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Hi there,
I'm currently tweaking my nfs setup.
What do I want
Mount my exported directories via bind to export, when the nfs-server starts. And unmount the directories on stop of the nfs-server
Approach
/etc/systemd/system/nfs.target
[Unit]
Description=Network File System Server
Wants=export-daten.mount export-daten-Downloads.mount export-portage.mount export-root.mount export-root-boot.mount
Requires=nfs-server.service
BindsTo=nfs-server.service
[Install]
WantedBy=multi-user.target/etc/systemd/system/export-daten.mount
[Unit]
Description=/home/blubb/Daten nach /export/daten
BindsTo=nfs-server.service
StopWhenUnneeded=true
[Mount]
What=/home/blubb/Daten
Where=/export/daten
Options=bind
[Install]
WantedBy=nfs.targetls nfs.target.wants
export-daten-Downloads.mount export-daten.mount export-portage.mount export-root-boot.mount export-root.mountnfs-server.service is the original one shipped by Arch in /usr/lib/systemd/system.
Current behaviour
start nfs.target: mounts directories, starts nfs-server
stop nfs.target: unmounts directories, doesn't stop nfs-server
start nfs-server.service fails, because can't export /export/daten/Downloads, which doesn't exist, because the mount-units were not processed.
stop nfs-server.service: umount directories (due to the BindsTo directive) and stops the nfs.target.
Desired behaviour
The current behaviour works, but isn't very clean. Would be nice, if nfs.target stops the nfs-server.service too. I don't want nfs-server.service copy to /etc and modify as I will miss any updates of the original unit in /usr/lib.
Is it possible to stop nfs-server.service in/by nfs.target?
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I don't want nfs-server.service copy to /etc and modify as I will miss any updates of the original unit in /usr/lib.
You can add something to a unit file without doing this, as is explained in 'man systemd.unit':
Along with a unit file foo.service, a directory foo.service.d/ may exist. All files with the suffix ".conf" from this
directory will be parsed after the file itself is parsed. This is useful to alter or add configuration settings to a unit,
without having to modify their unit files.
So you can create a 'nfs-server.service.d/custom.conf' file with:
[Unit]
BindsTo=nfs.targetNormally this should stop the nfs-server service when nfs.target is stopped.
It needs testing to confirm it though.
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Tanks, works so far. One problem is left.
For some reason, nfs option nohide doesn't work. So I have to export other filesystems in subtree too. My 2 units:
export-daten.mount
[Unit]
Description=/home/sm/Daten nach /export/daten
BindsTo=nfs-server.service
StopWhenUnneeded=true
[Mount]
What=/home/sm/Daten
Where=/export/daten
Options=bind
[Install]
WantedBy=nfs.targetand the filesystem, which is mounted in there:
export-daten-Downloads.mount
[Unit]
Description=/home/sm/Daten/Downloads nach /export/daten/Downloads
BindsTo=nfs-server.service
Requires=export-daten.mount
StopWhenUnneeded=true
[Mount]
What=/home/sm/Daten/Downloads
Where=/export/daten/Downloads
Options=bind
[Install]
WantedBy=nfs.targetAccording to the Manpage I'm not sure, if the Requires option is even recognized. Mounting works. But when I stop my nfs-server, I get this message:
journalctl
Feb 12 07:23:53 Nas systemd[1]: Stopping Network File System Server.
Feb 12 07:23:53 Nas systemd[1]: Stopped target Network File System Server.
Feb 12 07:23:53 Nas systemd[1]: Unit export-daten-Downloads.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Unit export-portage.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Unit export-root-boot.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Unmounting /boot nach /export/root/boot...
Feb 12 07:23:53 Nas systemd[1]: Unit export-root.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Unmounting /var/portage nach /export/portage...
Feb 12 07:23:53 Nas systemd[1]: Stopping NFS server and services...
----------------------------------------
Feb 12 07:23:53 Nas systemd[1]: Unmounting /home/sm/Daten/Downloads nach /export/daten/Downloads...
Feb 12 07:23:53 Nas systemd[1]: Unit export-daten.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Unit export-root-home-sm-Daten-Downloads.mount entered failed state.
----------------------------------------
Feb 12 07:23:53 Nas kernel: nfsd: last server has exited, flushing export cache
Feb 12 07:23:53 Nas systemd[1]: Unmounted /boot nach /export/root/boot.
Feb 12 07:23:53 Nas systemd[1]: Unit export-root.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Unmounted /var/portage nach /export/portage.
Feb 12 07:23:53 Nas systemd[1]: Unmounted /home/sm/Daten/Downloads nach /export/daten/Downloads.
Feb 12 07:23:53 Nas systemd[1]: Unit export-daten.mount is not needed anymore. Stopping.
Feb 12 07:23:53 Nas systemd[1]: Stopped NFS server and services.
Feb 12 07:23:53 Nas systemd[1]: Stopping NFS Mount Daemon...
Feb 12 07:23:53 Nas rpc.mountd[21709]: Caught signal 15, un-registering and exiting.
Feb 12 07:23:53 Nas systemd[1]: Unmounting /home/sm/Daten nach /export/daten...
Feb 12 07:23:53 Nas systemd[1]: Unmounting / nach /export/root...
Feb 12 07:23:53 Nas systemd[1]: Stopped NFS Mount Daemon.
Feb 12 07:23:53 Nas systemd[1]: Unmounted /home/sm/Daten nach /export/daten.
Feb 12 07:23:53 Nas systemd[1]: Unmounted / nach /export/root.Manpage:
If a mount point is beneath another mount point in the file system hierarchy, a dependency between both units is created automatically.
It seems, that works for mounting, but not for the umount.
Can I do something to unmount that stuff cleaner?
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Sorry but I don't understand 'nach' in the journalctl output.
Can you explain more clearly the problem with the umount.
Because I see:
Feb 12 07:23:53 Nas systemd[1]: Unmounted /home/sm/Daten/Downloads nach /export/daten/Downloads.
...
Feb 12 07:23:53 Nas systemd[1]: Unmounted /home/sm/Daten nach /export/daten.So what is the problem?
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Sorry for the language stuff. "nach" means in this case "to".
You're right, the sequence is correct. But why do I get this message:
Unit export-root-home-sm-Daten-Downloads.mount entered failed state.
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