CentOS - Aug 2010 - Slow domain resolution problem

Hi everyone,

I've just joine the list as I am having an issue with our CentOS servers.

The domain resolution is extremely slow from the application but doing 
an nslookup gives an immediate response. All the applications have the 
same issue, as do all the servers.

I have been looking for the solution all over the web and all I have 
found are references to disabling ipv6.
- By setting enable_ipv6 = no in /etc/sysconfig/network, which is 
already done on all the machines.
- By blacklisting the ip6 module, which is not an option as it is used 
by the bonding module. Just for the sake of it, I tried it and, as 
expected, the bonding module did not come back up.

If bad comes to worse, I could set up host entries for the main machines 
in /etc/hosts, but I really am trying to avoid that.

Any suggestions?

Thanks

Gabriel Tabares

>The domain resolution is extremely slow from the application but doing 
>an nslookup gives an immediate response. All the applications have the 
>same issue, as do all the servers.
What does your /etc/nsswitch.conf and /etc/host.conf look like?

Hi everyone,

I am answering this here as  I found a workaround.

I could not solve the solution when using the Juniper as the DNS server, 
so I reverted to using bind and that fixed the issue.

Thanks for the help, everybody.

Regards,

Gabriel
> I've just joine the list as I am having an issue with our CentOS
servers.
>
> The domain resolution is extremely slow from the application but doing
> an nslookup gives an immediate response. All the applications have the
> same issue, as do all the servers.
>
> I have been looking for the solution all over the web and all I have
> found are references to disabling ipv6.
> - By setting enable_ipv6 = no in /etc/sysconfig/network, which is
> already done on all the machines.
> - By blacklisting the ip6 module, which is not an option as it is used
> by the bonding module. Just for the sake of it, I tried it and, as
> expected, the bonding module did not come back up.
>
> If bad comes to worse, I could set up host entries for the main machines
> in /etc/hosts, but I really am trying to avoid that.
>
> Any suggestions?
>
> Thanks
>
> Gabriel Tabares