DevOps Classroom notes 27/Jan/2026

Configuration Management.

• Configuration Management refers to deploying configurations to remote systems.
• Configurations are declarative in nature. (What has to be done over how it has to be done)
• Examples:
  • Ansible
  • Chef
  • Puppet
  • Salt
  • Powershell DSC
• CM can be
  • PULL BASED:
    • chef
    • puppet
  • PUSH BASED
    • Ansible
• PUSH BASED CM Need
  • inventory
  • managing credentials to connect to nodes
    
• PULL BASED CM Need
  • Agents
    

HOW SSH WORKS in plain English

• Linux Machines support two types of credentials
  • username and password
  • username and key based
    
• Prompt for password auth

You are expert in Linux and Authentications
I'm learning ssh and linux
Explain ssh authentication password based in plain english in step by step approach

• Prompt for key based auth

You are expert in Linux and Authentications
I'm learning ssh and linux
Explain ssh authentication key based in plain english in step by step approach Also explain what keys.

• When we use ssh a file called known_hosts is created findout the contents and purpose of this document