action-docker

This repository demonstrates automated Docker image building and publishing to Docker Hub using GitHub Actions.

Overview

The project contains multiple containerized services related to Kubernetes authentication and authorization, with automated CI/CD pipelines that build and push Docker images on every push to the main branch.

What This Project Does

GitHub Actions Automation

A GitHub Actions workflow (.github/workflows/docker-image.yml) automatically:

1. Triggers on code push to the main branch
2. Sets up Docker Buildx for multi-platform builds
3. Authenticates with Docker Hub using encrypted credentials
4. Caches Docker layers to optimize build times
5. Builds and pushes 4 Docker images to Docker Hub:
   • dind - Docker-in-Docker environment with additional commands
   • authn-webhook - Kubernetes authentication webhook service
   • authz-webhook - Kubernetes authorization webhook service
   • directpv-discover - DirectPV discovery tool

Project Components

• authn-webhook: A simple HTTP server implementing Kubernetes token-based authentication webhook for the kube-apiserver
• authz-webhook: A simple HTTP server implementing Kubernetes authorization webhook for the kube-apiserver
• dind: Docker-in-Docker container with extended functionality
• kubectl-directpv: DirectPV discovery service for Kubernetes persistent volumes

How It Works

When you push to main:

1. GitHub Actions automatically triggers the workflow
2. Docker images are built using the Dockerfile in each service directory
3. Images are tagged with version information
4. All images are pushed to Docker Hub at victorbecerra/[service-name]
5. Build layers are cached to speed up subsequent builds

Learning Context

These components are based on exercises from "Programming with Kubernetes" (educative.io) and demonstrate webhook implementations for Kubernetes API server authentication and authorization flows.