Handson1

Hands-On

Environment

1. Login via ssh to the workgroup server naf-school01.desy.de with your assigned account
2. Check if you can login via ssh to you assigned VM as root
3. Check if you can edit a text file on the wgs and the node. We provide vim, emacs, nano

Puppet first steps

1. Use the puppet RAL to examine and configure the VM node solution
   1. Show all managed resources
   2. Show description of the resource service
   3. Show all configured services
   4. Create a testuser
   5. Show resource of the created user
   6. Delete the testuser
   7. HINT:
      • puppet resource --help
      • puppet describe
      • https://docs.puppetlabs.com/references/latest/type.html#user-attribute-ensure
2. Write the first Manifest
   1. Create a puppet manifest which creates two testuser. Filename: handson1create.pp
   2. Create a puppet manifest which removes both testuser. Filename: handson1remove.pp
   3. Concatenate both puppet manifest. Filename: handson1combine.pp
   4. Apply the manifests to your node.
   5. Try to understand why the handson1combine.pp manifest fails?
   6. Hint:
      • https://docs.puppetlabs.com/puppet/latest/reference/lang_resources.html
      • puppet apply --help
3. Write the second Manifest solution
   1. Create a puppet manifest which creates the file /etc/motd with the content Hello World!. Filename: handson1motd.pp
   2. Apply the manifest to your node
   3. Examine what happens if you re-apply the manifest.
   4. Add a line to the file /etc/motd and re-apply the manifest
   5. Hint:
      • https://docs.puppetlabs.com/references/latest/type.html#file
4. Write the third Manifest solution
   1. Write a manifest which writes 10 debug messages in the following order
      • Hello World 1
        Hello World 2
        Hello World 3
        ...
        Hello World 10
   2. Hint:
      • https://docs.puppetlabs.com/references/latest/type.html#notify
      • https://docs.puppetlabs.com/learning/ordering.html#before-and-require
      • Resources with lower case are instantiating, Resources with first letter upper case are reference
5. Write the fourth manifest to configure the sshd daemon solution
   1. Create the folder /root/example
   2. Copy the file /etc/ssh/sshd_config in the folder /root/example
   3. Create a manifest which defines the following resources in the described order
      1. Install package sshd
      2. Copy the file from /root/example to /etc/ssh/sshd_config
      3. Start the sshd daemon
   4. Apply the manifest with "--noop" parameter the /etc/ssh/sshd_config file shouldn't be changed. No line like

      Notice: /Stage[main]/Main/File[foo]/content: current_value {md5}...., should be {md5}.... (noop)
      

   5. Apply the manifest without "--noop" parameter
6. Write the fifth manifest solution
   1. Improve the third manifest. The text Hello World should be in a variable.
   2. Examine the facts of the VM locally with facter
   3. Write a manifest which gives a debug message if the machine is virtual machine and the uptime
   4. Run the manifest on your VM and on naf-school01
   5. Hints:
      • https://docs.puppetlabs.com/puppet/latest/reference/lang_variables.html

      • man facter
        

      • https://docs.puppetlabs.com/puppet/latest/reference/lang_conditional.html
      • https://forge.puppetlabs.com/puppetlabs/stdlib#str2bool
7. Write your first class
   1. Classes are blocks of resources
   2. They divide the definition and the declarations
   3. Classes could could parameterized
   4. Syntax:
      class my_class {
      ... puppet code ...
      }
   5. transform the fourth manifest (the sshd example) to a class.
   6. Apply the manifest. And examine if the manifest is still working
   7. Add the declartion to the end of the manifest. And re-apply the manifest