Puppet users - Feb 2013 - Can we write many classes in a single manifest

Hi all,

Can we write many classes in a single manifest and apply that manifest??
For example i have created  manifest, file1.pp and it includes the 
following:

class one{
              exec{"--"
              command => "  ",
                      cwd => "   ",     
                      }
              } 


class two{
              exec{"--"
              command => "  ",
                      cwd => "   ",     
                      }
              } 

now can i write a manifest like this and apply it?

Can any one pls help me with it?

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Hi There,
You can, however once a class is defined you must then apply it to the node 
using ''include''

Example:

[ Keiran ~]$ cat /tmp/example.pp

class class1 {
        exec { exec1 :
                command => "/bin/touch /tmp/${title}",
            }

    }

class class2 {
        exec { exec2 :
                command => "/bin/touch /tmp/${title}",
            }

    }

include class1
include class2

[ Keiran ~]$ puppet apply /tmp/example.pp
notice: /Stage[main]/Class2/Exec[exec2]/returns: executed successfully
notice: /Stage[main]/Class1/Exec[exec1]/returns: executed successfully
notice: Finished catalog run in 0.17 seconds
[ Keiran ~]$ ls -al /tmp/ |grep -i class
-rw-r--r--  1 Keiran Keiran     0 Feb 18 10:27 class1
-rw-r--r--  1 Keiran Keiran     0 Feb 18 10:27 class2
[ Keiran ~]$


Defining multiple classes in a single manifest for non-testing/learning may 
not always be deemed as best practice, It might be worth having a read of 
the following documentation:
- http://docs.puppetlabs.com/puppet/2.7/reference/lang_classes.html
- http://docs.puppetlabs.com/guides/style_guide.html

Hope this helps,

K





On Monday, February 18, 2013 7:07:39 AM UTC, yarlagadda ramya
wrote:
>
> Hi all,
>
> Can we write many classes in a single manifest and apply that manifest??
> For example i have created  manifest, file1.pp and it includes the 
> following:
>
> class one{
>               exec{"--"
>               command => "  ",
>                       cwd => "   ",     
>                       }
>               } 
>
>
> class two{
>               exec{"--"
>               command => "  ",
>                       cwd => "   ",     
>                       }
>               } 
>
> now can i write a manifest like this and apply it?
>
> Can any one pls help me with it?
>
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On Monday, February 18, 2013 1:07:39 AM UTC-6, yarlagadda ramya
wrote:
>
> Hi all,
>
> Can we write many classes in a single manifest and apply that manifest??
>

Yes and no.  You can write many classes in the same manifest file, but you 
cannot leverage their colocation in the same file to assign all of them to 
the same node at once.

 
> For example i have created  manifest, file1.pp and it includes the 
> following:
>
> class one{
>               exec{"--"
>               command => "  ",
>                       cwd => "   ",     
>                       }
>               } 
>
>
> class two{
>               exec{"--"
>               command => "  ",
>                       cwd => "   ",     
>                       }
>               } 
>
> now can i write a manifest like this and apply it?
>
> Can any one pls help me with it?
>

You should put all your classes in modules, and lay them out in the way the 
autoloader expects.  Example:

modules/mymodule/manifests/one.pp:
------
class mymodule::one {
  # resources ...
}


modules/mymodule/manifests/two.pp:
------
class mymodule::two {
  # resources ...
}

Note the correspondences between module name ("mymodule") and
directory,
and between class names and file names.  Those are significant.


If you want a simple, reusable way to apply both of those together to the 
same node, then create a class for it.  If the two (or more) belong to the 
same module, then you might be looking for a module main class:

modules/mymodule/manifests/init.pp:
------
class mymodule {
  include ''mymodule::one''
  include ''mymodule::two''
}


Note that that one is special: the fully-qualified name of the class is the 
same as the name of the module, and it (for that reason) is recorded in a 
file named ''init.pp'' in the module''s manifests
directory.

To apply both to node "mynode", just assign class
''mymodule'' to that node:

node ''mynode'' {
  include ''mymodule''
}


John

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