Race condition between Jellyfin and NAS

Race condition between Jellyfin and NAS - Printable Version

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Race condition between Jellyfin and NAS - unmesh59 - 2024-10-16

I have Jellyfin running on Ubuntu on one server and a separate NAS with the media files. After a power outage, the machine with Jellyfin powers up first with the consequence that the SMB mount of the NAS fails and I have to run "sudo mount -a" manually after some time.

Is there a way to automate the sequencing of events so that the dependencies are met?

I'd be willing to live with a single mount event firing a fixed time after reboot if deterministically waiting for the NAS to be up is too difficult.

RE: Race condition between Jellyfin and NAS - TheDreadPirate - 2024-10-16

You can modify the jellyfin service file to require that a mount be present before attempting to start.

Modify /etc/systemd/system/multi-user.target.wants/jellyfin.service and add "RequiresMountFor" in the [Service] section. I've provided an example below.

Code:
[Unit]

Description = Jellyfin Media Server

After = network-online.target

[Service]

RequiresMountsFor=/media/library

Type = simple

EnvironmentFile = /etc/default/jellyfin

User = jellyfin

Group = jellyfin

WorkingDirectory = /var/lib/jellyfin

ExecStart = /usr/bin/jellyfin $JELLYFIN_WEB_OPT $JELLYFIN_FFMPEG_OPT $JELLYFIN_SERVICE_OPT $JELLYFIN_NOWEBAPP_OPT $JELLYFIN_ADDITIONAL_OPTS

Restart = on-failure

TimeoutSec = 15

SuccessExitStatus=0 143

[Install]

WantedBy = multi-user.target

I want to note that this will only work if you've defined your SMB mount in /etc/fstab. RequiresMountFor uses the fstab parameters to determine when the mount is actually available.

RE: Race condition between Jellyfin and NAS - unmesh59 - 2024-10-17

My fstab entry is
//192.168.1.206/Share1 /mnt/Syno cifs credentials=/etc/cifs-credentials

I expect I should replace /media/library in your example with my mount point which is /mnt/Syno

Also, my experience with power outages is that Ubuntu does not seem to retry the mount if it fails the first time and I have to automount using the fstab entry. Did I not wait long enough or will this change somehow cause the OS to retry mounting? Or something more has to be done on/to Ubuntu?

Thanks.

RE: Race condition between Jellyfin and NAS - TheDreadPirate - 2024-10-17

Yes, you'd replace /media/library with your mount location.

In your fstab you can try adding the retry option.

Code:
//192.168.1.206/Share1 /mnt/Syno cifs credentials=/etc/cifs-credentials,retry=5

This will retry for 5 minutes before giving up.

RE: Race condition between Jellyfin and NAS - unmesh59 - 2024-10-17

Awesome! I will add that and wait for the next power outage which may not be too far away :-(