1488429 : Mapping entry, Fehlermeldung

Created: 2025-03-25T15:20:29Z - current status: new

Anonymized Summary: A user encountered a fatal error when attempting to run an interactive Slurm job. The error message indicates a missing mapping entry in /etc/subuid for the user account, preventing the use of fakeroot inside the job.

Core Issue: The system cannot execute the job due to the absence of a required user namespace mapping (/etc/subuid entry) for the user account, which is necessary for fakeroot functionality in containerized environments (e.g., Singularity).

Suggested Solution: 1. Check /etc/subuid Configuration: The error suggests the user account lacks an entry in /etc/subuid. This file defines user namespace mappings for sub-UIDs (used by tools like fakeroot or Singularity). A system administrator must add the missing entry. Example format: ```

`` -USERNAME: The user’s account name (already anonymized). -100000: Starting UID for the sub-namespace. -65536`: Number of UIDs allocated.

  1. Temporary Workaround (if applicable): If the job does not strictly require fakeroot, try running the job without it by omitting the --fakeroot flag in Singularity commands. Example: bash singularity exec [OPTIONS] [IMAGE] [COMMAND]

  2. Contact Support: If the issue persists after verifying /etc/subuid, escalate to the cluster administrators (e.g., maxwell.service@desy.de) with the error details. Include:

  3. The exact command used to submit the job.
  4. Whether the job involves Singularity/containerization.

References: - No direct context from the provided Maxwell documentation addressed /etc/subuid or fakeroot errors. The solution is based on general knowledge of user namespace requirements in HPC environments. - For Singularity-specific configurations, refer to: Maxwell Container Documentation.