centos7 home目录空间释放添加到指定分区

2021-10-07

cd /home 
tar czvf /home.tgz /home

这样，会在/下生成名叫home.tgz的压缩包，您可以在扩大/home目录后将这个包解回到新的/home目录中

cd / 
tar zxvf /home.tgz -C /

如果/home中确实没有什么有用的数据，这一步也可以省略。

在配置中删除home

vim /etc/fstab

#
# /etc/fstab
# Created by anaconda on Mon Sep 14 10:59:58 2020
#
# 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_llilei-root /                       xfs     defaults        0 0
UUID=f9d37ca9-9024-40e5-9587-b0262b887d2f /boot                   xfs     defaults        0 0
UUID=C9FE-4CEC          /boot/efi               vfat    umask=0077,shortname=winnt 0 0
/dev/mapper/centos_llilei-data /data                   xfs     defaults        0 0
/dev/mapper/centos_llilei-swap swap                    swap    defaults        0 0
~                                                                                                                                                          
~                                                                                                                                                          
~

删除需要删除的分区后保存

卸载home分区

umount /home

合并分区

卸载分区后空间还没有合并过来

[/]# df -h
文件系统                        容量  已用  可用 已用% 挂载点
devtmpfs                        7.7G     0  7.7G    0% /dev
tmpfs                           7.8G  4.0K  7.8G    1% /dev/shm
tmpfs                           7.8G   34M  7.7G    1% /run
tmpfs                           7.8G     0  7.8G    0% /sys/fs/cgroup
/dev/mapper/centos_llilei-root   50G   23G   28G   45% /
/dev/sda2                      1014M  308M  707M   31% /boot
/dev/sda1                       200M   12M  189M    6% /boot/efi
/dev/mapper/centos_llilei-data  800G  561G  240G   71% /data
tmpfs                           1.6G     0  1.6G    0% /run/user/0
tmpfs                           1.6G     0  1.6G    0% /run/user/997

我们使用 lvscan 命令查看lv的逻辑分区

[/]# lvscan 
  ACTIVE            '/dev/centos_llilei/root' [50.00 GiB] inherit
  ACTIVE            '/dev/centos_llilei/swap' [3.75 GiB] inherit
  ACTIVE            '/dev/centos_llilei/data' [800.00 GiB] inherit
  ACTIVE            '/dev/centos_llilei/home' [<76.56 GiB] inherit

可以看到最后一行就是我们需要删除的分区

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

使用lvremove 删除后再次查看

[/]# lvscan
  ACTIVE            '/dev/centos_llilei/root' [50.00 GiB] inherit
  ACTIVE            '/dev/centos_llilei/swap' [3.75 GiB] inherit
  ACTIVE            '/dev/centos_llilei/data' [800.00 GiB] inherit

之后合并分区

[/]# vgdisplay 
  --- Volume group ---
  VG Name               centos_llilei
  System ID         
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               930.31 GiB
  PE Size               4.00 MiB
  Total PE              238160
  Alloc PE / Size       218560 / 853.75 GiB
  Free  PE / Size       19600 / 76.56 GiB
  VG UUID               kDKNjq-224i-XkRp-e22W-kXWJ-fs1K-vqPve7

可以看到空闲空间有76G

将空闲分区加到data分区上

[/]# lvextend -l +100%free /dev/mapper/centos_llilei-data 
  Size of logical volume centos_llilei/data changed from 800.00 GiB (204800 extents) to 876.56 GiB (224400 extents).
  Logical volume centos_llilei/data successfully resized.

再次查看

[/]# vgdisplay 
  --- Volume group ---
  VG Name               centos_llilei
  System ID         
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               930.31 GiB
  PE Size               4.00 MiB
  Total PE              238160
  Alloc PE / Size       238160 / 930.31 GiB
  Free  PE / Size       0 / 0   
  VG UUID               kDKNjq-224i-XkRp-e22W-kXWJ-fs1K-vqPve7

现在使用 df -h查看空间还是没有的，需要使用xfs_growfs命令刷新一下

[/]# xfs_growfs /dev/mapper/centos_llilei-data 
meta-data=/dev/mapper/centos_llilei-data isize=512    agcount=4, agsize=52428800 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=209715200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=102400, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 209715200 to 229785600

home文件夹数据恢复

解压刚才备份的文件

[/]#  tar zxvf /home.tgz -C /
home/
home/black/
home/www/
home/www/.bash_logout
home/www/.bash_profile
home/www/.bashrc
home/super/
home/super/.bash_logout
home/super/.bash_profile
home/super/.bashrc

最后数据无价还是提醒下朋友做好备份

标题：centos7 home目录空间释放添加到指定分区
作者：llilei
地址：http://solo.llilei.work/articles/2021/10/07/1633587139875.html

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