Is it possible to customize mount point with volume?

[charnould]

Currently, if your mrsk.yaml contains...

volumes:
  - 'database:/app/database'

... it creates a volume:
code-available at app/database,
but located at /var/lib/docker/volumes/database/_data (default Docker location for volume).

Using Hetzner, I'd like to use their OWN Volume , kind of mini-S3.
After having configured one, this Hetzner Volume is available at /mnt/...

Is it possible with mrsk to configure the mount point?
In Docker-word it should be (?) a bind-mount (?)

Thanks.

[ncompute]

@charnould - Got this working but it could be improved.

On your host (replace path based on your requirements):

$ mkdir /root/data && chmod 777 /root/data

Then in your deploy.yml file:

volumes:
  - "/root/data:/rails/storage/db"

Note: Looks like this will only work with absolute host paths:

kamal/lib/kamal/configuration/volume.rb

Lines 15 to 21 in 83a2d52

	def host_path_for_docker_volume
	if Pathname.new(host_path).absolute?
	host_path
	else
	File.join "$(pwd)", host_path
	end
	end

[abratashov]

Yes, it works! But I'm curious why this setting isn't present in the default generated deploy.yml for the folder storage:

$ sudo mkdir /data && sudo chmod 777 /data

volumes:
  - "/data/storage:/rails/storage"

[acidtib]

Kamal is a bit framework-agnostic. Not every deployment is going to be for Rails. That is why the volume definition is not set as default for /rails/storage on kamal init.

[abratashov]

Oh, indeed! I totally forgot about it :)
But in any case, in the future hypothetical kamal-rails gem, the comments about volumes are vital for any web app to upload/download data backup, hope it will be added to the default deploy.yml:

# ...
# To restore or make a data backup, you can link your host's folder to the app of docker container:
# volumes:
#   - "/data/storage:/rails/storage"
# ...

or possibly something like this (I'm not sure if it works because I haven't tested it yet):

# accessories:
#   web:
#     directories:
#       - data/storage:/rails/storage