Control panel logs
/opt/ispsystem/dnsmanager6/var/dnsmgr.log — main log
PowerDNS configuration file
CentOS: /etc/pdns/pdns.conf
Ubuntu: /etc/powerdns/pdns.conf
PowerDNS domain zone records
The records are stored in MySQL tables, a separate database for every name space. The default space is powerdns for CentOS and pdns for Ubuntu.
PowerDNS logs
CentOS: /var/log/messages
Ubuntu: /var/log/syslog