CodingKit – Free programming tutorials https://codingkit.com/ Clear, hands-on tutorials that take you from the basics to real projects — free and in your language. en Docker tutorial: Get started with containers, images, and Compose https://codingkit.com/docker/ https://codingkit.com/docker/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn Docker from the basics: install it, run your first container, write a Dockerfile, and manage services with Docker Compose. Every command includes real output. Docker tutorial: What Docker is, images, and containers https://codingkit.com/docker/what-is-docker/ https://codingkit.com/docker/what-is-docker/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn what Docker is, how it solves environment differences, and how images, containers, registries, Docker Engine, and virtual machines fit together. Docker Installation Tutorial: Install Docker on Windows, macOS, and Linux https://codingkit.com/docker/install/ https://codingkit.com/docker/install/ Wed, 14 Oct 2026 00:00:00 GMT Docker Install Docker on Windows with WSL 2, macOS, and Linux (Ubuntu 26.04 / 24.04). Verify virtualization and WSL, then test with docker version and hello-world. Docker Desktop Tutorial: Explore the Interface and Its Commands https://codingkit.com/docker/docker-desktop/ https://codingkit.com/docker/docker-desktop/ Wed, 14 Oct 2026 00:00:00 GMT Docker A screen-by-screen tour of Docker Desktop, from the sidebar and container controls to logs, files, Compose projects, images, and the Docker commands behind each action. Run Your First Docker Container: docker run Tutorial https://codingkit.com/docker/first-container/ https://codingkit.com/docker/first-container/ Wed, 14 Oct 2026 00:00:00 GMT Docker Run your first Docker container with nginx: pull an image with docker run, open it in a browser, inspect it with ps, logs, and exec, and manage it with stop, start, and rm. Docker Images Tutorial: Pull, Tag, Inspect, and Understand Image Layers https://codingkit.com/docker/docker-images/ https://codingkit.com/docker/docker-images/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn Docker image names, tags, and digests, then use pull, images, tag, rmi, history, inspect, save, and load. Compare image sizes and layers. Docker Container Lifecycle Tutorial: Create, Start, Stop, and Remove Containers https://codingkit.com/docker/container-lifecycle/ https://codingkit.com/docker/container-lifecycle/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn Docker container states, why containers exit, stop vs. kill, the 10-second stop timeout, exit codes, and restart policies with real output. Docker Run Tutorial: Essential Flags and Real-World Examples https://codingkit.com/docker/docker-run/ https://codingkit.com/docker/docker-run/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn the most useful docker run flags: -d, -it, -p, -v, -e, --name, --rm, --network, --restart, resource limits, and more, with real commands and output. Docker Debugging Tutorial: Use logs, exec, inspect, cp, and stats https://codingkit.com/docker/debugging/ https://codingkit.com/docker/debugging/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn to debug Docker containers with logs, exec, inspect, cp, stats, top, and diff, and troubleshoot common startup, port, and exec format errors. Dockerfile Tutorial: Package Your App into an Image https://codingkit.com/docker/dockerfile/ https://codingkit.com/docker/dockerfile/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn to write a Dockerfile with a Node.js example. Read docker build output, understand each instruction and build cache, and use .dockerignore to shrink the build context from 30 MB to under 1 KB. Dockerfile Instructions Tutorial: Learn FROM, RUN, COPY, CMD, and ENTRYPOINT https://codingkit.com/docker/dockerfile-instructions/ https://codingkit.com/docker/dockerfile-instructions/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn the most common Dockerfile instructions and see them in action: FROM, RUN, COPY, ADD, WORKDIR, ENV, ARG, EXPOSE, USER, VOLUME, HEALTHCHECK, CMD, and ENTRYPOINT. Compare CMD and ENTRYPOINT, COPY and ADD, ARG and ENV, and see how PID 1 affects docker stop. Docker Build Cache Tutorial: Optimize Build Time and Image Size https://codingkit.com/docker/build-cache/ https://codingkit.com/docker/build-cache/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn Docker build cache rules, how instruction order affects build time, how to reduce