docker-compose.yaml

version: '3.7'
services:
  # Servers on the consul cluster
  server-1:
    image: consul
    command: consul agent -server -bootstrap-expect=3 -data-dir /tmp/consul -node=server-1

  server-2:
    image: consul
    command: consul agent -server -bootstrap-expect=3 -data-dir /tmp/consul -retry-join=server-1 -node=server-2

  server-3:
    image: consul
    command: consul agent -server -bootstrap-expect=3 -data-dir /tmp/consul -retry-join=server-1 -node=server-3

  # Consul UI is exposed here.
  consul-ui:
    image: consul
    command: consul agent -data-dir /tmp/consul -retry-join=server-1 -client 0.0.0.0 -ui -node=client-ui
    ports:
      - 8500:8500

  hello_server:
    image: server
    depends_on:
      - server-1
      - server-2
      - server-3
      - consul-ui
      - load-balancer
    expose:
      - 7777
    environment:
      - CONSUL_SERVER=server-1
      - APP_NAME=hello_server
      - APP_PORT=7777
      - CONSUL_PORT=8500
      - TAGS=hello_server,grpc_server

  load-balancer:
    image: lb
    depends_on:
      - server-1
      - server-2
      - server-3
      - consul-ui
    environment:
      - CONSUL_SERVER=server-1
      - APP_NAME=nginx
      - APP_PORT=5000
      - CONSUL_PORT=8500
      - TAGS=nginx
    ports:
      - 5000:5000