099、如何访问Service （Swarm06）-白红宇

099、如何访问Service （Swarm06）

阅读量：6236 次

发布时间：2019-06-22

本文共 2772 字，大约阅读时间需要 9 分钟。

参考

前面已经学习了如何部署Service吗，也验证了swarm的failover特性，下面我们要学习的是如何访问Service。

下面我们删除之前的Service，重新部署一个Service

内部访问Service

root@host03:~# docker service  rm web_server    #    删除之前的Service web_server
      web_server 
root@host03:~# docker service create --name web_server --replicas=2 httpd    #    创建新的Service，并设置副本数为2
      1hgm1w94dvuxlbsen9lmsefvz 
      overall progress: 2 out of 2 tasks 
      1/2: running   [==================================================>] 
      2/2: running   [==================================================>] 
      verify: Service converged 
root@host03:~# docker service ps web_server    #    查看新建Service 容器分布情况
      ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS 
      s4o9mtd8xvqe        web_server.1        httpd:latest        host01              Running             Running 12 seconds ago                        
      kq66bz6omujf        web_server.2        httpd:latest        host02              Running             Running 12 seconds ago 
root@host01:~# docker inspect web_server.1.s4o9mtd8xvqe8yqcnbyuom26f | jq .[0].NetworkSettings    #    查看某容器内部IP地址
      { 
        "Bridge": "", 
        "SandboxID": "407fde9cdf85507b7e5c635ea3313e41e6ef54da9242837e292526cf0398000d", 
        "HairpinMode": false, 
        "LinkLocalIPv6Address": "", 
        "LinkLocalIPv6PrefixLen": 0, 
        "Ports": { 
          "80/tcp": null 
        }, 
        "SandboxKey": "/var/run/docker/netns/407fde9cdf85", 
        "SecondaryIPAddresses": null, 
        "SecondaryIPv6Addresses": null, 
        "EndpointID": "a10f1d6f81f492f8b7911997a0837d499f8bbc733c274c955e479c0fedeec433", 
        "Gateway": "172.17.0.1", 
        "GlobalIPv6Address": "", 
        "GlobalIPv6PrefixLen": 0, 
        "IPAddress": "172.17.0.2", 
        "IPPrefixLen": 16, 
        "IPv6Gateway": "", 
        "MacAddress": "02:42:ac:11:00:02", 
        "Networks": { 
          "bridge": { 
            "IPAMConfig": null, 
            "Links": null, 
            "Aliases": null, 
            "NetworkID": "d4b0862f06c8f2f16802b3fe9175743e7afdc2396322ff19e656bebca4d9a940", 
            "EndpointID": "a10f1d6f81f492f8b7911997a0837d499f8bbc733c274c955e479c0fedeec433", 
            "Gateway": "172.17.0.1", 
             "IPAddress": "172.17.0.2", 
            "IPPrefixLen": 16, 
            "IPv6Gateway": "", 
            "GlobalIPv6Address": "", 
            "GlobalIPv6PrefixLen": 0, 
            "MacAddress": "02:42:ac:11:00:02", 
            "DriverOpts": null 
          } 
        } 
      } 
root@host01:~# curl http://172.17.0.2    #    内部访问验证
      <html><body><h1>It works!</h1></body></html> 

外部访问Service

root@host03:~# docker service update --publish-add 8080:80 web_server    #    更新Service配置，添加端口映射，将容器的80端口映射到host的8080端口
      web_server 
      overall progress: 2 out of 2 tasks 
      1/2: running   [==================================================>] 
      2/2: running   [==================================================>] 
      verify: Service converged 
root@host03:~# curl http://10.12.31.211:8080    #    访问 host01 IP 验证外部访问
      <html><body><h1>It works!</h1></body></html> 
root@host03:~# curl http://10.12.31.212:8080    #    访问 host02 IP 验证外部访问
      <html><body><h1>It works!</h1></body></html> 
root@host03:~# curl http://10.12.31.213:8080    #    访问 host03 IP 验证外部访问（host03上没有容器，也可以访问成功，这是swarm的一个特性 routing mesh）
      <html><body><h1>It works!</h1></body></html> 