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Old 03-24-2008, 06:10 PM   #1
aspasia
LQ Newbie
 
Registered: Mar 2008
Posts: 1

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Unhappy Newbie DNS server & /etc/resolv.conf problem (CentOS 5.x)


Hello all,

I am a newbie and would like to clarify the following; but first a quick summary of my simple DNS configuration:


My setup is simple - just a QA lab environment, my initial setup are just 3 hosts:

qatest2 - 192.168.17.2 (DNS server Bind9 on CentOS 5.1)
qatest1 - 192.168.17.1 (DHCP server)
qatest3 - 192.168.17.3

domain name: lab.mycompany.com

1. I used the Bind Tool to create the default files; and automatically
"import" the /etc/hosts file of qatest2 - which contains the IP, FQDN and
hostname of a all 3 hosts.
2. Added via GUI a "forwarder" option with the IP address of the DNS server of our corporate network which is.
... So that is the simple setup.

At this point, I believe that I have setup a DNS "standard DNS server" (not a Caching Server) (pls correct me if my assumption is wrong.

My question now:

1. I would need to also configure my DNS server (qatest2) so that its /etc/resolv.conf file will contain its own IP as its DNS server, am I right?

2. I tried to do this via the GUI -> Network GUI Settings. I click on the DNS tab and enter the configuration:

hostname - qatest2
Primary DNS - 192.168.17.2
Search - lab.mycompany.com

3. Upon restarting my network services OR even rebooting the host, the /etc/resolv.conf file is not updated accurately!

a. The /etc/resolv.conf does not reflect the changes I performed in the GUI:

cat /etc/resolv.conf
# generated by NetworkManager, do not edit!
; Use a local caching nameserver controlled by NetworkManager
nameserver 127.0.0.1

b. Obviously the nslookups do not work and give me NXDOMAIN outputs.

c. The named status shows it is running:

[root@qatest2 ~]# service named status
number of zones: 8
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is OFF
recursive clients: 0/1000
tcp clients: 0/100
server is up and running

d. If I try to edit the /etc/resolv.conf manually; of course it works; but whenever I reboot the file is overwritten by the so-called "Network Manager".

What is the proper way to configure a simple DNS server in CentOS 5.x (or RHEL 5 for that matter?); and how to correctly configure /etc/resolv.conf?

thanks in advance.

aspasia.




>
> I'm still testing WITHIN the lab.mycompany.com domain. My first question
> (sorry but I sort of forgot):
>
> 1. Do I have to configure an /etc/resolv.conf file for the DNS server
> itself? Seems like my GUI tool did not create one ...
>
> 2. Should the /etc/resolv.conf file of the DNS SERVER contain the following
> entries:
>
 
  


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