DevOps Classroom Series – 26/Dec/2020

Exercise: Now try Writing an ansible playbook for install tomcat8 on ubuntu and centos
- ubuntu Refer Here
- centos Refer Here
Solution:
We have configured 3 ansible nodes
- 2 centos server with python 2.7
- 1 ubuntu server with python 3.7
All the machines have a user ‘ansible’ configured for password less authentication
So first lets verify inventory Refer Here
We have ran ansible ping adhoc command
ansible has predefined inventory parameters which can change ansible behavior for a node or group of nodes
- ansible_host: This is DNS name
- ansible_port: port for ssh (default will be 22)
- ansible_user: Specifies the username that ansible will connect to node with
- ansible_ssh_private_key_file: SSH private key file used to connect to node
- ansible_python_interpreter: used to set manual path of python on node
- ansible_become
- ansible_become_method
- ansible_sudo_pass
- ansible_become_password
- ansible_connection
- ansible_shell_type
- ansible_shell_executable
- ansible_ssh_pass
Refer Here
To find some details about nodes we can use the setup module Refer Here
We can combine facts with ansible conditionals for conditional execution Refer Here
Refer Here for the changeset
Now lets try to create a user as mentioned below

sudo useradd -m -U -d /opt/tomcat -s /bin/false tomcat

Refer Here for the changeset
Refer Here for the draft playbook with 3 steps of ubuntu automated
Refer Here for the draft playbook with 3 steps for centos automated
Exercise:
- Correct the failures in playbook execution
- Try creating only one playbook which does this 3 steps automation in centos and ubuntu
- Observe the behavior of your playbook when it is executed multiple times