Lab 4 - Solution
""""""""""""""""

Mandatory
=========

Create a YAML List
------------------
* create an empty file and save it as ``lab4.yml``

.. code-block:: bash

    touch lab4.yml
    vi lab4.yml

* edit the file and define a YAML list named ``ntp_servers`` and add this items:

    * 0.ch.pool.ntp.org
    * 1.ch.pool.ntp.org
    * 2.ch.pool.ntp.org
    * 3.ch.pool.ntp.org

.. code-block:: yaml

    # file: lab4.yml
    ---
    ntp_servers:
      - 0.ch.pool.ntp.org
      - 1.ch.pool.ntp.org
      - 2.ch.pool.ntp.org
      - 3.ch.pool.ntp.org


Create a YAML dictionary
------------------------
* add a dictionary named ``ntp_settings`` with these key/values

    * driftfile -> ``/var/lib/ntp/ntp.drift``
    * restrict -> ``127.0.0.1``
    * statistics -> ``loopstats peerstats clockstats``

.. code-block:: yaml

    # file: lab4.yml
    # a dictionary
    ntp_settings:
      driftfile: /var/lib/ntp/ntp.drift
      restrict: 127.0.0.1
      statistics: loopstats peerstats clockstats


Run some ad-hoc tasks
---------------------
* Install ``telnet`` via ``yum`` module on ``web2.<firstname>.lab``
* Run the installation again
* Remove the package ``telnet`` via ``yum`` module on ``web2.<firstname>.lab``
* Run the deinstallation again

.. code-block:: bash

    # install 1 - changed
    ansible -m yum -a "name=telnet state=latest" web2.pascal.lab

    # install 2 - ok
    ansible -m yum -a "name=telnet state=latest" web2.pascal.lab

    # deinstall 1 - changed
    ansible -m yum -a "name=telnet state=absent" web2.pascal.lab

    # install 2 - ok
    ansible -m yum -a "name=telnet state=absent" web2.pascal.lab


Install tree
------------
* Install ``tree`` via ``apt`` module on ``web1.<firstname>.lab``

.. code-block:: bash

    # install 1 - changed
    ansible -m apt -a "name=tree state=latest" web1.pascal.lab


Create your first YAML task
---------------------------
* Create a task in YAML style for a ``ntp`` installation via ``apt``. Save the tasks also in the file ``lab4.yml``

    * ``state`` -> latest

.. code-block:: yaml

    # file: lab4.yml
    - name: install ntp package
      apt:                          
        name: ntp                 
        state: latest


Optional
========

Expand your dictionary
----------------------
* Replace the string ``restrict`` with a list and add these items:

   * 127.0.0.1
   * ::1

.. code-block:: yaml

    # a dictionary
    ntpsettings:
      driftfile: /var/lib/ntp/ntp.drift
      restrict:
        - 127.0.0.1
        - ::1
      statistics: loopstats peerstats clockstats


Install a specific version of a package
---------------------------------------
* Install ``httpd`` version ``2.4.6-88.el7.centos`` via ``yum`` module on ``web2.<firstname>.lab``

.. code-block:: bash

    ansible -m yum -a "name=httpd-2.4.6-88.el7.centos state=present" web2.pascal.lab