Puppet users - Oct 2012 - Over riding global settings/class/variables at node level

Hello,

I am new to puppet programming. I have encountered a problem where the a 
global setting, application to all servers, nodes across the board to 
enable a particular service such as rsyslog. And I want to have a server 
that should not run rsyslog rather it should run syslog-ng. 

So basically I am having two classes in the same node, one is saying start 
rsyslog and another (my class) is saying to stop rsyslog and start 
syslog-ng. Whenever I run this it shows duplication definition error.

So one class is doing

service {''rsyslog'': enable => true}

another class

service {''rsyslog'': ensure => stopped}

err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Duplicate definition: Service[rsyslog] is already defined in file 
/etc/puppet/environments/syslog/manifests/classes/enabled-c6.pp at line 8; 
cannot redefine at 
/etc/puppet/environments/syslog/modules/syslog_ng/manifests/service.pp:5 on 
node test-logserver

Thanks

Chandan




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Rules are not run in order, so there''s nothing to indicate to Puppet
which of those contradictory rules should win. Puppet also enforces a
uniqueness on the pair (type, name) -- (''service'',
''rsyslog'') is
unique and you cannot have another one.

What you''ll need to do is make sure that only one of those rules
applies to any one host.

Good luck!
Aaron


On Fri, Oct 26, 2012 at 7:21 PM, chandan kumar <chandank.kumar@gmail.com>
wrote:
> Hello,
>
> I am new to puppet programming. I have encountered a problem where the a
> global setting, application to all servers, nodes across the board to
enable
> a particular service such as rsyslog. And I want to have a server that
> should not run rsyslog rather it should run syslog-ng.
>
> So basically I am having two classes in the same node, one is saying start
> rsyslog and another (my class) is saying to stop rsyslog and start
> syslog-ng. Whenever I run this it shows duplication definition error.
>
> So one class is doing
>
> service {''rsyslog'': enable => true}
>
> another class
>
> service {''rsyslog'': ensure => stopped}
>
> err: Could not retrieve catalog from remote server: Error 400 on SERVER:
> Duplicate definition: Service[rsyslog] is already defined in file
> /etc/puppet/environments/syslog/manifests/classes/enabled-c6.pp at line 8;
> cannot redefine at
> /etc/puppet/environments/syslog/modules/syslog_ng/manifests/service.pp:5 on
> node test-logserver
>
> Thanks
>
> Chandan
>
>
>
>
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On 10/26/2012 7:21 PM, chandan kumar wrote:
> Hello,
>
> I am new to puppet programming. I have encountered a problem where the a
> global setting, application to all servers, nodes across the board to
> enable a particular service such as rsyslog. And I want to have a server
> that should not run rsyslog rather it should run syslog-ng.
>
> So basically I am having two classes in the same node, one is saying
> start rsyslog and another (my class) is saying to stop rsyslog and start
> syslog-ng. Whenever I run this it shows duplication definition error.
>
> So one class is doing
>
> service {''rsyslog'': enable => true}
>
> another class
>
> service {''rsyslog'': ensure => stopped}
>
> err: Could not retrieve catalog from remote server: Error 400 on SERVER:
> Duplicate definition: Service[rsyslog] is already defined in file
> /etc/puppet/environments/syslog/manifests/classes/enabled-c6.pp at line
> 8; cannot redefine at
> /etc/puppet/environments/syslog/modules/syslog_ng/manifests/service.pp:5
> on node test-logserver
One solution is to create the following class.

modules/rsyslog/manifests/service/disable.pp
class rsyslog::service::disable inherits rsyslog::service {
   Service[''rsyslog''] { ensure => stopped, enable =>
false, }
}

assuming you have something like this
node basenode {
   include rsyslog
}

Then you''d add the addition class to override the original
functionality.
node ''someserver'' inherits basenode {
   include syslog_ng
   include rsyslog::service::disable
}

Or if syslog_ng and rsyslog can never coexist, I''d include the disable 
class directly in the init.pp of your syslog_ng class.

Ramin

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Thanks for the response. I am able to fix the problem 

class syslog_ng::service inherits standard-services {

  Service[''rsyslog''] {
    enable => false,
    ensure => stopped,
  }

  service { ''syslog-ng'':
    ensure  => running,
    enable  => true,
    require => Class[''syslog_ng::install'']
  }

}

On Saturday, 27 October 2012 12:33:14 UTC-7, Ramin K
wrote:
>
> On 10/26/2012 7:21 PM, chandan kumar wrote: 
> > Hello, 
> > 
> > I am new to puppet programming. I have encountered a problem where the
a
> > global setting, application to all servers, nodes across the board to 
> > enable a particular service such as rsyslog. And I want to have a
server
> > that should not run rsyslog rather it should run syslog-ng. 
> > 
> > So basically I am having two classes in the same node, one is saying 
> > start rsyslog and another (my class) is saying to stop rsyslog and
start
> > syslog-ng. Whenever I run this it shows duplication definition error. 
> > 
> > So one class is doing 
> > 
> > service {''rsyslog'': enable => true} 
> > 
> > another class 
> > 
> > service {''rsyslog'': ensure => stopped} 
> > 
> > err: Could not retrieve catalog from remote server: Error 400 on
SERVER:
> > Duplicate definition: Service[rsyslog] is already defined in file 
> > /etc/puppet/environments/syslog/manifests/classes/enabled-c6.pp at
line
> > 8; cannot redefine at 
> >
/etc/puppet/environments/syslog/modules/syslog_ng/manifests/service.pp:5
> > on node test-logserver 
>
> One solution is to create the following class. 
>
> modules/rsyslog/manifests/service/disable.pp 
> class rsyslog::service::disable inherits rsyslog::service { 
>    Service[''rsyslog''] { ensure => stopped, enable
=> false, }
> } 
>
> assuming you have something like this 
> node basenode { 
>    include rsyslog 
> } 
>
> Then you''d add the addition class to override the original
functionality.
> node ''someserver'' inherits basenode { 
>    include syslog_ng 
>    include rsyslog::service::disable 
> } 
>
> Or if syslog_ng and rsyslog can never coexist, I''d include the
disable
> class directly in the init.pp of your syslog_ng class. 
>
> Ramin 
>
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