dockercompose设置系统环境变量（使用docker compose搭建consul集群环境的例子）

version: '2'
networks:
  byfn:
 
services:
  consul1:
    image: consul
    container_name: node1
    command: agent -server -bootstrap-expect=3 -node=node1 -bind=0.0.0.0 -client=0.0.0.0 -datacenter=dc1
    networks:
      - byfn
 
  consul2:
    image: consul
    container_name: node2
    command: agent -server -retry-join=node1 -node=node2 -bind=0.0.0.0 -client=0.0.0.0 -datacenter=dc1
    depends_on:
        - consul1
    networks:
      - byfn
 
  consul3:
    image: consul
    container_name: node3
    command: agent -server -retry-join=node1 -node=node3 -bind=0.0.0.0 -client=0.0.0.0 -datacenter=dc1
    depends_on:
        - consul1
    networks:
      - byfn
 
  consul4:
    image: consul
    container_name: node4
    command: agent -retry-join=node1 -node=ndoe4 -bind=0.0.0.0 -client=0.0.0.0 -datacenter=dc1 -ui 
    ports:
      - 8500:8500
    depends_on:
        - consul2
        - consul3
    networks:
      - byfn

$ docker-compose up
$ docker exec -t node1 consul members
Node   Address          Status  Type    Build  Protocol  DC   Segment
node1  172.21.0.2:8301  alive   server  1.4.0  2         dc1  <all>
node2  172.21.0.4:8301  alive   server  1.4.0  2         dc1  <all>
node3  172.21.0.3:8301  alive   server  1.4.0  2         dc1  <all>
ndoe4  172.21.0.5:8301  alive   client  1.4.0  2         dc1  <default>

spring:
  application:
    name: cloud-payment-service
  ####consul注册中心地址
  cloud:
    consul:
      enabled: true
      host: 127.0.0.1
      port: 8500
      discovery:
        hostname: 127.0.0.1
        prefer-ip-address: true
        service-name: ${spring.application.name}
        #healthCheckInterval: 15s
        instance-id: ${spring.application.name}-8002
        enabled: true

$ docker exec -t node4 consul kv put foo "Hello foo"
$ docker exec -t node4 consul kv put foo/foo1 "Hello foo1"
$ docker exec -t node4 consul kv put foo/foo2 "Hello foo2"
$ docker exec -t node4 consul kv put foo/foo21 "Hello foo21"
$ docker exec -t node4 consul kv get foo
Hello foo
$ docker exec -t node4 consul kv get -detailed foo/foo1
CreateIndex      124
Flags            0
Key              foo/foo1
LockIndex        0
ModifyIndex      124
Session          -
Value            Hello foo1
$ docker exec -t node4 consul kv get -keys -separator="" foo
foo
foo/foo1
foo/foo2
foo/foo2/foo21
$ docker exec -t node4 consul kv get not-a-real-key
Error! No key exists at: not-a-real-key