Jenkins Continuous Integration Overview

Continuous integration is a process in which all the development activities (everyday activities) are integrated at a given point of time by compiling and building the project and well tested. The basic idea behind the continuous integration is to ensure that there are no compilation issues at the end of the day by numerous check-ins made by the developers in a team. Also, this would enable to identify any compilation issues at the early stages of the development process.

In this process, all the developer's activities are collaborated and merged at the central system (repository at which all the check-ins are made). The main aim again here in this process is to eliminate the "integration problems". Each and every integration is automatically built, deployed and tested thoroughly.

Continuous Integration was first introduced in the year 2000 with the software known as Cruise Control. Over the years, Continuous Integration has become a key practice in any software organization. This is a development practice that calls upon development teams to ensure that a build and subsequent testing is conducted for every code change made to a software program. This concept was meant to remove the problem of finding late occurrences of issues in the build lifecycle. Instead of the developers working in isolation and not integrating enough, Continuous Integration was introduced to ensure that the code changes and builds were never done in isolation.

Best Practices of CI

  • Keep Your Pipelines Fast
  • Isolate and Secure Your CI/CD Environment
  • Make the CI/CD Pipeline the Only Way to Deploy to Production
  • Maintain Parity with Production Wherever Possible
  • Build Only Once and Promote the Result Through the Pipeline
  • Run Your Fastest Tests Early
  • Minimize Branching in Your Version Control System
  • Run Tests Locally Before Committing to the CI/CD Pipeline
  • Run Tests in Ephemeral Environments When Possible

Advantages of CI

  • Fast feedback loops.
  • Increase transparency and visibility.
  • Avoid “integration hell”.
  • Detect and fix issues early.
  • Improve quality and testability.