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Old 12-02-2008, 01:03 PM   #1
zeeple
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Registered: Sep 2006
Distribution: Fedora 8, RHEL 5
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How to change nameservers WITHOUT editing resolv.conf???


I am looking for ways to update or change nameservers listed on remote linux machines via the command line.

For years I have attempted to do this with a package called 'netconfig' (these are fedora boxes) but netconfig has a bug that causes the nameservers not to be updated with the supplied info on the first attempt. Usually, and this is especially true when going from DHCP to static, a second netconfig attempt is required to get the nameservers to update.

I'd like to find a more reliable way to do this. Are there any command line tools that take a nameserver as an argument and updates resolv.conf accordingly? something along the lines of 'ifconfig' is what I am looking for, although I know ifconfig cannot be used to change nameservers.

In all the googling I have done the only command line related option that I could find for updating nameservers is to manually edit the resolve.conf file and this is not really an option for my application. I need to be able to issue a command to the system to get the job done.

Does anyone here have any good suggestions?
 
Old 12-02-2008, 01:14 PM   #2
acid_kewpie
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Registered: Jun 2001
Location: UK
Distribution: Gentoo, RHEL, Fedora, Centos
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why would editing resolv.conf not be an option? do you mean the manual part of it? no need for it to be manual, just script it.
Code:
sed s/nameserver.*/nameserver\ 192.168.1.1/g -i /etc/resolv.conf
crude but gets the job done.
 
Old 12-02-2008, 01:27 PM   #3
zeeple
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Distribution: Fedora 8, RHEL 5
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Manually editing config files is not an option because often I do not have command line access to the units (but I CAN issue single one-off commands to them). And when I do have cl access it is not reliable. Thus updating the name servers by issuing a single command is what is needed. As for your scripting option, I am prepared to go that route if I have to but I figured an ultra-basic aspect of networking like nameservers would already have a slew of tools supporting it. Something akin to ifconfig or even a working version of netconfig is what is needed. Is there nothing??
 
Old 12-02-2008, 01:29 PM   #4
acid_kewpie
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well i just gave you a one liner that does it...
 
  


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