Linux系统将home空间分配根目录

前言，在Linux中由于磁盘使用不恰当，导致空间使用分配合理，但不能随意修改已有资源，只能扩展磁盘

[root@localhost Cloudreve]# df -hl
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.9M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   46G  4.4G  92% /
/dev/sda2               1014M  194M  821M  20% /boot
/dev/mapper/centos-home  3.6T   53M  3.6T   1% /home
tmpfs                    783M     0  783M   0% /run/user/0

可以看出，根目录严重不够，home还有3.6T，此时需要home空间到根

先安装，否则使用不了fuser命令

yum install -y psmisc

查看home是否被使用

[root@localhost Cloudreve]# fuser -m /home
[root@localhost Cloudreve]#

备份home

[root@localhost Cloudreve]# tar -cvf home.tar home
tar: home: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# tar -cvf home.tar /home
tar: Removing leading `/' from member names
/home/
/home/shuchengyang/
/home/shuchengyang/.bash_logout
/home/shuchengyang/.bash_profile
/home/shuchengyang/.bashrc
/home/shuchengyang/cloudreve_3.5.3_linux_amd64.tar.gz
/home/shuchengyang/Cloudreve-3.5.3.tar.gz

卸载home

[root@localhost Cloudreve]# df -hl
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.9M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   46G  4.3G  92% /
/dev/sda2               1014M  194M  821M  20% /boot
tmpfs                    783M     0  783M   0% /run/user/0

移除逻辑盘

[root@localhost Cloudreve]# lvremove /dev/mapper/centos-home

给根路径分配空间

lvextend -L +450G /dev/mapper/centos-root

 lvextend -L +3072G /dev/mapper/centos-root

创建home

[root@localhost Cloudreve]# lvcreate -L 448G -n home centos

[root@localhost Cloudreve]# mkfs.xfs /dev/mapper/centos-home

[root@localhost Cloudreve]# mount /dev/mapper/centos-home /home

还原备份数据

[root@localhost Cloudreve]# tar -xvf home.tar
home/
home/shuchengyang/
home/shuchengyang/.bash_logout
home/shuchengyang/.bash_profile
home/shuchengyang/.bashrc
home/shuchengyang/cloudreve_3.5.3_linux_amd64.tar.gz
home/shuchengyang/Cloudreve-3.5.3.tar.gz

[root@localhost Cloudreve]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed
[root@localhost Cloudreve]# lvextend -L +450G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 500.00 GiB (128000 extents).
  Logical volume centos/root successfully resized.
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# lvextend -L +3072G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 500.00 GiB (128000 extents) to <3.49 TiB (914432 extents).
  Logical volume centos/root successfully resized.
[root@localhost Cloudreve]# 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 936378368
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# lvcreate -L 448G -n home centos
  Volume group "centos" has insufficient free space (32256 extents): 114688 required.
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# lvcreate -L 31G -n home centos
  Logical volume "home" created.
[root@localhost Cloudreve]# mkfs.xfs /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=512    agcount=4, agsize=2031616 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=8126464, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=3968, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# mount /dev/mapper/centos-home /home
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# df -hl
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.9M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root  3.5T   46G  3.5T   2% /
/dev/sda2               1014M  194M  821M  20% /boot
tmpfs                    783M     0  783M   0% /run/user/0
/dev/mapper/centos-home   31G   33M   31G   1% /home
[root@localhost Cloudreve]# tar -xvf home.tar
home/
home/shuchengyang/
home/shuchengyang/.bash_logout
home/shuchengyang/.bash_profile
home/shuchengyang/.bashrc
home/shuchengyang/cloudreve_3.5.3_linux_amd64.tar.gz
home/shuchengyang/Cloudreve-3.5.3.tar.gz
[root@localhost Cloudreve]#
[root@localhost Cloudreve]# [root@localhost Cloudreve]# df -hl
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  8.9M  3.9G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   46G  4.4G  92% /
/dev/sda2               1014M  194M  821M  20% /boot
/dev/mapper/centos-home  3.6T   53M  3.6T   1% /home
tmpfs                    783M     0  783M   0% /run/user/0