image size by cleaning in the same layer, and how to use cache mounts and clear the build cache. Docker Multi-Stage Builds Tutorial: Create Smaller, More Secure Images https://codingkit.com/docker/multi-stage-builds/ https://codingkit.com/docker/multi-stage-builds/ Wed, 14 Oct 2026 00:00:00 GMT Docker Separate build and runtime environments with multi-stage builds. Compare Go image sizes and explore Dockerfile examples for Node.js, Java, and frontend apps. Docker Hub Tutorial: Push Images to Docker Hub and Private Registries https://codingkit.com/docker/docker-hub/ https://codingkit.com/docker/docker-hub/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn docker login, docker tag, and docker push to upload images to Docker Hub and GitHub Container Registry, and run a private Registry with registry:3. Docker Volumes Tutorial: Persist Data with Volumes and Bind Mounts https://codingkit.com/docker/volumes/ https://codingkit.com/docker/volumes/ Wed, 14 Oct 2026 00:00:00 GMT Docker Keep data after containers are removed. Learn Docker volumes, bind mounts, anonymous volumes, backup and restore, path behavior, and the PostgreSQL 18 data directory. Docker Networking Tutorial: Connect Containers with Bridge and Custom Networks https://codingkit.com/docker/networking/ https://codingkit.com/docker/networking/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn how Docker networking works, connect containers by name on custom networks, publish ports, reach the host, and troubleshoot common connection issues. Docker Environment Variables Tutorial: Configure Containers with -e, .env, and Secrets https://codingkit.com/docker/environment-variables/ https://codingkit.com/docker/environment-variables/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn -e, --env-file, Dockerfile ENV, and Compose environment, env_file, and .env substitution with real output, plus safe ways to pass secrets. Docker Compose Tutorial: Manage Multiple Containers with One File https://codingkit.com/docker/docker-compose/ https://codingkit.com/docker/docker-compose/ Wed, 14 Oct 2026 00:00:00 GMT Docker Get started with Docker Compose: launch a website, PostgreSQL, and Adminer with one compose.yaml file. See real output for up, ps, logs, stop, and down, plus Adminer login, SQL, and how down -v affects data. Docker Compose File Tutorial: Complete compose.yaml Syntax Guide https://codingkit.com/docker/compose-file/ https://codingkit.com/docker/compose-file/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn the complete syntax of Docker Compose's compose.yaml file, including services, builds, ports, volumes, health checks, profiles, overrides, and validation. Docker Compose Commands Tutorial: Manage Services, Logs, and Containers https://codingkit.com/docker/compose-commands/ https://codingkit.com/docker/compose-commands/ Wed, 14 Oct 2026 00:00:00 GMT Docker A practical guide to Docker Compose commands: up, down, ps, logs, exec, run, pull, and config. See why restart does not apply compose.yaml changes and when to use up -d. WordPress with Docker Compose Tutorial: Set Up WordPress and MySQL https://codingkit.com/docker/wordpress/ https://codingkit.com/docker/wordpress/ Wed, 14 Oct 2026 00:00:00 GMT Docker Set up WordPress 7 and MySQL 8.4 with Docker Compose. Configure health checks, persistent data, upload limits, phpMyAdmin, backups, restores, and image updates. Python Docker Tutorial: Deploy Flask, FastAPI, and Django Apps https://codingkit.com/docker/python/ https://codingkit.com/docker/python/ Wed, 14 Oct 2026 00:00:00 GMT Docker Package Python apps as Docker images with tested Flask, FastAPI, and Django examples, development reload, collectstatic, uv locks, and image size comparisons. Docker Node.js Deployment Tutorial: Express, TypeScript, and Next.js https://codingkit.com/docker/nodejs/ https://codingkit.com/docker/nodejs/ Wed, 14 Oct 2026 00:00:00 GMT Docker Build Node.js images with Docker: use npm ci, run as a non-root user, handle SIGTERM, build TypeScript apps, slim Next.js images, and reload code during development. Nginx with Docker Tutorial: Static Sites and Reverse Proxying https://codingkit.com/docker/nginx/ https://codingkit.com/docker/nginx/ Wed, 14 Oct 2026 00:00:00 GMT Docker Serve static sites with Nginx in Docker, configure SPA fallbacks and caching, validate config, proxy to backend containers, troubleshoot 502 errors, and enable HTTPS with Caddy. Run MySQL in Docker: Setup, Connections, Backup and Restore