Question on Admin API from a Docker Container

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I’m actually facing the same issue.

I’m running a docker container just to explore how to add new sites using the API but I haven’t been able to make it work. So far I’ve tested the 2.0.0-alpine, 2.1.0-beta.1, and 2.1.0-beta.1-alpine images and seeing different behavior.

Note that I am running the container in port 8181 instead of port 80.

Running docker:

$ docker run -d -p 8181:80 \
    -p 2019:2019 \
    -v $PWD/Caddyfile:/etc/caddy/Caddyfile \
    -v caddy_data:/data \
    caddy:2.1.0-beta.1-alpine

The contents of the Caddyfile:

{
    debug
    admin 0.0.0.0:2019
}

localhost:2016 {
	respond "Goodbye 2016!"
}

curl output:

curl http://localhost:2019/config -v                                                        ~/Development/CADDY/test
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 2019 (#0)
> GET /config HTTP/1.1
> Host: localhost:2019
> User-Agent: curl/7.64.1
> Accept: */*
> 
< HTTP/1.1 301 Moved Permanently
< Content-Type: text/html; charset=utf-8
< Location: /config/
< Date: Thu, 25 Jun 2020 05:27:46 GMT
< Content-Length: 43
< 
<a href="/config/">Moved Permanently</a>.

* Connection #0 to host localhost left intact
* Closing connection 0

If I curl http://localhost:8181:

*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8181 (#0)
> GET / HTTP/1.1
> Host: localhost:8181
> User-Agent: curl/7.64.1
> Accept: */*
> 
< HTTP/1.1 308 Permanent Redirect
< Connection: close
< Location: https://localhost:2016/
< Server: Caddy
< Date: Thu, 25 Jun 2020 05:30:30 GMT
< Content-Length: 0
< 
* Closing connection 0

Using the given Caddyfile with caddy:2.0.0-alpine I would get the following error message:

$ docker exec c62cd caddy reload --config /etc/caddy/Caddyfile --adapter caddyfile      ~/Development/CADDY/test
{"level":"info","ts":1593061662.197866,"msg":"using provided configuration","config_file":"/etc/caddy/Caddyfile","config_adapter":"caddyfile"}
reload: sending configuration to instance: caddy responded with error: HTTP 403: {"error":"host not allowed: 0.0.0.0:2019"}