容器元数据 就是指创建容器时，容器自带的信息
元数据
元数据(meta data)——”data about data” 描述数据的数据，一般是结构化数据 ( 如存储在数据库里的数据，规定了字段的长度、类型等 )
元数据是指从信息资源中抽取出来的用于说明其特征、内容的结构化的数据(如题名,版本、出版数据、相关说明,包括检索点等)，用于组织、描述、检索、保存、管理信息和知识资源
docker inspect
Docker 中可以使用 docker inspect 命令来查看容器的元数据, 它会返回一个 JSON 文件记录着容器的配置和状态信息
docker inspect <container_id>
我们先使用 docker ps -a 命令看一下有哪些容器
[root@ddkk.com ~]# docker ps -a
CONTAINER ID ...
cf38bec0c26f ...
e66458d65564 ...
4558b3b54da0 ...
e08201b591cd ...
我们随便挑一个容器 id，比如 e08201b591cd 然后使用 docker inspect 命令看一下它的元数据
[root@ddkk.com ~]# docker inspect e08201b591cd
[
{
"Id": "e08201b591cdccd198fa32c4eedbda4a9ca6c81ce2c066e885c592aede52a8a6",
"Created": "2018-05-30T23:37:48.6125189Z",
"Path": "/bin/bash",
"Args": [],
"State": {
"Status": "exited",
"Running": false,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 0,
"ExitCode": 0,
"Error": "",
"StartedAt": "2018-05-30T23:37:49.3270577Z",
"FinishedAt": "2018-05-30T23:37:51.1694816Z"
},
"Image": "sha256:e4422b8da209755dd5a8aa201ba79cef0c465003f46f6313f318a0e306e4fe05",
"ResolvConfPath": "/var/lib/docker/containers/e08201b591cdccd198fa32c4eedbda4a9ca6c81ce2c066e885c592aede52a8a6/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/e08201b591cdccd198fa32c4eedbda4a9ca6c81ce2c066e885c592aede52a8a6/hostname",
"HostsPath": "/var/lib/docker/containers/e08201b591cdccd198fa32c4eedbda4a9ca6c81ce2c066e885c592aede52a8a6/hosts",
"LogPath": "/var/lib/docker/containers/e08201b591cdccd198fa32c4eedbda4a9ca6c81ce2c066e885c592aede52a8a6/e08201b591cdccd198fa32c4eedbda4a9ca6c81ce2c066e885c592aede52a8a6-json.log",
"Name": "/hopeful_wing",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "shareable",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"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,
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/55a3fbb9340df768968751d5d7ce8079259f10b0d58366fab4cd3479ce2b3dbf-init/diff:/var/lib/docker/overlay2/6c44d4437a85ab8164585a836a9d2f374633d8456ba2817966d934be1d330175/diff:/var/lib/docker/overlay2/87315a6d9aa0ed5a2a7bbe021c2390c0a0de8b929a76790c9082982b374384ef/diff:/var/lib/docker/overlay2/9414cbf7af7e6db83f2c26a1c80dc3f1b1c2dffab7a8d7b47ff5c712cfff90c1/diff:/var/lib/docker/overlay2/4a54ef73e0fccd3c653bb00b6b4a57256c0043ab4c7c0e457cddbd9e3f7cb510/diff:/var/lib/docker/overlay2/a29ae73d46b6b549db1112c0f8fded4d3f70942ea5e8a2aa8afdaaf49fd54c4c/diff",
"MergedDir": "/var/lib/docker/overlay2/55a3fbb9340df768968751d5d7ce8079259f10b0d58366fab4cd3479ce2b3dbf/merged",
"UpperDir": "/var/lib/docker/overlay2/55a3fbb9340df768968751d5d7ce8079259f10b0d58366fab4cd3479ce2b3dbf/diff",
"WorkDir": "/var/lib/docker/overlay2/55a3fbb9340df768968751d5d7ce8079259f10b0d58366fab4cd3479ce2b3dbf/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "e08201b591cd",
"Domainname": "",
"User": "",
"AttachStdin": true,
"AttachStdout": true,
"AttachStderr": true,
"Tty": true,
"OpenStdin": true,
"StdinOnce": true,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/bash"
],
"Image": "ubuntu:17.10",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "affe418192894e1f2fe0a063cbbb33983b8d874436994629ce7244b54aafd57c",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/affe41819289",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "d63a40b5f304c0db53f0956641b592dd19bf4486ce9ef17e0d7464ca930b4dfa",
"EndpointID": "",
"Gateway": "",
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "",
"DriverOpts": null
}
}
}
}
]
数据很长，如果不做统计用途，也没啥大作用，我们这里就不一一解释了
更多docker inspect 命令使用方法，可以访问 docker inspect 命令