Docker磁盘空间使用分析与清理的方法
本文介绍了Docker磁盘空间使用分析与清理的方法，分享给大家，具体如下：
用了一段时间Docker后，会发现它占用了不少硬盘空间。还好Docker1.13引入了解决方法，它提供了简单的命令System来查看/清理Docker使用的磁盘空间。
前情提要
#MyVersion [root@dockercon~]#dockerversion Client: Version:17.12.0-ce APIversion:1.35 Goversion:go1.9.2 Gitcommit:c97c6d6 Built:WedDec2720:10:142017 OS/Arch:linux/amd64 Server: Engine: Version:17.12.0-ce APIversion:1.35(minimumversion1.12) Goversion:go1.9.2 Gitcommit:c97c6d6 Built:WedDec2720:12:462017 OS/Arch:linux/amd64 Experimental:false
Docker的内置CLI指令dockersystemdf，可用于查询镜像（Images）、容器（Containers）和本地卷（LocalVolumes）等空间使用大户的空间占用情况。
[root@dockercon~]#dockerimages REPOSITORYTAGIMAGEIDCREATEDSIZE kalilinux/kali-linux-dockerlatestc927a54ec8a48daysago1.88GB nginxlatest3f8a4339aadd9daysago108MB busyboxlatest6ad733544a632monthsago1.13MB [root@dockercon~]#dockersystemdf TYPETOTALACTIVESIZERECLAIMABLE Images301.994GB1.994GB(100%) Containers000B0B LocalVolumes000B0B BuildCache0B0B
可以进一步通过-v参数查看空间占用细节
[root@dockercon~]#dockersystemdf-v #镜像空间使用情况 Imagesspaceusage: REPOSITORYTAGIMAGEIDCREATEDagoSIZESHAREDSIZEUNIQUESiZECONTAINERS kalilinux/kali-linux-dockerlatestc927a54ec8a48daysagoago1.884GB0B1.884GB0 nginxlatest3f8a4339aadd9daysagoago108.5MB0B108.5MB0 busyboxlatest6ad733544a632monthsagoago1.129MB0B1.129MB0 #容器空间使用情况 Containersspaceusage: CONTAINERIDIMAGECOMMANDLOCALVOLUMESSIZECREATEDagoSTATUSNAMES #本地卷使用情况 LocalVolumesspaceusage: VOLUMENAMELINKSSIZE Buildcacheusage:0B
空间清理
不同状态
已使用镜像（usedimage）
未引用镜像（unreferencedimage）
悬空镜像（danglingimage）
镜像含义
指所有已被容器（包括已停止的）关联的镜像。
没有被分配或使用在容器中的镜像
未配置任何Tag（也就无法被引用）的镜像
Docker内置自动清理：
通过Docker内置的CLI指令dockersystemprune来进行自动空间清理。
[root@dockercon~]#dockersystemprune--help Usage:dockersystemprune[OPTIONS] Removeunuseddata Options: -a,--allRemoveallunusedimagesnotjustdanglingones --filterfilterProvidefiltervalues(e.g.'label== ') -f,--forceDonotpromptforconfirmation --volumesPrunevolumes
dockersystemprune自动清理说明：
该指令默认会清除所有如下资源：
- 已停止的容器（container）
- 未被任何容器所使用的卷（volume）
- 未被任何容器所关联的网络（network）
- 所有悬空镜像（image）。
该指令默认只会清除悬空镜像，未被使用的镜像不会被删除。添加-a或--all参数后，可以一并清除所有未使用的镜像和悬空镜像。
可以添加-f或--force参数用以忽略相关告警确认信息。
[root@dockercon~]#dockersystemprune--help Usage:dockersystemprune[OPTIONS] Removeunuseddata Options: -a,--allRemoveallunusedimagesnotjustdanglingones --filterfilterProvidefiltervalues(e.g.'label== ') -f,--forceDonotpromptforconfirmation --volumesPrunevolumes [root@dockercon~]#dockersystemprune--all WARNING!Thiswillremove: -allstoppedcontainers -allnetworksnotusedbyatleastonecontainer -allimageswithoutatleastonecontainerassociatedtothem -allbuildcache Areyousureyouwanttocontinue?