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When the container service mounts the self-built nfs, the event "Operation not permitted" is reported. How to handle it?

Created on 2025-04-25 14:34:01
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When encountering the "Operation not permitted" error while mounting a self-built NFS (Network File System) in a container service, it typically indicates a permissions issue. This can stem from various factors such as incorrect NFS server configuration, insufficient privileges for the client, or network-related problems.

Handling Steps:

  1. Verify NFS Server Configuration:

    • Ensure that the NFS server is properly configured to export the desired directory.
    • Check the /etc/exports file on the NFS server for correct settings. For example:
      /exported_directory *(rw,sync,no_subtree_check)
    • After updating the exports file, run sudo exportfs -ra to re-export the directories.

  2. Check Permissions:

    • Ensure that the user and group IDs (UIDs and GIDs) on the NFS client match those expected by the NFS server.
    • Verify that the directory permissions on the NFS server allow read/write access to the client.

  3. Network Configuration:

    • Confirm that there are no firewall rules blocking NFS traffic between the client and server.
    • Ensure that both the client and server can reach each other over the network using tools like ping.

  4. Container Service Configuration:

    • If using a container orchestration platform, ensure that the service account used by the container has the necessary permissions to mount the NFS volume.
    • Check the mount options specified in the container configuration. For instance, ensuring that nolock is not used unless necessary.

Example:
Suppose you have an NFS server at 192.168.1.100 exporting /data and a Kubernetes pod trying to mount it. If you encounter the "Operation not permitted" error, you might check:

  • The /etc/exports file on the server to ensure /data is correctly exported.
  • The UID/GID mappings between the server and the pod.
  • Firewall settings to ensure NFS ports (usually 111, 2049) are open.

Recommendation for Cloud Services:
If you're operating within a cloud environment, consider leveraging managed services that simplify NFS setup and management. For instance, Tencent Cloud offers services like Cloud File Storage (CFS), which provides a scalable, high-performance file system that can be easily integrated into container environments, reducing the need for self-managed NFS setups and associated complexities.