docker-compose.yml

x-variables:
  flag_initial_cluster_token: &flag_initial_cluster_token "--initial-cluster-token=mys3cr3ttok3n"
  common_settings: &common_settings
    image: quay.io/coreos/etcd:v3.5.13
    entrypoint: /usr/local/bin/etcd
    ports:
      - 2379

services:
  go-app:
    build: .
    ports:
      - 8080
    deploy:
      mode: replicated
      replicas: 3
  etcd-1:
    container_name: etcd-1
    <<: *common_settings
    command:
      - "--name=etcd-1"
      - "--initial-advertise-peer-urls=http://etcd-1:2380"
      - "--listen-peer-urls=http://0.0.0.0:2380"
      - "--listen-client-urls=http://0.0.0.0:2379"
      - "--advertise-client-urls=http://etcd-1:2379"
      - "--heartbeat-interval=250"
      - "--election-timeout=1250"
      - "--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380"
      - "--initial-cluster-state=new"
      - *flag_initial_cluster_token
    volumes:
      - etcd1:/etcd_data

  etcd-2:
    container_name: etcd-2
    <<: *common_settings
    command:
      - "--name=etcd-2"
      - "--initial-advertise-peer-urls=http://etcd-2:2380"
      - "--listen-peer-urls=http://0.0.0.0:2380"
      - "--listen-client-urls=http://0.0.0.0:2379"
      - "--advertise-client-urls=http://etcd-2:2379"
      - "--heartbeat-interval=250"
      - "--election-timeout=1250"
      - "--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380"
      - "--initial-cluster-state=new"
      - *flag_initial_cluster_token
    volumes:
      - etcd2:/etcd_data

  etcd-3:
    container_name: etcd-3
    <<: *common_settings
    command:
      - "--name=etcd-3"
      - "--initial-advertise-peer-urls=http://etcd-3:2380"
      - "--listen-peer-urls=http://0.0.0.0:2380"
      - "--listen-client-urls=http://0.0.0.0:2379"
      - "--advertise-client-urls=http://etcd-3:2379"
      - "--heartbeat-interval=250"
      - "--election-timeout=1250"
      - "--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380"
      - "--initial-cluster-state=new"
      - *flag_initial_cluster_token
    volumes:
      - etcd3:/etcd_data

volumes:
  etcd1:
  etcd2:
  etcd3: