this post was submitted on 01 Nov 2023
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How do you backup your docker containers when so much is owned by root? (alien.top)
submitted 1 year ago by [email protected] to c/[email protected]
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I am trying to setup a restic job to backup my docker stacks, and with half of everything owned by root it becomes problematic. I've been wanting to look at podman so everything isn't owned by root, but for now I want to backup my work I built.

Also, how do you deal with some docker containers having databases. Do you have to create exports for all docker containers that have some form of database?

I've spent the last few days moving all my docker containers to a dedicated machine. I was using a mix of NFS and local storage before, but now I am doing everything on local NVME. My original plan was having everything on NFS so I would worry about backups there, and I might go back to that.

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[–] [email protected] 2 points 1 year ago (1 children)

Don’t backup the container!!

Map volumes with your data to physical storage and then simply backup those folders with the rest of your data. Docker containers are already either backed up in your development directory (if you wrote them) or GitHub so like the operating system itself, no need tk backup anything. The whole idea of Docker is the containers are ephemeral. They are reset at every reboot.

[–] [email protected] 1 points 1 year ago

This is the only correct answer.

Containers are ephemeral and stateless. If you're not mounting a volume, think of what happens if the container dies during your process for exporting the data. A failure mode not possible if you mount.