记录调整CentOS的分区大小

因为主要使用/root目录，所以/home下的空间需要腾出大部分给/root。下面记录一下操作过程，/home因为没有使用，因此不需要做备份。

初始磁盘分配情况

[root@master01 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G  8.5M  7.8G   1% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/mapper/centos-root   48G  1.6G   47G   4% /
/dev/mapper/centos-home   24G   33M   24G   1% /home
/dev/sda1               1014M  179M  836M  18% /boot
tmpfs                    1.6G     0  1.6G   0% /run/user/0
[root@master01 ~]# 

删除/home

[root@master01 ~]# umount /home
[root@master01 ~]# 
[root@master01 ~]# 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@master01 ~]# 

将多出的空间“充值”给/root

[root@master01 ~]# lvextend -L +22G /dev/mapper/centos-root    
  Size of logical volume centos/root changed from <47.79 GiB (12233 extents) to <69.79 GiB (17865 extents).
  Logical volume centos/root successfully resized.
[root@master01 ~]# 
[root@master01 ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3131648 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=12526592, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6116, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 12526592 to 18293760
[root@master01 ~]# 

量力而行创建/home,貌似不创建重启后无法进入系统

[root@master01 ~]# lvcreate -L 2G -n home centos   
  Volume group "centos" has insufficient free space (342 extents): 512 required.
[root@master01 ~]# 
[root@master01 ~]# lvcreate -L 1G -n home centos 
  Logical volume "home" created.
[root@master01 ~]# 
[root@master01 ~]# 
[root@master01 ~]# mkfs.xfs /dev/centos/home
meta-data=/dev/centos/home       isize=512    agcount=4, agsize=65536 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=262144, 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
[root@master01 ~]# 
[root@master01 ~]# mount /dev/centos/home /home
[root@master01 ~]# 

查看调整后的分区大小，/root从48G扩展为70G

[root@master01 ~]# 
[root@master01 ~]# 
[root@master01 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G  8.5M  7.8G   1% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/mapper/centos-root   70G  1.5G   69G   3% /
/dev/sda1               1014M  179M  836M  18% /boot
tmpfs                    1.6G     0  1.6G   0% /run/user/0
/dev/mapper/centos-home 1014M   33M  982M   4% /home
[root@master01 ~]#