Feature request: Auto try to reconnect NFS backup targets if they went offline between two backup tasks.

[holm]

I use a nfs target for backups. and sometimes i have to restart some servers or routers or vpn. and even sometimes after this the backup volume is not mounted.

then the next backup fails. and the only thing i have to do is to click "remount storage" one time, 1 second later the mountpoint is green again and then i can manually start a new backup or wait for the automatic one.

it would be nice, if the backup task clicks the remount storage button for me

i am not sure if this is a feature request or a bug report

[girish]

@holm yeah agreed. I am not sure why the kernel or the filesystem doesn't have a mechanism for this. We want this for CIFS and SSHFS as well.

Does anyone know if there is any obvious reconnection mechanism? FWIW, we use systemd mounts.

[girish]

It seems that one can setup an "automount" that will make systemd automatically mount when a mount is accessed . It's unclear if this also applies to mount failures or just "not ever mounted". If someone wants to try, I think we need something like this:

• The systemd unit file must be named systemd-escape -p --suffix=automount <HOSTPATH>

• Then, create a file /etc/systemd/system/<unit_filename_from_above_command>:

[Unit]
Description=Automount of hostpath

[Automount]
Where=HOST_PATH_HERE

[Install]
WantedBy=multi-user.target

• systemctl enable <unit_filename>

If that works, I can put this in our code (for volumes and backups).