14.Docker网络：容器互联之不同网络间的容器互联

╰+攻爆jí腚メ 2022-12-03 01:36 272阅读 0赞

【目录导览】  
[1.Docker入门：什么是Docker？如何安装Docker？][1.Docker_Docker_Docker]  
[2.Docker入门：Docker命令][2.Docker_Docker]  
[3.Docker实战：Docker部署Nginx][3.Docker_Docker_Nginx]  
[4.Docker实战：Docker部署Tomcat][4.Docker_Docker_Tomcat]  
[5.Docker实战：Docker部署MySQL][5.Docker_Docker_MySQL]  
[6.Docker镜像：什么是Docker镜像？Docker镜像加载原理？][6.Docker_Docker_Docker]  
[7.Docker容器：什么是Docker容器？][7.Docker_Docker]  
[8.Docker数据卷：数据交互、数据卷、数据卷容器][8.Docker]  
[9.Docker镜像制作：Commit和DockerFile][9.Docker_Commit_DockerFile]  
[10.Docker入门学习回顾小结][10.Docker]  
[11.Docker网络：基础原理&示例][11.Docker]  
[12.Docker网络：容器互联之–link][12.Docker_link]  
[13.Docker网络：容器互联之自定义网络][13.Docker]  
[14.Docker网络：容器互联之不同网络间的容器互联][14.Docker]

# 1.不同网络之间进行容器互联测试 #

`上一节中已经创建好一个自定义网络my_net，于是我们可以测试Docker默认的bridge网络和自定义my_net网络的连通性，也可以再创建一个自定义网络my_net-1，测试my_net和my_net-1之间的连通性，本节以两个自定义网络为例测试。`

#### step.1 再创建一个自定义网络my\_net-1 ####

# 创建自定义网络my_net-1
    docker network create --driver bridge --subnet 192.167.0.0/24 --gateway 192.167.0.1  my_net-1
    # 参数解释： 
    # --driver bridge 网络模式设置为桥接模式 
    # --subnet 192.167.0.0/24 子网划分
    # --gateway 192.167.0.1 设置网关
    # my_net-1 设置自定义网络的名字
    
    # 查看Docker的网络信息
    docker network ls
    
    # 内容如下：
    [root@iZ2zefjrz9szlt99tuu23fZ wy]# docker network ls
    NETWORK ID          NAME                DRIVER              SCOPE
    c5440000e49f        bridge              bridge              local
    c115f00b8471        host                host                local
    d3f68c147ecc        my_net              bridge              local
    4d12106e517b        my_net-1            bridge              local
    4fdfe488370c        none                null                local
    # 可以看到多了一个my_net-1网络

#### step.2 在my\_net-1中启动两个tomcat容器 ####

docker run -d -P --name tomcat-1-bak --net my_net-1 tomcat
    docker run -d -P --name tomcat-2-bak --net my_net-1 tomcat
    
    # 查看容器列表
    docker ps
    
    # 内容如下：
    [root@iZ2zefjrz9szlt99tuu23fZ wy]# docker ps
    CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                     NAMES
    d2e7ff385e64        tomcat              "catalina.sh run"   5 seconds ago       Up 4 seconds        0.0.0.0:32776->8080/tcp   tomcat-2-bak
    ca6f5c322e63        tomcat              "catalina.sh run"   6 seconds ago       Up 5 seconds        0.0.0.0:32775->8080/tcp   tomcat-1-bak
    e6538d8bb4a0        tomcat              "catalina.sh run"   36 minutes ago      Up 36 minutes       0.0.0.0:32774->8080/tcp   tomcat-2
    28aabfacad76        tomcat              "catalina.sh run"   39 minutes ago      Up 39 minutes       0.0.0.0:32773->8080/tcp   tomcat-3
    38a4932d7692        tomcat              "catalina.sh run"   About an hour ago   Up About an hour    0.0.0.0:32771->8080/tcp   tomcat-1

#### step.3 测试tomcat-1与tomcat-1-bak是否能网络互通 ####

docker exec -it tomcat-1 ping tomcat-1-bak
    
    # 内容如下：
    [root@iZ2zefjrz9szlt99tuu23fZ wy]# docker exec -it tomcat-1 ping tomcat-1-bak
    ping: tomcat-1-bak: Name or service not known

`可以看到，不同的网络之间不能直接通信`

# 2.如何实现不同网络之间容器互联？ #

## 2.1方法 ##

# 使用connect将A网络中的容器与B网络中的网关打通
    docker network connect my_net tomcat-1-bak
    
    # 再次测试tomcat-1与tomcat-1-bak之间的网络连通性
    docker exec -it tomcat-1 ping tomcat-1-bak
    
    # 内容如下：
    [root@iZ2zefjrz9szlt99tuu23fZ wy]# docker exec -it tomcat-1 ping tomcat-1-bak
    PING tomcat-1-bak (192.168.0.5) 56(84) bytes of data.
    64 bytes from tomcat-1-bak.my_net (192.168.0.5): icmp_seq=1 ttl=64 time=0.070 ms
    64 bytes from tomcat-1-bak.my_net (192.168.0.5): icmp_seq=2 ttl=64 time=0.061 ms

