how to check whether DNS is configured on my os(CentOS)

rushikeshgaradade · 03-20-2013, 04:02 AM

how to check whether DNS is configured on my os(CentOS)

or is it by default configured on intallation

if not configured then how to configure it..

and also for Reverse DNS....

acid_kewpie · 03-20-2013, 04:32 AM

what does that mean? As a client or as a server?

rushikeshgaradade · 03-20-2013, 04:48 AM

for server......

Actually i am trying to install HDP in that there is one step saying "All hosts in your system must be configured for DNS and Reverse DNS."

i just want to resolve above query

acid_kewpie · 03-20-2013, 04:55 AM

So I guess you don't know what that means then.

I would read that any client in this solution (no idea what HDP is btw.) Will need to be able to resolve appropriate names in the solution to IP addresses and also be able to convert IP's back to hostnames. This could be from local /etc/hosts file entries, or from a dedicated DNS server such as BIND

btw, you might want to say please or thank you next time.

shivaa · 03-20-2013, 05:29 AM

Can you check following file on your system. Are there name servers' defined in it or not?

Code:

~$ cat /etc/resolv.conf

rushikeshgaradade · 03-20-2013, 05:37 AM

Sorry for that.....

HDP stands for Hortonworks Data Platform....

please tell me how to check or configure DNS

rushikeshgaradade · 03-20-2013, 05:46 AM

@shivaa:

No name servers defined........

this is info displayed........

No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com

shivaa · 03-20-2013, 05:55 AM

File should look like this, where 2 DNS servers are defined as primary and secondary:

Code:

domain mars.universe.com
nameserver x.x.x.x
nameserver x.x.x.x
search mars.universe.com universe.com

So define them first or ask your network admin to provide you the same.