What were you trying to do that didn't work?

The resource-agent "nfsserver" fails to stop when `nfsv4_only=true`.

What is the impact of this issue to you?

A cluster node will be fenced because the resource-agent fails to successfully stop.

Please provide the package NVR for which the bug is seen:

resource-agents-4.9.0-54.el8_10.1.x86_64

How reproducible is this bug?:

Happens every time

Steps to reproduce

1.  # pcs resource create nfs-daemon nfsserver nfs_no_notify=true nfsv4_only=true nfs_shared_infodir=/nfsmq/nfsinfo --group nfsgroup
2.  # pcs resource disable nfs-daemon

Expected results

The resource nfsserver should successfully stop.

Actual results

The resource nfsserver fails when it is stopped.

For example:

# pcs resource debug-stop nfs-daemon
Operation force-stop for nfs-daemon (ocf:heartbeat:nfsserver) returned 1 (error: Failed to unmount a bind mount)
[.....]
+ 14:29:52: remove_unshare_uts_dropins:749: false
+ 14:29:52: nfsserver_stop:1015: return 1

Then we can see that rpc-statd.service is what process that is still using the filesystem that failed to unmount because that service was never stopped when we try to stop the nfsserver resource-agent.

1. lsof /var/lib/nfs
   COMMAND     PID    USER   FD   TYPE DEVICE SIZE/OFF     NODE NAME
   rpc.statd 39990 rpcuser  cwd    DIR  253,7       56 12583040 /var/lib/nfs/statd

The reason that the nfsserver fails to stop when the attribute nfsv4_only=true is enabled is because it does not stop or start the systemd service rpc-statd.service when that attribute is enabled.

• https://github.com/ClusterLabs/resource-agents/blob/main/heartbeat/nfsserver#L950
• https://github.com/ClusterLabs/resource-agents/blob/main/heartbeat/nfsserver#L879

The system service rpc-statd.service is always started because it is a dependency of the systemd service nfs-server.service that is started when the resource-agent nfsserver is started.

# systemctl list-dependencies nfs-server | grep rpc-statd
● ├─rpc-statd-notify.service
● ├─rpc-statd.service

Workaround is to stop rpc-statd.service before stopping the resource-agent nfsserver.