Hello Puppet Module

I am writing this post as part of a course called Linuxin keskitetty hallinta (Linux centralized management) held by Tero Karvinen http://terokarvinen.com/2013/aikataulu-%E2%80%93-linuxin-keskitetty-hallinta-%E2%80%93-ict4tn011-4-syksylla-2013

I am using 64-bit Xubuntu 13.10 (Saucy Salamander) Fresh install. Everything on this post is done locally on one computer and not over a network to multiple computers.

The tasks of today’s assignment:

I started by installing puppet:
$ sudo apt-get update && sudo apt-get install puppet

I made a Hello World test with puppet by using the following command:
$ puppet apply -e 'file { "/tmp/helloPuppet": content => "Hello Puppet World!\n" }'

And to read the file:
$ cat /tmp/helloPuppet

Hello Puppet World!

I created new folders under my home directory in order to make a Hello World test to puppet modules
$ mkdir -p puppet/modules/hello/manifests
$ cd puppet
$ nano modules/hello/manifests/init.pp

class hello {
        file { '/tmp/helloModule':
            content => "Hello Puppet Module World!\n"
        }
}

I did the following in order to apply the change:
$ puppet apply --modulepath modules/ -e 'class {"hello":}'

And to see the new file:
$ cat /tmp/helloModule

Hello Puppet Module World!

To test puppet out I edited the new file by adding a second row of text:
$ nano /tmp/helloModule

Hello Puppet Module World!
This change will not stay...

If you want to check the file afterwards:
$ cat /tmp/helloModule

To make puppet check the file again:
$ puppet apply --modulepath modules/ -e 'class {"hello":}'

Notice: /Stage[main]/Hello/File[/tmp/helloModule]/content: content changed '{md5}e5e4f24ae42ca15bfbf879c5044fcc6d' to '{md5}67e403ad5ec5407f691c6e08a65fea52'
Notice: Finished catalog run in 0.08 seconds

And re-check the content:
$ cat /tmp/helloModule

Hello Puppet Module World!

The file is the same as before the edit.

To finish the assignment I created new folders under the puppet directory with the following command:
$ mkdir -p modules/apache2/manifests

I created a new init.pp -file under manifests which contained the following:
nano modules/apache2/manifests/init.pp

class apache2 {

   	package { "apache2":
		ensure => "installed"
	}

	service { "apache2":
        	ensure => "running",
        	enable => "true",
        	require => Package["apache2"],
    	}

	exec { "userdir":
        	notify => Service["apache2"],
        	command => "/usr/sbin/a2enmod userdir",
        	require => Package["apache2"],
    	}
}

Now puppet should check if apache2 is installed and running. It also enables the use of public_html in users’ home directories.

After sudo puppet apply --modulepath modules/ -e 'class {"apache2":}' Puppet installed apache2 and allowed the use of public_html.

Next I navigated to my home directory and created the folder and added a simple html-file.
cd
mkdir public_html
cd public_html
nano index.html

<!doctype html>
<html>
<head>
	<title>Testing Apache2</title>
</head>
<body>
	<p>This is HTML</p>
</body>
</html>

After that I opened firefox and navigated to localhost/~samuel which showed the HTML page I had just created.

Sources I used

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One thought on “Hello Puppet Module

  1. Pingback: Hello Puppet features | Samuel Kontiomaa

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