62
What is easiest solution to automatically resolve missing mounts due to e.g. a power outage? (lemmy.nz)
submitted 2 years ago* (last edited 2 years ago) by sylverstream@lemmy.nz to c/selfhosted@lemmy.world
25 comments fedilink hide all child comments

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.

you are viewing a single comment's thread
view the rest of the comments
[-] h3ndrik@feddit.de 17 points 2 years ago* (last edited 2 years ago)

I think that is a good question to write something positive about SystemD.

I start my services with SystemD. I also moved my containers and docker-compose stack to be started by systemd. And it does mounting and bind-mounts, too. So I removed things from /etc/fstab and instead created unit files for systemd to mount the network mounts. And then you can edit the service file that starts the docker-container and say it relies on the mount. SystemD will figure it out and start them in the correct order, wait until the network and the mounts are there.

You have to put some effort in but it's not that hard. And for me it's turned out to be pretty reliable and low maintenance.

this post was submitted on 13 Feb 2024
62 points (98.4% liked)

Selfhosted

60542 readers
1539 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Detailed Rules Post

  1. Be civil.

  2. No spam.

  3. Posts are to be related to self-hosting.

  4. Don't duplicate the full text of your blog or readme if you're providing a link.

  5. Submission headline should match the article title.

  6. No trolling.

  7. Promotion posts require active participation, with an account that is at least 30 days old. F/LOSS without a paywall has exceptions, with requirements. See the rules link for details. Tags [CBH] or [AIP] are required, see the link in Rule 8 for details.

  8. AI-related discussions and AI-involved promotional posts have additional requirements for tagging, as noted in Rule 7 and the AI & Promotional Post Expanded Rules post. )

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 3 years ago
MODERATORS
ruud@lemmy.world
Loki@lemmy.world
CannaVet@lemmy.world
devve@lemmy.world
ayyy@sh.itjust.works
curbstickle@anarchist.nexus
curbstickle_lw@lemmy.world