Virtual machine capacity expansion (/dev/mapper/centos-root insufficient space)

1: First Look at what our root partition size is

DF -H

文件系统                类型      容量  已用  可用 已用% 挂载点 /dev/mapper/centos-root xfs        18G  1.1G   17G    6% / devtmpfs                devtmpfs  479M     0  479M    0%  /dev tmpfs                   tmpfs     489M     0  489M    0%  /dev/shm tmpfs                   tmpfs     489M  6.7M  483M    2%  /run tmpfs                   tmpfs     489M     0  489M    0%  /sys/fs/cgroup /dev/sda1 xfs       497M  125M  373M   25%  /boot tmpfs                   tmpfs      98M     0   98M    0%  /run/user/0
2: Add a Physical disk to the virtual machine and restart the virtual machine. 3: View disk number

ls /dev/sd*

/dev/sda/dev/sda1  /dev/sda2/dev/sdb

4: Create PV

Pvcreate/dev/sdb

Physical volume "/dev/sdb"successfully created

5: Add PV to the VG, equivalent to expand the size of the VG

Use VGS to view the VG group first

VGs

VG #PV #LV #SN Attr vsize vfree
CentOS 2 2 0 wz--n-59.50g 20.04g

Extended VG, using the Vgextend command

Vgextend Centos/dev/sdb

6: We have successfully expanded the VG volume and looked at it with VGS

VGs

VG      #PV #LV #SN Attr   VSize  VFree centos   2   2   0 wz--n- 39.50g 20.04g

Lvs

LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert

   root centos -wi-ao---- 17.47g                                                       swap centos -wi-ao----  2.00g  虽然我们把vg扩展了，但是lv还没有扩展7: Extended LV, using the lvextend command

Lvextend-l +20g/dev/mapper/centos-root

Size of logical volume centos /root changed from 17.47 GiB (4472 extents) to 37.47 GiB (9592 extents). Logical volume root successfully resized8: Command to re-read the system size

Xfs_growfs/dev/mapper/centos-root

meta-data= /dev/mapper/centos-root isize=256    agcount=4, agsize=1144832 blks           =                       sectsz=512   attr=2, projid32bit=1           =                       crc=0        finobt=0 data     =                       bsize=4096   blocks=4579328, imaxpct=25           =                       sunit=0      swidth=0 blks naming   =version 2              bsize=4096   ascii-ci=0 ftype=0 log      =internal               bsize=4096   blocks=2560, version=2           =                       sectsz=512   sunit=0 blks, lazy-count=1 realtime =none                   extsz=4096   blocks=0, rtextents=0 data blocks changed from 4579328 to 98222089: Re-use Df-h view

DF -H

文件系统                 容量  已用  可用 已用% 挂载点 /dev/mapper/centos-root 38G  1.1G   37G    3% / devtmpfs                 479M     0  479M    0%  /dev tmpfs                    489M     0  489M    0%  /dev/shm tmpfs                    489M  6.7M  483M    2%  /run tmpfs                    489M     0  489M    0%  /sys/fs/cgroup /dev/sda1 497M  125M  373M   25%  /boot tmpfs                     98M     0   98M    0%  /run/user/0

Virtual machine capacity expansion (/dev/mapper/centos-root insufficient space)