1、查看磁盘使用情况docker system df
[root@iZuf6ijiwyd0gil5jyti17Z ~]# docker system dfTYPETOTALACTIVE SIZERECLAIMABLEImages 5 4 978.6 MB 546.1 MB (55%)Containers4 3 892.8 MB 0 B (0%)Local Volumes 1 1 92 B0 B (0%)
2、清理磁盘docker system prune
[root@iZuf6ijiwyd0gil5jyti17Z ~]# docker system pruneWARNING! This will remove:- all stopped containers- all volumes not used by at least one container- all networks not used by at least one container- all dangling imagesAre you sure you want to continue? [y/N] yDeleted Containers:0ace31348ef73714f579037703076c0ecbafbbe6267066706d597e13a6f5987fTotal reclaimed space: 620.6 MB
说明：可以用于清理磁盘，删除关闭的容器、无用的数据卷和网络，以及dangling镜像(即无tag的镜像)
3、清理磁盘docker system prune -a
[root@iZuf6ijiwyd0gil5jyti17Z ~]# docker system prune -aWARNING! This will remove:- all stopped containers- all volumes not used by at least one container- all networks not used by at least one container- all images without at least one container associated to themAre you sure you want to continue? [y/N] yDeleted Images:untagged: docker.io/redis:latestuntagged: docker.io/redis@sha256:08e282682a708eb7f51b473516be222fff0251cdee5ef8f99f4441a795c335b6deleted: sha256:de974760ddb2f32dbddb74b7bb8cff4c1eee06d43d36d11bbca1dc815173916edeleted: sha256:6b55c9d53e82aae844119f70be80e7212c57eb7a1efd13f11934eb53fc8ab2e8deleted: sha256:1a1fe5dd46b6f7387e0185626d8c22ec69f511bfb361beb6a07d1647b5044956deleted: sha256:ef615ba85683864f78d22bf8bb98a1d54a90701da7a066562ef511bc5cc292c6deleted: sha256:f448a5cc1367794bb2f15d887438c8b43f2324ee3523f5d95c15997685cc816ddeleted: sha256:e481db33c0c73ee7de5ecda57c21fcfb7eeeff7d22fcc4ad0166b0bf64a63a32untagged: docker.io/ubuntu:latestuntagged: docker.io/ubuntu@sha256:3c9c713e0979e9bd6061ed52ac1e9e1f246c9495aa063619d9d695fb8039aa1fdeleted: sha256:26b77e58432b01665d7e876248c9056fa58bf4a7ab82576a024f5cf3dac146d6deleted: sha256:9de65d1e8b2782409b2420bf9347003a43e91bb65c1e4c8fbd7d098d6234f359deleted: sha256:e0f8e3acb2bf7fe9384463ae7009179d299b211e7cf17c2bf9d8e5e248cfe5b0deleted: sha256:0e64bafdc7ee828d0f3995bebfa388ced52a625ad2969eeb569f4a83db56d505untagged: docker.io/mysql:latestuntagged: docker.io/mysql@sha256:6e0014cdd88092545557dee5e9eb7e1a3c84c9a14ad2418d5f2231e930967a38deleted: sha256:cbe8815cbea8fb86ce7d3169a82d05301e7dfe1a8d4228941f23f4f115a887f2deleted: sha256:c74b92ab7fde96874c2f7afa77e338ebe739b829f5cb28a9975c9b0dcb47feb9deleted: sha256:fded7187915726c2d2d18c8178cd70ab9aceab27f49a68ead928a662664b9402deleted: sha256:217ef0e6aab8111068df664529c4bdcfc2b58701913028fd0d61b00265ad5a9bdeleted: sha256:1ab4dbca7ef7a8eb6f7ea8ddd780b5d55aac2a0098f2c217c68e31216a2de140deleted: sha256:1fbdda78e87b76772be16bd4a745db7f95d9af70d5a3728260548380121ae711deleted: sha256:cd35e2328f0670969657f1abae8beffbc1eb1fddbaf667e1e6e6286598500a35deleted: sha256:068b92efc0504adcd3c23f16fde80775a2f4dfe485e242206f638eae72c4fa1bdeleted: sha256:7c8818a166d9666c68fcdbe421c30568d60d51a505e540f42901664113047a75deleted: sha256:5aa8f65565168fd7db2aa6b9f8fb1db746aa598fa3854dcbdbb49d5a29f6d8a5deleted: sha256:cca9d1bafa1ee67bb4d7178732c0955a40a5dea6e5b989f61248984f26f7306bdeleted: sha256:34ca91e79c4027120ca740231d415c739cccad57d1ee68d6a6e67ca60bbaf3a4deleted: sha256:7e718b9c0c8c2e6420fe9c4d1d551088e314fe923dce4b2caf75891d82fb227dTotal reclaimed space: 655.1 MB
说明：清理得更加彻底，可以将没有容器使用Docker镜像都删掉。注意，这两个命令会把你暂时关闭的容器，以及暂时没有用到的Docker镜像都删掉了！（慎用）
4、迁移数据目录
4.1停止docker服务
systemctl stop docker
4.2创建docker新目录
mkdir -p /home/dockerData
4.3迁移/var/lib/docker目录下面的文件到/home/dockerData
rsync -avzP /var/lib/docker /home/dockerData/
4.4查看配置
systemctl status docker
4.5修改配置
vim /usr/lib/systemd/system/docker.serviceExecStart后添加--graph=/home/dockerData/docker#原来的ExecStart=/usr/bin/dockerd-current \#修改之后的ExecStart=/usr/bin/dockerd-current --graph=/home/dockerData/docker \
4.6重启docker
systemctl daemon-reloadsystemctl start docker
5、查看数据目录
docker info... ...Security Options:seccompWARNING: You're not using the default seccomp profileProfile: /etc/docker/seccomp.jsonKernel Version: 3.10.0-1062.18.1.el7.x86_64Operating System: CentOS Linux 7 (Core)OSType: linuxArchitecture: x86_64Number of Docker Hooks: 3CPUs: 1Total Memory: 991 MiBName: iZuf6ijiwyd0gil5jyti17ZID: CJZS:AJZL:B3CP:VD3Q:LIXV:CGLI:DHU3:OZIO:GIW2:FKXJ:VAUB:4GY4Docker Root Dir: /home/dockerData/dockerDebug Mode (client): falseDebug Mode (server): falseRegistry: https://index.docker.io/v1/... ...
此时，可以查看镜像都存在，重新启动容器即可，完美解决！
