Ansible playground

This excercise will show you how to use Ansible to install fully functional Wordpress.

Prerequisities

In order to successfully run the Ansible excercise, you have to install:

Vagrant

After installation, you need to create two Vagrant machines, using this Vagrantfile

To provision the machines, execute vagrant up in the directory where Vagrant file is. To check the status, use vagrant status. To connect to one of the machines, use vagrant ssh <machine_name>. And finally, to destroy both boxes, run vagrant destroy -f.

Connect two Vagrant boxes using ssh key

Execute this sequence on ansiblehost

ssh-keygen -t ed25519
cat .ssh/id_ed25519.pub (or the name generated)

Copy the key.

From the host machine login to ansiblenode vagrant ssh ansiblenode, and execute

echo "<insert your public key here" >> .ssh/authorized_keys

Come back to ansiblehost. Add ssh key to ssh-agent.

eval $(ssh-agent)
ssh-add .ssh/<keyname>

Now you should be able to login to ansiblenode. IP of the box is in the Vagrantfile.

ssh vagrant@10.100.198.189

You successfuly established connection from host to node.

Prepare ansible environment on `ansiblenode`

Install required packages by executing sudo apt update && sudo apt install -y python3.8 python3-pip virtualenv

Update version of Python in the system sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 1

In /datanode directory you have two files. Copy both of them to you home directory.

Execute

chmod 755 envprep.sh
./envprep.sh

Execute the virtualenv

run . ansible/bin/activate. Prompt should indicate that you have active virtualenv (for example (ansible) vagrant@ansiblehost:)

Test Ansible

Navigate to /datanode/ansible directory. Prepare vault file, even if will not be used now.

echo testpassword > vault_file

Execute ansible --version to confirm installation.

Now it is time to test if ansible is able to connect to ansiblenode. Simply execute this ad-hoc command:

ansible vagrant_boxes -i inventory -a "hostname"

You should receive:

10.100.198.189 | CHANGED | rc=0 >>
ansiblenode

If this is correct, you are ready to run playbooks.

Interesting trick

If you wish to not run virtualenv and ansible configurations, you can put it into provisioning scripts.

Run playbook

Execute the playbook against inventory file. To what hosts - it is defined in first lines of provision.yml.

ansible-playbook -i inventory provision.yml

Credits

Ansible playbook is copied from here. If time allows, I'll update it to newest version. Someday ;)

pawelpiwosz/ansible-presentation