QEMU

wikipedia:QEMU (Fabrice Bellard)

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. Includes qemu-ga binary. Package required for virsh domfsfreeze
• qemu-system-x86, binary included: qemu-system-x86_64

Configuration

• /etc/libvirt/qemu/VM_NAME.xml
• /etc/libvirt/qemu.conf (VNC, spice configurations, security_driver)
• /etc/libvirt/qemu/networks/default.xml

• /var/run/libvirt/qemu/

QEMU Logs

• /var/log/libvirt/qemu/
• qemu-system-x86_64: failed to initialize KVM: Cannot allocate memory

• -smp 2,sockets=2,cores=1,threads=1

systemctl status qemu-kvm

No VM guests are running outdated hypervisor (qemu) binaries on this host.

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
• qemu-nbd
• qemu-io
• qemu-ga

Related terms

• https://en.wikibooks.org/wiki/QEMU
• Repo: git.qemu.org/git/qemu.git
• qemu-system-arm package in Ubuntu that provides QEMU full system emulation binaries (arm)
• Amazon Firecracker
• qemu-user package
• virt-host-validate
• qemu: uncaught target signal 11 (Segmentation fault) - core dumped
• uses: docker/setup-qemu-action

See also

• KVM, Installation, QEMU, virsh, virtinst, libguestfs-tools, libvirt, qemu, Red Hat Virtualization (RHV), MacVTap, Virtio, oVirt, KVM services, KVM networking, KVM graphics, CPU, KVM on ARM
• QEMU: qemu-img, qemu-ga, qemu.conf, virsh qemu, QEMU guest agent (qemu-ga), qcow2, qemu-nbd, qemu-img map, qemu-io, /etc/libvirt/qemu.conf, QEMU releases, VENOM, qemu-nbd --help, qemu-system, uses: docker/setup-qemu-action
• Virtio, Install virtio-win

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