Centos 8系统xfs文件系统类型进行扩容缩容 （LVM）

1.磁盘情况：

[root@localhost ~]# df -Th
文件系统            类型      容量  已用  可用 已用% 挂载点
devtmpfs            devtmpfs  876M     0  876M    0% /dev
tmpfs               tmpfs     895M     0  895M    0% /dev/shm
tmpfs               tmpfs     895M  8.7M  887M    1% /run
tmpfs               tmpfs     895M     0  895M    0% /sys/fs/cgroup
/dev/mapper/cl-root xfs        70G  3.8G   67G    6% /
/dev/sda2           xfs      1014M  213M  802M   21% /boot
/dev/mapper/cl-home xfs       127G  935M  126G    1% /home
/dev/sda1           vfat      599M  7.3M  592M    2% /boot/efi
tmpfs               tmpfs     179M     0  179M    0% /run/user/0

2.缩容home分区

把home分区的空间划一部分到root分区

1.备份home数据：

xfs文件类型 缩容home只能强制缩容，
这一步非常重要。在修改分区之前，请确保备份所有重要数据。

mkdir /root/home
cp /home/*  /root/home

2.查找使用 /home 的进程：

lsof +D /home
例如：
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
bash      1234  user1  cwd   DIR  8,1     4096    2   /home/user1
firefox   5678  user1  mem   REG  8,1    123456   3   /home/user1/.mozilla/firefox/xxxxxx.default/...

3.终止这些进程：

sudo kill -9 1234
sudo kill -9 5678

4.卸载 /home 分区

sudo umount /home

5.强制缩容home系统大小

[root@localhost ~]# lvcreate -L 20G -n home_temp cl Volume group "cl" has insufficient free space (0 extents): 5120 required.
[root@localhost ~]# lvreduce -L 20G /dev/cl/homeWARNING: Reducing active logical volume to 20.00 GiB.THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce cl/home? [y/n]: ySize of logical volume cl/home changed from <126.38 GiB (32353 extents) to 20.00 GiB (5120 extents).Logical volume cl/home successfully resized.

6.强制格式化home分区

[root@localhost ~]# mkfs.xfs -f /dev/cl//home 
meta-data=/dev/cl//home          isize=512    agcount=4, agsize=1310720 blks=                       sectsz=512   attr=2, projid32bit=1=                       crc=1        finobt=1, sparse=1, rmapbt=0=                       reflink=1
data     =                       bsize=4096   blocks=5242880, imaxpct=25=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
Discarding blocks...Done.

7.挂载/home 分区

[root@localhost ~]# mount -a

8.恢复备份数据

sudo cp /root/home/* /home/

3.扩容root分区

1.扩展根分区的逻辑卷

现在我们可以将原本分配给 /home 的空间扩展到 /root 分区：

[root@localhost ~]# lvextend -l +100%FREE /dev/cl/rootSize of logical volume cl/root changed from 70.00 GiB (17920 extents) to <176.38 GiB (45153 extents).Logical volume cl/root successfully resized.

2.对扩展后的文件系统进行调整：

[root@localhost ~]# xfs_growfs /dev/mapper/cl-root
meta-data=/dev/mapper/cl-root    isize=512    agcount=4, agsize=4587520 blks=                       sectsz=512   attr=2, projid32bit=1=                       crc=1        finobt=1, sparse=1, rmapbt=0=                       reflink=1
data     =                       bsize=4096   blocks=18350080, imaxpct=25=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=8960, version=2=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 18350080 to 46236672

3.确认扩展结果

[root@localhost ~]# df -h
文件系统             容量  已用  可用 已用% 挂载点
devtmpfs             876M     0  876M    0% /dev
tmpfs                895M     0  895M    0% /dev/shm
tmpfs                895M  8.7M  887M    1% /run
tmpfs                895M     0  895M    0% /sys/fs/cgroup
/dev/mapper/cl-root  177G  4.5G  172G    3% /
/dev/sda2           1014M  213M  802M   21% /boot
/dev/sda1            599M  7.3M  592M    2% /boot/efi
tmpfs                179M     0  179M    0% /run/user/0
/dev/mapper/cl-home   20G  175M   20G    1% /home
[root@localhost ~]# lvdisplay--- Logical volume ---LV Path                /dev/cl/rootLV Name                rootVG Name                clLV UUID                gX9aeL-1Y8m-tGCz-Euka-YynN-SeY4-ecOMWuLV Write Access        read/writeLV Creation host, time localhost.localdomain, 2024-08-01 23:03:22 -0400LV Status              available# open                 1LV Size                <176.38 GiBCurrent LE             45153Segments               2Allocation             inheritRead ahead sectors     auto- currently set to     8192Block device           253:0--- Logical volume ---LV Path                /dev/cl/homeLV Name                homeVG Name                clLV UUID                dHsXfZ-okNT-82gk-6ed5-oXlP-BxUQ-rQV3xBLV Write Access        read/writeLV Creation host, time localhost.localdomain, 2024-08-01 23:03:22 -0400LV Status              available# open                 1LV Size                20.00 GiBCurrent LE             5120Segments               1Allocation             inheritRead ahead sectors     auto- currently set to     8192Block device           253:2--- Logical volume ---LV Path                /dev/cl/swapLV Name                swapVG Name                clLV UUID                SDh6NB-5tsS-Sdd6-uYpz-ygNi-bKiF-lU5hqnLV Write Access        read/writeLV Creation host, time localhost.localdomain, 2024-08-01 23:03:23 -0400LV Status              available# open                 2LV Size                2.03 GiBCurrent LE             520Segments               1Allocation             inheritRead ahead sectors     auto- currently set to     8192Block device           253:1