Overview of QEMU-KVM

・ libvirt

KVM Architecture

Quick Commands

# List all supported operating systems.
osinfo-query os

# Hot add/remove disk.
qemu-img create -f qcow2 /var/lib/libvirt/images/vm1-02.qcow2 5G
virsh attach-disk vm1 /var/lib/libvirt/images/vm1-2.qcow2 vdb --subdriver qcow2 --live --config
virsh detach-disk vm1 vdb --live --config

# SELinux
setsebool -P virt_use_nfs 1

Tips

Press CTRL + ] to escape VM.

Create VM

qemu-system-ppc64 -cpu POWER8 -machine pseries -m 4096 -serial stdio \
-drive file=/mnt/d/Qemu/AIX_v7.2/hdisk0.qcow2,if=none,id=drive-virtio-disk0 \
-drive file=/mnt/d/Qemu/AIX_v7.2/hdisk1.qcow2,if=none,id=drive-virtio-disk1 \
-device virtio-scsi-pci,id=scsi \
-device scsi-hd,drive=drive-virtio-disk0 \
-device scsi-hd,drive=drive-virtio-disk1 \
-cdrom /mnt/e/Downloads/AIX_v7.2_Install_7200-03-03-1913_DVD_1_of_2_052019.iso \
-prom-env "boot-command=boot disk:" \
-net nic,macaddr=56:44:45:30:31:32 -net tap,script=no,ifname=tap0

Migration

virsh pool-define-as vm dir --target "/vm"
virsh pool-autostart vm
virsh pool-start vm
virsh pool-list
virsh migrate vm1 qemu+ssh://kvm02/system --live --persistent --undefinesource --copy-storage-all --verbose

Foreign mount

libguestfs-tools

virt-df -h -d vm1
virt-filesystems -d vm1
guestmount -d vm1 -m /dev/centos/root --rw /mnt
guestunmount /mnt