[How do I | Can I] mount a path within a volume?

[Shadow8472]

I use containerized Caddy in my homelab. One container insist on HTTPS for webUI access. I managed to establish through creative use of mounts, but I'd prefer to use one certs.volume for Caddy to mount, but I'd ideally like to mount the relevant certificate for each service.

For example: I have Crafty Controller as a Minecraft server. I want to mount its self-signed certificate in certs.volume/Crafty/ and Vaultwarden at certs.volume/Vaultwarden/, but not allow the two to see each others' stuff.

I suppose I could just make a volume each, but that feels a bit tacky for my use case; I'd rather just mount the entire volume everywhere.

[eriksjolund]

Check out the subpath option.

Here is a minimal example

$ podman volume create vol1
vol1
$ podman run --rm --mount type=volume,source=vol1,target=/mnt docker.io/library/alpine sh -c "mkdir /mnt/dir ; touch /mnt/dir/file"
$ podman run --rm --mount type=volume,source=vol1,target=/mnt,subpath=/dir docker.io/library/alpine sh -c "ls /mnt"
file
$ 

Quote from podman run man page

subpath: Mount only a specific subpath within the volume, instead of the whole volume.