给 qcow2 格式镜像扩容

Resize the qcow2 image

Poweroff the virtual machine.

Check the size.

$ qemu-img info vm.qcow2
image: vm.qcow2
file format: qcow2
virtual size: 64G (68719476736 bytes)
disk size: 56G
cluster_size: 65536

Resize the image file.

$ qemu-img resize vm.qcow2 +960G
Image resized.

The new size.

$ qemu-img info vm.qcow2
image: vm.qcow2
file format: qcow2
virtual size: 1.0T (1099511627776 bytes)
disk size: 56G
cluster_size: 65536

Resize the partition

Start the virtual machine.

$ virsh start vm

Login and resize lvm group.

$ sudo fdisk /dev/vda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').
 
Command (m for help): p
 
Disk /dev/vda: 14.0 GB, 13958643712 bytes
16 heads, 63 sectors/track, 27046 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c55ce
 
   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *           3        1018      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/vda2            1018       20806     9972736   8e  Linux LVM
Partition 2 does not end on cylinder boundary.
 
Command (m for help): d
Partition number (1-4): 2
 
Command (m for help): p
 
Disk /dev/vda: 14.0 GB, 13958643712 bytes
16 heads, 63 sectors/track, 27046 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c55ce
 
   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *           3        1018      512000   83  Linux
Partition 1 does not end on cylinder boundary.
 
Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (1-27046, default 1): 1018
Last cylinder, +cylinders or +size{K,M,G} (1018-27046, default 27046): 
Using default value 27046

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 8e
Changed system type of partition 2 to 8e (Linux LVM)
 
Command (m for help): p
 
Disk /dev/vda: 14.0 GB, 13958643712 bytes
16 heads, 63 sectors/track, 27046 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c55ce
 
   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *           3        1018      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/vda2            1018       27046    13118160   8e  Linux LVM
 
Command (m for help): w
The partition table has been altered!
 
Calling ioctl() to re-read partition table.
 
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

Reboot the virtual machine.

$ sudo pvdisplay
$ sudo pvresize /dev/vda2
$ sudo pvdisplay

$ sudo lvdisplay
$ sudo lvextend -L+960G /dev/centos/root
$ sudo lvdisplay

Grow xfs partition.

$ sudo xfs_growfs /dev/centos/root