docker network create で割り当てる IP アドレスを固定する

$ docker network create --driver=bridge --subnet=10.20.0.0/20 --ip-range=10.20.2.0/24 --gateway=10.20.3.1 network-name

$ docker network inspect network-name
[
    {
        "Name": "network-name",
        "Id": "69244ead33f8c228855ff4e8a6cb40a0f38e9037c797b149b8cfbf1b7bf2b958",
        "Created": "2024-02-19T06:04:18.969095477Z",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.20.0.0/22",
                    "IPRange": "10.20.2.0/24",
                    "Gateway": "10.20.3.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {},
        "Options": {},
        "Labels": {}
    }
]
$ ip addr
  ...(略)...
65: br-69244ead33f8: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:21:6e:a2:5f brd ff:ff:ff:ff:ff:ff
    inet 10.20.3.1/22 brd 10.20.3.255 scope global br-69244ead33f8
       valid_lft forever preferred_lft forever

$ docker run --network=network-name --name cont-name -it ubuntu:latest
root@60c0ae5739c9:/# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.20.2.0  netmask 255.255.252.0  broadcast 10.20.3.255
        ether 02:42:0a:14:02:00  txqueuelen 0  (Ethernet)
        RX packets 6910  bytes 31407261 (31.4 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4372  bytes 293851 (293.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ docker network inspect network-name
[
    {
        "Name": "network-name",
        "Id": "69244ead33f8c228855ff4e8a6cb40a0f38e9037c797b149b8cfbf1b7bf2b958",
        "Created": "2024-02-19T06:04:18.969095477Z",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.20.0.0/22",
                    "IPRange": "10.20.2.0/24",
                    "Gateway": "10.20.3.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "60c0ae5739c9c408d3d7475853ead42e90102c693b3bd7101e957ab2cbb9e284": {
                "Name": "cont-name",
                "EndpointID": "95d9d55a494686b108eff346a664a7c80bf9a81745c7908a2adb1418e79bf88c",
                "MacAddress": "02:42:0a:14:02:00",
                "IPv4Address": "10.20.2.0/22",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]