libvirt / KVM Cheatsheet

notes.txt

List Partitions in a QCOW2:

virt-filesystems -a /var/lib/libvirt/images/vpod1.qcow2 -l

Mount a Specific Partition from qcow2:
guestmount --ro -a /var/lib/libvirt/images/vpod1.qcow2 -m /dev/vg_ifc0/root /mnt/gm

guestunmount /mnt/gm

Create/Attach/Detach Disks:

# Create a disk of 22G
qemu-img create -f qcow2 /var/lib/libvirt/images/vmname-vdb.qcow2 22000M -o preallocation=full

## disk image is /var/lib/libvirt/images/vmname-vdb.qcow2
## VM name is "vmname"
## destination is /dev/vdb
virsh attach-disk --domain vmname /var/lib/libvirt/images/vmname-vdb.qcow2 --target vdb --persistent --config --live

## Undo the above cmd
virsh detach-disk --domain vmname /var/lib/libvirt/images/vmname-vdb.qcow2 --persistent --config --live


# Creating Cfg Disk
rm /var/lib/libvirt/images/cfg.qcow2
qemu-img create -f qcow2 /var/lib/libvirt/images/cfg.qcow2 2M -o preallocation=full
parted /var/lib/libvirt/images/cfg.qcow2 --script -- mklabel gpt                  
parted -a optimal /var/lib/libvirt/images/cfg.qcow2 --script -- mkpart primary ext2 1024KiB 4702s

sudo losetup -f /var/lib/libvirt/images/cfg.qcow2 
sudo losetup -o 1048576 -f /dev/loop0
sudo mkfs.ext2 /dev/loop1 256

sudo losetup -d /dev/loop1
sudo losetup -d /dev/loop0
parted /var/lib/libvirt/images/cfg.qcow2 --script -- print unit s


Add Network IF:
virsh attach-interface --domain vpod2 --type network --source default --model virtio --mac 52:53:54:55:56:57 --config --live

virsh detach-interface vpod2 --type network --mac 52:53:54:55:56:57


https://www.cyberciti.biz/faq/how-to-install-kvm-on-centos-7-rhel-7-headless-server/
https://blog.programster.org/kvm-cheatsheet