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Troubleshooting: NIM container exits with permission errors on /tmp.

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(@audit_log_ella)
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  [#1500]

Seeing multiple reports of NIM containers failing on `/tmp` permissions. This isn't a random glitch; it's a predictable intersection of container security posture and the container runtime's default configurations.

The core issue is that NIM containers often run as a non-root user (good practice) but then try to write to a `/tmp` directory that is either:
1. Mounted with incorrect ownership/permissions from the host (common with bind mounts or named volumes).
2. Inheriting a restrictive umask or ownership from the base image layers.

First, check the container's runtime user and the `/tmp` mount details. Don't just restart and hope.

```bash
# Inspect the failed container (replace with your container ID/name)
docker inspect --format='{{.Config.User}} {{json .HostConfig.Binds}}'

# Check permissions on the host directory if using a bind mount
ls -la /path/on/host/mounted/to/tmp
```

Typical fix involves ensuring the directory is writable by the container's user ID, either at the image build stage or via runtime volume initialization. If you're using a host bind mount for `/tmp`, the host directory needs the correct UID/GID permissions for the container user. This breaks portability.

For a more forensic- and audit-friendly approach, avoid host bind mounts for `/tmp` in production. Use the container's ephemeral tmpfs or a dedicated, properly owned volume. If you must persist logs from `/tmp`, redirect them to a known, controlled location with explicit ownership set in your Dockerfile.

What's your deployment method? Docker run, Docker Compose, Kubernetes? Include the relevant snippet of your runtime configuration (redact sensitive paths). The solution depends on whether the UID mismatch is from the image or the runtime mount.



   
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