docker 子网

当需要给容器分配指定 ip ，为避免ip 冲突，指定容器子网处理

• 创建 subnet 子网

docker network create --subnet 10.0.0.0/24 --gateway 10.0.0.1 subnet-test

docker network  ls
NETWORK ID     NAME          DRIVER    SCOPE
...
f582ecf297bc   subnet-test   bridge    local

• 给 busybox 容器指定子网

docker run -d --name busybox --net=subnet-test -it busybox:latest sleep infinite

docker network inspect subnet-test
[
    {
        "Name": "subnet-test",
        "Id": "f582ecf297bc589ef16e598c0fc2f0c5e69853d6741e63ccb2f49668aafb26c8",
        "Created": "2024-03-09T15:35:39.639503096+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.0.0.0/24",
                    "Gateway": "10.0.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "42d36208b6f4f8d6dce04b8686407ec1162cf0f678a42db9b29ffe325993a7d8": {
                "Name": "busybox",
                "EndpointID": "df945142982aa559fc9094d22fdcdf4a6fb04c141db61070cdda202d90615ce0",
                "MacAddress": "02:42:0a:00:00:02",
                "IPv4Address": "10.0.0.2/24",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

• 给容器指定 ip

 docker run -d --name busybox-01 --net subnet-test --ip 10.0.0.5 -it busybox:latest sleep infinite

• 断开容器网络

docker network disconnect subnet-test busybox-01

• 恢复容器网络

docker network connect subnet-test busybox-01

注意：busybox-01 ip 变为了：10.0.0.3

• 恢复容器网络并指定 ip

docker network connect --ip 10.0.0.5 subnet-test busybox-01

• 获取容器 ip

docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' busybox-01
10.0.0.5