自定义网络

1、查看所有的docker网络

网络模式：

bridge     桥接  （docker默认）
none       不配置网络
host       和宿主机共享网络
container  容器内网络连通（用的少）

测试

我们直接启动的命令，默认是–net bridge，就是我们的docker0

docker run -d -P --name tomcat01 --net bridge tomcat

docker0的特点：
默认，域名不能访问，–link可以打通连接。

• 自定义一个网络

[root@iZwz9geewjuo2sogidqn50Z /]# docker network create --driver bridge --subnet 192.168.0.0/16 --gateway 192.168.0.1 mynet
843b151756ca18297b4bc5cf48c16636c409f8bb206a85e6b2fcd56036218ada
[root@iZwz9geewjuo2sogidqn50Z /]# docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
a84148e01491   bridge    bridge    local
02a82be95061   host      host      local
843b151756ca   mynet     bridge    local
ddfa76153018   none      null      local

查看网络信息：

[root@iZwz9geewjuo2sogidqn50Z /]# docker run -d -P --name tomcat-net01 --net mynet  tomcat
146ed1a2921f79dc724ec5716b82377325499f1fb9d2373c83bde796d642c14c
[root@iZwz9geewjuo2sogidqn50Z /]# docker run -d -P --name tomcat-net02 --net mynet  tomcat
3776acfad60682df7e3005d3b389d9d932a21e2b91fe24730d6ced93afa4d5cb
[root@iZwz9geewjuo2sogidqn50Z /]# docker network inspect mynet
[
    {
        "Name": "mynet",
        "Id": "843b151756ca18297b4bc5cf48c16636c409f8bb206a85e6b2fcd56036218ada",
        "Created": "2022-02-21T22:34:48.599496723+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "192.168.0.0/16",
                    "Gateway": "192.168.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "146ed1a2921f79dc724ec5716b82377325499f1fb9d2373c83bde796d642c14c": {
                "Name": "tomcat-net01",
                "EndpointID": "a575fd0fa0bada2920e8c6bd1a4c37228dbd0e00d2ff8b1267f8bb7f308c47a7",
                "MacAddress": "02:42:c0:a8:00:02",
                "IPv4Address": "192.168.0.2/16",
                "IPv6Address": ""
            },
            "3776acfad60682df7e3005d3b389d9d932a21e2b91fe24730d6ced93afa4d5cb": {
                "Name": "tomcat-net02",
                "EndpointID": "2ef979f86762e03a3b1de42a138257035c03e42ff678c4ea6f1ef3c9d8554c89",
                "MacAddress": "02:42:c0:a8:00:03",
                "IPv4Address": "192.168.0.3/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

再次测试ping

[root@iZwz9geewjuo2sogidqn50Z /]# docker exec -it tomcat-net01 /bin/bash
root@146ed1a2921f:/usr/local/tomcat# ping 192.168.0.3
PING 192.168.0.3 (192.168.0.3) 56(84) bytes of data.
64 bytes from 192.168.0.3: icmp_seq=1 ttl=64 time=0.095 ms
64 bytes from 192.168.0.3: icmp_seq=2 ttl=64 time=0.082 ms
64 bytes from 192.168.0.3: icmp_seq=3 ttl=64 time=0.079 ms

不使用–link也可以ping名字

[root@iZwz9geewjuo2sogidqn50Z /]# docker exec -it tomcat-net01 /bin/bash
root@146ed1a2921f:/usr/local/tomcat# ping tomcat-net02
PING tomcat-net02 (192.168.0.3) 56(84) bytes of data.
64 bytes from tomcat-net02.mynet (192.168.0.3): icmp_seq=1 ttl=64 time=0.073 ms
64 bytes from tomcat-net02.mynet (192.168.0.3): icmp_seq=2 ttl=64 time=0.080 ms
64 bytes from tomcat-net02.mynet (192.168.0.3): icmp_seq=3 ttl=64 time=0.102 ms
64 bytes from tomcat-net02.mynet (192.168.0.3): icmp_seq=4 ttl=64 time=0.090 ms

好处：
redis:不同的集群使用不同的网络，保证集群是安全和健康的
mysql:不同的集群使用不同的网络，保证集群是安全和健康的

网络连通

测试打通tomcat01 -----mynet

#启动tomcat01
[root@iZwz9geewjuo2sogidqn50Z /]# docker run -d -P --name tomcat01 tomcat
2ef7b27090688b363cbd8b0240f2fa14b90f45b5a637b78ea3650fec69f973bd
#启动tomcat02
[root@iZwz9geewjuo2sogidqn50Z /]# docker run -d -P --name tomcat02 tomcat
47adc17f6d7918db094b95cbd8a8f67a3234c6fa87c9e05543a12d47ef86a632
[root@iZwz9geewjuo2sogidqn50Z /]# docker ps
CONTAINER ID   IMAGE     COMMAND             CREATED          STATUS          PORTS                                         NAMES
47adc17f6d79   tomcat    "catalina.sh run"   11 seconds ago   Up 10 seconds   0.0.0.0:49158->8080/tcp, :::49158->8080/tcp   tomcat02
2ef7b2709068   tomcat    "catalina.sh run"   23 seconds ago   Up 22 seconds   0.0.0.0:49157->8080/tcp, :::49157->8080/tcp   tomcat01
3776acfad606   tomcat    "catalina.sh run"   31 minutes ago   Up 31 minutes   0.0.0.0:49156->8080/tcp, :::49156->8080/tcp   tomcat-net02
146ed1a2921f   tomcat    "catalina.sh run"   31 minutes ago   Up 31 minutes   0.0.0.0:49155->8080/tcp, :::49155->8080/tcp   tomcat-net01

#connect mynet和tomcat01
[root@iZwz9geewjuo2sogidqn50Z /]# docker network connect mynet tomcat01

查看如下：

[root@iZwz9geewjuo2sogidqn50Z /]# docker network inspect

连通之后，就是将tomcat01放在了mynet网络下。
一个容器两个ip！

[root@iZwz9geewjuo2sogidqn50Z /]# docker exec -it tomcat01 /bin/bash
root@2ef7b2709068:/usr/local/tomcat# ping tomcat-net01
PING tomcat-net01 (192.168.0.2) 56(84) bytes of data.
64 bytes from tomcat-net01.mynet (192.168.0.2): icmp_seq=1 ttl=64 time=0.089 ms
64 bytes from tomcat-net01.mynet (192.168.0.2): icmp_seq=2 ttl=64 time=0.080 ms
64 bytes from tomcat-net01.mynet (192.168.0.2): icmp_seq=3 ttl=64 time=0.077 ms

tomcat01打通tomcat-net01！

假设要跨网络操作，就需要使用docker network connect连通！