Ray Job Dispatch and Tuning#
Isaac Lab supports Ray for streamlining dispatching multiple training jobs (in parallel and in series), and hyperparameter tuning, both on local and remote configurations.
This independent community contributed walkthrough video demonstrates some of the core functionality of the Ray integration covered in this overview. Although there may be some differences in the codebase (such as file names being shortened) since the creation of the video, the general workflow is the same.
Attention
This functionality is experimental, and has been tested only on Linux.
Overview#
The Ray integration is useful for the following.
Dispatching several training jobs in parallel or sequentially with minimal interaction.
Tuning hyperparameters; in parallel or sequentially with support for multiple GPUs and/or multiple GPU Nodes.
Using the same training setup everywhere (on cloud and local) with minimal overhead.
Resource Isolation for training jobs (resource-wrapped jobs).
The core functionality of the Ray workflow consists of two main scripts that enable the orchestration of resource-wrapped and tuning aggregate jobs. In resource-wrapped aggregate jobs, each sub-job and its resource requirements are defined manually, enabling resource isolation. For tuning aggregate jobs, individual jobs are generated automatically based on a hyperparameter sweep configuration.
Both resource-wrapped and tuning aggregate jobs dispatch individual jobs to a designated Ray cluster, which leverages the cluster’s resources (e.g., a single workstation node or multiple nodes) to execute these jobs with workers in parallel and/or sequentially.
By default, jobs use all available resources on each available GPU-enabled node for each sub-job worker. This can be changed through
specifying the --num_workers argument for resource-wrapped jobs, or --num_workers_per_node
for tuning jobs, which is especially critical for parallel aggregate
job processing on local/virtual multi-GPU machines. Tuning jobs assume homogeneous node resource composition for nodes with GPUs.
The two following files contain the core functionality of the Ray integration.
scripts/reinforcement_learning/ray/wrap_resources.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import ray
import util
from ray.util.scheduling_strategies import NodeAffinitySchedulingStrategy
"""
This script dispatches sub-job(s) (individual jobs, use :file:`tuner.py` for tuning jobs)
to worker(s) on GPU-enabled node(s) of a specific cluster as part of an resource-wrapped aggregate
job. If no desired compute resources for each sub-job are specified,
this script creates one worker per available node for each node with GPU(s) in the cluster.
If the desired resources for each sub-job is specified,
the maximum number of workers possible with the desired resources are created for each node
with GPU(s) in the cluster. It is also possible to split available node resources for each node
into the desired number of workers with the ``--num_workers`` flag, to be able to easily
parallelize sub-jobs on multi-GPU nodes. Due to Isaac Lab requiring a GPU,
this ignores all CPU only nodes such as loggers.
Sub-jobs are matched with node(s) in a cluster via the following relation:
sorted_nodes = Node sorted by descending GPUs, then descending CPUs, then descending RAM, then node ID
node_submitted_to = sorted_nodes[job_index % total_node_count]
To check the ordering of sorted nodes, supply the ``--test`` argument and run the script.
Sub-jobs are separated by the + delimiter. The ``--sub_jobs`` argument must be the last
argument supplied to the script.
If there is more than one available worker, and more than one sub-job,
sub-jobs will be executed in parallel. If there are more sub-jobs than workers, sub-jobs will
be dispatched to workers as they become available. There is no limit on the number
of sub-jobs that can be near-simultaneously submitted.
This script is meant to be executed on a Ray cluster head node as an aggregate cluster job.
To submit aggregate cluster jobs such as this script to one or more remote clusters,
see :file:`../submit_isaac_ray_job.py`.
KubeRay clusters on Google GKE can be created with :file:`../launch.py`
Usage:
.. code-block:: bash
# **Ensure that sub-jobs are separated by the ``+`` delimiter.**
# Generic Templates-----------------------------------
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py -h
# No resource isolation; no parallelization:
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py
--sub_jobs <JOB0>+<JOB1>+<JOB2>
# Automatic Resource Isolation; Example A: needed for parallelization
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py \
--num_workers <NUM_TO_DIVIDE_TOTAL_RESOURCES_BY> \
--sub_jobs <JOB0>+<JOB1>
# Manual Resource Isolation; Example B: needed for parallelization
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py --num_cpu_per_worker <CPU> \
--gpu_per_worker <GPU> --ram_gb_per_worker <RAM> --sub_jobs <JOB0>+<JOB1>
# Manual Resource Isolation; Example C: Needed for parallelization, for heterogeneous workloads
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py --num_cpu_per_worker <CPU> \
--gpu_per_worker <GPU1> <GPU2> --ram_gb_per_worker <RAM> --sub_jobs <JOB0>+<JOB1>
# to see all arguments
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py -h
"""
def wrap_resources_to_jobs(jobs: list[str], args: argparse.Namespace) -> None:
"""
Provided a list of jobs, dispatch jobs to one worker per available node,
unless otherwise specified by resource constraints.
Args:
jobs: bash commands to execute on a Ray cluster
args: The arguments for resource allocation
"""
if not ray.is_initialized():
ray.init(address=args.ray_address, log_to_driver=True)
job_results = []
gpu_node_resources = util.get_gpu_node_resources(include_id=True, include_gb_ram=True)
if any([args.gpu_per_worker, args.cpu_per_worker, args.ram_gb_per_worker]) and args.num_workers:
raise ValueError("Either specify only num_workers or only granular resources(GPU,CPU,RAM_GB).")
num_nodes = len(gpu_node_resources)
# Populate arguments
formatted_node_resources = {
"gpu_per_worker": [gpu_node_resources[i]["GPU"] for i in range(num_nodes)],
"cpu_per_worker": [gpu_node_resources[i]["CPU"] for i in range(num_nodes)],
"ram_gb_per_worker": [gpu_node_resources[i]["ram_gb"] for i in range(num_nodes)],
"num_workers": args.num_workers, # By default, 1 worker por node
}
args = util.fill_in_missing_resources(args, resources=formatted_node_resources, policy=min)
print(f"[INFO]: Number of GPU nodes found: {num_nodes}")
if args.test:
jobs = ["nvidia-smi"] * num_nodes
for i, job in enumerate(jobs):
gpu_node = gpu_node_resources[i % num_nodes]
print(f"[INFO]: Submitting job {i + 1} of {len(jobs)} with job '{job}' to node {gpu_node}")
print(
f"[INFO]: Resource parameters: GPU: {args.gpu_per_worker[i]}"
f" CPU: {args.cpu_per_worker[i]} RAM {args.ram_gb_per_worker[i]}"
)
print(f"[INFO] For the node parameters, creating {args.num_workers[i]} workers")
num_gpus = args.gpu_per_worker[i] / args.num_workers[i]
num_cpus = args.cpu_per_worker[i] / args.num_workers[i]
memory = (args.ram_gb_per_worker[i] * 1024**3) / args.num_workers[i]
print(f"[INFO]: Requesting {num_gpus=} {num_cpus=} {memory=} id={gpu_node['id']}")
job = util.remote_execute_job.options(
num_gpus=num_gpus,
num_cpus=num_cpus,
memory=memory,
scheduling_strategy=NodeAffinitySchedulingStrategy(gpu_node["id"], soft=False),
).remote(job, f"Job {i}", args.test)
job_results.append(job)
results = ray.get(job_results)
for i, result in enumerate(results):
print(f"[INFO]: Job {i} result: {result}")
print("[INFO]: All jobs completed.")
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Submit multiple jobs with optional GPU testing.")
parser = util.add_resource_arguments(arg_parser=parser)
parser.add_argument("--ray_address", type=str, default="auto", help="the Ray address.")
parser.add_argument(
"--test",
action="store_true",
help=(
"Run nvidia-smi test instead of the arbitrary job,"
"can use as a sanity check prior to any jobs to check "
"that GPU resources are correctly isolated."
),
)
parser.add_argument(
"--sub_jobs",
type=str,
nargs=argparse.REMAINDER,
help="This should be last wrapper argument. Jobs separated by the + delimiter to run on a cluster.",
)
args = parser.parse_args()
if args.sub_jobs is not None:
jobs = " ".join(args.sub_jobs)
formatted_jobs = jobs.split("+")
else:
formatted_jobs = []
print(f"[INFO]: Isaac Ray Wrapper received jobs {formatted_jobs=}")
wrap_resources_to_jobs(jobs=formatted_jobs, args=args)
scripts/reinforcement_learning/ray/tuner.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import importlib.util
import os
import sys
from time import sleep
import ray
import util
from ray import air, tune
from ray.tune.search.optuna import OptunaSearch
from ray.tune.search.repeater import Repeater
"""
This script breaks down an aggregate tuning job, as defined by a hyperparameter sweep configuration,
into individual jobs (shell commands) to run on the GPU-enabled nodes of the cluster.
By default, one worker is created for each GPU-enabled node in the cluster for each individual job.
To use more than one worker per node (likely the case for multi-GPU machines), supply the
num_workers_per_node argument.
Each hyperparameter sweep configuration should include the workflow,
runner arguments, and hydra arguments to vary.
This assumes that all workers in a cluster are homogeneous. For heterogeneous workloads,
create several heterogeneous clusters (with homogeneous nodes in each cluster),
then submit several overall-cluster jobs with :file:`../submit_job.py`.