[y/N]y DeletedContainers: f095899e7343e160d5b32d0688a6561a1a7f6af91c42ffe966649240b58ca23f DeletedImages: untagged:busybox:latest untagged:busybox@sha256:e3789c406237e25d6139035a17981be5f1ccdae9c392d1623a02d31621a12bcc deleted:sha256:6ad733544a6317992a6fac4eb19fe1df577d4dec7529efec28a5bd0edad0fd30 deleted:sha256:0271b8eebde3fa9a6126b1f2335e170f902731ab4942f9f1914e77016540c7bb untagged:kalilinux/kali-linux-docker:latest untagged:kalilinux/kali-linux-docker@sha256:28ff9e4bf40f7399e0570394a2d3d388a7b60c748be1b0a180c14c87afad1968 deleted:sha256:c927a54ec8a46164d7046b2a6dc09b2fce52b3066317d50cf73d14fa9778ca48 deleted:sha256:244c1920ef0442167cdbd095e5d29813cb5be0b70cc116faf8d7e50074f6c446 deleted:sha256:7748477cf079d6b0c13925ca90a5a1c7e93b8b508853f0cdff506c18caee14bd deleted:sha256:dd9acc2ebbb7901b407d4270d4fd065d9bee10d11f2df13a256d892cc6e892f9 deleted:sha256:46c7843e50429fcafe2d3b6c676ac1a25e00851420ba2b1d52c69307f68ab3e5 deleted:sha256:f0944ddbb9bb11fb68f7edbde8e849233f7562d8087248c944e8c2fc7fe9fc0b deleted:sha256:146e723c1713625c00cc736d74c9f6a16bd24464c42b33a8a234ec6e4c8b61ef deleted:sha256:bca8a24862472a44c7ab1e3bdf2d5e4008e35d6c50b94f2547d3d595d86abef1 deleted:sha256:749be9d8a5ebb09cbc58d50c4b7244a10accdedc2a01c1d65d07d25322caacad deleted:sha256:2d9e7ebb987a4cfb3142ce1612640248085d05b264012cb0885b3062105dfcb4 deleted:sha256:0655dca90e7c9c62d48128343ce89e016ae9f9df75c9dd6ad66c281e04e2b431 deleted:sha256:e78aa5d90040550584961eaccec1d047b755e97148fe753186e221c5ac40e330 deleted:sha256:598719dc4ba2de8d1be6564ca1f43846497608188cd20476712f7449755fea21 deleted:sha256:b084b4800972b561c21d804fab08c1fff0b9a9bcbf95a5394c0d4292c145c6d0 deleted:sha256:2e1b87f8f95e635c8ff4cbde28be38df39e8f3614576e09d7fb69c20421d1727 deleted:sha256:4a4a13e39112faa3b7ef0cb307bbf926fd1e46f3fbb9bc803cb9f4ab2f7694b0 untagged:alpine:latest untagged:alpine@sha256:ccba511b1d6b5f1d83825a94f9d5b05528db456d9cf14a1ea1db892c939cda64 untagged:alpine-io:latest deleted:sha256:3a043b0342a4907a1dfc95e2ea5e4df6a8e92d29dfe5d5910282bdfff27045d4 deleted:sha256:ddfb1d0e7629fd459b04f6efa89109ea0f7458aec76760e31888464d3074ae56 deleted:sha256:b6a7ea2197b744efab03320eda59d036ac3458ab7a0c5ada355faff0dd936af0 deleted:sha256:c96ab19b9ede349cb84e510a76a93d2b155aad54416f1591d7128cdeef228efc deleted:sha256:43e7d32baaf31ab6bd4210ff3df54d1dec57cc761eab88c5eaef2973d6bed770 deleted:sha256:11a9226e2c0aeaa12408501b274575c8ee471a785b332af3c776e23dfd2eb629 deleted:sha256:bd9f490e64a2ceccdeb936f43047c0757635b4bc88159ba5b191285ef41f535c deleted:sha256:e21c333399e0aeedfd70e8827c9fba3f8e9b170ef8a48a29945eb7702bf6aa5f deleted:sha256:04a094fe844e055828cb2d64ead6bd3eb4257e7c7b5d1e2af0da89fa20472cf4 untagged:nginx:latest untagged:nginx@sha256:cf8d5726fc897486a4f628d3b93483e3f391a76ea4897de0500ef1f9abcd69a1 deleted:sha256:3f8a4339aadda5897b744682f5f774dc69991a81af8d715d37a616bb4c99edf5 deleted:sha256:bb528503f6f01b70cd8de94372e1e3196fad3b28da2f69b105e95934263b0487 deleted:sha256:410204d28a96d436e31842a740ad0c827f845d22e06f3b1ff19c3b22706c3ed4 deleted:sha256:2ec5c0a4cb57c0af7c16ceda0b0a87a54f01f027ed33836a5669ca266cafe97a Totalreclaimedspace:5.219GB
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