KVM/qemu

Packages

• qemu-kvm-rhev or qemu-kvm
• qemu-kvm-common
• qemu-img-rhev (RHEL) or qemu-utils (Ubuntu). Commands included: qemu-img, qemu-io and qemu-nbd
• qemu-guest-agent, required for virsh domfsfreeze
• qemu-system-x86, binary included: qemu-system-x86_64

Configuration

• /etc/libvirt/qemu/
• /etc/libvirt/qemu.conf
• /var/run/libvirt/qemu

Logs

/var/log/libvirt/qemu/

qemu-system-x86_64: failed to initialize KVM: Cannot allocate memory

Basic Commands

• qemu-img info -U /srv/libvirt/YOUR_IMAGE_NAME.qcow2

image: /srv/libvirt/YOUR_IMAGE_NAME.qcow2
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 5.5G
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: true
    refcount bits: 16
    corrupt: false

• qemu-img snapshot

See also

• wikipedia:QEMU
• https://en.wikibooks.org/wiki/QEMU
• RHV
• KVM/libvirt, virsh
• qemu-img
• qemu-ga
• Virtio