Libvirt
libvirt[1] 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
- 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
- libvirtd:
Config files and directories
- Config directories:
- 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
- Images directory:
/var/lib/libvirt/images(See:virsh pool-define-as) - Logs:
/var/log/libvirt/qemujournalctl -u libvirtd
Journalctl errors
libvirtd[14189]: 2019-11-21 15:08:13.035+0000: 14192: error : qemuDomainBlockCommit:17568 : invalid argument: top '/path/to/file/VM_NAME.qcow2' in chain for 'hda' has no backing file
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
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
- 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 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 - MacVTap
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