KVM Virtualization

1# Ubuntu / Debian
2sudo apt-get update
3sudo apt-get install -y qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virt-manager
4 
5# RHEL / Fedora
6sudo dnf install -y @virtualization
7sudo systemctl enable --now libvirtd
8 
9# Add user to libvirt group
10sudo usermod -aG libvirt $USER
11sudo usermod -aG kvm $USER

1egrep -c '(vmx|svm)' /proc/cpuinfo   # should be > 0
2kvm-ok                                    # Ubuntu
3lsmod | grep kvm
4virsh list --all

1sudo nano /etc/netplan/01-bridge.yaml
2 
3# network:
4#   version: 2
5#   ethernets:
6#     enp0s3:
7#       dhcp4: no
8#   bridges:
9#     br0:
10#       interfaces: [enp0s3]
11#       dhcp4: yes
12 
13sudo netplan apply
14ip addr show br0

1# Download ISO first, then:
2sudo virt-install \
3  --name ubuntu-vm \
4  --ram 2048 \
5  --disk path=/var/lib/libvirt/images/ubuntu.qcow2,size=20 \
6  --vcpus 2 \
7  --os-variant ubuntu22.04 \
8  --network bridge=br0 \
9  --graphics vnc,listen=0.0.0.0 \
10  --cdrom /path/to/ubuntu-22.04.iso
11 
12# Or use GUI:
13virt-manager

1virsh list --all
2virsh start ubuntu-vm
3virsh shutdown ubuntu-vm
4virsh destroy ubuntu-vm      # force stop
5virsh console ubuntu-vm
6virsh dumpxml ubuntu-vm > vm-backup.xml

1sudo systemctl status libvirtd
2virsh net-list --all
3virsh pool-list --all

1# Snapshot
2virsh snapshot-create-as ubuntu-vm snap1 "before upgrade"
3 
4# Clone
5virt-clone --original ubuntu-vm --name ubuntu-vm-clone --auto-clone
6 
7# Export/import
8virsh dumpxml ubuntu-vm > ubuntu-vm.xml
9virsh define ubuntu-vm.xml