公司使用BIND9 作为内部DNS服务器用于日常内外网的域名解析，后期我们也会打算在外网部署DNS服务器用于解析外网服务器的内部域名，为后期自动化运维做好准备。所以对DNS的监控很有必要。
监控原理描述
监控BIND主要通过rndc这个工具来监控，不同版本的BIND，使用rndc显示的信息会有所不同。
[root@www ~]# whereis rndc
rndc: /usr/sbin/rndc /etc/rndc.conf /etc/rndc.key /usr/share/man/man8/rndc.8.gz
[root@www ~]# whatis rndc
rndc (8) - name server control utility
rndc-confgen (8) - rndc key generation tool
rndc.conf [rndc] (5) - rndc configuration file
CentOS5系列默认的BIND版本是9.3，CentOS6系列默认的BIND版本是9.8
[root@www ~]# cat /etc/issue.net
CentOS release 5.10 (Final)
Kernel \r on an \m
[root@www ~]# named -v
BIND 9.3.6-P1-RedHat-9.3.6-20.P1.el5_8.6
[root@www ~]# rndc stats
[root@www ~]# cat /var/named/chroot/var/named/data/named_stats.txt
+++ Statistics Dump +++ (1419998880)
success 59887
referral 0
nxrrset 7457
nxdomain 8143
recursion 36479
failure 2358
--- Statistics Dump --- (1419998880)
[root@test1 ~]# cat /etc/issue.net
CentOS release 6.4 (Final)
Kernel \r on an \m
[root@test1 ~]# named -v
BIND 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.1
[root@test1 ~]# rndc status
version: 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.1
CPUs found: 2
worker threads: 2
number of zones: 19
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is OFF
recursive clients: 0/0/1000
tcp clients: 0/100
server is up and running
[root@test1 ~]# rndc stats
[root@test1 ~]# cat /var/named/data/named_stats.txt
+++ Statistics Dump +++ (1419998423)
++ Incoming Requests ++
++ Incoming Queries ++
++ Outgoing Queries ++
[View: default]
20 A
12 NS
21 AAAA
14 DNSKEY
[View: _bind]
++ Name Server Statistics ++
++ Zone Maintenance Statistics ++
++ Resolver Statistics ++
[Common]
[View: default]
37 IPv4 queries sent
30 IPv6 queries sent
24 IPv4 responses received
36 query retries
13 query timeouts
12 IPv4 NS address fetches
15 IPv6 NS address fetches
3 IPv4 NS address fetch failed
2 IPv6 NS address fetch failed
4 DNSSEC validation attempted
4 DNSSEC validation succeeded
10 queries with RTT 10-100ms
14 queries with RTT 100-500ms
[View: _bind]
++ Cache DB RRsets ++
[View: default]
49 A
11 NS
29 AAAA
8 DS
17 RRSIG
2 DNSKEY
[View: _bind (Cache: _bind)]
++ Socket I/O Statistics ++
38 UDP/IPv4 sockets opened
31 UDP/IPv6 sockets opened
2 TCP/IPv4 sockets opened
2 TCP/IPv6 sockets opened
37 UDP/IPv4 sockets closed
30 UDP/IPv6 sockets closed
11 TCP/IPv4 sockets closed
30 UDP/IPv6 socket connect failures
37 UDP/IPv4 connections established
12 TCP/IPv4 connections accepted
30 UDP/IPv6 send errors
++ Per Zone Query Statistics ++
--- Statistics Dump --- (1419998423)
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