Multiple static IP - docker-compose

Question

This is my first post so: Hello:)

I want to have a container connected to two docker.networks on the same host. I want to have static IP's for each.network. Networks are already created. I was able to set a static IP with one.network

https://pastebin.com/jnpFHSND

version: '3.3'
services:
    homer:
        ports:
            - '7070:8080'
        volumes:
            - '/docker/homertest:/www/assets'
        restart: always
        hostname: homer-test
        networks:
          #default
            #ipv4_address: 172.19.0.222
          frontend:
            ipv4_address: 172.18.0.111
          # - kuma:
          #     ipv4_address: 172.20.0.222
          #- smtp
        container_name: homer
        image: 'b4bz/homer:latest'
networks:
  default:
    external:
      name: nginx-proxy-manager_default
  frontend:
    external:
      name: portainer_default
  kuma:
    external:
      name: uptime-kuma_default
  smtp:
    external:
      name: smtp-relay_default

but with two or more

https://pastebin.com/axSaa0iJ

version: '3.3'
services:
    homer:
        ports:
            - '7070:8080'
        volumes:
            - '/docker/homertest:/www/assets'
        restart: always
        hostname: homer-test
        networks:
          #default
            #ipv4_address: 172.19.0.222
          - frontend:
              ipv4_address: 172.18.0.111
          - kuma:
              ipv4_address: 172.20.0.222
          #- smtp
        container_name: homer
        image: 'b4bz/homer:latest'
networks:
  default:
    external:
      name: nginx-proxy-manager_default
  frontend:
    external:
      name: portainer_default
  kuma:
    external:
      name: uptime-kuma_default
  smtp:
    external:
      name: smtp-relay_default

I get an error

services.homer.networks contains {"frontend": {"ipv4_address": "172.18.0.111"}}, which is an invalid type, it should be a string

What am I doing wrong?

Answer 1

You are using a mapping in the first version, but in the second one you are using a list. Keep it a mapping.

networks:
  frontend:
    ipv4_address: 172.18.0.111
  kuma:
    ipv4_address: 172.20.0.222

You can also review the json schema for compose files .

---

What do I mean by list and mapping?

list:
  - a
  - b

mapping:
  a:
  b:

This would translate to json in like the below, which may make it more clear:

{
   "list": [
      "a",
      "b"
   ],
   "mapping": {
      "a": null,
      "b": null
   }
}

---

Answer 2

Simply remove the hyphens used in front of frontend and kuma. This will make it mapping from list and it will work.