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OpenStack Cinder Volumes Become Read-Only After cinder-volume Container Restart

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openstack
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openstack
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Applies to

  • OpenStack environments using Cinder with NetApp ONTAP NFS backend
  • ONTAP 9
  • Cinder volumes hosted on NFS
  • Cinder backends with nas_secure_file_operations and nas_secure_file_permissions parameters

Issue

After restarting the cinder-volume container, multiple Cinder volumes unexpectedly switched to read-only mode, causing service outages for virtual machines (VMs) and The following errors were observed in logs:

ERROR:__main__:Failed to change ownership of /var/lib/cinder/mnt/<volume>/.snapshot/<snapshot> to 42407:42407
Traceback (most recent call last):
  File "/usr/local/bin/kolla_set_configs", line 352, in set_perms
    os.chown(path, uid, gid)
OSError: [Errno 30] Read-only filesystem: '/var/lib/cinder/mnt/<volume>/.snapshot/<snapshot>'

Symptoms included:

  • cinder-volume container repeatedly crashing and restarting
  • Cinder volumes mounted read-only on VMs, resulting in loss of write access and service outages
  • The issue was triggered after a hostname change and subsequent service restarts

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