Container Revolution
Docker transformed how applications are packaged and deployed. Containers provide consistency across development, testing, and production environments.
Docker Fundamentals
Images: Read-only templates defining application and dependencies. Built from Dockerfiles.
Containers: Runtime instances of images. Lightweight, portable, isolated.
Docker Compose: Define multi-container applications in YAML. Simplifies local development.
Kubernetes: Container Orchestration
Kubernetes automates deployment, scaling, and management of containerized applications. Handles networking, storage, and resource allocation.
Core Concepts: Pods (smallest deployable units), Services (networking), Deployments (scalable replicas), ConfigMaps (configuration).
DevOps Pipeline
Modern DevOps combines Continuous Integration (CI), Continuous Deployment (CD), and Infrastructure as Code (IaC).
CI Tools: GitHub Actions, GitLab CI, Jenkins automate testing and building.
CD Tools: ArgoCD, Flux automate deployment to Kubernetes.
Best Practices
- Keep images small and secure
- Use health checks for reliability
- Implement proper logging and monitoring
- Use secrets management for sensitive data
- Plan for high availability and disaster recovery