? dns, dns_search
healthcheck
extends

networking
https://docs.docker.com/compose/networking/
https://docs.docker.com/compose/compose-file/#build

network-aliases
https://medium.com/@yani/two-way-link-with-docker-compose-8e774887be41
https://myshittycode.com/2017/06/01/docker-handling-circular-dependency-between-containers/

network-ambassador:
https://stackoverflow.com/questions/29307645/how-to-link-docker-container-to-each-other-with-docker-compose
https://docs.docker.com/engine/admin/ambassador_pattern_linking/
https://github.com/cpuguy83/docker-grand-ambassador

dns
https://docs.docker.com/compose/compose-file/#dns
https://docs.docker.com/compose/compose-file/#dns_search

2022
https://medium.com/techmormo/docker-network-drivers-overview-networking-in-docker-3-78308e0839c9
    ! mostly theoretical
2021
https://linuxhandbook.com/set-hostname-docker-compose/
????
https://runnable.com/docker/docker-compose-networking
https://runnable.com/docker/basic-docker-networking

samples
https://pastebin.com/gb4ZNYCg
https://forums.docker.com/t/option-network-mode-host-in-docker-compose-file-not-working-as-expected/51682
    mysrv:
      build:
        network: host


default:
      external:
          name: i-already-created-this
front:
    # use the bridge driver, but enable IPv6
    driver: bridge
    driver_opts:
        com.docker.network.enable_ipv6: "true"
    ipam:
        driver: default
        config:
            - subnet: 172.16.238.0/24
            gateway: 172.16.238.1
            - subnet: "2001:3984:3989::/64"
            gateway: "2001:3984:3989::1"

issue
failed to create network ...: Error response from daemon: could not find an available,
       non-overlapping IPv4 address pool among the defaults to assign to the network
    https://stackoverflow.com/questions/43720339/docker-error-could-not-find-an-available-non-overlapping-ipv4-address-pool-am/56136591#56136591
        Idea that You should specify what exactly subnet you want to use.
        In docker-compose.yml write:
            networks:
              default:
                driver: bridge
                ipam:
                  config:
                    - subnet: 172.16.57.0/24