CoreDNS docker

CoreDNS を dockerで動かす

services:
  coredns:
    image: coredns/coredns:1.10.1
    container_name: coredns
    configs:
      - source: coredns
        target: /Corefile
    networks:
      core-dns:
        ipv4_address: 172.16.238.10

  alpine:
    image: alpine:3.18
    tty: true
    networks:
      core-dns:
    dns:
      - 172.16.238.10

configs:
  coredns:
    file: ./Corefile

networks:
  core-dns:
    ipam:
      driver: default
      config:
        - subnet: "172.16.238.0/28"

Corefile

Corefile

. {
    whoami
    errors
    log . "{proto} {remote} Request: {name} {type} {>id}"

    template IN A app.example.com {
        match "^([^\.]+)\.app\.example\.com\.$"
        answer "{{ index .Match 1 }}.app.example.com. IN A 192.168.10.10"
        fallthrough
    }

    hosts {
        192.168.10.11 a.example.com
        192.168.10.12 b.example.com
        fallthrough
    }

    forward . 1.1.1.1 8.8.8.8
    reload
}