DevOps Classroomnotes 03/Oct/2023


  • Refer Here for Ansible official page
  • Ansible is majorly used in DevOps to deploy applications into servers across various environments.
  • Ansible in CI/CD pipeline is called by some engine (Jenkins => Ansible, AzureDevOps => Ansible …)
  • Configuration Management types
    • pull based CM
      • Nodes communicate with CM Server to deploy configuration
      • For this to happen, We need to
        • install agent software on node and configure it to connect to the server.
      • Examples:
        • Chef
        • Puppet
    • push based CM:
      • CM Server communicates with Nodes to deploy configuration
      • For this to happen we need details such as
        • ip address of node
        • credentials
      • Examples:
        • Ansible
        • Salt

Declarative vs Procedural

  • Understanding Declarative vs Procedural
  • In Declarative programming, we define what we want (desired state).
  • The job of the tool is to ensure desired state is met every time during execution.
  • Idempotance: The result of execution of CM Script is same when we execute it once or multiple times
  • Configuration Drift: Difference between desired state and actual state.

Ansible Architecture

  • Overview
  • Components

    • Ansible control node: This is where ansible is installed
    • Nodes: This is where we want o perform deployments
    • Inventory: list of nodes and their information
    • Playbook: What has to be done on the node
  • Workflow

    • We develop playook and specify inventory and execute the playbook on ansible control node
    • Now ansible tries to establish connection to node
    • Now the ansible playbook is executed with the help of python on node.

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