Can't connect to caddy API via docker-compose hostname service

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1

Hey everyone! I have a problem with call caddy API via docker-compose hostnames (servicename), I have added config to Caddyfile for exposing caddy API on 0.0.0.0:2019 IP, but still can’t connect from another container in the same docker network like “curl http://caddy:2019/config/ | jq”

2

Welcome Myron –

Can you please fill out the help template so we can help you?

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3

1. Caddy version (caddy version):

v2.3.0 h1:fnrqJLa3G5vfxcxmOH/+kJOcunPLhSBnjgIvjXV/QTA=

2. How I run Caddy:

Caddy is running on docker container (docker-compose)

a. System environment:

Docker version 20.10.3, build 48d30b5

b. Command:

I use docker-compose command

c. Service/unit/compose file:

  caddy:
    image: caddy:latest
    restart: unless-stopped
    ports:
      - "80:80"
      - "443:443"
    expose:
      - 2019
    volumes:
      - /root/Caddyfile:/etc/caddy/Caddyfile
      - /root/.caddy/:/data
      - caddy_config:/config
    network_mode: bridge

volumes:
  caddy_config:

d. My complete Caddyfile or JSON config:

{
  admin 0.0.0.0:2019 {
  }
}


frontend.domain.com {
    reverse_proxy * http://frontend:9006 {
    }
}

backend.domain.com {
    reverse_proxy * http://backend:9005 {
    }
}

3. The problem I’m having:

I deploy caddy with my 2 containers, that have to connect to caddy API, for generation subdomains for users, but the backend can’t connect to caddy API via docker-compose service names, I’m getting an error like curl: (6) Could not resolve host: caddy, but if I try to curl from caddy container to backend I’m getting 200 response via curl http://backend:9005/

4. Error messages and/or full log output:

curl: (6) Could not resolve host: caddy

5. What I already tried:

I tried to connect through the hostname hash of the caddy container and got a response of 200, but in my opinion, it is not convenient to look for a hostname hash every time and connect through it

6. Links to relevant resources:

4

That’s strange. Maybe if you specify container_name:, Docker’s DNS will resolve that hostname?

Ultimately that’s a Docker issue rather than a Caddy issue. I’ve not had that problem before, so I don’t know what the cause could be.

5

Yea, u were right, have to specify container_name:, then calls with hostname works, but it’s so strange. Thnx

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