Consul Docker

consul-service.yml

version: '3.1'

#customise this with options from
#https://www.consul.io/docs/agent/options.html

services:

  seed:
    hostname: seed
    image: consul:0.8.0
    deploy:
      restart_policy:
        condition: none  #we do not want this to be restarted on timeout (see entrypoint options below)
      replicas: 1
      placement:
        constraints:
          - "engine.labels.access == temp"
          - "engine.labels.access != consul"
    environment:
      - "CONSUL_LOCAL_CONFIG={\"disable_update_check\": true}"
      - "CONSUL_BIND_INTERFACE=eth0"
    entrypoint:
      - timeout     #this seed fires up the cluster after which it is no longer needed
      - -sTERM      #this is the same signal as docker would send on a scale down / stop
      - -t300       #terminate after 5 mins
      - consul
      - agent
      - -server
      - -bootstrap-expect=5
      - -data-dir=/tmp/consuldata
      - -bind={{ GetInterfaceIP "eth0" }}
    networks:
      - "consul"

  cluster:
    image: consul:0.8.0
    depends_on:
      - "seed"
    deploy:
      mode: global                                      ##this will deploy to all nodes that
      placement:
        constraints:
          - "engine.labels.access == consul"            ##have the consul label
          - "engine.labels.access != temp"
    environment:
      - "CONSUL_LOCAL_CONFIG={\"disable_update_check\": true}"
      - "CONSUL_BIND_INTERFACE=eth0"
      - "CONSUL_HTTP_ADDR=0.0.0.0"
    entrypoint:
      - consul
      - agent
      - -server
      - -data-dir=/tmp/consuldata
      - -bind={{ GetInterfaceIP "eth0" }}
      - -client=0.0.0.0
      - -retry-join=seed:8301
      - -ui                                              ##assuming you want the UI on
    networks:
      - "consul"
    ports:
      - "8500:8500"
      - "8600:8600"

networks:
  consul:
    driver: overlay

docker-compose.yml

version: "3.1"

services:
  consul:
    image: consul
    environment:
      - 'CONSUL_LOCAL_CONFIG={"acl_datacenter":"dc1","acl_default_policy":"deny","acl_down_policy":"extend-cache","acl_master_token":"the_one_ring","bootstrap_expect":1,"datacenter":"dc1","data_dir":"/usr/local/bin/consul.d/data","server":true}'
    ports:
      - "8400:8400"
      - "8500:8500/tcp"
      - "8600:53/udp"
    # entrypoint:
    #   - agent
    #   - -server
    #   - -bind=127.0.0.1
    #   - -client=0.0.0.0
    #   - -ui
    command: "agent -server -bind=127.0.0.1 -client=0.0.0.0 -ui"