[Bug 1971935] Re: Invalid pipefs-directory prevents rpc-gssd.service from starting

[Andreas Hasenack]

Interesting, that gives me something to work on. Same happened here, and
guess where rpc_pipefs is mounted in the end...

$ sudo apt install autofs -y
(...)
Not creating home directory `/var/lib/nfs'.
Created symlink /etc/systemd/system/multi-user.target.wants/nfs-client.target → /lib/systemd/system/nfs-client.target.
Created symlink /etc/systemd/system/remote-fs.target.wants/nfs-client.target → /lib/systemd/system/nfs-client.target.
auth-rpcgss-module.service is a disabled or a static unit, not starting it.
nfs-idmapd.service is a disabled or a static unit, not starting it.
nfs-utils.service is a disabled or a static unit, not starting it.
proc-fs-nfsd.mount is a disabled or a static unit, not starting it.
rpc-gssd.service is a disabled or a static unit, not starting it.
rpc-statd-notify.service is a disabled or a static unit, not starting it.
rpc-statd.service is a disabled or a static unit, not starting it.
rpc-svcgssd.service is a disabled or a static unit, not starting it.
rpc_pipefs.target is a disabled or a static unit, not starting it.
var-lib-nfs-rpc_pipefs.mount is a disabled or a static unit, not starting it.
Processing triggers for man-db (2.10.2-1) ...
Processing triggers for libc-bin (2.35-0ubuntu3) ...

$ mount -t rpc_pipefs
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)

$ sudo systemctl status run-rpc_pipefs.mount
○ run-rpc_pipefs.mount - RPC Pipe File System
     Loaded: loaded (/run/systemd/generator/run-rpc_pipefs.mount; generated)
     Active: inactive (dead)
      Where: /run/rpc_pipefs
       What: sunrpc

$ sudo systemctl status var-lib-nfs-rpc_pipefs.mount 
● var-lib-nfs-rpc_pipefs.mount - RPC Pipe File System
     Loaded: loaded (/proc/self/mountinfo; static)
     Active: active (mounted) since Tue 2022-07-05 12:45:11 UTC; 33s ago
      Where: /var/lib/nfs/rpc_pipefs
       What: sunrpc
      Tasks: 0 (limit: 1119)
     Memory: 20.0K
        CPU: 1ms
     CGroup: /system.slice/var-lib-nfs-rpc_pipefs.mount

Jul 05 12:45:11 j-autofs-nfs-common systemd[1]: Mounting RPC Pipe File System...
Jul 05 12:45:11 j-autofs-nfs-common systemd[1]: Mounted RPC Pipe File System.

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https://bugs.launchpad.net/bugs/1971935

Title:
  Invalid pipefs-directory prevents rpc-gssd.service from starting

Status in nfs-utils package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 22.04 Server
  Package version: 1:2.6.1-1ubuntu1

  Package nfs-common/nfs-utils provides /etc/nfs.conf and /lib/systemd/system/rpc-gssd.service.
  /etc/nfs.conf (and seems to be copied from /usr/share/nfs-common/conffiles/nfs.conf) has the configuration:
  ...
  [general]
  pipefs-directory=/run/rpc_pipefs
  ...

  When attempting to start rpc-gssd it gives the following error:
  ...
  ERROR: opendir(/run/rpc_pipefs) failed: No such file or directory
  ...

  There is a systemd unit called var-lib-nfs-rpc_pipefs.mount which
  mounts this directory as /var/lib/nfs/rpc_pipefs. However this does
  not match with the configuration in nfs.conf

  It's worth mentioning that sometimes it seems a systemd unit is
  generated (run-rpc_pipefs.mount) which ensures /run/rpc_pipefs is
  created and everything works as expected. Seems to be random.

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