Caddy in docker: Caddyfile config

Help
1

1. Caddy version (caddy version): v2.4.6 h1:HGkGICFGvyrodcqOOclHKfvJC0qTU7vny/7FhYp9hNw=

2. How I run Caddy: in a caddy-alpine docker container

a. System environment: Docker

b. Command:

docker run ...

c. Service/unit/compose file:

FROM caddy:alpine
ARG DOMAIN
COPY ./dist /usr/share/caddy
COPY Caddyfile /etc/caddy/Caddyfile
RUN sed -i "s/local.lan/${DOMAIN}/g" /etc/caddy/Caddyfile

d. My complete Caddyfile or JSON config:

local.lan {
    handle_path /api* {
        reverse_proxy g5api:3301
    }
    handle {
        root * /usr/share/caddy
        try_files {path} /index.html
        file_server
    }
}

3. The problem I’m having:

How to build the image without baking in the domain name on build time? I have not found anything useful yet, bc I have no idea how to formulate the search query.

4. Error messages and/or full log output:

The docker container is trying to start with my testing domain in production.

5. What I already tried:

I spent a few hours on this and considered it done, since I have not tested it properly. It worked on my testing setup, so I assumed everything worked as intended. The final domain in the caddyfile is replaced on container creation, not image build time.

2

You can use environment variables in your Caddyfile.

{$DOMAIN} {
	...
}

Just make sure you’re running the Docker container with that environment variable set, and it’ll be replaced at config-adapt time.

3

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