The image of docker and some data are in the /var/lib/docker directory, which occupies the system partition of Linux, namely /dev/vda 1 below. When there are multiple images, the space of /dev/vda 1 may not be enough, so we can mount Docker's data on a data disk, such as /dev/vdb directory. [root @ 10- 10-63- 106 docker]# df-lhtfilesystemtypesizeusedavauiuse % mounted on/dev/vda 1 xfs 20g 3.8g 1 6G20%/devtmpsfsdevtmpfs916m0916m0%/devtmpfstmpfs921m0928 $ (date+%y-%m-%d) (2) Stop docker and use rsync to/var/lib/. If rsync is not installed, please install it using yum-yintallrsync and stop docker. Servicedockerstop, create the directory to be mounted to the data partition, mkdir/data/docker uses rsync tool to synchronize, rsync-axes /var/lib/docker/. /data/docker/, which may take a long time, depending on the size of /var/lib/docker. (3) Modify the fstab and add the following lines in the fstab of this file. Mount the new location in the file/var/lib/docker/data/docker/var/lib/dockernonebind00, as follows: [root @10-10-63-106 docker] # cat/etc/fstab. createdbyanacondaonthujul 3 107:50: 1320 14 # # Accessiblefilesystems，byreference， aremaintainedunder '/dev/disk ' # seemanpagessfstab(5)，findfs(8)， Mount(8) and/orblkid (8) for more info #/dev/vda1/xferrors = remount-ro01/ swapfilenoneswasdf-lhtfilesystemtypesizeusedavailse % mounted on/dev/vda 1x fs 20g 13g 6.9g 65%/devtmpfsdevtmpfs 9 16m 0%/ devtmpfstmpfs 92 1m 092 1m 0%/dev/shmtmpfstmpfs 92 1m 89m 832m 65438