100 Docker & Containers resources for developers

Separate build-time dependencies from the final runtime image using 'FROM ... AS build' and 'COPY --from=build' to reduce image size by up to 90%.

Use 'RUN --mount=type=cache,target=/root/.npm' to persist package manager caches between builds, significantly reducing CI/CD build times.

Use GoogleContainerTools/distroless as the final stage base to remove shells and package managers, minimizing the attack surface.

Copy dependency files (package.json, go.mod) and run install commands before copying the rest of the source code to maximize layer reuse.

Integrate Hadolint into your CI pipeline to enforce Dockerfile best practices and catch inefficient instructions like 'RUN apt-get upgrade'.

Explicitly create a system user and use the 'USER' instruction to avoid running container processes as root, preventing container breakout exploits.

Use 'tini' as your entrypoint to correctly handle signal forwarding and reap zombie processes in containers running complex applications.

Exclude .git, node_modules, and local build artifacts to prevent sending unnecessary context to the Docker daemon and bloating layers.

Avoid the ':latest' tag; use specific semantic versions or SHA256 hashes for base images to ensure build reproducibility across environments.

Use the 'dive' CLI tool to analyze image layers and identify wasted space or files that should have been excluded from the final image.

Use 'depends_on' with 'condition: service_healthy' to ensure the application only starts after the database is ready to accept connections.

Define 'profiles' in your YAML to selectively start services, such as 'debug' or 'testing' tools, without cluttering the default stack.

Map local source directories to container paths using volumes to enable live-reloading frameworks (like Vite or Nodemon) without rebuilding.

Utilize '.env' files alongside 'env_file' directives to manage secrets and configurations locally without hardcoding values in the YAML.

Define external networks to allow communication between separate Compose projects while keeping database traffic isolated from the public bridge.

Apply 'deploy.resources.limits' in Compose files to simulate production constraints (CPU/Memory) and prevent local resource exhaustion.

Run Traefik in a container to provide automatic SSL and local domain routing (e.g., app.localhost) for multiple Compose services.

Use 'docker-compose.override.yml' for local-only settings like debug ports, keeping the base YAML clean for production-like environments.

Use named volumes instead of host paths for database data to improve I/O performance on macOS and Windows via VirtioFS.

Manage containers, logs, and resource usage from the terminal using 'lazydocker' for faster troubleshooting than the standard CLI.

Run 'trivy image <name>' in your CI pipeline to detect CVEs in OS packages and application dependencies before deployment.

Set 'read_only: true' in Compose or '--read-only' in CLI to prevent attackers from writing malicious scripts to the container's disk.

Configure the 'json-file' logging driver with 'max-size' and 'max-file' limits to prevent container logs from consuming all host disk space.

Apply custom Seccomp profiles to restrict the system calls a container can make, mitigating kernel-level exploits.

Generate a Software Bill of Materials (SBOM) using Docker Scout to track exactly which software versions are running in production.

Schedule 'docker system prune -af --volumes' via cron to remove dangling images and unused networks that accumulate on build nodes.

Configure GitHub Actions to use 'docker/login-action' with temporary GITHUB_TOKEN for secure image pushes to GitHub Container Registry.

Deploy Portainer as a lightweight management UI to visualize container health and manage remote Docker engines via an agent.

Use the Watchtower container to automatically pull the latest images and restart containers when a new version is pushed to the registry.

Deploy cAdvisor to collect real-time resource usage and performance characteristics of running containers for Prometheus scraping.