卷是目錄或檔案，存在于一個或多個容器中，由docker挂載到容器，但不屬于聯合檔案系統，是以能夠繞過聯合檔案系統提供一些用于持續存儲或共享資料的特性：
卷的目的就是資料持久化，完全獨立于容器的生命周期，是以Docker不會在容器删除時候删除其挂載的資料卷。
特點：
1.資料卷可在容器之間共享或重用資料
2.卷中更改可以直接生效
3.資料卷中的更改不會包含在鏡像的更新中
4.資料卷的生命周期一直持續到沒有容器使用它為止
容器内添加資料卷有兩種方式：
1.直接指令添加
2.DockFile添加
docker run -it /主控端絕對路徑目錄:/容器内目錄 鏡像名
docker run -it -v /myDataVolume:/dataVolumerContainer centos
啟動容器：
主控端中檢視：
主控端中執行
[
{
"Id": "c7176f1ca5ccd412138c6aefc0ae6456a118d7df2fa30efa2010931b051b2b13",
"Created": "2021-07-31T13:18:15.879445403Z",
"Path": "/bin/bash",
"Args": [],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 5383,
"ExitCode": 0,
"Error": "",
"StartedAt": "2021-07-31T13:18:17.602809512Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:300e315adb2f96afe5f0b2780b87f28ae95231fe3bdd1e16b9ba606307728f55",
"ResolvConfPath": "/var/lib/docker/containers/c7176f1ca5ccd412138c6aefc0ae6456a118d7df2fa30efa2010931b051b2b13/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/c7176f1ca5ccd412138c6aefc0ae6456a118d7df2fa30efa2010931b051b2b13/hostname",
"HostsPath": "/var/lib/docker/containers/c7176f1ca5ccd412138c6aefc0ae6456a118d7df2fa30efa2010931b051b2b13/hosts",
"LogPath": "/var/lib/docker/containers/c7176f1ca5ccd412138c6aefc0ae6456a118d7df2fa30efa2010931b051b2b13/c7176f1ca5ccd412138c6aefc0ae6456a118d7df2fa30efa2010931b051b2b13-json.log",
"Name": "/flamboyant_euler",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "docker-default",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/myDataVolume:/dataVolumerContainer"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"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",
"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,
"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": "/var/lib/docker/overlay2/29112dcdd9f0b15b16a2a17e88a7f0953df0d4699dad280745df0fe27a9ba34d-init/diff:/var/lib/docker/overlay2/3f7ee985dd7d958a3dcc02a25152a8037dd8f5cf51ff69d49929459fcd0ceff4/diff",
"MergedDir": "/var/lib/docker/overlay2/29112dcdd9f0b15b16a2a17e88a7f0953df0d4699dad280745df0fe27a9ba34d/merged",
"UpperDir": "/var/lib/docker/overlay2/29112dcdd9f0b15b16a2a17e88a7f0953df0d4699dad280745df0fe27a9ba34d/diff",
"WorkDir": "/var/lib/docker/overlay2/29112dcdd9f0b15b16a2a17e88a7f0953df0d4699dad280745df0fe27a9ba34d/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "bind",
"Source": "/myDataVolume",
"Destination": "/dataVolumerContainer",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
"Config": {
"Hostname": "c7176f1ca5cc",
"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": "centos",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "20201204",
"org.label-schema.license": "GPLv2",
"org.label-schema.name": "CentOS Base Image",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "CentOS"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "540fb4961552173dcf8fbcef224b68ad979e0d69d4c446b0b0b30971f4205c47",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/540fb4961552",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "0acfad2c74e67b334e19a0e80c8fb29e7a04fed1a4bb5595ee49e47fc361c1f6",
"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": "76c08e7b852eed7c164b40f637886bae674b2ccfc13f1248a6a5a2780426852b",
"EndpointID": "0acfad2c74e67b334e19a0e80c8fb29e7a04fed1a4bb5595ee49e47fc361c1f6",
"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
}
}
}
}
]
主控端
touch test.txt 容器中檢視：