DevOps Classroomnotes 09/Jan/2023

Ansible Contd…

Ansible loops and variables in inventory

• we are supposed to install the following softwares into a node
  • git
  • tree
  • nano
  • net-tools
• Adding lists to ini inventory formats and executing playbook
• inventory

[local]
localhost packages='["git", "nano", "tree", "net-tools"]'

• playbook

---
- name: install utilities
  hosts: all
  tasks:
    - name: install utilities
      ansible.builtin.package:
        name: "{{ item }}"
        state: present
      become: yes
      loop: "{{ packages }}"

• lets try writing the inventory in yaml. Refer Here for the changes
  
• inventory in ini file

[appservers]
20.121.55.193 java_package_name=java-11-openjdk-devel
172.31.24.180 java_package_name=openjdk-11-jdk

[appservers:vars]
user_name=tomcat
group_name=tomcat
user_home=/opt/tomcat
user_shell=/bin/false
tomcat_version="10.1.4"
tomcat_major_version="10"
tomcat_service_name=tomcat.service

• same inventory in yaml file

---
all:
  children:
    appservers:
      hosts:
        20.121.55.193:
          java_package_name: java-11-openjdk-devel
        172.31.24.180:
          java_package_name: openjdk-11-jdk
      vars:
        user_name: tomcat
        group_name: tomcat
        user_home: /opt/tomcat
        user_shell: /bin/false
        tomcat_version: "10.1.4"
        tomcat_major_version: "10"
        tomcat_service_name: tomcat.service

• It is not a good idea to define variables in inventory, variables should be treated seperately. Optimizing inventory Refer Here and Refer Here for organizing group and host variables.
• Refer Here for the changes done and screen shot below for output
  

Ansible Special Variables

• ansible while executing has lot of special variables defined by ansible Refer Here
  
• after fixing packages Refer Here