KubeRay clusters on Google GKE can be created with :file:`../launch.py`
To report tune metrics on clusters, a running MLFlow server with a known URI that the cluster has
access to is required. For KubeRay clusters configured with :file:`../launch.py`, this is included
automatically, and can be easily found with with :file:`grok_cluster_with_kubectl.py`
Usage:
.. code-block:: bash
./isaaclab.sh -p scripts/reinforcement_learning/ray/tuner.py -h
# Examples
# Local
./isaaclab.sh -p scripts/reinforcement_learning/ray/tuner.py --run_mode local \
--cfg_file scripts/reinforcement_learning/ray/hyperparameter_tuning/vision_cartpole_cfg.py \
--cfg_class CartpoleTheiaJobCfg
# Remote (run grok cluster or create config file mentioned in :file:`submit_job.py`)
./isaaclab.sh -p scripts/reinforcement_learning/ray/submit_job.py \
--aggregate_jobs tuner.py \
--cfg_file hyperparameter_tuning/vision_cartpole_cfg.py \
--cfg_class CartpoleTheiaJobCfg --mlflow_uri <MLFLOW_URI_FROM_GROK_OR_MANUAL>
"""
DOCKER_PREFIX = "/workspace/isaaclab/"
BASE_DIR = os.path.expanduser("~")
PYTHON_EXEC = "./isaaclab.sh -p"
WORKFLOW = "scripts/reinforcement_learning/rl_games/train.py"
NUM_WORKERS_PER_NODE = 1 # needed for local parallelism
class IsaacLabTuneTrainable(tune.Trainable):
"""The Isaac Lab Ray Tune Trainable.
This class uses the standalone workflows to start jobs, along with the hydra integration.
This class achieves Ray-based logging through reading the tensorboard logs from
the standalone workflows. This depends on a config generated in the format of
:class:`JobCfg`
"""
def setup(self, config: dict) -> None:
"""Get the invocation command, return quick for easy scheduling."""
self.data = None
self.invoke_cmd = util.get_invocation_command_from_cfg(cfg=config, python_cmd=PYTHON_EXEC, workflow=WORKFLOW)
print(f"[INFO]: Recovered invocation with {self.invoke_cmd}")
self.experiment = None
def reset_config(self, new_config: dict):
"""Allow environments to be re-used by fetching a new invocation command"""
self.setup(new_config)
return True
def step(self) -> dict:
if self.experiment is None: # start experiment
# When including this as first step instead of setup, experiments get scheduled faster
# Don't want to block the scheduler while the experiment spins up
print(f"[INFO]: Invoking experiment as first step with {self.invoke_cmd}...")
experiment = util.execute_job(
self.invoke_cmd,
identifier_string="",
extract_experiment=True,
persistent_dir=BASE_DIR,
)
self.experiment = experiment
print(f"[INFO]: Tuner recovered experiment info {experiment}")
self.proc = experiment["proc"]
self.experiment_name = experiment["experiment_name"]
self.isaac_logdir = experiment["logdir"]
self.tensorboard_logdir = self.isaac_logdir + "/" + self.experiment_name
self.done = False
if self.proc is None:
raise ValueError("Could not start trial.")
proc_status = self.proc.poll()
if proc_status is not None: # process finished, signal finish
self.data["done"] = True
print(f"[INFO]: Process finished with {proc_status}, returning...")
else: # wait until the logs are ready or fresh
data = util.load_tensorboard_logs(self.tensorboard_logdir)
while data is None:
data = util.load_tensorboard_logs(self.tensorboard_logdir)
sleep(2) # Lazy report metrics to avoid performance overhead
if self.data is not None:
while util._dicts_equal(data, self.data):
data = util.load_tensorboard_logs(self.tensorboard_logdir)
sleep(2) # Lazy report metrics to avoid performance overhead
self.data = data
self.data["done"] = False
return self.data
def default_resource_request(self):
"""How many resources each trainable uses. Assumes homogeneous resources across gpu nodes,
and that each trainable is meant for one node, where it uses all available resources."""
resources = util.get_gpu_node_resources(one_node_only=True)
if NUM_WORKERS_PER_NODE != 1:
print("[WARNING]: Splitting node into more than one worker")
return tune.PlacementGroupFactory(
[{"CPU": resources["CPU"] / NUM_WORKERS_PER_NODE, "GPU": resources["GPU"] / NUM_WORKERS_PER_NODE}],
strategy="STRICT_PACK",
)
def invoke_tuning_run(cfg: dict, args: argparse.Namespace) -> None:
"""Invoke an Isaac-Ray tuning run.
Log either to a local directory or to MLFlow.
Args:
cfg: Configuration dictionary extracted from job setup
args: Command-line arguments related to tuning.
"""
# Allow for early exit
os.environ["TUNE_DISABLE_STRICT_METRIC_CHECKING"] = "1"
print("[WARNING]: Not saving checkpoints, just running experiment...")
print("[INFO]: Model parameters and metrics will be preserved.")
print("[WARNING]: For homogeneous cluster resources only...")
# Get available resources
resources = util.get_gpu_node_resources()
print(f"[INFO]: Available resources {resources}")
if not ray.is_initialized():
ray.init(
address=args.ray_address,
log_to_driver=True,
num_gpus=len(resources),
)
print(f"[INFO]: Using config {cfg}")
# Configure the search algorithm and the repeater
searcher = OptunaSearch(
metric=args.metric,
mode=args.mode,
)
repeat_search = Repeater(searcher, repeat=args.repeat_run_count)
if args.run_mode == "local": # Standard config, to file
run_config = air.RunConfig(
storage_path="/tmp/ray",
name=f"IsaacRay-{args.cfg_class}-tune",
verbose=1,
checkpoint_config=air.CheckpointConfig(
checkpoint_frequency=0, # Disable periodic checkpointing
checkpoint_at_end=False, # Disable final checkpoint
),
)
elif args.run_mode == "remote": # MLFlow, to MLFlow server
mlflow_callback = MLflowLoggerCallback(
tracking_uri=args.mlflow_uri,
experiment_name=f"IsaacRay-{args.cfg_class}-tune",
save_artifact=False,
tags={"run_mode": "remote", "cfg_class": args.cfg_class},
)
run_config = ray.train.RunConfig(
name="mlflow",
storage_path="/tmp/ray",
callbacks=[mlflow_callback],
checkpoint_config=ray.train.CheckpointConfig(checkpoint_frequency=0, checkpoint_at_end=False),
)
else:
raise ValueError("Unrecognized run mode.")
# Configure the tuning job
tuner = tune.Tuner(
IsaacLabTuneTrainable,
param_space=cfg,
tune_config=tune.TuneConfig(
search_alg=repeat_search,
num_samples=args.num_samples,
reuse_actors=True,
),
run_config=run_config,
)
# Execute the tuning
tuner.fit()
# Save results to mounted volume
if args.run_mode == "local":
print("[DONE!]: Check results with tensorboard dashboard")
else:
print("[DONE!]: Check results with MLFlow dashboard")
class JobCfg:
"""To be compatible with :meth: invoke_tuning_run and :class:IsaacLabTuneTrainable,
at a minimum, the tune job should inherit from this class."""
def __init__(self, cfg: dict):
"""
Runner args include command line arguments passed to the task.
For example:
cfg["runner_args"]["headless_singleton"] = "--headless"
cfg["runner_args"]["enable_cameras_singleton"] = "--enable_cameras"
"""
assert "runner_args" in cfg, "No runner arguments specified."
"""
Task is the desired task to train on. For example:
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-TheiaTiny-v0"])
"""
assert "--task" in cfg["runner_args"], "No task specified."
"""
Hydra args define the hyperparameters varied within the sweep. For example:
cfg["hydra_args"]["agent.params.network.cnn.activation"] = tune.choice(["relu", "elu"])
"""
assert "hydra_args" in cfg, "No hyperparameters specified."
self.cfg = cfg
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Tune Isaac Lab hyperparameters.")
parser.add_argument("--ray_address", type=str, default="auto", help="the Ray address.")
parser.add_argument(
"--cfg_file",
type=str,
default="hyperparameter_tuning/vision_cartpole_cfg.py",
required=False,
help="The relative filepath where a hyperparameter sweep is defined",
)
parser.add_argument(
"--cfg_class",
type=str,
default="CartpoleRGBNoTuneJobCfg",
required=False,
help="Name of the hyperparameter sweep class to use",
)
parser.add_argument(
"--run_mode",
choices=["local", "remote"],
default="remote",
help=(
"Set to local to use ./isaaclab.sh -p python, set to "
"remote to use /workspace/isaaclab/isaaclab.sh -p python"
),
)
parser.add_argument(
"--workflow",
default=None, # populated with RL Games
help="The absolute path of the workflow to use for the experiment. By default, RL Games is used.",
)
parser.add_argument(
"--mlflow_uri",
type=str,
default=None,
required=False,
help="The MLFlow Uri.",
)
parser.add_argument(
"--num_workers_per_node",
type=int,
default=1,
help="Number of workers to run on each GPU node. Only supply for parallelism on multi-gpu nodes",
)
parser.add_argument("--metric", type=str, default="rewards/time", help="What metric to tune for.")
parser.add_argument(
"--mode",
choices=["max", "min"],
default="max",
help="What to optimize the metric to while tuning",
)
parser.add_argument(
"--num_samples",
type=int,
default=100,
help="How many hyperparameter runs to try total.",
)
parser.add_argument(
"--repeat_run_count",
type=int,
default=3,
help="How many times to repeat each hyperparameter config.",
)
args = parser.parse_args()
NUM_WORKERS_PER_NODE = args.num_workers_per_node
print(f"[INFO]: Using {NUM_WORKERS_PER_NODE} workers per node.")
