Centos扩容

CVM存储在 /var 下，虽然固态硬盘大部分存储空间，都给了 /var ，但是虚拟机多一点，就担心空间不足。于是便通过以下步骤对 /var 进行扩容。

更新--查看磁盘分区情况：

[root@localhost ~]# lsblk
NAME              MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                 8:0    0 447.1G  0 disk 
├─sda1              8:1    0    50M  0 part /boot/efi
├─sda2              8:2    0     1G  0 part /boot
└─sda3              8:3    0 446.1G  0 part 
  ├─centos00-root 253:0    0    80G  0 lvm  /
  ├─centos00-swap 253:1    0    64G  0 lvm  [SWAP]
  └─centos00-var  253:2    0 742.1G  0 lvm  /var
sdb                 8:16   0 447.1G  0 disk 
└─centos00-var    253:2    0 742.1G  0 lvm  /var
sdc                 8:32   0 447.1G  0 disk

1. 查看分区

   [root@localhost ~]# df -hT
   Filesystem              Type      Size  Used Avail Use% Mounted on
   /dev/mapper/centos-root xfs        40G  3.9G   37G  10% /
   devtmpfs                devtmpfs   12G     0   12G   0% /dev
   tmpfs                   tmpfs      12G     0   12G   0% /dev/shm
   tmpfs                   tmpfs      12G   33M   12G   1% /run
   tmpfs                   tmpfs      12G     0   12G   0% /sys/fs/cgroup
   /dev/sdc2               xfs       497M  155M  343M  32% /boot
   /dev/sdc1               vfat       50M   12M   39M  23% /boot/efi
   /dev/mapper/centos-var  xfs       375G  254G  121G  68% /var  # 大小 375G
   tmpfs                   tmpfs     2.4G     0  2.4G   0% /run/user/0
   

2. 查看磁盘编号

   也可以使用 fdisk -l 查看磁盘信息。其中 /dev/sdb 是用于扩容的磁盘。

   [root@localhost ~]# ls /dev/sd*
   /dev/sda  /dev/sdb  /dev/sdc  /dev/sdc1  /dev/sdc2  /dev/sdc3
   

3. 创建pv

   [root@localhost ~]# pvcreate /dev/sdb 
     Physical volume "/dev/sdb" successfully created.
   

4. 查看vg组

   [root@localhost ~]# vgs
     VG     #PV #LV #SN Attr   VSize    VFree
     centos   1   3   0 wz--n- <446.59g    0	# 此时vfree为0
   

5. 扩展vg

   [root@localhost ~]# vgextend centos /dev/sdb 
     Volume group "centos" successfully extended
   

6. 再次查看vg组

   [root@localhost ~]# vgs
     VG     #PV #LV #SN Attr   VSize  VFree  
     centos   2   3   0 wz--n- <1.35t 931.51g 	# 此时vfree为 931.51g
   

7. 扩展lv（+500G）

   [root@localhost ~]# lvextend -L +500G /dev/mapper/centos-var 
     Size of logical volume centos/var changed from <374.59 GiB (95895 extents) to <874.59 GiB (223895 extents).
     Logical volume centos/var successfully resized.
   

8. 系统重新读取大小

   [root@localhost ~]# xfs_growfs /dev/mapper/centos-var 
   meta-data=/dev/mapper/centos-var isize=256    agcount=4, agsize=24549120 blks
            =                       sectsz=512   attr=2, projid32bit=1
            =                       crc=0        finobt=0 spinodes=0
   data     =                       bsize=4096   blocks=98196480, imaxpct=25
            =                       sunit=0      swidth=0 blks
   naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
   log      =internal               bsize=4096   blocks=47947, version=2
            =                       sectsz=512   sunit=0 blks, lazy-count=1
   realtime =none                   extsz=4096   blocks=0, rtextents=0
   data blocks changed from 98196480 to 229268480
   

9. 查看扩容是否成功

   [root@localhost ~]# df -h
   Filesystem               Size  Used Avail Use% Mounted on
   /dev/mapper/centos-root   40G  3.9G   37G  10% /
   devtmpfs                  12G     0   12G   0% /dev
   tmpfs                     12G     0   12G   0% /dev/shm
   tmpfs                     12G   33M   12G   1% /run
   tmpfs                     12G     0   12G   0% /sys/fs/cgroup
   /dev/sdc2                497M  155M  343M  32% /boot
   /dev/sdc1                 50M   12M   39M  23% /boot/efi
   /dev/mapper/centos-var   875G  254G  621G  30% /var		# 大小 375G + 500G = 875G
   tmpfs                    2.4G     0  2.4G   0% /run/user/0