特定のコンテナが接続しているネットワークは、docker inspectコマンドで確認できます。
このコマンドは、コンテナ、イメージ、ネットワークなど、Dockerオブジェクトに関する詳細な情報をJSON形式で出力します。
１．対象コンテナ名 または 対象コンテナID の確認
・docker network ls
２．対象コンテナのネットワーク情報 の確認
（１）ネットワーク情報全ての表示
・docker inspect <対象コンテナ名 または 対象コンテナID>
実例：
docker inspect 7af1f689e956
※この結果は非常に長く分り難いです。（口述手順により必要個所表示ができます）
C:\Users\lemon>docker inspect 7af1f689e956
[
{
"Id": "7af1f689e956bc324fc45db6a77bfd79118c7d57712d20b7ef5ffbeb2136dafe",
"Created": "2023-09-10T18:39:10.602476821Z",
"Path": "/bin/bash",
"Args": [],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 9060,
"ExitCode": 0,
"Error": "",
"StartedAt": "2023-09-10T18:39:11.678620165Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:a411d977f740dfdb37e3dc7ff751bed5ca17c4862f3bd16a9e4fa730b8edc0ba",
"ResolvConfPath": "/var/lib/docker/containers/7af1f689e956bc324fc45db6a77bfd79118c7d57712d20b7ef5ffbeb2136dafe/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/7af1f689e956bc324fc45db6a77bfd79118c7d57712d20b7ef5ffbeb2136dafe/hostname",
"HostsPath": "/var/lib/docker/containers/7af1f689e956bc324fc45db6a77bfd79118c7d57712d20b7ef5ffbeb2136dafe/hosts",
"LogPath": "/var/lib/docker/containers/7af1f689e956bc324fc45db6a77bfd79118c7d57712d20b7ef5ffbeb2136dafe/7af1f689e956bc324fc45db6a77bfd79118c7d57712d20b7ef5ffbeb2136dafe-json.log",
"Name": "/anaconda-dockerfile-gui-container",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": [
"f1d86856996fd3099f1f5b7f820e94014bcb6d67504408b2138fdd9e7650b803",
"782b4a571856c10f6191a86cdc7ff8161239df70174c541f7ea77070580f862e",
"580a4c4f76d150b0234545d3b1f25ed40c5ca83173771c0a508a475749e5e8cf",
"e1026dc5e49842618d8841a0551814f528ea1b12ad3eb1264fee25f2b02609a7",
"1da4b0dcfde24a1abac6a22165c5c4cac6ff2b98fd105a6d6f44c6847488d489"
],
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {
"8000/tcp": [
{
"HostIp": "",
"HostPort": "8000"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"ConsoleSize": [
30,
127
],
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": [],
"BlkioDeviceWriteBps": [],
"BlkioDeviceReadIOps": [],
"BlkioDeviceWriteIOps": [],
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/f9435277f214c0c362ae38f3bf36485748a74aee564cfcf25b2c39159bababee-init/diff:/var/lib/docker/overlay2/od5spz2oxxzqr621dwjt75qgj/diff:/var/lib/docker/overlay2/fsg7j1si5jh532f2xy4y81irg/diff:/var/lib/docker/overlay2/030f14e3bc025c13b4423ea4fc4b021d1ac13054f9b90fb2111083b9f6bbc5d7/diff:/var/lib/docker/overlay2/6f02789f0eddc31047eb98503021393ae23759dab82ff9792f63435dc36d5804/diff",
"MergedDir": "/var/lib/docker/overlay2/f9435277f214c0c362ae38f3bf36485748a74aee564cfcf25b2c39159bababee/merged",
"UpperDir": "/var/lib/docker/overlay2/f9435277f214c0c362ae38f3bf36485748a74aee564cfcf25b2c39159bababee/diff",
"WorkDir": "/var/lib/docker/overlay2/f9435277f214c0c362ae38f3bf36485748a74aee564cfcf25b2c39159bababee/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "7af1f689e956",
"Domainname": "",
"User": "",
"AttachStdin": true,
"AttachStdout": true,
"AttachStderr": true,
"ExposedPorts": {
"8000/tcp": {}
},
"Tty": true,
"OpenStdin": true,
"StdinOnce": true,
"Env": [
"DISPLAY=host.docker.internal:0.0",
"PATH=/opt/conda/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"LANG=C.UTF-8",
"LC_ALL=C.UTF-8",
"XDG_RUNTIME_DIR=/tmp/runtime-root"
],
"Cmd": [
"/bin/bash"
],
"Image": "anaconda-gui-mount-image:latest",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"com.docker.compose.project": "07_ana-gui-docker-foldermount",
"com.docker.compose.service": "anaconda",
"com.docker.compose.version": "2.20.2",
"maintainer": "ys.yoshisuke@gmail.com",
"org.opencontainers.image.created": "2023-07-18T15:06:19.609Z",
"org.opencontainers.image.description": "Repository of Docker images created by Anaconda",
"org.opencontainers.image.licenses": "",
"org.opencontainers.image.revision": "912aa2402e807e2faeaf1e778c6be7cd73e70e1f",
"org.opencontainers.image.source": "https://github.com/ContinuumIO/docker-images",
"org.opencontainers.image.title": "docker-images",
"org.opencontainers.image.url": "https://github.com/ContinuumIO/docker-images",
"org.opencontainers.image.version": "2023.07-1",
"version": "1.0"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "573b95738f0ff0a175eda3f335eb3d0301fcb7b64715bdb1330fb670b1b780ef",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"8000/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "8000"
}
]
},
"SandboxKey": "/var/run/docker/netns/573b95738f0f",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "c532c917c07c2f8c83bd51619bb3f8fdba93a236cc509bc309c0fe67500605f8",
"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": "98569aa4661476bee122836019996153ae9f3051b635cd315eb54b11a473c0c8",
"EndpointID": "c532c917c07c2f8c83bd51619bb3f8fdba93a236cc509bc309c0fe67500605f8",
"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
}
}
}
}
]
（２）対象コンテナのネットワーク情報のみを表示
上記（１）のコマンドの出力はかなり長いですが、JSONの "Networks" セクションを探すことで、コンテナが接続しているネットワークに関する情報がわかります。
もしこの情報をより読みやすい形で得たい場合は、jqツールを使うと便利です。
・docker inspect | jq ‘.[0].NetworkSettings.Networks’
jqツールは、JSONデータをフィルタリングや変換するためのコマンドラインユーティリティです。このコマンドは、コンテナのネットワーク設定のみを抽出して表示します。
なお、jqは事前にインストールしておく必要があります。LinuxやmacOSの場合は、パッケージマネージャを通してインストールできます。Windowsの場合は、jqの公式サイトからバイナリをダウンロードして使えます。
実例：
docker inspect anaconda-dockerfile-gui-container | jq ‘.[0].NetworkSettings.Networks’
もしくは
docker inspect 7af1f689e956 | jq ‘.[0].NetworkSettings.Networks’
