Troubleshooting DNS Server

Related to Previous Article: http://amar-linux.blogspot.com/2012/05/configuring-primary-dns-server-on.html

If you are unable to dig properly to your own Test DNS Server (Lab only, not a live DNS Server), here are some tips -

1. Check whether the named service is running.



[root@ns1 named]# service named status
version: 9.7.0-P2-RedHat-9.7.0-5.P2.el6
CPUs found: 1
worker threads: 1
number of zones: 17
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
named (pid  1235) is running...

 



2. Check whether the FQDN is properly set in /etc/sysconfig/network and /etc/hosts



[root@ns1 named]# cat /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=ns1.testdom.inv
GATEWAY=192.168.1.3

[root@ns1 named]# cat /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.13    ns1.testdom.inv    ns1



3. It has to be ensured that the only nameserver IP in /etc/resolv.conf is the IP of the test DNS Server.



[root@ns1 named]# cat /etc/resolv.conf 

nameserver 192.168.1.13



4. Check whether the zone files in /var/named have group ownership of named.



[root@ns1 named]# ls -l /var/named/testdom-*
-rw-r----- 1 root named 325 May 31 11:16 /var/named/testdom-fz
-rw-r----- 1 root named 318 May 31 11:12 /var/named/testdom-rz