Toolserver:Admin:Wita

wita is a custom backend for PowerDNS. It answers requests based on a configuration file listing hosts, and only returns answers for hosts which are up. It is used for the sql-sX[-fast].toolserver.org aliases.

The configuration is in /global/misc/pdns-auth/wita.conf. Each line contains the group name, followed by the servers in the group. Put a ! in front of a server name to prevent it being returned unless all other servers in the group are down.

To reload the configuration, either restart the pdns-auth resource group, or run pkill -HUP wita.