[lxl@node1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 49G 34G 15G 70% / devtmpfs 7.8G 0 7.8G 0% /dev tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs 7.8G 8.4M 7.8G 1% /run tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup /dev/mapper/centos-home 24G 44M 24G 1% /home
查看/home有24G。 备份/home目录， umount掉/dev/mapper/centos-home
umount /dev/mapper/centos-home
假设要mount到/var/lib/docker目录， 备份/var/lib/docker
mount /dev/mapper/centos-home /var/lib/docker
df -h可以看到/dev/mapper/centos-home挂载到了/var/lib/docker下
[lxl@node1 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 49G 34G 15G 70% / devtmpfs 7.8G 0 7.8G 0% /dev tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs 7.8G 8.5M 7.8G 1% /run tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup /dev/mapper/centos-home 24G 44M 24G 1% /var/lib/docker
原文：http://www.cnblogs.com/lixiaolun/p/6483604.html