Install-Ansible-Basic-Commands.md

LAB: Install Ansible and Test Basic Ansible (Ad-Hoc) Commands

This scenario shows:

• how to install ansible
• how to use basic commands

Prerequisite

• You should have a look following lab, nodes that are created in that LAB, are using in ansible commands
  • LAB: Multipass-SSH Configuration (Create Ansible Test Environment)

Steps

• Install Ansible on all nodes

sudo apt install ansible

• Create directory and inventory file to put managed nodes' IPs

• Put the managed nodes' IPs into the inventory file

• Ping all nodes with ansible

ansible all -i inventory -m ping

NOTE: If you use secure private SSH keys on each nodes (copied these keys on each nodes), it should be used "ansible all --key-file ~/.ssh -i inventory -m ping"

• Create config file (ansible.cfg)

touch ansible.cfg
# copy followings:
[defaults]
inventory = inventory
# private_key_file = ~/.ssh/ansible

• Using config file (ansible.cfg), we can use short commands

• List all hosts

ansible all --list-hosts

• Gather all nodes' information (all resources' information: cpu, ip, ssd, etc.) from all hosts

# -m parameter means ansible module
ansible all -m gather_facts

• Gather information from specific node

ansible all -m gather_facts --limit 172.26.215.23

• Run "sudo apt update" for all nodes using ansible
• As it is seen in the printscreen, it does not work.

ansible all -m apt -a update_cache=true

• The reason why "sudo apt update" does not work is to enter "sudo" password for all nodes.
• For now, we are assigning same password for all nodes (node1, node2). Later, it will be shown for different passwords.

sudo passwd ubuntu

• Run "sudo apt update" for all nodes using "BECOME PASS", enter the common password when it asks

ansible all -m apt -a update_cache=true --become --ask-become-pass

• Install specific package "sudo apt get snapd"

ansible all -m apt -a name=snapd --become --ask-become-pass
# latest version
ansible all -m apt -a "name=snapd state=latest" --become --ask-become-pass