setting and monitoring dns cache master / slave pair
ingrogger at gmail.com
Mon Jul 6 19:39:52 UTC 2015
Hi , guys after reading some documentation about setting my master /
slave dns cache cluster, I stil have some doubts.
Im setting a master / slave dns cache cluster to provide dns service to
internal users on my company having redundancy.
Here the questions:
1)If Im not authoritative for any domain, then it is not necessary to
declare any zone ?
2)If I dont declare any zone , master and slave configuration are
identical for a dns cache server?
3)Does it have any drawbacks no declaring any zone file in the long term?
Most important parameters to check periodically to confirm proper
function and good performace.
I would like to write a parser script so I can plot statistics on cacti
but can not find any docs about the statistics dump output for ver 9.8.2.
So; Following this is what I understand:
[root at centos_8664_pri data]# cat named_stats.txt
+++ Statistics Dump +++ (1436204330)
++ Incoming Requests ++
625 QUERY #total incoming request from
my allowed clients => shoud be in the graph, can represents server load.
++ Incoming Queries ++ # Incoming queries from my allowed
clients divided by RR type
++ Outgoing Queries ++
[View: local_network] # Outgoing queries from my
server to others dns divided by RRs type.
++ Name Server Statistics ++ #witch is bind view ? Is it defined
625 IPv4 requests received # Are these
queries divided by query type from my server to other servers?
625 responses sent
582 queries resulted in successful answer
621 queries resulted in non authoritative answer
39 queries resulted in nxrrset
4 queries resulted in SERVFAIL
448 queries caused recursion
++ Zone Maintenance Statistics ++
++ Resolver Statistics ++
[View: local_network] #again my local_network definition ?
1434 IPv4 queries sent
199 IPv6 queries sent
1373 IPv4 responses received
65 NXDOMAIN received
6 truncated responses received
305 query retries #queries from
where to where ?
87 query timeouts # timeouts
received by my clients while using my dns ? or by my server while trying
to resolve ?
245 IPv4 NS address fetches #all parameters
here seems interesting but , not sure what they are.
252 IPv6 NS address fetches
6 IPv4 NS address fetch failed
84 IPv6 NS address fetch failed
721 DNSSEC validation attempted
530 DNSSEC validation succeeded
191 DNSSEC NX validation succeeded
333 queries with RTT 10-100ms
1032 queries with RTT 100-500ms
8 queries with RTT 500-800ms
++ Cache DB RRsets ++
[View: local_network (Cache: local_network)]
677 A # cache hits ?
[View: _bind (Cache: _bind)] # Also not sure if it
is relevant information.
++ Socket I/O Statistics ++
1431 UDP/IPv4 sockets opened
200 UDP/IPv6 sockets opened
10 TCP/IPv4 sockets opened
2 TCP/IPv6 sockets opened
1428 UDP/IPv4 sockets closed
199 UDP/IPv6 sockets closed
7 TCP/IPv4 sockets closed
199 UDP/IPv6 socket connect failures
1428 UDP/IPv4 connections established
5 TCP/IPv4 connections established
2 TCP/IPv4 connections accepted
199 UDP/IPv6 send errors
++ Per Zone Query Statistics ++
More information about the bind-users