DevOps Classroomnotes 27/Dec/2022

Need for Ansible

• Problem Statement:
  • Organization QA Policy:
    • For every change submitted by developer run
      • unit tests
      • functional tests
      • Performacne tests
  • For FT and PT we need application to be up and running
  • Since number of changes occuring in code will be more we need to do more deployments and doing this manually is not sensible (increases time to market.)
• To Solve this number of deployments we have to automate. To automate we have two ways
  • Procedural
  • Declarative
    
• Configuration Management can be acheived by many tools. Some of them are
  • Puppet
  • Chef
  • Ansible
  • Salt
  • Powershell DSC

Architecture of Configuration Management (CM)

• Components of Configuration Management Architecture
  • CM Server:
    • This has necessary tools to automate the deployment
    • This server understands the desired state.
  • Nodes:
    • These are the servers on which your applications run
    • This is where we are supposed to deploy the application
• Types of CM
  • Pull Based CM:
    • Nodes need to know about server which requires agent to be installed on the nodes.
    • Examples:
      • Chef
      • Puppet
  • Push Based CM
    • CM Server should be aware of the nodes
    • Server logs in to the node and executes the work
      • credentials and permissions are required.
    • Examples
      • Ansible
      • Salt
        
        
• Ansible Specifics
  
• Ansible is an open source software developed in python.
• Ansible expects python to be installed on nodes.