Add pids_limit and ulimits to docker-compose- edit to docker-compose.…

[george-nehma]

add to docker-compose.yaml to fix child process on Rocky Linux 9.6

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.
List any dependencies that are required for this change.

Fixes #4485

Rocky Linux 9.6 gets an error with child processes under the current docker-compose.yaml file as in #4485.

2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] [parent]: timed out waiting for the child process 1001570 to exec {errno = -1/Unknown error -1}
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] failed to fork the child process {errno = -1/Unknown error -1, lastErrno = 11/Resource temporarily unavailable}
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] launch descriptor for '/usr/bin/nvidia-smi' (2 arguments)
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] cmd: /usr/bin/nvidia-smi -q
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] onReadStdout = 0x7f80e89785f0
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] onReadStderr = 0x7f80e89785f0
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] readStdoutContext = 0x7f811efffaa0
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] readStderrContext = 0x7f811efffa60
2026-01-28T20:03:24Z [10,554ms] [Error] [carb.launcher.plugin] interpreter = '/bin/bash'

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshots

Please attach before and after screenshots of the change if applicable.

Checklist

• I have read and understood the contribution guidelines
• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds resource limit configurations to the Docker Compose services to resolve child process fork errors on Rocky Linux 9.6. The changes add pids_limit: 0 (unlimited processes) and ulimits settings for both nproc (65535) and nofile (65536) to the isaac-lab-base and isaac-lab-ros2 services.

Key Changes:

• Set pids_limit: 0 to remove process limits within containers
• Configured ulimits.nproc: 65535 to allow sufficient process creation
• Configured ulimits.nofile soft/hard limits to 65536 to allow sufficient file descriptors
• Applied consistently to both isaac-lab-base and isaac-lab-ros2 services

These settings align with the existing configuration in .github/actions/run-tests/action.yml:101-102 where similar ulimits are already used for test containers, ensuring consistency across the project's Docker configurations.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The changes are well-understood Docker resource limit configurations that address a specific issue on Rocky Linux 9.6. The pids_limit and ulimits settings are standard Docker Compose directives used to prevent resource exhaustion errors. These same values are already used in the project's GitHub Actions test runner, demonstrating they are tested and appropriate. The changes are isolated to docker-compose.yaml configuration and don't modify any application code.
• No files require special attention

Important Files Changed

Filename	Overview
docker/docker-compose.yaml	Added pids_limit: 0 and ulimits configuration to both isaac-lab-base and isaac-lab-ros2 services to fix child process fork errors on Rocky Linux 9.6

Sequence Diagram

sequenceDiagram
    participant User
    participant DockerCompose as Docker Compose
    participant Container as Isaac Lab Container
    participant IsaacSim as Isaac Sim Process
    participant ChildProc as Child Processes

    User->>DockerCompose: docker-compose up
    DockerCompose->>Container: Create container with config
    Note over Container: pids_limit: 0<br/>ulimits.nproc: 65535<br/>ulimits.nofile: 65536
    
    Container->>Container: Apply resource limits
    Container->>IsaacSim: Start Isaac Sim
    IsaacSim->>ChildProc: Fork nvidia-smi process
    
    alt Before Fix (Rocky Linux 9.6)
        ChildProc--xIsaacSim: ERROR: Resource temporarily unavailable
        Note over IsaacSim: errno = 11<br/>Failed to fork child process
    else After Fix
        ChildProc-->>IsaacSim: Success
        Note over IsaacSim: Child processes created<br/>within configured limits
    end
    
    IsaacSim->>Container: Continue execution
    Container->>User: Container ready

Loading

[greptile-apps]

_{1 file reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}