DevOps Classroom Series – 15/Dec/2020

Story of Learning Thoughts – Application Deployments

• Learning Thoughts (a ficticious organization) is working on different projects in the following domains
  • Health Care
    • iCare:
      • developed in Java and is to be deployed on Linux based Systems
      • Database: Postgres
    • radCare:
      • developed in .net and is to be deployed on Windows Servers
      • SQL Server Database
  • Fintech
    • personal-fin:
      • Java backend
      • Andrioid Frontends
      • ios Frontends
      • Mongodb
    • Stock-watch:
      • Python backend
      • Andriod
      • IOS
      • Angualar
      • Database: Oracle
  • eCommerce
    • lt-commerce:
      • Developed in python Django
      • Database is mysql
  • CRM (Customer Relationship Management)
    • lt-crm
      • Developed in python flask
      • Andriod
      • ios
      • Database is mysql and Mongodb
  • HRMS (Human Resource Management Systems)
    • Lt-HRMS
      • Developed in PHP
      • Deployed in Linux on Apache Servers
      • Database is mysql
• Learning Thoughts Deployment Process
  • Each application will have following environments (6)
    • Developer Environment
    • Testing
      • System Testing
      • Functionality Testing
      • Performance Testing
      • UAT (User Acceptance Testing/Pre-Production)
    • Production
  • Release-Frequency
    • Every day the changes made by developers in the code needs to be deployed to Developer Environment, Functionality Testing and System Testing
    • Performance Testing Environment & UAT Env will be updated once in a week
    • Production env will be updated once in two weeks
• Lets get the team introduced
  • Mike: Expert in linux and shell scripting
  • Mitch: Expert in Windows, Powershell and SQL Server
  • Mark: Expert in Databases
  • Stacy: The manager
• Are these 3 people enough for creating/maintaining six environments per project?
  • No, We have a junior team who help in creating/maintaining six environemts
• Can we manually deploy applications with this team?
  • No, we need some kind of automation.
• We have experts (Mike, Mitch, Mark) who can create complex scripts to deploy applications. Can we use that?
  • No, bcoz junior team has work on executing and fixing scripts, Complex scripts can be difficult to manage.
• Would it be better if the scripts have
  • how the application has to be deployed?
  • what has to deployed?
• It would be easier if the script written describes what has to be done?
• Lets call what has to be done as desired state
• So we need a way to describe a desired state and when we run the script it should ensure desired state is maintained
• To maintain a desired state we need tools which are intelligent, scripts (shell/powershell) will not be enough
• Exactly this is where Configuration Management (CM) comes into play. In CM we would have a tool intelligent to maintain desired state.
• Lets see how the CM tools work

Exercise

• To Get Some idea about devops watch 1-7 videos Refer Here