change DNS

QWE123 · 03-06-2018, 02:03 AM

I have a redhat 7 web server .

There is no GUI installed ( for some reason , the GUI is unable to install )

I want to change DNS configuration , as I know it is not work to directly update the file /etc/resolv.conf , therefore , I would like to ask is there any method to update DNS without GUI ?

bathory · 03-06-2018, 02:43 AM

Quote:

Originally Posted by QWE123

I have a redhat 7 server .

There is no GUI installed ( for some reason , the GUI is unable to install )

I want to change DNS configuration , as I know it is not work to directly update the file /etc/resolv.conf , therefore , I would like to ask is there any method to update DNS without GUI ?

Edit /etc/sysconfig/network-scripts/ifcfg-ethX (where X is the number of your ethernet card) and add/change

Code:

DNS1=x.x.x.x
DNS2=y.y.y.y

Mind that your NIC could be named other than ethX, in which case you need to edit the proper /etc/sysconfig/network-scripts/ifcfg-<something> file

Regards

QWE123 · 03-06-2018, 02:49 AM

thanks reply ,

Just would like to know how can I confirm the DNS is properly applied after updated the configuration ( withoth GUI ) , if the settings is updated in /etc/resolv.conf , is that mean the DNS is properly applied ?

tocii. · 03-06-2018, 03:02 AM

You need to restart the service to confirm.

bathory · 03-06-2018, 03:05 AM

Quote:

Originally Posted by QWE123

thanks reply ,

Just would like to know how can I confirm the DNS is properly applied after updated the configuration ( withoth GUI ) , if the settings is updated in /etc/resolv.conf , is that mean the DNS is properly applied ?

Yes, if you see the nameserver(s) you used in ifcfg-ethX in /etc/resolv.conf, it means that the changes are done. Or else you need to restart the network as tocii said.

To test, you can run:

Code:

dig +short www.linuxquestions.org

TB0ne · 03-07-2018, 07:56 AM

Quote:

Originally Posted by QWE123

I have a redhat 7 web server .
There is no GUI installed ( for some reason , the GUI is unable to install )

Most probably, because you haven't PAID FOR RHEL, and as such, don't have access to the repositories. You've been asking about RHEL for years now, and have received the same advice over and over: either pay for RHEL, or use CentOS.

Quote:

I want to change DNS configuration , as I know it is not work to directly update the file /etc/resolv.conf , therefore , I would like to ask is there any method to update DNS without GUI ?

Did you open that file? Because in the ones I have, I have this at the top:

Code:

# Before you change this file manually, consider to define the
# static DNS configuration using the following variables in the
# /etc/sysconfig/network/config file:

...that tells you what to edit. Also, "DNS configuration" is a bit vague. Are you RUNNING DNS on this system, or do you mean you just want to change the nameservers the system points to?