`可以看到，my_net网络中的tomcat-1容器与my_net-1网络中的tomcat—1-bak能通信了`

## 2.2原理 ##

# 此时查看一下my_net网络详情
    docker network inspect my_net
    
    # 内容如下：
    [root@iZ2zefjrz9szlt99tuu23fZ wy]# docker network inspect my_net
    [
        { 
            "Name": "my_net",
            "Id": "d3f68c147eccd5cfd1b82de45258cd16b6fea5b7ec964903c770ce5abb3b7448",
            "Created": "2020-08-31T18:13:33.323655501+08:00",
            "Scope": "local",
            "Driver": "bridge",
            "EnableIPv6": false,
            "IPAM": { 
                "Driver": "default",
                "Options": { },
                "Config": [
                    { 
                        "Subnet": "192.168.0.0/24",
                        "Gateway": "192.168.0.1"
                    }
                ]
            },
            "Internal": false,
            "Attachable": false,
            "Ingress": false,
            "ConfigFrom": { 
                "Network": ""
            },
            "ConfigOnly": false,
            "Containers": { 
                "28aabfacad7609261febb526cf4576fcfa4e5add9bb520f2176d9ee62d283215": { 
                    "Name": "tomcat-3",
                    "EndpointID": "ac656cb82c269c712d5f008b3b2f40409376bee965ac1b35a56b34d44814c5c1",
                    "MacAddress": "02:42:c0:a8:00:03",
                    "IPv4Address": "192.168.0.3/24",
                    "IPv6Address": ""
                },
                "38a4932d76927f1836fb471a6592612d1e17d771557284162dad8d75687ed085": { 
                    "Name": "tomcat-1",
                    "EndpointID": "7d367237c259f98086e27984d0b8b49464afcd8540a92bb78012d170ad422f2e",
                    "MacAddress": "02:42:c0:a8:00:02",
                    "IPv4Address": "192.168.0.2/24",
                    "IPv6Address": ""
                },
                "ca6f5c322e63ab7ded08899223cda9248a3c16c62ef158aa95c13284d2c2321e": { 
                    "Name": "tomcat-1-bak",
                    "EndpointID": "e8fe285ee474d3830b6f0eb035df168f18d7bb8e848a9c5cc81b134209527fd5",
                    "MacAddress": "02:42:c0:a8:00:05",
                    "IPv4Address": "192.168.0.5/24",
                    "IPv6Address": ""
                },
                "e6538d8bb4a062f2051eeb490da92e04ca916ded1039ff4ebf84dbb964d1bf4c": { 
                    "Name": "tomcat-2",
                    "EndpointID": "635851bc5d7d7b24bc78742d26a06e74edf0753d9b6904b937acd5bf161c60a1",
                    "MacAddress": "02:42:c0:a8:00:04",
                    "IPv4Address": "192.168.0.4/24",
                    "IPv6Address": ""
                }
            },
            "Options": { },
            "Labels": { }
        }
    ]

`可以看到tomcat-1-bak也在my_net网络中了，就像是tomcat-1-bak容器也基于my_net网络创建了一次。简单来说，一个容器两个ip地址。`

`对于tomcat-1-bak容器来说，是将一个容器加入到两个网络中`

`对于my_net网络来说，是给一个网络多加了一个网卡而已`

[1.Docker_Docker_Docker]: https://blog.csdn.net/w_y_x_y/article/details/107797739
[2.Docker_Docker]: https://blog.csdn.net/w_y_x_y/article/details/107797817
[3.Docker_Docker_Nginx]: https://blog.csdn.net/w_y_x_y/article/details/107797843
[4.Docker_Docker_Tomcat]: https://blog.csdn.net/w_y_x_y/article/details/107797859
[5.Docker_Docker_MySQL]: https://blog.csdn.net/w_y_x_y/article/details/108207365
[6.Docker_Docker_Docker]: https://blog.csdn.net/w_y_x_y/article/details/108207391
[7.Docker_Docker]: https://blog.csdn.net/w_y_x_y/article/details/108207413
[8.Docker]: https://blog.csdn.net/w_y_x_y/article/details/108207478
[9.Docker_Commit_DockerFile]: https://blog.csdn.net/w_y_x_y/article/details/108207516
[10.Docker]: https://blog.csdn.net/w_y_x_y/article/details/108207603
[11.Docker]: https://blog.csdn.net/w_y_x_y/article/details/108336126
[12.Docker_link]: https://blog.csdn.net/w_y_x_y/article/details/108336157
[13.Docker]: https://blog.csdn.net/w_y_x_y/article/details/108336332
[14.Docker]: https://blog.csdn.net/w_y_x_y/article/details/108336396