Ansible Variables.YAML

Ansible Variables
-------------------

We are now going to talk about look at variables in Ansible.

So what are variables, just like any other scripting or programming, language variables are used to store values that varies with different items.
For example, let's say we are trying to perform the same operation of applying patches to 
hundreds of servers.

We only need a single playbook for all 100 servers. However, it's the variables that store information about the different host names, usernames or passwords
that are different for each server.

We can define as many variables as required like this. We could also define variables inside the playbook.
To add a variable, we could simply add a "Vars" directive, followed by variables in a key value pair format.

We can also have variables defined in a separate file dedicated for variables. We will learn about this more later when we talk about includes enrols.



- hosts: all
  vars:
    region:
      - ap-south-1
      - us-east-1

      
  tasks:
  - name: Ansible List variable Example
    debug:
      msg: "{{ region [1] }}"


vars:
    region: [ap-south-1, us-east-1]




https://medium.com/nerd-for-tech/installing-jenkins-using-an-ansible-playbook-2d99303a235f



---
- hosts: target
  become: yes
  remote_user: ec2-user
  become_user: root
  tasks:
  - name: Download Long Term Jenkins release
    get_url:
      url: https://pkg.jenkins.io/redhat-stable/jenkins.repo
      dest: /etc/yum.repos.d/jenkins.repo

  - name: Import jenkins key from url
    ansible.builtin.rpm_key:
      state: present
      key: https://pkg.jenkins.io/redhat-stable/jenkins.io.key

  - name: yum update
    yum:
      name: '*'
      state: latest

  - name: Install java
    yum:
      name: java-11-openjdk-devel
      state: present

  - name: Install jenkins
    yum:
      name: jenkins
      state: latest

  - name: daemon-reload to pick up config changes
    ansible.builtin.systemd:
      daemon_reload: yes

  - name: Start jenkins
    ansible.builtin.systemd:
      name: jenkins
      state: started