Centos移动/home目录空间到/根目录下

来源：https://blog.csdn.net/qq_35771266/article/details/115239147

首先查看硬盘情况

df -h

文件系统                 容量  已用  可用 已用% 挂载点
devtmpfs                  63G     0   63G    0% /dev
tmpfs                     63G     0   63G    0% /dev/shm
tmpfs                     63G   11M   63G    1% /run
tmpfs                     63G     0   63G    0% /sys/fs/cgroup
/dev/mapper/centos-root   50G  8.6G   42G   18% /
/dev/md126p2            1014M  144M  871M   15% /boot
/dev/md126p1             200M   12M  189M    6% /boot/efi
/dev/mapper/centos-home  3.5T   33M  3.5T    1% /home
tmpfs                     13G     0   13G    0% /run/user/0

硬盘只有50G空间，在安装系统时划分得不够恰当，/根目录与/home目录基本上应该各占一半空间

备注：如果home目录下有数据一定要先备份，等挂载号以后再还原。因为我是新安装服务器没有数据所以直接跳过了。

卸载 /home 目录

umount /home/

移除/home卷。释放空间

lvremove /dev/mapper/centos-home

Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed

将空闲的空间移动50%到根目录下面

lvextend -l +50%FREE /dev/centos/root

Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 1.75 TiB (458816 extents).
  Logical volume centos/root successfully resized.

扩充到空间

xfs_growfs /dev/mapper/centos-root

meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 469827584

可以看到已经分配了1.75TB到根目录下面

重新创建home目录

lvcreate -l +100%FREE -n home centos

 Logical volume "home" created.

mkfs.xfs  /dev/mapper/centos-home

meta-data=/dev/mapper/centos-home isize=512    agcount=4, agsize=114179840 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=456719360, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=223007, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

mount  /dev/mapper/centos-home  /home

到这里就完成了，如果之前有备份数据，在这里就可以恢复了。

再次查看一下磁盘

df -h

文件系统                 容量  已用  可用 已用% 挂载点
devtmpfs                  63G     0   63G    0% /dev
tmpfs                     63G     0   63G    0% /dev/shm
tmpfs                     63G   11M   63G    1% /run
tmpfs                     63G     0   63G    0% /sys/fs/cgroup
/dev/mapper/centos-root  1.8T  8.6G  1.8T    1% /
/dev/md126p2            1014M  144M  871M   15% /boot
/dev/md126p1             200M   12M  189M    6% /boot/efi
tmpfs                     13G     0   13G    0% /run/user/0
/dev/mapper/centos-home  1.8T   33M  1.8T    1% /home

可以看到 根目录和 home 都是1.8T左右