if args.run_mode == "remote":
BASE_DIR = DOCKER_PREFIX # ensure logs are dumped to persistent location
PYTHON_EXEC = DOCKER_PREFIX + PYTHON_EXEC[2:]
if args.workflow is None:
WORKFLOW = DOCKER_PREFIX + WORKFLOW
else:
WORKFLOW = args.workflow
print(f"[INFO]: Using remote mode {PYTHON_EXEC=} {WORKFLOW=}")
if args.mlflow_uri is not None:
import mlflow
mlflow.set_tracking_uri(args.mlflow_uri)
from ray.air.integrations.mlflow import MLflowLoggerCallback
else:
raise ValueError("Please provide a result MLFLow URI server.")
else: # local
PYTHON_EXEC = os.getcwd() + "/" + PYTHON_EXEC[2:]
if args.workflow is None:
WORKFLOW = os.getcwd() + "/" + WORKFLOW
else:
WORKFLOW = args.workflow
BASE_DIR = os.getcwd()
print(f"[INFO]: Using local mode {PYTHON_EXEC=} {WORKFLOW=}")
file_path = args.cfg_file
class_name = args.cfg_class
print(f"[INFO]: Attempting to use sweep config from {file_path=} {class_name=}")
module_name = os.path.splitext(os.path.basename(file_path))[0]
spec = importlib.util.spec_from_file_location(module_name, file_path)
module = importlib.util.module_from_spec(spec)
sys.modules[module_name] = module
spec.loader.exec_module(module)
print(f"[INFO]: Successfully imported {module_name} from {file_path}")
if hasattr(module, class_name):
ClassToInstantiate = getattr(module, class_name)
print(f"[INFO]: Found correct class {ClassToInstantiate}")
instance = ClassToInstantiate()
print(f"[INFO]: Successfully instantiated class '{class_name}' from {file_path}")
cfg = instance.cfg
print(f"[INFO]: Grabbed the following hyperparameter sweep config: \n {cfg}")
invoke_tuning_run(cfg, args)
else:
raise AttributeError(f"[ERROR]:Class '{class_name}' not found in {file_path}")
The following script can be used to submit aggregate jobs to one or more Ray cluster(s), which can be used for running jobs on a remote cluster or simultaneous jobs with heterogeneous resource requirements.
scripts/reinforcement_learning/ray/submit_job.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import os
import time
from concurrent.futures import ThreadPoolExecutor
from ray import job_submission
"""
This script submits aggregate job(s) to cluster(s) described in a
config file containing ``name: <NAME> address: http://<IP>:<PORT>`` on
a new line for each cluster. For KubeRay clusters, this file
can be automatically created with :file:`grok_cluster_with_kubectl.py`
Aggregate job(s) are matched with cluster(s) via the following relation:
cluster_line_index_submitted_to = job_index % total_cluster_count
Aggregate jobs are separated by the * delimiter. The ``--aggregate_jobs`` argument must be
the last argument supplied to the script.
An aggregate job could be a :file:`../tuner.py` tuning job, which automatically
creates several individual jobs when started on a cluster. Alternatively, an aggregate job
could be a :file:'../wrap_resources.py` resource-wrapped job,
which may contain several individual sub-jobs separated by
the + delimiter.
If there are more aggregate jobs than cluster(s), aggregate jobs will be submitted
as clusters become available via the defined relation above. If there are less aggregate job(s)
than clusters, some clusters will not receive aggregate job(s). The maximum number of
aggregate jobs that can be run simultaneously is equal to the number of workers created by
default by a ThreadPoolExecutor on the machine submitting jobs due to fetching the log output after
jobs finish, which is unlikely to constrain overall-job submission.
Usage:
.. code-block:: bash
# Example; submitting a tuning job
python3 scripts/reinforcement_learning/ray/submit_job.py \
--aggregate_jobs /workspace/isaaclab/scripts/reinforcement_learning/ray/tuner.py \
--cfg_file hyperparameter_tuning/vision_cartpole_cfg.py \
--cfg_class CartpoleTheiaJobCfg --mlflow_uri <ML_FLOW_URI>
# Example: Submitting resource wrapped job
python3 scripts/reinforcement_learning/ray/submit_job.py --aggregate_jobs wrap_resources.py --test
# For all command line arguments
python3 scripts/reinforcement_learning/ray/submit_job.py -h
"""
script_directory = os.path.dirname(os.path.abspath(__file__))
CONFIG = {"working_dir": script_directory, "executable": "/workspace/isaaclab/isaaclab.sh -p"}
def read_cluster_spec(fn: str | None = None) -> list[dict]:
if fn is None:
cluster_spec_path = os.path.expanduser("~/.cluster_config")
else:
cluster_spec_path = os.path.expanduser(fn)
if not os.path.exists(cluster_spec_path):
raise FileNotFoundError(f"Cluster spec file not found at {cluster_spec_path}")
clusters = []
with open(cluster_spec_path) as f:
for line in f:
parts = line.strip().split(" ")
http_address = parts[3]
cluster_info = {"name": parts[1], "address": http_address}
print(f"[INFO] Setting {cluster_info['name']}") # with {cluster_info['num_gpu']} GPUs.")
clusters.append(cluster_info)
return clusters
def submit_job(cluster: dict, job_command: str) -> None:
"""
Submits a job to a single cluster, prints the final result and Ray dashboard URL at the end.
"""
address = cluster["address"]
cluster_name = cluster["name"]
print(f"[INFO]: Submitting job to cluster '{cluster_name}' at {address}") # with {num_gpus} GPUs.")
client = job_submission.JobSubmissionClient(address)
runtime_env = {"working_dir": CONFIG["working_dir"], "executable": CONFIG["executable"]}
print(f"[INFO]: Checking contents of the directory: {CONFIG['working_dir']}")
try:
dir_contents = os.listdir(CONFIG["working_dir"])
print(f"[INFO]: Directory contents: {dir_contents}")
except Exception as e:
print(f"[INFO]: Failed to list directory contents: {str(e)}")
entrypoint = f"{CONFIG['executable']} {job_command}"
print(f"[INFO]: Attempting entrypoint {entrypoint=} in cluster {cluster}")
job_id = client.submit_job(entrypoint=entrypoint, runtime_env=runtime_env)
status = client.get_job_status(job_id)
while status in [job_submission.JobStatus.PENDING, job_submission.JobStatus.RUNNING]:
time.sleep(5)
status = client.get_job_status(job_id)
final_logs = client.get_job_logs(job_id)
print("----------------------------------------------------")
print(f"[INFO]: Cluster {cluster_name} Logs: \n")
print(final_logs)
print("----------------------------------------------------")
def submit_jobs_to_clusters(jobs: list[str], clusters: list[dict]) -> None:
"""
Submit all jobs to their respective clusters, cycling through clusters if there are more jobs than clusters.
"""
if not clusters:
raise ValueError("No clusters available for job submission.")
if len(jobs) < len(clusters):
print("[INFO]: Less jobs than clusters, some clusters will not receive jobs")
elif len(jobs) == len(clusters):
print("[INFO]: Exactly one job per cluster")
else:
print("[INFO]: More jobs than clusters, jobs submitted as clusters become available.")
with ThreadPoolExecutor() as executor:
for idx, job_command in enumerate(jobs):
# Cycle through clusters using modulus to wrap around if there are more jobs than clusters
cluster = clusters[idx % len(clusters)]
executor.submit(submit_job, cluster, job_command)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Submit multiple GPU jobs to multiple Ray clusters.")
parser.add_argument("--config_file", default="~/.cluster_config", help="The cluster config path.")
parser.add_argument(
"--aggregate_jobs",
type=str,
nargs=argparse.REMAINDER,
help="This should be last argument. The aggregate jobs to submit separated by the * delimiter.",
)
args = parser.parse_args()
if args.aggregate_jobs is not None:
jobs = " ".join(args.aggregate_jobs)
formatted_jobs = jobs.split("*")
if len(formatted_jobs) > 1:
print("Warning; Split jobs by cluster with the * delimiter")
else:
formatted_jobs = []
print(f"[INFO]: Isaac Ray Wrapper received jobs {formatted_jobs=}")
clusters = read_cluster_spec(args.config_file)
submit_jobs_to_clusters(formatted_jobs, clusters)
The following script can be used to extract KubeRay cluster information for aggregate job submission.
scripts/reinforcement_learning/ray/grok_cluster_with_kubectl.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import os
import re
import subprocess
import threading
import time
from concurrent.futures import ThreadPoolExecutor, as_completed
"""
This script requires that kubectl is installed and KubeRay was used to create the cluster.
Creates a config file containing ``name: <NAME> address: http://<IP>:<PORT>`` on
a new line for each cluster, and also fetches the MLFlow URI.
Usage:
.. code-block:: bash
python3 scripts/reinforcement_learning/ray/grok_cluster_with_kubectl.py
# For options, supply -h arg
"""
def get_namespace() -> str:
"""Get the current Kubernetes namespace from the context, fallback to default if not set"""
try:
namespace = (
subprocess.check_output(["kubectl", "config", "view", "--minify", "--output", "jsonpath={..namespace}"])
.decode()
.strip()
)
if not namespace:
namespace = "default"
except subprocess.CalledProcessError:
namespace = "default"
return namespace
def get_pods(namespace: str = "default") -> list[tuple]:
"""Get a list of all of the pods in the namespace"""
cmd = ["kubectl", "get", "pods", "-n", namespace, "--no-headers"]
output = subprocess.check_output(cmd).decode()
pods = []
for line in output.strip().split("\n"):
fields = line.split()
pod_name = fields[0]
status = fields[2]
pods.append((pod_name, status))
return pods
def get_clusters(pods: list, cluster_name_prefix: str) -> set:
"""
Get unique cluster name(s). Works for one or more clusters, based off of the number of head nodes.
