How to enable unbound logs.

Add these line in /etc/unbound/unbound.conf.

chroot: ""
logfile: /var/log/unbound.log
verbosity: 4
log-queries: yes

Create the log file and set permissions.

touch /var/log/unbound.log
chown unbound:unbound /var/log/unbound.log

Restart the unbound service.

systemctl restart unbound

Check status.

systemctl status unbound

Finally, check the logs.

tail -f /var/log/unbound.log