wickedd fails to start if local mount is nested over nfs mount

This document (7018322) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12 Service Pack 1 (SLES 12 SP1)
SUSE Linux Enterprise Server 12

Situation

When a local fs or device is mounted over a NFS mount, nscd and wickedd and subsequently network fail to start during boot.
For example /etc/fstab would look like this:

/dev/system/root        /               ext4    acl,user_xattr    1 1
nfs-server:/nfsmount /mnt-test nfs defaults 0 0 /dev/mapper/<dev-name> /mnt-test/data ext4 defaults 0 0

In this case, the local /dev/mapper/dev is mounted over the nfs mount: /nfsmount.
The following is logged in the boot messages:

systemd[1]: Breaking ordering cycle by deleting job wickedd-nanny.service/start
systemd[1]: Job wickedd-nanny.service/start deleted to break ordering cycle starting with wicked.service/start
systemd[1]: Found ordering cycle on wicked.service/start
systemd[1]: Found dependency on wickedd.service/start
systemd[1]: Found dependency on local-fs.target/start
systemd[1]: Found dependency on mnt-test.mount/start
systemd[1]: Found dependency on mnt.mount/start
systemd[1]: Found dependency on network-online.target/start
systemd[1]: Found dependency on wicked.service/start
systemd[1]: Breaking ordering cycle by deleting job wickedd.service/start

Resolution

Adding the mount option _netdev to the local mount fixes the ordering cycle, as an example, the line in /etc/fstab will look like this after:
/dev/mapper/<dev-name>  /mnt-test/data  ext4    defaults,_netdev     0 0


Cause

The local fs has to come up first and then the network filesystem.
Now in this case the local fs (/dev/mapper) counts as filesystem based on network as well because it's mount point is on a network filesystem. However it's recognized as local fs and wickedd is tried to be started too early.

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7018322
  • Creation Date: 23-Nov-2016
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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