CentOS_7给root目录扩容实践记录

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前言：在实际工作中常遇到类似问题，所以特做一次实践，记录下来供大家参考。

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环境：centOS 7 虚拟机
配置：1CPU 2G内存 200G硬盘

1.查看分区

[root@test ~]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root   50G 1020M   49G   2% /
devtmpfs             901M     0  901M   0% /dev
tmpfs                912M     0  912M   0% /dev/shm
tmpfs                912M  8.6M  904M   1% /run
tmpfs                912M     0  912M   0% /sys/fs/cgroup
/dev/sda1           1014M  139M  876M  14% /boot
/dev/mapper/cl-home  147G   33M  147G   1% /home
tmpfs                183M     0  183M   0% /run/user/0

[root@test ~]# fdisk -l

Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000b8796

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   419430399   208665600   8e  Linux LVM

Disk /dev/mapper/cl-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/cl-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/cl-home: 157.8 GB, 157831659520 bytes, 308264960 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

2.终止占用/home进程
a.安装psmisc

[root@test ~]# yum -y install psmisc

b.使用fuser命令

[root@test ~]# fuser -m -v -i -k /home​

3.卸载/home

[root@test ~]# umount /home

4.删除/home所在的lv

[root@test ~]# lvremove /dev/mapper/cl-home 
Do you really want to remove active logical volume cl/home? [y/n]: y
  Logical volume "home" successfully removed

5.扩展/root所在的lv，增加100G

[root@test ~]# lvextend -L +100G /dev/mapper/cl-root 
  Size of logical volume cl/root changed from 50.00 GiB (12800 extents) to 150.00 GiB (38400 extents).
  Logical volume cl/root successfully resized.

6.扩展/root文件系统

[root@test ~]# xfs_growfs /dev/mapper/cl-root 
meta-data=/dev/mapper/cl-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 39321600

7.重新创建home的lv

[root@test ~]# lvcreate -L 40G -n home cl
  Logical volume "home" created.

8.创建文件系统

[root@test ~]# mkfs.xfs /dev/cl/home 
meta-data=/dev/cl/home           isize=512    agcount=4, agsize=2621440 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=10485760, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=5120, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

9.挂载/home

[root@test ~]# mount /dev/cl/home /home

10.还原/home相关文件以及对应目录权限

[root@test ~]# chmod -R 755 /home

11.结果展现，可以看到/dev/mapper/cl-root已经由50G变为了150G

[root@test ~]# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root  150G  1.1G  149G   1% /
devtmpfs             901M     0  901M   0% /dev
tmpfs                912M     0  912M   0% /dev/shm
tmpfs                912M  8.6M  904M   1% /run
tmpfs                912M     0  912M   0% /sys/fs/cgroup
/dev/sda1           1014M  139M  876M  14% /boot
tmpfs                183M     0  183M   0% /run/user/0
/dev/mapper/cl-home   40G   33M   40G   1% /home