使用 virt-filesystems 查看当前的虚拟机的磁盘分区的情况。 可以看到磁盘 /dev/sda 分成两个分区，分别是 /dev/sda1, /dev/sda2。
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$ virt-filesystems -h --all --logical-volumes --long -a centos9.qcow2
Name Type VFS Label MBR Size Parent
/dev/sda1 filesystem xfs - - 1014M -
/dev/cs_centos9/home filesystem xfs - - 19G -
/dev/cs_centos9/root filesystem xfs - - 38G -
/dev/cs_centos9/swap filesystem swap - - 5.9G -
/dev/cs_centos9/home lv - - - 19G /dev/cs_centos9
/dev/cs_centos9/root lv - - - 38G /dev/cs_centos9
/dev/cs_centos9/swap lv - - - 5.9G /dev/cs_centos9
/dev/cs_centos9 vg - - - 63G /dev/sda2
/dev/sda2 pv - - - 63G -
/dev/sda1 partition - - 83 1.0G /dev/sda
/dev/sda2 partition - - 8e 63G /dev/sda
/dev/sda device - - - 64G -
我们使用下面的命令将整个虚拟机磁盘扩大 2G。
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$ qemu-img resize centos9.qcow2 +2G
Image resized.
将新增的磁盘扩展到 /dev/sda2。注意，上面添加的是 2G 的空间，这里如果还用 2G 会提示空间不足。 举例如下：
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root@dragon:/var/lib/libvirt/images# virt-resize --resize /dev/sda2=+2G --expand /dev/sda2 --LV-expand /dev/cs_centos9/root centos9.qcow2 centos9-n.qcow2
[ 0.0] Examining centos9.qcow2
virt-resize: error: You cannot use --expand when there is no surplus space
to expand into. You need to make the target disk larger by at least 1.2M.
If reporting bugs, run virt-resize with debugging enabled and include the
complete output:
virt-resize -v -x [...]
因此，我们我们下面的参数用的是 1800M，而不是 2G。 但是可能会遇到下面这样的错误
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$ sudo virt-resize --resize /dev/sda2=+1800M --expand /dev/sda2 --LV-expand /dev/cs_centos9/root centos9.qcow2 centos9-n.qcow2
[ 0.0] Examining centos9.qcow2
virt-resize: error: /dev/sda2: this partition has already been marked for
resizing
If reporting bugs, run virt-resize with debugging enabled and include the
complete output:
virt-resize -v -x [...]
如果遇到这样的错误，可以去掉 –resize
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sudo virt-resize --expand /dev/sda2 --LV-expand /dev/cs_centos9/root centos9.qcow2 centos9-n.qcow2
[ 0.0] Examining centos9.qcow2
**********
Summary of changes:
/dev/sda1: This partition will be left alone.
/dev/sda2: This partition will be resized from 63.0G to 67.0G. The LVM PV
on /dev/sda2 will be expanded using the ‘pvresize’ method.
/dev/cs_centos9/root: This logical volume will be expanded to maximum size.
The filesystem xfs on /dev/cs_centos9/root will be expanded using the
‘xfs_growfs’ method.
**********
[ 4.3] Setting up initial partition table on centos9-n.qcow2