Excludes MLflow deployments.
"""
clusters = set()
for pod_name, _ in pods:
# Skip MLflow pods
if "-mlflow" in pod_name:
continue
match = re.match(r"(" + re.escape(cluster_name_prefix) + r"[-\w]+)", pod_name)
if match:
# Get base name without head/worker suffix (skip workers)
if "head" in pod_name:
base_name = match.group(1).split("-head")[0]
clusters.add(base_name)
return sorted(clusters)
def get_mlflow_info(namespace: str = None, cluster_prefix: str = "isaacray") -> str:
"""
Get MLflow service information if it exists in the namespace with the given prefix.
Only works for a single cluster instance.
Args:
namespace: Kubernetes namespace
cluster_prefix: Base cluster name (without -head/-worker suffixes)
Returns:
MLflow service URL
"""
# Strip any -head or -worker suffixes to get base name
if namespace is None:
namespace = get_namespace()
pods = get_pods(namespace=namespace)
clusters = get_clusters(pods=pods, cluster_name_prefix=cluster_prefix)
if len(clusters) > 1:
raise ValueError("More than one cluster matches prefix, could not automatically determine mlflow info.")
mlflow_name = f"{cluster_prefix}-mlflow"
cmd = ["kubectl", "get", "svc", mlflow_name, "-n", namespace, "--no-headers"]
try:
output = subprocess.check_output(cmd).decode()
fields = output.strip().split()
# Get cluster IP
cluster_ip = fields[2]
port = "5000" # Default MLflow port
# This needs to be http to be resolved. HTTPS can't be resolved
# This should be fine as it is on a subnet on the cluster regardless
return f"http://{cluster_ip}:{port}"
except subprocess.CalledProcessError as e:
raise ValueError(f"Could not grok MLflow: {e}") # Fixed f-string
def check_clusters_running(pods: list, clusters: set) -> bool:
"""
Check that all of the pods in all provided clusters are running.
Args:
pods (list): A list of tuples where each tuple contains the pod name and its status.
clusters (set): A set of cluster names to check.
Returns:
bool: True if all pods in any of the clusters are running, False otherwise.
"""
clusters_running = False
for cluster in clusters:
cluster_pods = [p for p in pods if p[0].startswith(cluster)]
total_pods = len(cluster_pods)
running_pods = len([p for p in cluster_pods if p[1] == "Running"])
if running_pods == total_pods and running_pods > 0:
clusters_running = True
break
return clusters_running
def get_ray_address(head_pod: str, namespace: str = "default", ray_head_name: str = "head") -> str:
"""
Given a cluster head pod, check its logs, which should include the ray address which can accept job requests.
Args:
head_pod (str): The name of the head pod.
namespace (str, optional): The Kubernetes namespace. Defaults to "default".
ray_head_name (str, optional): The name of the ray head container. Defaults to "head".
Returns:
str: The ray address if found, None otherwise.
Raises:
ValueError: If the logs cannot be retrieved or the ray address is not found.
"""
cmd = ["kubectl", "logs", head_pod, "-c", ray_head_name, "-n", namespace]
try:
output = subprocess.check_output(cmd).decode()
except subprocess.CalledProcessError as e:
raise ValueError(
f"Could not enter head container with cmd {cmd}: {e}Perhaps try a different namespace or ray head name."
)
match = re.search(r"RAY_ADDRESS='([^']+)'", output)
if match:
return match.group(1)
else:
return None
def process_cluster(cluster_info: dict, ray_head_name: str = "head") -> str:
"""
For each cluster, check that it is running, and get the Ray head address that will accept jobs.
Args:
cluster_info (dict): A dictionary containing cluster information with keys 'cluster', 'pods', and 'namespace'.
ray_head_name (str, optional): The name of the ray head container. Defaults to "head".
Returns:
str: A string containing the cluster name and its Ray head address, or an error message if the head pod or Ray address is not found.
"""
cluster, pods, namespace = cluster_info
head_pod = None
for pod_name, status in pods:
if pod_name.startswith(cluster + "-head"):
head_pod = pod_name
break
if not head_pod:
return f"Error: Could not find head pod for cluster {cluster}\n"
# Get RAY_ADDRESS and status
ray_address = get_ray_address(head_pod, namespace=namespace, ray_head_name=ray_head_name)
if not ray_address:
return f"Error: Could not find RAY_ADDRESS for cluster {cluster}\n"
# Return only cluster and ray address
return f"name: {cluster} address: {ray_address}\n"
def main():
# Parse command-line arguments
parser = argparse.ArgumentParser(description="Process Ray clusters and save their specifications.")
parser.add_argument("--prefix", default="isaacray", help="The prefix for the cluster names.")
parser.add_argument("--output", default="~/.cluster_config", help="The file to save cluster specifications.")
parser.add_argument("--ray_head_name", default="head", help="The metadata name for the ray head container")
parser.add_argument(
"--namespace", help="Kubernetes namespace to use. If not provided, will detect from current context."
)
args = parser.parse_args()
# Get namespace from args or detect it
current_namespace = args.namespace if args.namespace else get_namespace()
print(f"Using namespace: {current_namespace}")
cluster_name_prefix = args.prefix
cluster_spec_file = os.path.expanduser(args.output)
# Get all pods
pods = get_pods(namespace=current_namespace)
# Get clusters
clusters = get_clusters(pods, cluster_name_prefix)
if not clusters:
print(f"No clusters found with prefix {cluster_name_prefix}")
return
# Wait for clusters to be running
while True:
pods = get_pods(namespace=current_namespace)
if check_clusters_running(pods, clusters):
break
print("Waiting for all clusters to spin up...")
time.sleep(5)
print("Checking for MLflow:")
# Check MLflow status for each cluster
for cluster in clusters:
try:
mlflow_address = get_mlflow_info(current_namespace, cluster)
print(f"MLflow address for {cluster}: {mlflow_address}")
except ValueError as e:
print(f"ML Flow not located: {e}")
print()
# Prepare cluster info for parallel processing
cluster_infos = []
for cluster in clusters:
cluster_pods = [p for p in pods if p[0].startswith(cluster)]
cluster_infos.append((cluster, cluster_pods, current_namespace))
# Use ThreadPoolExecutor to process clusters in parallel
results = []
results_lock = threading.Lock()
with ThreadPoolExecutor() as executor:
future_to_cluster = {
executor.submit(process_cluster, info, args.ray_head_name): info[0] for info in cluster_infos
}
for future in as_completed(future_to_cluster):
cluster_name = future_to_cluster[future]
try:
result = future.result()
with results_lock:
results.append(result)
except Exception as exc:
print(f"{cluster_name} generated an exception: {exc}")
# Sort results alphabetically by cluster name
results.sort()
# Write sorted results to the output file (Ray info only)
with open(cluster_spec_file, "w") as f:
for result in results:
f.write(result)
print(f"Cluster spec information saved to {cluster_spec_file}")
# Display the contents of the config file
with open(cluster_spec_file) as f:
print(f.read())
if __name__ == "__main__":
main()
The following script can be used to easily create clusters on Google GKE.
scripts/reinforcement_learning/ray/launch.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import pathlib
import subprocess
import yaml
import util
from jinja2 import Environment, FileSystemLoader
from kubernetes import config
"""This script helps create one or more KubeRay clusters.
Usage:
.. code-block:: bash
# If the head node is stuck on container creating, make sure to create a secret
python3 scripts/reinforcement_learning/ray/launch.py -h
# Examples
# The following creates 8 GPUx1 nvidia l4 workers
python3 scripts/reinforcement_learning/ray/launch.py --cluster_host google_cloud \
--namespace <NAMESPACE> --image <YOUR_ISAAC_RAY_IMAGE> \
--num_workers 8 --num_clusters 1 --worker_accelerator nvidia-l4 --gpu_per_worker 1
# The following creates 1 GPUx1 nvidia l4 worker, 2 GPUx2 nvidia-tesla-t4 workers,
# and 2 GPUx4 nvidia-tesla-t4 GPU workers
python3 scripts/reinforcement_learning/ray/launch.py --cluster_host google_cloud \
--namespace <NAMESPACE> --image <YOUR_ISAAC_RAY_IMAGE> \
--num_workers 1 2 --num_clusters 1 \
--worker_accelerator nvidia-l4 nvidia-tesla-t4 --gpu_per_worker 1 2 4
"""
RAY_DIR = pathlib.Path(__file__).parent
def apply_manifest(args: argparse.Namespace) -> None:
"""Provided a Jinja templated ray.io/v1alpha1 file,
populate the arguments and create the cluster. Additionally, create
kubernetes containers for resources separated by '---' from the rest
of the file.
Args:
args: Possible arguments concerning cluster parameters.
"""
# Load Kubernetes configuration
config.load_kube_config()
# Set up Jinja2 environment for loading templates
templates_dir = RAY_DIR / "cluster_configs" / args.cluster_host
file_loader = FileSystemLoader(str(templates_dir))
jinja_env = Environment(loader=file_loader, keep_trailing_newline=True, autoescape=True)
# Define template filename
template_file = "kuberay.yaml.jinja"
# Convert args namespace to a dictionary
template_params = vars(args)
# Load and render the template
template = jinja_env.get_template(template_file)
file_contents = template.render(template_params)
# Parse all YAML documents in the rendered template
all_yamls = []
for doc in yaml.safe_load_all(file_contents):
all_yamls.append(doc)
# Convert back to YAML string, preserving multiple documents
cleaned_yaml_string = ""
for i, doc in enumerate(all_yamls):
if i > 0:
cleaned_yaml_string += "\n---\n"
cleaned_yaml_string += yaml.dump(doc)
# Apply the Kubernetes manifest using kubectl
try:
print(cleaned_yaml_string)
subprocess.run(["kubectl", "apply", "-f", "-"], input=cleaned_yaml_string, text=True, check=True)
except subprocess.CalledProcessError as e:
exit(f"An error occurred while running `kubectl`: {e}")
def parse_args() -> argparse.Namespace:
"""
Parse command-line arguments for Kubernetes deployment script.
