centos7把/home空间合并到/(根目录)

post by rocdk890 / 2019-8-27 15:18 Tuesday linux技术

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大家在使用虚拟机创建centos系统的时候,会发现原本打算分配的空间,有一部分给/home分配走了,这样就造成我们的根目录空间不够,所以我们要把/home分配走的空间还给根目录.

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)

# /etc/fstab

# 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

or

lvextend -l +100%FREE /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

可以看到根目录空间已经增大.好了,大家可以自行试试.

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