一，Host侧
- 增加虚拟磁盘容量
$ sudo qemu-img resize ubuntu22.qcow2 +32G
- 备份磁盘
$ sudo qemu-img create -b ubuntu22.qcow2 -F qcow2 -f qcow2 ubuntu22-test2.qcow2
- 修改虚机配置，为防止数据丢失，先从备份的磁盘中演练
$ virsh edit ubuntu22
二，Guest侧
2.1 查看当前状态，根目录已经快满了
~$ df -TH
Filesystem Type Size Used Avail Use% Mounted on
tmpfs tmpfs 1.1G 1.6M 1.1G 1% /run
/dev/mapper/vgubuntu-root ext4 63G 60G 489M 100% /
tmpfs tmpfs 5.3G 0 5.3G 0% /dev/shm
tmpfs tmpfs 5.3M 0 5.3M 0% /run/lock
tmpfs tmpfs 4.2M 0 4.2M 0% /sys/fs/cgroup
/dev/vda1 vfat 536M 6.4M 530M 2% /boot/efi
tmpfs tmpfs 1.1G 70k 1.1G 1% /run/user/1000
tmpfs tmpfs 1.1G 66k 1.1G 1% /run/user/128
2.2 查看当前硬盘信息
Disk /dev/vda: 96 GiB
但/dev/vda2和/dev/mapper/vgubuntu-root只有不到60G
$ sudo fdisk -l
GPT PMBR size mismatch (134217727 != 201326591) will be corrected by write.
The backup GPT table is not on the end of the device.
Disk /dev/vda: 96 GiB, 103079215104 bytes, 201326592 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
Disklabel type: gpt
Disk identifier: E80679B8-CF0C-4496-A391-C734EB923502
Device Start End Sectors Size Type
/dev/vda1 2048 1050623 1048576 512M EFI System
/dev/vda2 1050624 134215679 133165056 63.5G Linux LVM
Disk /dev/mapper/vgubuntu-root: 59.84 GiB, 64256737280 bytes, 125501440 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
上面还报GPT PMBR size mismatch (134217727 != 201326591) will be corrected by write.错误
2.3 修复GPT错误
$ sudo parted -l
Kernel not configured for semaphores (System V IPC). Not using udev synchronisation code.
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/vgubuntu-swap_1: 3922MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:
Number Start End Size File system Flags
1 0.00B 3922MB 3922MB linux-swap(v1)
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/vgubuntu-root: 64.3GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:
Number Start End Size File system Flags
1 0.00B 64.3GB 64.3GB ext4
Warning: Not all of the space available to /dev/vda appears to be used, you can
fix the GPT to use all of the space (an extra 67108864 blocks) or continue with
the current setting?
Fix/Ignore?
Fix/Ignore? fix
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 103GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 538MB 537MB fat32 boot, esp
2 538MB 68.7GB 68.2GB lvm
重新用fdisk -l查看错误消失
2.4 /dev/vda2扩容
$ sudo growpart /dev/vda 2
CHANGED: partition=2 start=1050624 old: size=133165056 end=134215680 new: size=200275935 end=201326559
$ sudo resize2fs /dev/vda2
resize2fs 1.46.5 (30-Dec-2021)
resize2fs: Device or resource busy while trying to open /dev/vda2
Couldn't find valid filesystem superblock.
扩容后发现/dev/vda2已增长，但/dev/mapper/vgubuntu-root不变
$ sudo fdisk -l
Disk /dev/vda: 96 GiB, 103079215104 bytes, 201326592 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
Disklabel type: gpt
Disk identifier: E80679B8-CF0C-4496-A391-C734EB923502
Device Start End Sectors Size Type
/dev/vda1 2048 1050623 1048576 512M EFI System
/dev/vda2 1050624 201326558 200275935 95.5G Linux LVM
Disk /dev/mapper/vgubuntu-root: 59.84 GiB, 64256737280 bytes, 125501440 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
2.5 /dev/mapper/vgubuntu-root 扩容
$ sudo lvextend -l +100%FREE /dev/mapper/vgubuntu-root
Size of logical volume vgubuntu/root changed from 59.84 GiB (15320 extents) to 91.84 GiB (23512 extents).
Kernel not configured for semaphores (System V IPC). Not using udev synchronisation code.
Logical volume vgubuntu/root successfully resized.
$ sudo resize2fs /dev/mapper/vgubuntu-root
resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/mapper/vgubuntu-root is mounted on /; on-line resizing required
old_desc_blocks = 8, new_desc_blocks = 12
The filesystem on /dev/mapper/vgubuntu-root is now 24076288 (4k) blocks long.
三，扩容成功
$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 994M 1.5M 992M 1% /run
/dev/mapper/vgubuntu-root 91G 56G 31G 65% /
tmpfs 4.9G 0 4.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroup
/dev/vda1 511M 6.1M 505M 2% /boot/efi
tmpfs 994M 68K 993M 1% /run/user/1000
tmpfs 994M 64K 993M 1% /run/user/128
