FAQ
What I normally do is I create a virtual @package resource which installs
php5 for example within say "apache" class and then I realize the virtual
resource within the same "apache" class.

Please, if you intend to write generic and reusable modules so other people
can use, STOP putting hardcoded dependencies in your modules.

Either write in documentation that it depends on an abstract resource, for
instance a mysql database and make it configurable so you can pass db_name,
db_host, etc to your "apache" class. Or create virtual resources and
realize them within the same class - works great for packages and maybe
other resource types.

On Tuesday, 3 April 2012 19:33:32 UTC+1, Christophe L wrote:

Hello,

We had the following situation where including two classes that were
ensuring the installation of the same package "php5-imagick" and it
was causing an error indicating that two ressources of the same name
are forbidden (sorry, I don't have the exact message error since we
fixed quickly the error).

Since we are newbies in puppet, we would like to understand what this
error meant:
does it mean that all the package resource ensuring the installation
of a package need to have a unique resource name ?
Or maybe have we done something wrong in our usage of puppet ?

Below, the code causing the error and how we fixed it.

Thanks in advance for your feebacks.

Best regards,
Christophe

Code causing the error:

/etc/puppet/modules/apache/manifests/init.pp

class apache::install {
...
package { [ "php5", "php5-cli", "php5-gd", "php5-imagick", "php5-
mysql", "phpmyadmin", "mysql-client" ]:
ensure => installed,
}
...
}

/etc/puppet/modules/cms/manifests/init.pp

class cms::installpackage {
...
package { 'php5-imagick':
name => 'php5-imagick',
ensure => 'installed',
}
...
}

In order to fix the error, we prefixed the resource in
cms::installpackage class with cms_

package { 'cms_php5-imagick':
name => 'php5-imagick',
ensure => 'installed',
}
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