Returns:
argparse.Namespace: Parsed command-line arguments.
"""
arg_parser = argparse.ArgumentParser(
description="Script to apply manifests to create Kubernetes objects for Ray clusters.",
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
arg_parser.add_argument(
"--cluster_host",
type=str,
default="google_cloud",
choices=["google_cloud"],
help=(
"In the cluster_configs directory, the name of the folder where a tune.yaml.jinja"
"file exists defining the KubeRay config. Currently only google_cloud is supported."
),
)
arg_parser.add_argument(
"--name",
type=str,
required=False,
default="isaacray",
help="Name of the Kubernetes deployment.",
)
arg_parser.add_argument(
"--namespace",
type=str,
required=False,
default="default",
help="Kubernetes namespace to deploy the Ray cluster.",
)
arg_parser.add_argument(
"--service_acount_name", type=str, required=False, default="default", help="The service account name to use."
)
arg_parser.add_argument(
"--image",
type=str,
required=True,
help="Docker image for the Ray cluster pods.",
)
arg_parser.add_argument(
"--worker_accelerator",
nargs="+",
type=str,
default=["nvidia-l4"],
help="GPU accelerator name. Supply more than one for heterogeneous resources.",
)
arg_parser = util.add_resource_arguments(arg_parser, cluster_create_defaults=True)
arg_parser.add_argument(
"--num_clusters",
type=int,
default=1,
help="How many Ray Clusters to create.",
)
arg_parser.add_argument(
"--num_head_cpu",
type=float, # to be able to schedule partial CPU heads
default=8,
help="The number of CPUs to give the Ray head.",
)
arg_parser.add_argument("--head_ram_gb", type=int, default=8, help="How many gigs of ram to give the Ray head")
args = arg_parser.parse_args()
return util.fill_in_missing_resources(args, cluster_creation_flag=True)
def main():
args = parse_args()
if "head" in args.name:
raise ValueError("For compatibility with other scripts, do not include head in the name")
if args.num_clusters == 1:
apply_manifest(args)
else:
default_name = args.name
for i in range(args.num_clusters):
args.name = default_name + "-" + str(i)
apply_manifest(args)
if __name__ == "__main__":
main()
Docker-based Local Quickstart#
First, follow the Docker Guide to set up the NVIDIA Container Toolkit and Docker Compose.
Then, run the following steps to start a tuning run.
# Build the base image, but we don't need to run it
python3 docker/container.py start && python3 docker/container.py stop
# Build the tuning image with extra deps
docker build -t isaacray -f scripts/reinforcement_learning/ray/cluster_configs/Dockerfile .
# Start the tuning image - symlink so that changes in the source folder show up in the container
docker run -v $(pwd)/source:/workspace/isaaclab/source -it --gpus all --net=host --entrypoint /bin/bash isaacray
# Start the Ray server within the tuning image
echo "import ray; ray.init(); import time; [time.sleep(10) for _ in iter(int, 1)]" | ./isaaclab.sh -p
In a different terminal, run the following.
# In a new terminal (don't close the above) , enter the image with a new shell.
docker container ps
docker exec -it <ISAAC_RAY_IMAGE_ID_FROM_CONTAINER_PS> /bin/bash
# Start a tuning run, with one parallel worker per GPU
./isaaclab.sh -p scripts/reinforcement_learning/ray/tuner.py \
--cfg_file scripts/reinforcement_learning/ray/hyperparameter_tuning/vision_cartpole_cfg.py \
--cfg_class CartpoleTheiaJobCfg \
--run_mode local \
--workflow scripts/reinforcement_learning/rl_games/train.py \
--num_workers_per_node <NUMBER_OF_GPUS_IN_COMPUTER>
To view the training logs, in a different terminal, run the following and visit localhost:6006 in a browser afterwards.
# In a new terminal (don't close the above) , enter the image with a new shell.
docker container ps
docker exec -it <ISAAC_RAY_IMAGE_ID_FROM_CONTAINER_PS> /bin/bash
# Start a tuning run, with one parallel worker per GPU
tensorboard --logdir=.
Submitting resource-wrapped individual jobs instead of automatic tuning runs is described in the following file.
scripts/reinforcement_learning/ray/wrap_resources.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import ray
import util
from ray.util.scheduling_strategies import NodeAffinitySchedulingStrategy
"""
This script dispatches sub-job(s) (individual jobs, use :file:`tuner.py` for tuning jobs)
to worker(s) on GPU-enabled node(s) of a specific cluster as part of an resource-wrapped aggregate
job. If no desired compute resources for each sub-job are specified,
this script creates one worker per available node for each node with GPU(s) in the cluster.
If the desired resources for each sub-job is specified,
the maximum number of workers possible with the desired resources are created for each node
with GPU(s) in the cluster. It is also possible to split available node resources for each node
into the desired number of workers with the ``--num_workers`` flag, to be able to easily
parallelize sub-jobs on multi-GPU nodes. Due to Isaac Lab requiring a GPU,
this ignores all CPU only nodes such as loggers.
Sub-jobs are matched with node(s) in a cluster via the following relation:
sorted_nodes = Node sorted by descending GPUs, then descending CPUs, then descending RAM, then node ID
node_submitted_to = sorted_nodes[job_index % total_node_count]
To check the ordering of sorted nodes, supply the ``--test`` argument and run the script.
Sub-jobs are separated by the + delimiter. The ``--sub_jobs`` argument must be the last
argument supplied to the script.
If there is more than one available worker, and more than one sub-job,
sub-jobs will be executed in parallel. If there are more sub-jobs than workers, sub-jobs will
be dispatched to workers as they become available. There is no limit on the number
of sub-jobs that can be near-simultaneously submitted.
This script is meant to be executed on a Ray cluster head node as an aggregate cluster job.
To submit aggregate cluster jobs such as this script to one or more remote clusters,
see :file:`../submit_isaac_ray_job.py`.
KubeRay clusters on Google GKE can be created with :file:`../launch.py`
Usage:
.. code-block:: bash
# **Ensure that sub-jobs are separated by the ``+`` delimiter.**
# Generic Templates-----------------------------------
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py -h
# No resource isolation; no parallelization:
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py
--sub_jobs <JOB0>+<JOB1>+<JOB2>
# Automatic Resource Isolation; Example A: needed for parallelization
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py \
--num_workers <NUM_TO_DIVIDE_TOTAL_RESOURCES_BY> \
--sub_jobs <JOB0>+<JOB1>
# Manual Resource Isolation; Example B: needed for parallelization
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py --num_cpu_per_worker <CPU> \
--gpu_per_worker <GPU> --ram_gb_per_worker <RAM> --sub_jobs <JOB0>+<JOB1>
# Manual Resource Isolation; Example C: Needed for parallelization, for heterogeneous workloads
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py --num_cpu_per_worker <CPU> \
--gpu_per_worker <GPU1> <GPU2> --ram_gb_per_worker <RAM> --sub_jobs <JOB0>+<JOB1>
# to see all arguments
./isaaclab.sh -p scripts/reinforcement_learning/ray/wrap_resources.py -h
"""
def wrap_resources_to_jobs(jobs: list[str], args: argparse.Namespace) -> None:
"""
Provided a list of jobs, dispatch jobs to one worker per available node,
unless otherwise specified by resource constraints.
Args:
jobs: bash commands to execute on a Ray cluster
args: The arguments for resource allocation
"""
if not ray.is_initialized():
ray.init(address=args.ray_address, log_to_driver=True)
job_results = []
gpu_node_resources = util.get_gpu_node_resources(include_id=True, include_gb_ram=True)
if any([args.gpu_per_worker, args.cpu_per_worker, args.ram_gb_per_worker]) and args.num_workers:
raise ValueError("Either specify only num_workers or only granular resources(GPU,CPU,RAM_GB).")
num_nodes = len(gpu_node_resources)
# Populate arguments
formatted_node_resources = {
"gpu_per_worker": [gpu_node_resources[i]["GPU"] for i in range(num_nodes)],
"cpu_per_worker": [gpu_node_resources[i]["CPU"] for i in range(num_nodes)],
"ram_gb_per_worker": [gpu_node_resources[i]["ram_gb"] for i in range(num_nodes)],
"num_workers": args.num_workers, # By default, 1 worker por node
}
args = util.fill_in_missing_resources(args, resources=formatted_node_resources, policy=min)
print(f"[INFO]: Number of GPU nodes found: {num_nodes}")
if args.test:
jobs = ["nvidia-smi"] * num_nodes
for i, job in enumerate(jobs):
gpu_node = gpu_node_resources[i % num_nodes]
print(f"[INFO]: Submitting job {i + 1} of {len(jobs)} with job '{job}' to node {gpu_node}")
print(
f"[INFO]: Resource parameters: GPU: {args.gpu_per_worker[i]}"
f" CPU: {args.cpu_per_worker[i]} RAM {args.ram_gb_per_worker[i]}"
)
print(f"[INFO] For the node parameters, creating {args.num_workers[i]} workers")
num_gpus = args.gpu_per_worker[i] / args.num_workers[i]
num_cpus = args.cpu_per_worker[i] / args.num_workers[i]
memory = (args.ram_gb_per_worker[i] * 1024**3) / args.num_workers[i]
print(f"[INFO]: Requesting {num_gpus=} {num_cpus=} {memory=} id={gpu_node['id']}")
job = util.remote_execute_job.options(
num_gpus=num_gpus,
num_cpus=num_cpus,
memory=memory,
scheduling_strategy=NodeAffinitySchedulingStrategy(gpu_node["id"], soft=False),
).remote(job, f"Job {i}", args.test)
job_results.append(job)
results = ray.get(job_results)
for i, result in enumerate(results):
print(f"[INFO]: Job {i} result: {result}")
print("[INFO]: All jobs completed.")
