focal (8) gdnsd-plugin-extfile.8.gz

Provided by: gdnsd_2.4.2-1_amd64 bug

NAME

       gdnsd-plugin-extfile - gdnsd plugin for importing monitor data via file

SYNOPSIS

       Example service_types config:

         service_types => {
           ext1 => {
             plugin => "extfile",
             file => "/var/tmp/ext1data", # required
             direct => true, # default false
             def_down => false, # default false
             def_ttl => 600, # default max (limited by zonefile RRs)
           }
           ext2 => {
             plugin => "extfile",
             file => "ext2data", # def dir: /var/lib/gdnsd/extfile/
           },
         }

       Example plugin config using these service_types:

         plugins => {
           multifo => {
             www1 => {
               service_types => ext2,
               lb01 => 192.0.2.200,
               lb02 => 192.0.2.201,
               lb03 => 192.0.2.202,
             }
             www2 => {
               service_types => [ ext1, http_status ],
               lb01 => 192.0.2.203,
               lb02 => 192.0.2.204,
               lb03 => 192.0.2.205,
             }
           },
           weighted => {
             wwwcn => {
               service_types => ext1,
               lb01 = [ lb01.example.com., 99 ],
               lb02 = [ lb02.example.com., 15 ],
               lb03 = [ lb03, 1 ],
             }
             wwwz => {
               service_types => ext1,
               lb01 => [ 192.0.2.203, 10 ],
               lb02 => [ 192.0.2.204, 15 ],
               lb03 => [ 192.0.2.205, 20 ],
             }
           }
         }

       Example extfile data defining the resource + service_types specified above:

         /var/tmp/ext1data:
           192.0.2.203 => UP/300
           192.0.2.204 => DOWN/242
           192.0.2.205 => DOWN/102
           lb01.example.com. => UP/60
           lb02.example.com. => UP/30
           lb03 => UP/45

         /var/lib/gdnsd/extfile/ext2data:
           192.0.2.200 => DOWN
           192.0.2.201 => UP
           192.0.2.202 => UP

DESCRIPTION

       gdnsd-plugin-extfile is a monitor plugin that imports monitor results from an external file (which is
       probably populated by some script/tool from some other monitoring software).

MODES

       An extfile service_type can operate in one of two basic modes:

       Monitor Mode (default)
           In monitor mode, the standard parameter "interval" is used as a repeating timer.  At each interval,
           the file is loaded for state updates (but any direct TTL values in the file are ignored).

           The updates from the file are fed into the standard core monitoring system by the same mechanisms as
           normal monitoring plugins (e.g. http_status).  This means they will be subject to the standard anti-
           flap measures via the standard threshold parameters ("up_thresh", "down_thresh", "ok_thresh") before
           affecting the final status seen by resolution plugins.

           This mode is appropriate if the updates being processed are relatively-raw updates from individual
           monitor checks.

       Direct Mode
           In direct mode, the standard parameter "interval" is used only as a hint to the filesystem-watching
           code to try to check for updates no less often than the supplied interval.  However in many cases
           (especially e.g. Linux with "inotify()" support) updates to the file may be picked up much sooner,
           perhaps nearly instantly.

           There will be a short (~1 second) settling delay after detecting any update in order to coalesce any
           rapid-fire updates into a single transaction.

           The results contained in the file (state and/or TTL per-resource) are applied directly as final
           monitoring results and made immediately available to resolution plugins for decision-making.

           This mode is appropriate if the updates are from processed monitoring results that have already been
           through e.g. anti-flap measures before reaching gdnsd.

FILE FORMAT

       The file is formatted using the same "vscf" language that's used for the main config file and the geoip
       nets databases.  The expected data format is a simple key-value hash at the top level, where the keys are
       the monitored IP address or CNAME values from the monitor plugins and the values are of the form form
       "state[/ttl]", where state is either "UP" or "DOWN" and the optional ttl is an integer ttl value.  TTL
       values are only used for "direct"-mode service_types; the TTL is calculated in the normal fashion based
       on intervals and thresholds for "monitor"-mode.

CONFIGURATION - PER-SERVICE-TYPE

       The universal, plugin-neutral service_type parameters all apply in their usual sense: "up_thresh",
       "ok_thresh", "down_thresh", and "interval" (keeping in mind the notes above about how each mode uses
       "interval").  "timeout" is ignored.  extfile-specific parameters:

       direct
           Boolean, default false.  Sets the monitoring mode to "direct" if true, otherwise mode defaults to
           "monitor".

       file
           String filename, required.  This sets the name of the file to load results from.  If the pathname is
           not absolute, it will be considered relative to /var/lib/gdnsd/extfile/.

       def_ttl
           Integer TTL, default is max (which will be limited by zonefile RR TTL values).  In "direct" mode this
           will be set as the monitored TTL if no optional TTL is supplied in the file data for a given
           resource.  It is ignored in "monitor" mode.

       def_down
           Boolean, default false.  This sets the default disposition of configured resources which are missing
           from the file data (which will generate warnings).  If true, these resources behave as if the file
           data marked them "DOWN", otherwise they default to "UP".

SEE ALSO

       gdnsd.config(5), gdnsd(8)

       The gdnsd manual.

       Copyright (c) 2012 Brandon L Black <blblack@gmail.com>

       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
       <http://www.gnu.org/licenses/>.