将Centos7的HOME分区空间重新分配给/root分区

流程方法一：

查看分区

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[root@srvLessCodeTest ~]# df -h
文件系统                 容量  已用  可用 已用% 挂载点
devtmpfs                 3.9G     0  3.9G    0% /dev
tmpfs                    3.9G   16K  3.9G    1% /dev/shm
tmpfs                    3.9G  9.0M  3.9G    1% /run
tmpfs                    3.9G     0  3.9G    0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   19G   32G   37% /
/dev/sda1               1014M  196M  819M   20% /boot
/dev/mapper/centos-home  421G   33M  421G    1% /home
tmpfs                    783M     0  783M    0% /run/user/0

备份home目录

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[root@srvLessCodeTest ~]# mkdir /home-backup
[root@srvLessCodeTest ~]# mv /home/* /home-backup/

移除/home分区

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[root@srvLessCodeTest ~]# umount /home
[root@srvLessCodeTest ~]# 
[root@srvLessCodeTest ~]# lvremove /dev/centos/home 
Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed
[root@srvLessCodeTest ~]#

查看VG空间

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[root@srvLessCodeTest ~]# 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               <479.00 GiB
  PE Size               4.00 MiB
  Total PE              122623
  Alloc PE / Size       14816 / <57.88 GiB
  Free  PE / Size       107807 / 421.12 GiB
  VG UUID               dJSZJu-XpUR-0ThA-esuO-1Avs-3S4Q-Mb7zTp

重新创建home卷

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[root@srvLessCodeTest ~]# lvcreate -L 64G -n home centos
WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y
  Wiping xfs signature on /dev/centos/home.
  Logical volume "home" created.
[root@srvLessCodeTest ~]#

查看卷空间

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[root@srvLessCodeTest ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                SzSQ5r-NL2Q-OQHE-7fy7-TGUZ-u2Jf-dMIAtL
  LV Write Access        read/write
  LV Creation host, time srvlesscode.china.local, 2024-03-19 11:11:34 +0800
  LV Status              available
  # open                 2
  LV Size                <7.88 GiB
  Current LE             2016
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                wi7SQ8-qKfQ-tzth-vCzj-1FDJ-B7Yi-AFzVPn
  LV Write Access        read/write
  LV Creation host, time srvlesscode.china.local, 2024-03-19 11:11:36 +0800
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/centos/home
  LV Name                home
  VG Name                centos
  LV UUID                C6AzYU-1Tvp-cV9Z-8I9q-ntdf-nTHm-pcNADc
  LV Write Access        read/write
  LV Creation host, time srvLessCodeTest.china.local, 2024-05-22 12:08:26 +0800
  LV Status              available
  # open                 0
  LV Size                64.00 GiB
  Current LE             16384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2

格式化新home卷

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[root@srvLessCodeTest ~]# mkfs -t xfs /dev/centos/home 
Discarding blocks...Done.
meta-data=/dev/centos/home       isize=512    agcount=4, agsize=4194304 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=16777216, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=8192, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

挂载/home卷

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[root@srvLessCodeTest ~]# mount /dev/centos/home /home

恢复home分区文件

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[root@srvLessCodeTest ~]# mv /home-backup/* /home
[root@srvLessCodeTest ~]# rm -rf /home-backup

再次查看卷组剩余空间

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[root@srvLessCodeTest ~]# vgdisplay 
  --- Volume group ---
  VG Name               centos
  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               <479.00 GiB
  PE Size               4.00 MiB
  Total PE              122623
  Alloc PE / Size       31200 / <121.88 GiB
  Free  PE / Size       91423 / 357.12 GiB
  VG UUID               dJSZJu-XpUR-0ThA-esuO-1Avs-3S4Q-Mb7zTp

扩展/root分区

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[root@srvLessCodeTest ~]# lvextend -L +357.12G /dev/centos/root
  Rounding size to boundary between physical extents: 357.12 GiB.
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 407.12 GiB (104223 extents).
  Logical volume centos/root successfully resized.

使用xfs_growfs命令扩展/root分区的XFS文件系统【操作完成】

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[root@srvLessCodeTest ~]# xfs_growfs /dev/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 106724352

流程方法二：

查看磁盘使用情况

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df -h

备份分区文件

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tar cvf /data/home.tar /home

卸载删除/home分区

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umount /home
lvremove /dev/mapper/centos-home    【按Y】

扩展/root逻辑卷

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lvextend -L +315G /dev/mapper/centos-root

扩展文件系统

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xfs_growfs /dev/mapper/centos-root

重建/home逻辑卷

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lvcreate -L 64.18G /dev/mapper/centos-home

创建/home文件系统

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mkfs.xfs /dev/mapper/centos-home

重新挂载/home分区

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mount /dev/mapper/centos-home

恢复并删除备份

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tar xvf /data/home.tar -C /
rm -rf /data/home.tar

【完成扩展】可查看分区结果

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df -h
#Linux
将Centos7的HOME分区空间重新分配给/root分区
http://anximin.github.io/2024/05/22/Linux_LVMcentos7/
作者
Sylar
发布于
2024年5月22日
许可协议