Docker Permission Error
Docker permission errors prevent containers from accessing required resources like GPUs, files, or network.
Docker permission errors prevent containers from accessing required resources like GPUs, files, or network.
What this failure is
Docker Permission Error is a Environment failure seen during ML training runs. Docker permission errors prevent containers from accessing required resources like GPUs, files, or network. Common tags: Docker, Container, Permissions, Gpu.
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Why it happens (the mechanism)
Container user not in docker group. Container user not in video group. SELinux blocking device access. Filesystem mounted with restrictive permissions. Taken together, these mechanisms explain why the failure is reproducible, why it tends to surface on specific workloads or scales, and why generic mitigation attempts often fall short without addressing the underlying cause.
What you'll observe
- Container can't access GPU
- File permission denied in container
- Network access denied
Common symptoms and what they mean
| Symptom | Why it happens |
|---|---|
| Permission denied: /dev/nvidia0 | Container user not in docker group |
| docker.sock permission denied | Container user not in video group |
| EACCES: permission denied | SELinux blocking device access |
Which systems are affected
- Docker containers on shared systems
- Non-root user in container
- SELinux or AppArmor restrictions
How to confirm this is the problem
Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.
- ✓Reproduce the failure from a clean checkpoint/seed: the symptom must appear without warm-up state from a previous run.
- ✓Verified signal present: Permission denied: /dev/nvidia0
- ✓Verified signal present: docker.sock permission denied
- ✓Verified signal present: EACCES: permission denied
- ✓A targeted fix from the "How to fix it" section eliminates or substantially reduces the symptom within one validation pass.
The fix and the prevention pattern
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Diagnose this failure in VS Code
Select the traceback or open the failed terminal, then run Denpex locally to see the initiating rank, collateral failures, exact fix, and verification command without uploading the log.
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Root cause
- Container user not in docker group
- Container user not in video group
- SELinux blocking device access
- Filesystem mounted with restrictive permissions
The fix and how to prevent it
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