Options in backing up persistent docker volumes?
3 years ago by r0ckr to c/selfhosted
Hi all
I'm running several docker containers with local persistent volumes that I would like to backup. I haven't found an easy method to do so.
What do you use / recommend to do that? AFAIK you can't just rsync the volume directory while the container is running.
This is your answer. It also has the benefit of allowing you to have a nice folder structure for your Docker setup, where you have a folder for each service holding the corresponding compose yaml and data folder(s)
Exactly the reason why i always exchange the volumes in any compose file with bind mounts.
Also you don‘t have the provlem of many dangling volumes
I don't even understand what the advantage is to using volumes rather than mounts? So I too always use mounts.
docker volume is an exact same normal directory under /var/lib/docker, there's no difference with regard to backup consistency.
there's no silver bullet here, it's best to use tools specific to whatever is running in the container i.e. wal-g for postgres, etc.
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Use bind mounts instead of docker volumes. Then you just have normal directories to back up, the same as you would anything else.
In general, it's not a problem to back up files while the container is running. The exception to this is databases. To have reliable database backups, you need to stop the container (or quiesce/pause the database if it supports it) before backing up the raw database files (including SQLite).
save