Docker volumes and overlay path on system partition?

Nixda · 9. März 2019

I was about to install a postgres in docker and wondered where my data would be stored. Postgres docker defaults to put it on the docker volume, so they would end up on the systems drive. I noticed that the docker overlay folders /var/lib/docker/... are on my OMV installation partition (and HDD).

I wondered if this makes sense or wouldn't be the volumes and overlays rather considered data for the storage dirve than system?

RPMan · 9. März 2019

You can change docker folder and use a shared folder of your choice in docker OMV plugin.

By default, your data will not be saved.
If you create a volume and use it for postgres it will store data in /var/lib/docker of your host OR in sharedFolderOfYourChoice (if you configure the plugin to change default docker folder)

What you sould do:

Bind mounts (also called volumes sometimes)-> Map an OMV host folder from your data drive to the container.

"The -v /my/own/datadir:/var/lib/postgresql/data part of the command mounts the /my/own/datadir directory from the underlying host system as /var/lib/postgresql/data inside the container, where PostgreSQL by default will write its data files."

Just read postgres docker image documentation: https://hub.docker.com/_/postgres

Nixda · 9. März 2019

I am aware how to change docker container paths using the -v option.

I was just wondering whether it would be more sensible in to have the internal container files rather on the storage data drives than on the OMV systems partition by default.

gderf · 9. März 2019

Mine are all on a data drive because the system drive is small.

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