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2020/6/13

Docker 檢視容器資訊 inspect container config info

Docker 查詢容器配置資訊的方法如下。

例如下面用docker ps檢視目前有一運行中的nginx容器如下,容器ID為2e33400c9c6c,名稱為webserver

$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
2e33400c9c6c        nginx               "nginx -g 'daemon of…"   6 weeks ago         Up 52 minutes       0.0.0.0:80->80/tcp   webserver

使用docker inspect <CONTAINER_NAME/CONTAINER_ID>指令可檢視容器的詳細資訊,內容以json格式顯示。<CONTAINER_ID>為容器ID;<CONTAINER_NAME>為容器名稱。

例如用docker inspect 2e33400c9c6c檢視運行中的nginx容器詳細資訊如下。

$ docker inspect 2e33400c9c6c
[
    {
        "Id": "2e33400c9c6c18a96242b2e6d36f8dc04fa12a4c70b1135a32e308583b1148c4",
        "Created": "2020-05-01T14:42:01.850230454Z",
        "Path": "nginx",
        "Args": [
            "-g",
            "daemon off;"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 8340,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2020-06-13T13:13:06.832167668Z",
            "FinishedAt": "2020-05-02T03:54:48.643961581Z"
        },
        "Image": "sha256:602e111c06b6934013578ad80554a074049c59441d9bcd963cb4a7feccede7a5",
        "ResolvConfPath": "/mnt/sda1/var/lib/docker/containers/2e33400c9c6c18a96242b2e6d36f8dc04fa12a4c70b1135a32e308583b1148c4/resolv.conf",
        "HostnamePath": "/mnt/sda1/var/lib/docker/containers/2e33400c9c6c18a96242b2e6d36f8dc04fa12a4c70b1135a32e308583b1148c4/hostname",
        "HostsPath": "/mnt/sda1/var/lib/docker/containers/2e33400c9c6c18a96242b2e6d36f8dc04fa12a4c70b1135a32e308583b1148c4/hosts",
        "LogPath": "/mnt/sda1/var/lib/docker/containers/2e33400c9c6c18a96242b2e6d36f8dc04fa12a4c70b1135a32e308583b1148c4/2e33400c9c6c18a96242b2e6d36f8dc04fa12a4c70b1135a32e308583b1148c4-json.log",
        "Name": "/webserver",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {
                "80/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "80"
                    }
                ]
            },
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "Capabilities": null,
            "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",
            "ConsoleSize": [
                31,
                80
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 0,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": [],
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DeviceRequests": null,
            "KernelMemory": 0,
            "KernelMemoryTCP": 0,
            "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": "/mnt/sda1/var/lib/docker/overlay2/512e19056bc7a80f60bd16d4a7166f15b248b6c3e9590bb6c40ecc3f7993e87f-init/diff:/mnt/sda1/var/lib/docker/overlay2/33d75eedda0fb55b2d12e1b285e65cfeb38d6131576a3c639e3c43a1d7a80717/diff:/mnt/sda1/var/lib/docker/overlay2/070b9d03ba84f3a122ce436cd8c2a48f39ccd3aaab950836cf0c3fe0610eccb5/diff:/mnt/sda1/var/lib/docker/overlay2/6860df7ad91c269b48309a72895ac390a8f7d3b5679aac5b909d3748170e547d/diff",
                "MergedDir": "/mnt/sda1/var/lib/docker/overlay2/512e19056bc7a80f60bd16d4a7166f15b248b6c3e9590bb6c40ecc3f7993e87f/merged",
                "UpperDir": "/mnt/sda1/var/lib/docker/overlay2/512e19056bc7a80f60bd16d4a7166f15b248b6c3e9590bb6c40ecc3f7993e87f/diff",
                "WorkDir": "/mnt/sda1/var/lib/docker/overlay2/512e19056bc7a80f60bd16d4a7166f15b248b6c3e9590bb6c40ecc3f7993e87f/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [],
        "Config": {
            "Hostname": "2e33400c9c6c",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "NGINX_VERSION=1.17.10",
                "NJS_VERSION=0.3.9",
                "PKG_RELEASE=1~buster"
            ],
            "Cmd": [
                "nginx",
                "-g",
                "daemon off;"
            ],
            "Image": "nginx",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
            },
            "StopSignal": "SIGTERM"
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "8a86bbf004aec994343f28fb21ea9058447aa54a8c194430f107bc510da2ff87",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
                "80/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "80"
                    }
                ]
            },
            "SandboxKey": "/var/run/docker/netns/8a86bbf004ae",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "5b9d62392965614b521f0d98add96df4101c0820ad79476932383155016cf034",
            "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": "802679f95dae3349138d4ece6194cd4db54da1c5efc1df4406b7619829a1e3ad",
                    "EndpointID": "5b9d62392965614b521f0d98add96df4101c0820ad79476932383155016cf034",
                    "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
                }
            }
        }
    }
]

若只要看某一子項目的資訊,使用
docker inspect --format='{{.ItemName}}' <CONTAINER_NAME/CONTAINER_ID>
ItemName為子屬性的名稱,可以後接多個,例如'{{.Config.Hostname}}'

例如用docker inspect --format='{{.Config.Hostname}}' webserver檢視nginx的hostname。

$ docker inspect --format='{{.Config.Hostname}}' webserver
2e33400c9c6c

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