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Migrate Docker Containers from VM to NFS Share? (lemmy.world)

submitted 12 hours ago by stardustsystem@lemmy.world to c/selfhosted@lemmy.world

4 comments fedilink hide all child comments

Hello everybody, happy Monday.

I'm hoping to get a little help with my most recent self-hosting project. I've created a VM on my Proxmox instance with a 32GB disk and installed Ubuntu, Docker, and CosmOS to it. Currently I have Gitea, Home Assistant, NextCloud, and Jellyfin installed via CosmOS.

If I want to add more services to Cosmos, then I need to be able to move the containers from the VM's 32GB disk into an NFS Share mounted on the VM which has something like 40TB of storage at the moment. My hope is that moving these Containers will allow them to grow on their own terms while leaving the OS disk the same size.

Would some kind of link allow me to move the files to the NFS share while making them still appear in their current locations in the host OS (Ubuntu 24.04). I'm not concerned about the NFS share not being available, it runs on the same server virtualizing everything else and it's configured to start before everything else so the share should be up and running by the time the server is in any situation. If anyone can see an obvious problem with that premise though, I'd love to hear about it.

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[–] mhzawadi@lemmy.horwood.cloud 2 points 2 hours ago

If you have your services in compose files, you can point the volumes to anywhere. Even NFS.

Like the below config

volumes: pihole01: driver: local driver_opts: type: 'none' o: 'bind' device: '/mnt/data/docker/pihole01'

[–] ramielrowe@lemmy.world 3 points 9 hours ago

In general, container root filesystems and the images backing them will not function on NFS. When deploying containers, you should be mounting data volumes into the containers rather than storing things on the container root filesystems. Hopefully you are already doing that, otherwise you're going to need to manually copy data out of the containers. Personally, if all you're talking about is 32 gigs max, I would just stop all of the containers, copy everything to the new NFS locations, and then re-create the containers to point at the new NFS locations.

All this said though, some applications really don't like their data stored on NFS. I know Plex really doesn't function well when it's database is on NFS. But, the Plex media directories are fine to host from NFS.

[–] OneCardboardBox@lemmy.sdf.org 3 points 11 hours ago* (last edited 11 hours ago)

If you want to move your containers to a different location, look into configuring docker's data-root: https://stackoverflow.com/questions/24309526/how-to-change-the-docker-image-installation-directory

You copy /var/lib/docker to a new location and update /etc/docker/daemon.json

I will say: Moving data-root to an NFS mount isn't going to work well. I've tried it, and docker containers rely on filesystem features to run their overlays. On an NFS, this feature isn't present, so your services will duplicate the container's entire filesystem. This will tank your performance and is basically unusable for anything but trivial examples. Docker data-root basically needs to be a "physical" disk.

I've had no issues using NFS shares mounted as docker volumes. It's just the data-root where it'll fail.

[–] just_another_person@lemmy.world 0 points 11 hours ago

Your goal isn't super clear from the post.

Are you asking how to host an OS on an NFS share?