动态扩容centos7根目录

• 背景

因为centos安装系统默认根分区只有50G,不是很够用,剩余的磁盘都在/home下面.

• 步骤

备份家目录 cp -r /home /srv/ 卸载/home umount /home 关闭/home下的进程

fuser -km /home

删除home所在的逻辑卷lv

lvremove /dev/mapper/centos-home

扩大根目录所在的卷，+1T

 lvextend -L +1T /dev/mapper/centos-root

xfs_growfs /dev/mapper/centos-root

恢复home逻辑卷

  lvcreate -L 0.2T -n/dev/mapper/centos-home
  lvcreate -L 0.2T -n/dev/mapper/centos-home
  mkfs.xfs  /dev/mapper/centos-home
 mount /dev/mapper/centos-home