Puppet users - Apr 2011 - Easy setting vars in /etc/sysconfig

Hi there,

I wonder if there is an easy way to change variables in the standard 
linux config files in /etc/sysconfig/* on RHEL or /etc/defaults/* on Debian.

For instance I would like to set the host name in /etc/sysconfig/network 
with something like:

configoption { "/etc/sysconfig/network":
     option => "HOSTNAME",
     value => "host.example.com",
     ensure => exact,        # or "includes" or "remove"
or "commentout"
}

Is there an easy way to do that? Or should I invent the wheel?

Thanks

GiBo

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On 14/04/11 06:26, Giovanni Bordello wrote:
> I wonder if there is an easy way to change variables in the standard
> linux config files in /etc/sysconfig/* on RHEL or /etc/defaults/* on
> Debian.
> 
> For instance I would like to set the host name in /etc/sysconfig/network
> with something like:
> 
> configoption { "/etc/sysconfig/network":
>     option => "HOSTNAME",
>     value => "host.example.com",
>     ensure => exact,        # or "includes" or
"remove" or "commentout"
> }
> 
> Is there an easy way to do that? Or should I invent the wheel?
Check out the Augeas project and associated Puppet type.  Here''s a RHEL
example, though similar things should work with /etc/default/ on Debian:

augeas { "nisdomain":
  context => "/files/etc/sysconfig/network",
  changes => "set NISDOMAIN example.net",
}

To remove it:

  changes => "rm NISDOMAIN",

Commenting out is tricky though.. perhaps you could use ''mv''
when it
arrives, but that doesn''t completely solve the problem.

Here are a few resources:
  http://projects.puppetlabs.com/projects/1/wiki/Puppet_Augeas
  http://docs.puppetlabs.com/references/latest/type.html#augeas
  http://augeas.net/tour.html
  http://r.pinson.free.fr/augeas/augeas-book.pdf

The best way to learn Augeas and how to modify the tree is to explore
using the augtool command.

There are also a few recipes for changing individual lines in files on
the Puppet wiki:
http://projects.puppetlabs.com/projects/1/wiki/Simple_Text_Patterns

Both solutions could be wrapped up in a define() to give you an
interface similar to the one you want.

-- 
Dominic Cleal
Red Hat Consulting
m: +44 (0)7818 512168

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On 14/04/11 20:04, Dominic Cleal wrote:
> On 14/04/11 06:26, Giovanni Bordello wrote:
>> I wonder if there is an easy way to change variables in the standard
>> linux config files in /etc/sysconfig/* on RHEL or /etc/defaults/* on
>> Debian.
>>
>> For instance I would like to set the host name in
/etc/sysconfig/network
>> with something like:
> Check out the Augeas project and associated Puppet type.
Thanks!

There''s so many things to learn about Puppet & Co, hopefully in the
end
all the hard work will bring some juicy fruits :)

GiBo

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