containers

I scan container images before they ever reach a registry promotion step. Trivy gives quick visibility into OS packages, language dependencies, and misconfiguration issues in IaC. The important part is failing only on risk that the team is prepared to

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

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 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

Artifact signing gives downstream systems something concrete to verify before deployment. I use cosign because it keeps container and provenance signing practical in CI. Supply chain controls only matter if verification is automated where release deci

Kubernetes orchestrates containerized workloads at scale. A Pod is the smallest deployable unit, wrapping one or more containers. Deployments manage Pod replicas with declarative updates and rollbacks. The spec.replicas field sets desired Pod count. s

Container security starts with the image build. I use small trusted bases, non-root users, explicit file ownership, and multi-stage builds that leave tooling behind. The fewer packages and privileges in the final image, the less there is to exploit.

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