# Enable full debug logging for monolithic libvirtd # tail
/etc/libvirt/libvirtd.conf log_level = 1 log_filters="1:*"
log_outputs="1:file:/var/log/libvirt/libvirtd.log"
# Enable full debug logging for modular QEMU daemon # tail
/etc/libvirt/virtqemud.conf log_level = 1 log_filters="1:*"
log_outputs="1:file:/var/log/libvirt/virtqemud.log"
# Restart only the daemon architecture currently in use
systemctl restart libvirtd.service # monolithic mode
# OR
systemctl restart virtqemud.service # modular mode
In general, use either:
libvirtd.service for monolithic mode, or virtqemud plus the appropriate modular
supporting daemons for modular mode.
/var/log/libvirt/
├── libvirtd.log # host-wide monolithic daemon log
├── virtqemud.log # host-wide modular QEMU daemon log
└── qemu/
├── vm1.log # VM-specific QEMU process log
├── vm2.log
└── ...
/var/log/libvirt stores host-level libvirt daemon logs, such as libvirtd.log
for monolithic mode or virtqemud.log for modular QEMU mode.
The /var/log/libvirt/qemu directory stores VM-specific QEMU logs.
Therefore, placing virtqemud.log under /var/log/libvirt is appropriate.
The existing logrotate configuration includes /var/log/libvirt/libvirtd.log
through /etc/logrotate.d/libvirtd, and all VM-specific log files matching
/var/log/libvirt/qemu/*.log through /etc/logrotate.d/libvirtd.qemu.
It does not currently include /var/log/libvirt/virtqemud.log; therefore, a
separate logrotate rule must be added for virtqemud.log if that log is enabled.
We should either place virtqemud.log under /var/log/libvirt/qemu/, which is not
appropriate because that directory is intended for VM-specific logs.
The virtqemud.log rotation rule can be added to /etc/logrotate.d/libvirtd.qemu,
or or define a dedicated logrotate rule in a separate file such as
/etc/logrotate.d/virtqemud.
Example rule:
/var/log/libvirt/virtqemud.log {
weekly
missingok
rotate 4
compress
delaycompress
copytruncate
minsize 100k
}
This would provide the same log-management behavior for modular virtqemud file
logging, that is already available for monolithic libvirtd logging.
