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gdnsd-plugin-null - gdnsd null plugin



gdnsd-plugin-null - gdnsd null plugin


Example null service_types config:
  service_types => {
    my_null_mon => {
      plugin => null,
      # ... other generic service_type params
Zonefile RRs using null resolution
  foo 300 DYNA null
  bar 300 DYNC null!whatever


gdnsd-plugin-null exists mostly as an example of the minimum possible plugin of both types. It is simultaneously both a monitoring plugin and a resolution plugin.
When used as a resolution plugin in "DNYA" or "DYNC" RRs, it ignores any resource name provided. With "DYNA" it always returns the IPv4 address and the IPv6 address "::". With "DYNC" it always returns a CNAME to to the domainname "invalid."
When used as a monitoring plugin by defining a service_type as shown in the example above it emulates the behavior of a real monitoring plugin (updating at correct intervals, etc) but sends a "DOWN" result at every monitoring check interval without actually checking anything.


gdnsd.config(5), gdnsd.zonefile(5), gdnsd(8)
The gdnsd manual. Copyright (c) 2014 Brandon L Black <>
This file is part of gdnsd.
gdnsd is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
gdnsd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with gdnsd. If not, see <>.
2017-07-15 gdnsd 2.2.4