Running Virtual Instances

It may be advantageous to run multiple separate PowerDNS installations on a single host, for example to make sure that different customers cannot affect each others zones. PowerDNS fully supports running multiple instances on one host.

To generate additional PowerDNS instances, create a pdns-NAME.conf in your configuration directory (usually /etc/powerdns), where NAME is the name of your virtual configuration.

Following one of the following instructions, PowerDNS will read its configuration from the pdns-NAME.conf instead of pdns.conf.

Starting virtual instances with Sysv init-scripts

Symlink the init.d script pdns to pdns-NAME, where NAME is the name of your virtual configuration.

Warning

NAME must not contain a ‘-‘ as this will confuse the script.

Internally, the init script calls the binary with the config-name option set to name, setting in motion the loading of separate configuration files.

When you launch a virtual instance of PowerDNS, the pid-file is saved inside socket-dir as pdns-name.pid.

Warning

Be aware however that the init.d force-stop will kill all PowerDNS instances!

Starting virtual instances with systemd

With systemd it is as simple as calling the correct service instance. Assuming your instance is called myinstance and pdns-myinstance.conf exists in the configuration directory, the following command will start the service:

systemctl start pdns@myinstance.service

Similarly you can enable it at boot:

systemctl enable pdns@myinstance.service