Building Automated CI/CD Pipelines with GitHub Actions & Docker

Modern cloud infrastructure demands fast, repeatable, and secure deployment workflows. In this article, we break down how to set up an end-to-end continuous integration and continuous deployment (CI/CD) pipeline for containerized microservices.

Core Principles of Container Orchestration

1. Immutable Builds: Packaged Docker images serve as single sources of truth.
2. Environment Parity: Staging and production share identical environment setups.
3. Automated Verification: Linting, security scanning, and unit tests execute on pull requests.

name: Production Deployment
on:
  push:
    branches: [ main ]
jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Build Docker Image
        run: docker build -t app:latest .

Zero-Downtime Rollouts with Nginx Reverse Proxy

By deploying containers alongside Nginx reverse proxying and automated Let's Encrypt SSL, deployments transition seamlessly without dropped user connections.