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Submit multiple jobs with optional GPU testing.")
parser = util.add_resource_arguments(arg_parser=parser)
parser.add_argument("--ray_address", type=str, default="auto", help="the Ray address.")
parser.add_argument(
"--test",
action="store_true",
help=(
"Run nvidia-smi test instead of the arbitrary job,"
"can use as a sanity check prior to any jobs to check "
"that GPU resources are correctly isolated."
),
)
parser.add_argument(
"--sub_jobs",
type=str,
nargs=argparse.REMAINDER,
help="This should be last wrapper argument. Jobs separated by the + delimiter to run on a cluster.",
)
args = parser.parse_args()
if args.sub_jobs is not None:
jobs = " ".join(args.sub_jobs)
formatted_jobs = jobs.split("+")
else:
formatted_jobs = []
print(f"[INFO]: Isaac Ray Wrapper received jobs {formatted_jobs=}")
wrap_resources_to_jobs(jobs=formatted_jobs, args=args)
Transferring files from the running container can be done as follows.
docker container ps
docker cp <ISAAC_RAY_IMAGE_ID_FROM_CONTAINER_PS>:</path/in/container/file> </path/on/host/>
For tuning jobs, specify the tuning job / hyperparameter sweep as child class of JobCfg .
The included JobCfg only supports the rl_games workflow due to differences in
environment entrypoints and hydra arguments, although other workflows will work if provided a compatible
JobCfg.
scripts/reinforcement_learning/ray/tuner.py (JobCfg definition)
class JobCfg:
"""To be compatible with :meth: invoke_tuning_run and :class:IsaacLabTuneTrainable,
at a minimum, the tune job should inherit from this class."""
def __init__(self, cfg: dict):
"""
Runner args include command line arguments passed to the task.
For example:
cfg["runner_args"]["headless_singleton"] = "--headless"
cfg["runner_args"]["enable_cameras_singleton"] = "--enable_cameras"
"""
assert "runner_args" in cfg, "No runner arguments specified."
"""
Task is the desired task to train on. For example:
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-TheiaTiny-v0"])
"""
assert "--task" in cfg["runner_args"], "No task specified."
"""
Hydra args define the hyperparameters varied within the sweep. For example:
cfg["hydra_args"]["agent.params.network.cnn.activation"] = tune.choice(["relu", "elu"])
"""
assert "hydra_args" in cfg, "No hyperparameters specified."
self.cfg = cfg
For example, see the following Cartpole Example configurations.
scripts/reinforcement_learning/ray/hyperparameter_tuning/vision_cartpole_cfg.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import pathlib
import sys
# Allow for import of items from the ray workflow.
CUR_DIR = pathlib.Path(__file__).parent
UTIL_DIR = CUR_DIR.parent
sys.path.extend([str(UTIL_DIR), str(CUR_DIR)])
import util
import vision_cfg
from ray import tune
class CartpoleRGBNoTuneJobCfg(vision_cfg.CameraJobCfg):
def __init__(self, cfg: dict = {}):
cfg = util.populate_isaac_ray_cfg_args(cfg)
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-v0"])
super().__init__(cfg, vary_env_count=False, vary_cnn=False, vary_mlp=False)
class CartpoleRGBCNNOnlyJobCfg(vision_cfg.CameraJobCfg):
def __init__(self, cfg: dict = {}):
cfg = util.populate_isaac_ray_cfg_args(cfg)
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-v0"])
super().__init__(cfg, vary_env_count=False, vary_cnn=True, vary_mlp=False)
class CartpoleRGBJobCfg(vision_cfg.CameraJobCfg):
def __init__(self, cfg: dict = {}):
cfg = util.populate_isaac_ray_cfg_args(cfg)
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-v0"])
super().__init__(cfg, vary_env_count=True, vary_cnn=True, vary_mlp=True)
class CartpoleResNetJobCfg(vision_cfg.ResNetCameraJob):
def __init__(self, cfg: dict = {}):
cfg = util.populate_isaac_ray_cfg_args(cfg)
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-ResNet18-v0"])
super().__init__(cfg)
class CartpoleTheiaJobCfg(vision_cfg.TheiaCameraJob):
def __init__(self, cfg: dict = {}):
cfg = util.populate_isaac_ray_cfg_args(cfg)
cfg["runner_args"]["--task"] = tune.choice(["Isaac-Cartpole-RGB-TheiaTiny-v0"])
super().__init__(cfg)
Remote Clusters#
Select one of the following methods to create a Ray cluster to accept and execute dispatched jobs.
KubeRay Setup#
If using KubeRay clusters on Google GKE with the batteries-included cluster launch file, the following dependencies are also needed.
python3 -p -m pip install kubernetes Jinja2
For use on Kubernetes clusters with KubeRay,
such as Google Kubernetes Engine or Amazon Elastic Kubernetes Service, kubectl is required, and can
be installed via the Kubernetes website .
Google Cloud is currently the only platform tested, although any cloud provider should work if one configures the following.
Attention
The ray command should be modified to use Isaac python, which could be achieved in a fashion similar to
sed -i "1i $(echo "#!/workspace/isaaclab/_isaac_sim/python.sh")" \
/isaac-sim/kit/python/bin/ray && ln -s /isaac-sim/kit/python/bin/ray /usr/local/bin/ray.
An container registry (NGC, GCS artifact registry, AWS ECR, etc) with an Isaac Lab image configured to support Ray. See
cluster_configs/Dockerfileto see how to modify theisaac-lab-basecontainer for Ray compatibility. Ray should use the isaac sim python shebang, andnvidia-smishould work within the container. Be careful with the setup here as paths need to be configured correctly for everything to work. It’s likely that the example dockerfile will work out of the box and can be pushed to the registry, as long as the base image has already been built as in the container guide.A Kubernetes setup with available NVIDIA RTX (likely
l4orl40ortesla-t4ora10) GPU-passthrough node-pool resources, that has access to your container registry/storage bucket and has the Ray operator enabled with correct IAM permissions. This can be easily achieved with services such as Google GKE or AWS EKS, provided that your account or organization has been granted a GPU-budget. It is recommended to use manual kubernetes services as opposed to “autopilot” services for cost-effective experimentation as this way clusters can be completely shut down when not in use, although this may require installing the Nvidia GPU Operator .An MLFlow server that your cluster has access to (already included for Google Cloud, which can be referenced for the format and MLFlow integration).
A
kuberay.yaml.ninjafile that describes how to allocate resources (already included for Google Cloud, which can be referenced for the format and MLFlow integration).
Ray Clusters (Without Kubernetes) Setup#
Attention
Modify the Ray command to use Isaac Python like in KubeRay clusters, and follow the same steps for creating an image/cluster permissions.
See the Ray Clusters Overview or Anyscale for more information.
Also, create an MLFlow server that your local host and cluster have access to.
KubeRay Clusters Only#
k9s is a great tool for monitoring your clusters that can
easily be installed with snap install k9s --devmode.
1.) Verify cluster access, and that the correct operators are installed.
# Verify cluster access
kubectl cluster-info
# If using a manually managed cluster (not Autopilot or the like)
# verify that there are node pools
kubectl get nodes
# Check that the ray operator is installed on the cluster
# should list rayclusters.ray.io , rayjobs.ray.io , and rayservices.ray.io
kubectl get crds | grep ray
# Check that the NVIDIA Driver Operator is installed on the cluster
# should list clusterpolicies.nvidia.com
kubectl get crds | grep nvidia
2.) Create the KubeRay cluster and an MLFlow server for receiving logs that your cluster has access to. This can be done automatically for Google GKE, where instructions are included in the following creation file.
scripts/reinforcement_learning/ray/launch.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import pathlib
import subprocess
import yaml
import util
from jinja2 import Environment, FileSystemLoader
from kubernetes import config
"""This script helps create one or more KubeRay clusters.
Usage:
.. code-block:: bash
# If the head node is stuck on container creating, make sure to create a secret
python3 scripts/reinforcement_learning/ray/launch.py -h
# Examples
# The following creates 8 GPUx1 nvidia l4 workers
python3 scripts/reinforcement_learning/ray/launch.py --cluster_host google_cloud \
--namespace <NAMESPACE> --image <YOUR_ISAAC_RAY_IMAGE> \
--num_workers 8 --num_clusters 1 --worker_accelerator nvidia-l4 --gpu_per_worker 1
# The following creates 1 GPUx1 nvidia l4 worker, 2 GPUx2 nvidia-tesla-t4 workers,
# and 2 GPUx4 nvidia-tesla-t4 GPU workers
python3 scripts/reinforcement_learning/ray/launch.py --cluster_host google_cloud \
--namespace <NAMESPACE> --image <YOUR_ISAAC_RAY_IMAGE> \
--num_workers 1 2 --num_clusters 1 \
--worker_accelerator nvidia-l4 nvidia-tesla-t4 --gpu_per_worker 1 2 4
"""
RAY_DIR = pathlib.Path(__file__).parent
def apply_manifest(args: argparse.Namespace) -> None:
"""Provided a Jinja templated ray.io/v1alpha1 file,
populate the arguments and create the cluster. Additionally, create
kubernetes containers for resources separated by '---' from the rest
of the file.
