Puppet users - Sep 2012 - How to set DNS on Ubuntu 12.04 clients?

Hi all =)

Does anyone know of a module that can configure the DNS on Ubuntu 12.04 
clients?

This module works for CentOS and Ubuntu < 12.04

http://forge.puppetlabs.com/saz/resolv_conf

but in Ubuntu 12.04 you can''t just overwrite the /etc/resolv.conf
anymore.
DNS have to be set in /etc/network/interfaces

Does anyone know how to do this in puppet?

Hugs,
Sandra =)

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On 11/09/12 16:00, Sandra Schlichting wrote:
> Hi all =)
> 
> Does anyone know of a module that can configure the DNS on Ubuntu 12.04
> clients?
> 
> This module works for CentOS and Ubuntu < 12.04
> 
> http://forge.puppetlabs.com/saz/resolv_conf
> 
> but in Ubuntu 12.04 you can''t just overwrite the /etc/resolv.conf
> anymore. DNS have to be set in /etc/network/interfaces
Not necessarily. I have not tried this myself yet, but you can put
static DNS settings in /etc/resolvconf/resolv.conf.d/{head,base,tail}.
Afterwards call "service resolvconf restart". See here for details:
http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/

You should be able to adapt the resolv_conf module accordingly, or write
your own.

Andreas

Hi,

On Tue, 2012-09-11 at 17:16 +0200, Andreas Ntaflos
wrote:
> On 11/09/12 16:00, Sandra Schlichting wrote:
> > Hi all =)
> > 
> > Does anyone know of a module that can configure the DNS on Ubuntu
12.04
> > clients?
> > 
> > This module works for CentOS and Ubuntu < 12.04
> > 
> > http://forge.puppetlabs.com/saz/resolv_conf
> > 
> > but in Ubuntu 12.04 you can''t just overwrite the
/etc/resolv.conf
> > anymore. DNS have to be set in /etc/network/interfaces
> 
> Not necessarily. I have not tried this myself yet, but you can put
> static DNS settings in /etc/resolvconf/resolv.conf.d/{head,base,tail}.
> Afterwards call "service resolvconf restart". See here for
details:
> http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/
> 
> You should be able to adapt the resolv_conf module accordingly, or write
> your own.
Surely if you''re statically configuring DNS on a server, you
don''t want
a dynamic DNS configuration daemon running on the same server.

Presumably something like:

package { ''resolvconf'':
	ensure => purged
}

And then get on with your life?

Cheers,
-- 
Stephen Gran
Senior Systems Integrator - guardian.co.uk

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>
> Surely if you''re statically configuring DNS on a server, you
don''t want
> a dynamic DNS configuration daemon running on the same server. 
>
> Presumably something like: 
>
> package { ''resolvconf'': 
>         ensure => purged 
> } 
>
> And then get on with your life? 
>
That is a very attractive solution fore sure!

Should I just ignore that it depends on the "ubuntu-minimal" package?


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>
> That is a very attractive solution fore sure!
>
> Should I just ignore that it depends on the "ubuntu-minimal"
package?
>
ouch.

Since /etc/resolv.conf is a symlink to resolvconf''s resolv.conf, you
can
break the symlink, turn resolv.conf into a normal static file and then use
the puppet module.

I am not 100% confident of this solution, though, since I''m not sure if
resolvconf will recreate the symlink at some point -- I haven''t used
this
solution enough to confirm that.

Thanks,
Joe


-- 
Joe Topjian
Systems Administrator
Cybera Inc.

www.cybera.ca

Big data is coming to Canada. Join the welcome wagon.
*Cyber Summit 2012*
October 1-3, Banff
www.cybera.ca/summit2012

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innovation, for the economic benefit of Alberta, through the use
of cyberinfrastructure.

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Hi,

On Tue, 2012-09-11 at 08:44 -0700, Sandra Schlichting
wrote:
>         Surely if you''re statically configuring DNS on a server,
you
>         don''t want 
>         a dynamic DNS configuration daemon running on the same
>         server. 
>         
>         Presumably something like: 
>         
>         package { ''resolvconf'': 
>                 ensure => purged 
>         } 
>         
>         And then get on with your life? 
> 
> 
> That is a very attractive solution fore sure!
> 
> 
> Should I just ignore that it depends on the "ubuntu-minimal"
package?
It won''t cause any harm (as in, lack of functionality) - the
ubuntu-minimal package only exists to make sure other software is
installed.  If you are uneasy about removing the package, you can also
presumably just make sure the service doesn''t run.

Cheers,
-- 
Stephen Gran
Senior Systems Integrator - guardian.co.uk

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On Sep 11, 2012, at 8:54 AM, Joe Topjian wrote:
> That is a very attractive solution fore sure!
> 
> Should I just ignore that it depends on the "ubuntu-minimal"
package?
> 
> ouch. 
> 
> Since /etc/resolv.conf is a symlink to resolvconf''s resolv.conf,
you can break the symlink, turn resolv.conf into a normal static file and then
use the puppet module.
> 
> I am not 100% confident of this solution, though, since I''m not
sure if resolvconf will recreate the symlink at some point -- I haven''t
used this solution enough to confirm that.
----
if /etc/resolv.conf is a puppet maintained file, even if resolvconf package is
updated, it will be replaced by the puppet asserted file anyway.

Craig

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>
> Not necessarily. I have not tried this myself yet, but you can put 
> static DNS settings in /etc/resolvconf/resolv.conf.d/{head,base,tail}. 
> Afterwards call "service resolvconf restart". See here for
details:
> http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/ 
>
Just tried it, and just treating /etc/resolvconf/resolv.conf.d/base as your 
/etc/resolv.conf works.
 
> You should be able to adapt the resolv_conf module accordingly, or write 
> your own. 
>
That should be interesting. I on it =)

 

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>
> if /etc/resolv.conf is a puppet maintained file, even if resolvconf
> package is updated, it will be replaced by the puppet asserted file anyway.
>
Very true, but I would hate to have two services fighting with each other
in that way.


-- 
Joe Topjian
Systems Administrator
Cybera Inc.

www.cybera.ca

Big data is coming to Canada. Join the welcome wagon.
*Cyber Summit 2012*
October 1-3, Banff
www.cybera.ca/summit2012

Cybera is a not-for-profit organization that works to spur and support
innovation, for the economic benefit of Alberta, through the use
of cyberinfrastructure.

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On Tuesday, September 11, 2012 6:29:32 PM UTC+2, Sandra Schlichting wrote:
> That should be interesting. I on it =)
>
 

As you''ve mentioned my resolv_conf module in your first post,
feel free to send me a pull request on Github, if you''re
extending my module.

HAND,

Saz 

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On Sep 11, 2012, at 10:08 AM, Joe Topjian wrote:
> if /etc/resolv.conf is a puppet maintained file, even if resolvconf package
is updated, it will be replaced by the puppet asserted file anyway.
> 
> Very true, but I would hate to have two services fighting with each other
in that way.
----
well, I upgraded a 10.04 test server to 12.04 and noticed the messaging about
the dynamic nature of /etc/resolv.conf in the Ubuntu server list but it
hasn''t been a problem at all so I have left it alone (with puppet fully
managing /etc/resolv.conf). There''s been no contention so I gather that
if /etc/resolv.conf isn''t a symlink, it isn''t mucked with by
the Ubuntu/Debian packaging.

I am however starting to gear up for testing puppet 3, on a test server and ruby
1.93 clients with puppet 3 and even though the current estimate is another year
of 10.04 for new deploys, I have an eye on this issue but so far, it''s
not been a problem.

Craig

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