centos7把home目录与跟目录合并

系统:centos7(64位)

1.先查看空间分配情况

df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   38G  978M   37G   3% /
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.8M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1               1014M  142M  873M  14% /boot
/dev/mapper/centos-home   19G   33M   19G   1% /home
tmpfs                    783M     0  783M   0% /run/user/0

可以看到整个硬盘是60G,根目录只用了38G,/home使用了19G.

2.卸载/home分区

如果你/home里有数据,记得保存,我这是空的,所以直接执行:

umount /home
vim /etc/fstab     ###(注释掉/home,避免开机自检)
Created by anaconda on Wed Jul  3 02:57:40 2019
Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=d7be0dd8-95ec-4495-a64c-459462ae7256 /boot                   xfs     defaults        0 0
#/dev/mapper/centos-home /home                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0

3.删除/home所在的lv

lvremove /dev/mapper/centos-home

接着会出现确认的内容，输入“y”，回车

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

Logical volume "home" successfully removed

4.查看物理卷情况

vgdisplay
--- Volume group ---
VG Name               centos
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  5
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               2
Max PV                0
Cur PV                1
Act PV                1
VG Size               <59.00 GiB
PE Size               4.00 MiB
Total PE              15103
Alloc PE / Size       10473 / 40.91 GiB
Free  PE / Size       4630 / <18.09 GiB
VG UUID               damgP3-SFOn-9IfM-k4bX-B2g1-D3HG-otTWEd

ps:

查看 Free  PE / Size这项,可以看到还有18.09G可以分配,但我们实际只能分配18G.

5.扩展/root所在的lv

lvextend -L +18G /dev/mapper/centos-root
Size of logical volume centos/root changed from <37.04 GiB (9481 extents) to <55.04 GiB (14089 extents).
Logical volume centos/root successfully resized.

6.扩展/root空间

xfs_growfs /dev/mapper/centos-root

meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=2427136 blks
=                       sectsz=512   attr=2, projid32bit=1
=                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=9708544, imaxpct=25
=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=4740, version=2
=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

7.检查是否成功

df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   56G  979M   55G   2% /
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.8M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1               1014M  142M  873M  14% /boot
tmpfs                    783M     0  783M   0% /run/user/0