Portainer - how to expose the Caddyfile in a mount?

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1

I am using Docker Compose in Portainer and want to use the Caddyfile (/etc/caddy/Caddyfile) in a persistent data volume I’ve created as:

volumes:
  caddy_data:
    name: caddy_data
    external: true

I’ve tried this, but it doesn’t seem to see the Caddyfile.

     volumes:
      - caddy_data:/etc/caddy/Caddyfile

What’s the best way to expose this Caddyfile so it can be backed up and edited even when the container image is updated?

2

That’s definitely wrong. You need the data mount to be /data to persist Caddy’s certs and keys. Config should not go in there.

I don’t really understand what you’re trying to do here. What’s the problem with mounting your Caddyfile normally? Keep Caddy Running — Caddy Documentation

3

I’m aware this is wrong. What I’m trying to do is mount the Caddyfile somewhere I can edit it and make it persist outside of the Caddy image.

    volumes:
      - /mnt/caddy/Caddyfile:/etc/caddy/Caddyfile

I am having trouble getting this to mount. I am runing Docker/Portainer in a VM, and using Docker Compose within Portainer. It isn’t able to access any of these mountpoints I’ve tried, but works fine with the /data folder being mapped to a persistent volume. I thought there was a way to also put the Caddyfile into that persistent storage volume so I can update it and it persists.

4

Where are you storing your docker-compose.yml file? Put your Caddyfile right next to that, then do - ./Caddyfile:/etc/caddy/Caddyfile

1 Like
5

I’ve tried that. Portainer itself keeps the docker-compose.yml files in its own folders (portainer/compose/###/). I’ve placed the Caddyfile there next to the docker-compose and it throws the same error.

container process: error during container init: error mounting "/data/compose/186/Caddyfile" to rootfs at "/etc/caddy/Caddyfile": mount /data/compose/186/Caddyfile:/etc/caddy/Caddyfile (via /proc/self/fd/6), flags: 0x5000: not a directory: unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type
6

Thanks for the assistance. I just got it to work using the following path:

- /var/lib/docker/volumes/caddy_data/_data/Caddyfile:/etc/caddy/Caddyfile

This places the file in the persistent volume as desired.

7

That’s really weird. You don’t need to put the file in a volume on the host. I’m confused.

1 Like
8

How would you handle this? Is there a better way?

9

As Keep Caddy Running — Caddy Documentation says, literally put the Caddyfile and docker-compose.yml files next to eachother. I’m not sure why that would be a problem. Both are config and should be treated as such. Config is not data, it doesn’t go in a data volume.

1 Like
10

This is probably the case outside of Portainer, but within Portainer paths are working differently. Please direct me to a working Portainer compose file for Caddy that addresses this if possible. I use data volumes for all sorts of purposes, and keeping some specific config files in them for a specific container makes some tasks simpler.

11

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