Open Source For You — December 2017

How To Admin

http://www.OpenSourceForU.com | OPEN SOURCE FOR YOU | DECEMBER 2017 | 39

The Ansible playbook updates the software package

repository by running apt-get update and then proceeds to

install the Apache2 package. The playbook waits for the server

to start and listen on port 80. An execution of the playbook is

shown below:

$ ansible-playbook -i inventory/kvm/inventory playbooks/

configuration/piwigo.yml --tags web -K

SUDO password:

PLAY [Install Apache web server] ******************

TASK [setup] ***********************************

ok: [ubuntu]

TASK [Update the software package repository] *************

changed: [ubuntu]

TASK [Install Apache] ***************************************

changed: [ubuntu] => (item=[u’apache2’])

TASK [wait_for] *********************************************

ok: [ubuntu]

PLAY RECAP **************************************************

ubuntu : ok=4 changed=2

unreachable=0 failed=0

The verbosity in the Ansible output can be achieved by

passing ‘v’ multiple times in the invocation. The more number

of times that ‘v’ is present, the greater is the verbosity level. The

-K option will prompt for the sudo password for the xetex user.

If you now open http://192.168.122.4, you should be able to see

the default Apache2 index.html page as shown in Figure 1.

MySQL

Piwigo requires a MySQL database server for its back-end,

“ubuntu” VM as indicated below:

192.168.122.4 ubuntu

You should be able to issue commands from Ansible to
the guest OS. For example:

$ ansible ubuntu -m ping

ubuntu | SUCCESS => {
“changed”: false,
“ping”: “pong”
}

On the host system, we will create a project directory
structure to store the Ansible playbooks:

ansible/inventory/kvm/
/playbooks/configuration/
/playbooks/admin/

An ‘inventory’ file is created inside the inventory/kvm
folder that contains the following:

ubuntu ansible_host=192.168.122.4 ansible_connection=ssh
ansible_user=xetex ansible_password=pass

Apache
The Apache Web server needs to be installed first on the
Ubuntu guest VM. The Ansible playbook for the same
is as follows:

• name: Install Apache web server
  hosts: ubuntu
  become: yes
  become_method: sudo
  gather_facts: true
  tags: [web]

tasks:

• name: Update the software package repository
  apt:
  update_cache: yes


• name: Install Apache
  package:
  name: “{{ item }}”
  state: latest
  with_items:


• apache2


• wait_for:
  port: 80

Figure 1: Apache2 default index page