Puppet users - Aug 2009 - Running puppet on manifest modificattion

Hi All,

I am new to Puppet and recently switched from Cfengine.  I used it to
make to propagate a configuration file. The manifest involved wgetting
a file and restarting the concerned daemon. As a result of this within
a couple of hours I got flooded with alerts because the daemon kept
restarting.

I am aware that by default puppet runs the manifest every 30mins and
that value is adjustable but I want it to run only when the manifest
has changed, like in cfengine.

Sameer

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Is there any reason for specifically using wget and not the file 
resource. You usually use the service and file resources for what you 
do... Something like this example here for nginx 
http://github.com/lak/puppet-nginx/tree/master (look in both init.pp and 
config.pp). Stripping down should look like:

class nginx {
package { nginx: ensure => installed }

    service { nginx:
        ensure => running,
        enable => true
    }


   file { "/etc/nginx/nginx.conf":
        content => template("nginx/nginx.conf.erb"),
        mode => 644,
        owner => root,
        notify => Service[nginx]
    }
}

Also do some requires for the package (ie make sure the package is 
installed before copying the file or checking if the service is running)

Silviu

sameer wrote:
> Hi All,
>
> I am new to Puppet and recently switched from Cfengine.  I used it to
> make to propagate a configuration file. The manifest involved wgetting
> a file and restarting the concerned daemon. As a result of this within
> a couple of hours I got flooded with alerts because the daemon kept
> restarting.
>
> I am aware that by default puppet runs the manifest every 30mins and
> that value is adjustable but I want it to run only when the manifest
> has changed, like in cfengine.
>
> Sameer
>
> >
>   

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On Monday 24 August 2009 11:35:01 sameer wrote:
> Hi All,
>
> I am new to Puppet and recently switched from Cfengine.  I used it to
> make to propagate a configuration file. The manifest involved wgetting
> a file and restarting the concerned daemon. As a result of this within
> a couple of hours I got flooded with alerts because the daemon kept
> restarting.
That depends on how are you doing this in puppet.  If you''re using
''wget'' in
exec resource then indeed that''s what will happen (see below).  The
proper
way would be to use file and service resources:

file { ''/etc/daemon_config_file'':
    ensure => present,
    # ... owner, group, mode, etc.
    source => ''puppet:///.../daemon_config_file'',
    notify => Service[''daemon''],
}
service { ''daemon'': ensure => running }

The ''notify'' metaparam will cause the service to be restarted
only if file has
changed.
>
> I am aware that by default puppet runs the manifest every 30mins and
> that value is adjustable but I want it to run only when the manifest
> has changed, like in cfengine.
While puppet indeed runs every 30 mins by default, it only applies changes if 
there''s actually something to apply.  Which means the configuration has
to be
idempotent so puppet can tell if a change has to be applied or not.  Most 
resources handle that by default, in case of exec resources you have to do it 
by hand, e.g. by specifying one of ''onlyif'',
''unless'', ''creates'', etc.
metaparams.  Have a look at type reference here: 
http://reductivelabs.com/trac/puppet/wiki/TypeReference
>
> Sameer
>
> 

-- 
Michael Gliwinski
Henderson Group Information Services
9-11 Hightown Avenue, Newtownabby, BT36 4RT
Phone: 028 9034 3319

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