Continuous Integration, Delivery, and Deployment of Microservices: A Hands-on Guide

In a microservice architecture, multiple services collaborate to provide a final super-application or system that meets specific business needs. The system achieves its goals through the cooperation of its services. If a service isn't functioning correctly, the entire system may be impacted.

Therefore, it's crucial to implement the shift-left approach and best practices in the development lifecycle of each microservice. One of the most important practices is to have a CI/CD pipeline for each service. Each service is built and tested independently with new changes, and then integrated and tested within the entire system before deployment.

To simplify the CI/CD process, we can break it down into several stages:

• Before committing new code, developers should run unit tests and static code analysis tools locally to catch issues early. These tests can also be run in a CI/CD pipeline after the code is pushed to the repository, but running them locally first saves time and resources.

• After tests are passed, the service should be versioned and packaged (for example, as a Docker image).