Args:
args: Possible arguments concerning cluster parameters.
"""
# Load Kubernetes configuration
config.load_kube_config()
# Set up Jinja2 environment for loading templates
templates_dir = RAY_DIR / "cluster_configs" / args.cluster_host
file_loader = FileSystemLoader(str(templates_dir))
jinja_env = Environment(loader=file_loader, keep_trailing_newline=True, autoescape=True)
# Define template filename
template_file = "kuberay.yaml.jinja"
# Convert args namespace to a dictionary
template_params = vars(args)
# Load and render the template
template = jinja_env.get_template(template_file)
file_contents = template.render(template_params)
# Parse all YAML documents in the rendered template
all_yamls = []
for doc in yaml.safe_load_all(file_contents):
all_yamls.append(doc)
# Convert back to YAML string, preserving multiple documents
cleaned_yaml_string = ""
for i, doc in enumerate(all_yamls):
if i > 0:
cleaned_yaml_string += "\n---\n"
cleaned_yaml_string += yaml.dump(doc)
# Apply the Kubernetes manifest using kubectl
try:
print(cleaned_yaml_string)
subprocess.run(["kubectl", "apply", "-f", "-"], input=cleaned_yaml_string, text=True, check=True)
except subprocess.CalledProcessError as e:
exit(f"An error occurred while running `kubectl`: {e}")
def parse_args() -> argparse.Namespace:
"""
Parse command-line arguments for Kubernetes deployment script.
Returns:
argparse.Namespace: Parsed command-line arguments.
"""
arg_parser = argparse.ArgumentParser(
description="Script to apply manifests to create Kubernetes objects for Ray clusters.",
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
arg_parser.add_argument(
"--cluster_host",
type=str,
default="google_cloud",
choices=["google_cloud"],
help=(
"In the cluster_configs directory, the name of the folder where a tune.yaml.jinja"
"file exists defining the KubeRay config. Currently only google_cloud is supported."
),
)
arg_parser.add_argument(
"--name",
type=str,
required=False,
default="isaacray",
help="Name of the Kubernetes deployment.",
)
arg_parser.add_argument(
"--namespace",
type=str,
required=False,
default="default",
help="Kubernetes namespace to deploy the Ray cluster.",
)
arg_parser.add_argument(
"--service_acount_name", type=str, required=False, default="default", help="The service account name to use."
)
arg_parser.add_argument(
"--image",
type=str,
required=True,
help="Docker image for the Ray cluster pods.",
)
arg_parser.add_argument(
"--worker_accelerator",
nargs="+",
type=str,
default=["nvidia-l4"],
help="GPU accelerator name. Supply more than one for heterogeneous resources.",
)
arg_parser = util.add_resource_arguments(arg_parser, cluster_create_defaults=True)
arg_parser.add_argument(
"--num_clusters",
type=int,
default=1,
help="How many Ray Clusters to create.",
)
arg_parser.add_argument(
"--num_head_cpu",
type=float, # to be able to schedule partial CPU heads
default=8,
help="The number of CPUs to give the Ray head.",
)
arg_parser.add_argument("--head_ram_gb", type=int, default=8, help="How many gigs of ram to give the Ray head")
args = arg_parser.parse_args()
return util.fill_in_missing_resources(args, cluster_creation_flag=True)
def main():
args = parse_args()
if "head" in args.name:
raise ValueError("For compatibility with other scripts, do not include head in the name")
if args.num_clusters == 1:
apply_manifest(args)
else:
default_name = args.name
for i in range(args.num_clusters):
args.name = default_name + "-" + str(i)
apply_manifest(args)
if __name__ == "__main__":
main()
For other cloud services, the kuberay.yaml.ninja will be similar to that of
Google’s.
scripts/reinforcement_learning/ray/cluster_configs/google_cloud/kuberay.yaml.ninja
# Jinja is used for templating here as full helm setup is excessive for application
apiVersion: ray.io/v1alpha1
kind: RayCluster
metadata:
name: {{ name }}
namespace: {{ namespace }}
spec:
rayVersion: "2.8.0"
enableInTreeAutoscaling: true
autoscalerOptions:
upscalingMode: Default
idleTimeoutSeconds: 120
imagePullPolicy: Always
securityContext: {}
envFrom: []
headGroupSpec:
rayStartParams:
block: "true"
dashboard-host: 0.0.0.0
dashboard-port: "8265"
port: "6379"
include-dashboard: "true"
ray-debugger-external: "true"
object-manager-port: "8076"
num-gpus: "0"
num-cpus: "0" # prevent scheduling jobs to the head node - workers only
headService:
apiVersion: v1
kind: Service
metadata:
name: {{ name }}-head
spec:
type: LoadBalancer
template:
metadata:
labels:
app.kubernetes.io/instance: tuner
app.kubernetes.io/name: kuberay
cloud.google.com/gke-ray-node-type: head
spec:
serviceAccountName: {{ service_account_name }}
affinity: {}
securityContext:
fsGroup: 100
containers:
- env:
image: {{ image }}
imagePullPolicy: Always
name: head
resources:
limits:
cpu: "{{ num_head_cpu }}"
memory: {{ head_ram_gb }}G
nvidia.com/gpu: "0"
requests:
cpu: "{{ num_head_cpu }}"
memory: {{ head_ram_gb }}G
nvidia.com/gpu: "0"
securityContext: {}
volumeMounts:
- mountPath: /tmp/ray
name: ray-logs
command: ["/bin/bash", "-c", "ray start --head --port=6379 --object-manager-port=8076 --dashboard-host=0.0.0.0 --dashboard-port=8265 --include-dashboard=true && tail -f /dev/null"]
- image: fluent/fluent-bit:1.9.6
name: fluentbit
resources:
limits:
cpu: 100m
memory: 128Mi
requests:
cpu: 100m
memory: 128Mi
volumeMounts:
- mountPath: /tmp/ray
name: ray-logs
imagePullSecrets: []
nodeSelector:
iam.gke.io/gke-metadata-server-enabled: "true"
volumes:
- configMap:
name: fluentbit-config
name: fluentbit-config
- name: ray-logs
emptyDir: {}
workerGroupSpecs:
{% for it in range(gpu_per_worker|length) %}
- groupName: "{{ worker_accelerator[it] }}x{{ gpu_per_worker[it] }}-cpu-{{ cpu_per_worker[it] }}-ram-gb-{{ ram_gb_per_worker[it] }}"
replicas: {{ num_workers[it] }}
maxReplicas: {{ num_workers[it] }}
minReplicas: {{ num_workers[it] }}
rayStartParams:
block: "true"
ray-debugger-external: "true"
replicas: "{{num_workers[it]}}"
template:
metadata:
annotations: {}
labels:
app.kubernetes.io/instance: tuner
app.kubernetes.io/name: kuberay
cloud.google.com/gke-ray-node-type: worker
spec:
serviceAccountName: {{ service_account_name }}
affinity: {}
securityContext:
fsGroup: 100
containers:
- env:
- name: NVIDIA_VISIBLE_DEVICES
value: "all"
- name: NVIDIA_DRIVER_CAPABILITIES
value: "compute,utility"
image: {{ image }}
imagePullPolicy: Always
name: ray-worker
resources:
limits:
cpu: "{{ cpu_per_worker[it] }}"
memory: {{ ram_gb_per_worker[it] }}G
nvidia.com/gpu: "{{ gpu_per_worker[it] }}"
requests:
cpu: "{{ cpu_per_worker[it] }}"
memory: {{ ram_gb_per_worker[it] }}G
nvidia.com/gpu: "{{ gpu_per_worker[it] }}"
securityContext: {}
volumeMounts:
- mountPath: /tmp/ray
name: ray-logs
command: ["/bin/bash", "-c", "ray start --address={{name}}-head.{{ namespace }}.svc.cluster.local:6379 && tail -f /dev/null"]
- image: fluent/fluent-bit:1.9.6
name: fluentbit
resources:
limits:
cpu: 100m
memory: 128Mi
requests:
cpu: 100m
memory: 128Mi
volumeMounts:
- mountPath: /tmp/ray
name: ray-logs
imagePullSecrets: []
nodeSelector:
cloud.google.com/gke-accelerator: {{ worker_accelerator[it] }}
iam.gke.io/gke-metadata-server-enabled: "true"
tolerations:
- key: "nvidia.com/gpu"
operator: "Exists"
effect: "NoSchedule"
volumes:
- configMap:
name: fluentbit-config
name: fluentbit-config
- name: ray-logs
emptyDir: {}
{% endfor %}
---
# ML Flow Server - for fetching logs
apiVersion: apps/v1
kind: Deployment
metadata:
name: {{name}}-mlflow
namespace: {{ namespace }}
spec:
replicas: 1
selector:
matchLabels:
app: mlflow
template:
metadata:
labels:
app: mlflow
spec:
containers:
- name: mlflow
image: ghcr.io/mlflow/mlflow:v2.9.2
ports:
- containerPort: 5000
command: ["mlflow"]
args:
- server
- --host=0.0.0.0
- --port=5000
- --backend-store-uri=sqlite:///mlflow.db
---
# ML Flow Service (for port forwarding, kubectl port-forward service/{name}-mlflow 5000:5000)
apiVersion: v1
kind: Service
metadata:
name: {{name}}-mlflow
namespace: {{ namespace }}
spec:
selector:
app: mlflow
ports:
- port: 5000
targetPort: 5000
type: ClusterIP
3.) Fetch the KubeRay cluster IP addresses, and the MLFLow Server IP. This can be done automatically for KubeRay clusters, where instructions are included in the following fetching file. The KubeRay clusters are saved to a file, but the MLFLow Server IP is printed.
scripts/reinforcement_learning/ray/grok_cluster_with_kubectl.py
# Copyright (c) 2022-2025, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
import argparse
import os
import re
import subprocess
import threading
import time
from concurrent.futures import ThreadPoolExecutor, as_completed
"""
This script requires that kubectl is installed and KubeRay was used to create the cluster.
