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What is easiest solution to automatically resolve missing mounts due to e.g. a power outage? (lemmy.nz)
submitted 9 months ago* (last edited 9 months ago) by sylverstream@lemmy.nz to c/selfhosted@lemmy.world
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I've got a QNAP NAS and two Linux servers. Whenever the power goes down, the UPS kicks in and shut downs the NAS and the Linux servers, all good. The servers + NAS are automatically started when the power comes back on line using WOL. All good.

The problem is that I have apps running using Docker which heavily rely on connections to the NAS. As the Linux servers boot quicker than the NAS, the mount points are not mounted, and thus everything falls apart. Even when I manually re-mount, it's not propagated to the Docker instances. All mount points use NFS.

Currently, I just reboot the Linux servers manually, and then all works well.

Probably easiest would be to run a cron job to check the mounts every x minutes, and if they are not mounted, then just reboot. The only issue is that this may cause an infinite loop of reboots if e.g. the NAS has been turned off.

I could also install a monitoring solution, but I've seen so many options that I'm not sure which one to do. If it's easier with a monitoring solution, I'd like the simplest one.

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[-] mbirth@lemmy.mbirth.uk 3 points 9 months ago

Not sure how Docker behaves, but in a Stack/Compose file you can define volumes to use a specific driver, such as smb. E.g.:

volumes:
  smb-calibre:
    driver_opts:
      type: "smb3"
      device: "//mynas/ebooks/CalibreDB"
      o: "ro,vers=3.1.1,addr=192.168.1.1,username=mbirth,password=secret,cache=loose,iocharset=utf8,noperm,hard"

So Docker will take care of mounting. Paired with restart: unless-stopped, all my Containers come back online just fine after an outage.

this post was submitted on 13 Feb 2024
63 points (100.0% liked)

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