DevOps Classroom notes 05/Nov/2024

Ansible

inventories in ansible

• Ansible inventory is collection of nodes and is of two types
  • static inventory: we specify ip’s or names
  • dynamic inventory: we execute the script to get ips or names dynamically
• Static inventory can be specified in two formats Refer Here
  • ini
  • yaml
• ini format
• yaml format

Ansible facts

• Ansible collects the information about the node by executing a module setup Refer Here
• setup module Refer Here

Ansible conditionals

• Refer Here for ansible conditions

Ansible adhoc commands

• We can execute adhoc commands Refer Here

ansible -i hosts -m "<module-name>" -a "<argumets/parameters>" all

• Lets install unzip

ansible.builts.file:
  path: /tmp/1.txt
  state: touch

• Adhoc command

ansible -i hosts -m "file" -a "path=/tmp/1.txt state=touch"

Activity 2: Work with different distributions

• Install apache server on redhat and ubuntu
• manual steps for ubuntu

sudo apt update
sudo apt install apache2 -y

• manual steps for redhat

sudo dnf install httpd -y
sudo systemctl enable httpd
sudo systemctl start httpd

• To install apache on both redhat and ubuntu
  • write two different playbooks Refer Here
• Note:
  • on redhat ssh conf /etc/ssh/sshd_config.d/50-cloud-init.conf
  • service name on redhat sshd
• Refer Here for the changes done.