Creates a config file containing ``name: <NAME> address: http://<IP>:<PORT>`` on
a new line for each cluster, and also fetches the MLFlow URI.
Usage:
.. code-block:: bash
python3 scripts/reinforcement_learning/ray/grok_cluster_with_kubectl.py
# For options, supply -h arg
"""
def get_namespace() -> str:
"""Get the current Kubernetes namespace from the context, fallback to default if not set"""
try:
namespace = (
subprocess.check_output(["kubectl", "config", "view", "--minify", "--output", "jsonpath={..namespace}"])
.decode()
.strip()
)
if not namespace:
namespace = "default"
except subprocess.CalledProcessError:
namespace = "default"
return namespace
def get_pods(namespace: str = "default") -> list[tuple]:
"""Get a list of all of the pods in the namespace"""
cmd = ["kubectl", "get", "pods", "-n", namespace, "--no-headers"]
output = subprocess.check_output(cmd).decode()
pods = []
for line in output.strip().split("\n"):
fields = line.split()
pod_name = fields[0]
status = fields[2]
pods.append((pod_name, status))
return pods
def get_clusters(pods: list, cluster_name_prefix: str) -> set:
"""
Get unique cluster name(s). Works for one or more clusters, based off of the number of head nodes.
Excludes MLflow deployments.
"""
clusters = set()
for pod_name, _ in pods:
# Skip MLflow pods
if "-mlflow" in pod_name:
continue
match = re.match(r"(" + re.escape(cluster_name_prefix) + r"[-\w]+)", pod_name)
if match:
# Get base name without head/worker suffix (skip workers)
if "head" in pod_name:
base_name = match.group(1).split("-head")[0]
clusters.add(base_name)
return sorted(clusters)
def get_mlflow_info(namespace: str = None, cluster_prefix: str = "isaacray") -> str:
"""
Get MLflow service information if it exists in the namespace with the given prefix.
Only works for a single cluster instance.
Args:
namespace: Kubernetes namespace
cluster_prefix: Base cluster name (without -head/-worker suffixes)
Returns:
MLflow service URL
"""
# Strip any -head or -worker suffixes to get base name
if namespace is None:
namespace = get_namespace()
pods = get_pods(namespace=namespace)
clusters = get_clusters(pods=pods, cluster_name_prefix=cluster_prefix)
if len(clusters) > 1:
raise ValueError("More than one cluster matches prefix, could not automatically determine mlflow info.")
mlflow_name = f"{cluster_prefix}-mlflow"
cmd = ["kubectl", "get", "svc", mlflow_name, "-n", namespace, "--no-headers"]
try:
output = subprocess.check_output(cmd).decode()
fields = output.strip().split()
# Get cluster IP
cluster_ip = fields[2]
port = "5000" # Default MLflow port
# This needs to be http to be resolved. HTTPS can't be resolved
# This should be fine as it is on a subnet on the cluster regardless
return f"http://{cluster_ip}:{port}"
except subprocess.CalledProcessError as e:
raise ValueError(f"Could not grok MLflow: {e}") # Fixed f-string
def check_clusters_running(pods: list, clusters: set) -> bool:
"""
Check that all of the pods in all provided clusters are running.
Args:
pods (list): A list of tuples where each tuple contains the pod name and its status.
clusters (set): A set of cluster names to check.
Returns:
bool: True if all pods in any of the clusters are running, False otherwise.
"""
clusters_running = False
for cluster in clusters:
cluster_pods = [p for p in pods if p[0].startswith(cluster)]
total_pods = len(cluster_pods)
running_pods = len([p for p in cluster_pods if p[1] == "Running"])
if running_pods == total_pods and running_pods > 0:
clusters_running = True
break
return clusters_running
def get_ray_address(head_pod: str, namespace: str = "default", ray_head_name: str = "head") -> str:
"""
Given a cluster head pod, check its logs, which should include the ray address which can accept job requests.
Args:
head_pod (str): The name of the head pod.
namespace (str, optional): The Kubernetes namespace. Defaults to "default".
ray_head_name (str, optional): The name of the ray head container. Defaults to "head".
Returns:
str: The ray address if found, None otherwise.
Raises:
ValueError: If the logs cannot be retrieved or the ray address is not found.
"""
cmd = ["kubectl", "logs", head_pod, "-c", ray_head_name, "-n", namespace]
try:
output = subprocess.check_output(cmd).decode()
except subprocess.CalledProcessError as e:
raise ValueError(
f"Could not enter head container with cmd {cmd}: {e}Perhaps try a different namespace or ray head name."
)
match = re.search(r"RAY_ADDRESS='([^']+)'", output)
if match:
return match.group(1)
else:
return None
def process_cluster(cluster_info: dict, ray_head_name: str = "head") -> str:
"""
For each cluster, check that it is running, and get the Ray head address that will accept jobs.
Args:
cluster_info (dict): A dictionary containing cluster information with keys 'cluster', 'pods', and 'namespace'.
ray_head_name (str, optional): The name of the ray head container. Defaults to "head".
Returns:
str: A string containing the cluster name and its Ray head address, or an error message if the head pod or Ray address is not found.
"""
cluster, pods, namespace = cluster_info
head_pod = None
for pod_name, status in pods:
if pod_name.startswith(cluster + "-head"):
head_pod = pod_name
break
if not head_pod:
return f"Error: Could not find head pod for cluster {cluster}\n"
# Get RAY_ADDRESS and status
ray_address = get_ray_address(head_pod, namespace=namespace, ray_head_name=ray_head_name)
if not ray_address:
return f"Error: Could not find RAY_ADDRESS for cluster {cluster}\n"
# Return only cluster and ray address
return f"name: {cluster} address: {ray_address}\n"
def main():
# Parse command-line arguments
parser = argparse.ArgumentParser(description="Process Ray clusters and save their specifications.")
parser.add_argument("--prefix", default="isaacray", help="The prefix for the cluster names.")
parser.add_argument("--output", default="~/.cluster_config", help="The file to save cluster specifications.")
parser.add_argument("--ray_head_name", default="head", help="The metadata name for the ray head container")
parser.add_argument(
"--namespace", help="Kubernetes namespace to use. If not provided, will detect from current context."
)
args = parser.parse_args()
# Get namespace from args or detect it
current_namespace = args.namespace if args.namespace else get_namespace()
print(f"Using namespace: {current_namespace}")
cluster_name_prefix = args.prefix
cluster_spec_file = os.path.expanduser(args.output)
# Get all pods
pods = get_pods(namespace=current_namespace)
# Get clusters
clusters = get_clusters(pods, cluster_name_prefix)
if not clusters:
print(f"No clusters found with prefix {cluster_name_prefix}")
return
# Wait for clusters to be running
while True:
pods = get_pods(namespace=current_namespace)
if check_clusters_running(pods, clusters):
break
print("Waiting for all clusters to spin up...")
time.sleep(5)
print("Checking for MLflow:")
# Check MLflow status for each cluster
for cluster in clusters:
try:
mlflow_address = get_mlflow_info(current_namespace, cluster)
print(f"MLflow address for {cluster}: {mlflow_address}")
except ValueError as e:
print(f"ML Flow not located: {e}")
print()
# Prepare cluster info for parallel processing
cluster_infos = []
for cluster in clusters:
cluster_pods = [p for p in pods if p[0].startswith(cluster)]
cluster_infos.append((cluster, cluster_pods, current_namespace))
# Use ThreadPoolExecutor to process clusters in parallel
results = []
results_lock = threading.Lock()
with ThreadPoolExecutor() as executor:
future_to_cluster = {
executor.submit(process_cluster, info, args.ray_head_name): info[0] for info in cluster_infos
}
for future in as_completed(future_to_cluster):
cluster_name = future_to_cluster[future]
try:
result = future.result()
with results_lock:
results.append(result)
except Exception as exc:
print(f"{cluster_name} generated an exception: {exc}")
# Sort results alphabetically by cluster name
results.sort()
# Write sorted results to the output file (Ray info only)
with open(cluster_spec_file, "w") as f:
for result in results:
f.write(result)
print(f"Cluster spec information saved to {cluster_spec_file}")
# Display the contents of the config file
with open(cluster_spec_file) as f:
print(f.read())
if __name__ == "__main__":
main()
Ray Clusters Only (Without Kubernetes)#
1.) Verify cluster access.
2.) Create a ~/.cluster_config file, where name: <NAME> address: http://<IP>:<PORT> is on
a new line for each unique cluster. For one cluster, there should only be one line in this file.
3.) Start an MLFLow Server to receive the logs that the ray cluster has access to, and determine the server URI.