Libvirt

libvirt is a virtualization API with supports for KVM, QEMU, Xen, Virtuozzo, VMWare ESX, LXC, BHyve and more

Ubuntu packages

At least the following packages compose libvirt in Ubuntu:

• libvirt-bin (dpkg -s This is a transitional package. You can safely remove it)
• libvirt-clients: virsh, virt-admin, virt-host-validate, virt-login-shell, virt-pki-validate, virt-xml-validate
• libvirt-daemon:

libvirtd: /etc/libvirt/virtlogd.conf

virt-sanlock-cleanup

virtlockd

virtlogd (systemctl status libvirtd)

• libvirt-daemon-system

systemctl status libvirt-guests

Config files and directories

• Config directories:

/etc/libvirt/

/etc/libvirt/storage/ (In Ubuntu there is no default pool. Folder will be automatically created with first pool)

/etc/libvirt/qemu.conf

/etc/libvirt/qemu/XML_FILES_FROM_SERVERS.XML

/etc/libvirt/qemu/networks

• Config files:

/etc/libvirt/virtlogd.conf

Includes information about Unix Socket permissions: unix_sock_group, unix_sock_ro_perms, unix_sock_rw_perms, auth_unix_ro, auth_unix_rw

/etc/libvirt/libvirtd.conf

• Images directory: /var/lib/libvirt/images (See: virsh pool-define-as)
• Logs:

/var/log/libvirt/qemu

journalctl -u libvirtd

systemctl status libvirtd

systemctl restart libvirtd

• Information

libvirtd --help, the daemon will print out the paths of the Unix domain socket(s) that it listens on

Activities

Basic

• Read Libvirt Changelog: https://libvirt.org/git/?p=libvirt.git;a=log
• Read Libvirt Release notes: https://libvirt.org/news.html
• Read Libvirt FAQ: https://wiki.libvirt.org/page/FAQ
• Install KVM in an Ubuntu Server following https://help.ubuntu.com/community/KVM/Installation instructions:

Medium

• Restart libvirtd daemon: systemctl restart libvirtd

Advanced:

• Read Libvirt code: https://github.com/libvirt/libvirt
• Implement uptime functionality in libvirt code: https://www.spinics.net/linux/fedora/libvir/msg98027.html
• Review libvirt error messages in journald
• Understand different CPU model an topologies: https://libvirt.org/formatdomain.html#elementsCPU

See also

• MacVTap
• libvirt, virtlogd.conf, /etc/libvirt/storage/, libvirt-guests.sh, /etc/libvirt/virtlogd.conf, /var/lib/libvirt/images/
• virsh: Storage information, Connecting, Operations, Memory, Snapshots, Networking, CPU, release notes, virsh nodedev-list
• 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
• 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

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Source: https://en.wikiversity.org/wiki/KVM/libvirt