docker network的alias可以理解为同一个网络下的ip，同一个网络的容器可以通过alias调用目标容器：

比如容器A的别名是aliasA，那么容器B要调用容器A的一个http端口，可以这样：

http://aliasA:端口号

docker-compose会默认将当前的容器名称作为network的alias，如果想设置其他alias：

  test-cloud-nacos:
    image: nacos/nacos-server:latest
    environment:
      - JVM_XMS=1024m
      - JVM_XMX=2048m
      - MODE=standalone
      - SPRING_DATASOURCE_PLATFORM=derby
    ports: 
      - 8748:8848
      - 9748:9848
      - 9749:9849
    restart: always
    networks:
      net_name:
        ipv4_address: ${intple_cloud_nacos_default:-124.81.62.30}
        aliases:
          - test-cloud-nacos-2

通过docker inspect test-test-cloud-nacos-1 可以查看到最终的结果：

 "Networks": {
                "net_name": {
                    "IPAMConfig": {
                        "IPv4Address": "124.81.62.30"
                    },
                    "Links": null,
                    "Aliases": [
                        "test-test-cloud-nacos-1",
                        "test-cloud-nacos",
                        "test-cloud-haha",
                        "70b0732f2d9a"
                    ],
                    "NetworkID": "0ff90e8a8bd8d8fc350f8db0a8c7c813cd522db619a079ddcb61affa7e294704",
                    "EndpointID": "6871010aacec518a5248dd634fae761ba747607101230c69523e89eec771d86d",
                    "Gateway": "124.81.62.1",
                    "IPAddress": "124.81.62.30",
                    "IPPrefixLen": 24,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:7c:51:3e:1e",
                    "DriverOpts": null
                }
            }