docker

Health checks verify container readiness and liveness. The HEALTHCHECK Dockerfile instruction defines container-level checks. Kubernetes readinessProbe gates traffic routing—failing probes remove Pods from Service endpoints. livenessProbe detects dead

Master Docker networking modes and custom network creation. Understand bridge networks for container isolation, host mode for direct host networking, and overlay networks for multi-host Swarm communication. Configure DNS resolution, port mapping, and

A single-stage Dockerfile tends to ship your entire build toolchain into production, which makes images bigger and slower to deploy. I prefer multi-stage builds: one stage installs deps + builds, the final stage runs only the minimal production output

Manage container images across registries including Docker Hub, AWS ECR, and GitHub Container Registry. Automate image tagging strategies, implement lifecycle policies for cleanup, scan for vulnerabilities with Trivy, and set up cross-region replicati

Docker packages Spring Boot applications with dependencies into portable containers. Multi-stage builds optimize image size—build stage compiles code, runtime stage contains only necessities. I use official OpenJDK base images. Layered JARs improve ca

Docker Compose orchestrates multi-container applications with a single YAML file. The docker-compose.yml defines services, networks, and volumes declaratively. Each service maps to a container with its own image, ports, environment, and dependencies.

Optimized Docker images reduce build time, storage, and attack surface. Alpine-based images start at 5MB versus 100MB+ for Debian. Multi-stage builds separate build tools from runtime—final image contains only production artifacts. Layer ordering matt

Docker packages applications into lightweight, portable containers. A Dockerfile defines build instructions—each instruction creates an immutable layer. The FROM directive sets the base image. COPY and ADD bring files into the image. RUN executes comm