https://codingkit.com/docker/mysql/ https://codingkit.com/docker/mysql/ Wed, 14 Oct 2026 00:00:00 GMT Docker Run MySQL 8.4 in Docker with real output: environment variables, init SQL, utf8mb4, connecting from the container, host and other containers, localhost vs 127.0.0.1, the Compose health check trap, mysqldump backup and restore, and why a changed password variable has no effect. Docker PostgreSQL Tutorial: Install, Connect, Back Up, and Upgrade https://codingkit.com/docker/postgresql/ https://codingkit.com/docker/postgresql/ Wed, 14 Oct 2026 00:00:00 GMT Docker Run PostgreSQL 18 in Docker with real output: its new data directory, Compose setup, pg_isready health check, psql commands, passwordless container access, backups, restores, and a 16-to-18 upgrade. Redis with Docker Tutorial: Set Passwords, Persist Data, and Connect https://codingkit.com/docker/redis/ https://codingkit.com/docker/redis/ Wed, 14 Oct 2026 00:00:00 GMT Docker Run Redis 8 with Docker: use redis-cli, configure passwords, compare RDB and AOF persistence, test memory eviction, and connect a Flask app with Compose. Docker Cleanup Tutorial: Reclaim Disk Space with Prune Commands https://codingkit.com/docker/cleanup/ https://codingkit.com/docker/cleanup/ Wed, 14 Oct 2026 00:00:00 GMT Docker Is Docker using too much disk space? Find out with docker system df, then safely clean up containers, images, volumes, builder cache, and logs. Docker Security Best Practices Tutorial: 10 Ways to Secure Containers https://codingkit.com/docker/security/ https://codingkit.com/docker/security/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn Docker container security with hands-on examples: run as non-root, pin image versions, keep secrets out of layers, use BuildKit secrets, restrict ports and privileges, set resource limits, protect docker.sock, and scan and patch vulnerabilities with Trivy. Build Multi-Platform Images (amd64 and arm64): Docker Buildx Tutorial https://codingkit.com/docker/multi-platform/ https://codingkit.com/docker/multi-platform/ Wed, 14 Oct 2026 00:00:00 GMT Docker Image built on an Apple Silicon Mac fails on a server with exec format error? Learn CPU architectures and multi-platform images, build linux/amd64 and linux/arm64 at once with docker buildx and Go cross-compilation, inspect with docker images --tree, push and check the manifest, and know when you need QEMU. Docker deployment tutorial: Deploy a website to a cloud server (VPS) https://codingkit.com/docker/deploy/ https://codingkit.com/docker/deploy/ Wed, 14 Oct 2026 00:00:00 GMT Docker Deploy a Docker app to a Linux cloud server with a complete walkthrough: build and push an image, run it with Compose, update and roll back, automate backups, and review a launch checklist. Docker Internals Tutorial: How Namespaces, cgroups, and overlayfs Work https://codingkit.com/docker/internals/ https://codingkit.com/docker/internals/ Wed, 14 Oct 2026 00:00:00 GMT Docker See what a container is on a Docker host: a Linux process isolated by namespaces, limited by cgroups, and given a filesystem by overlayfs. Inspect PIDs, resource limits, image layers, and security controls. Docker Commands Cheat Sheet: Essential Commands for Containers, Images, and More https://codingkit.com/docker/cheatsheet/ https://codingkit.com/docker/cheatsheet/ Wed, 14 Oct 2026 00:00:00 GMT Docker A one-page guide to the Docker commands you use most: containers, images, builds, volumes, networks, Compose, cleanup, and system info, with concise explanations. Docker build command tutorial: options and examples https://codingkit.com/docker/docker-build/ https://codingkit.com/docker/docker-build/ Wed, 14 Oct 2026 00:00:00 GMT Docker A complete guide to docker build options (-t, -f, --build-arg, --target, --no-cache, --pull, --platform, --progress, --secret, --check, -q, and more), with Docker 29 examples for naming images, passing build arguments, choosing a Dockerfile, building to a stage, and viewing full build output. Docker exec tutorial: Run commands in a running container https://codingkit.com/docker/docker-exec/ https://codingkit.com/docker/docker-exec/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn every docker exec option, including -it, -u, -w, -e, -d, --env-file, and --privileged. Examples cover shells, users, directories, environment variables, background tasks, and stopped containers. Docker ps Tutorial: List Containers with Filters and Custom Formatting https://codingkit.com/docker/docker-ps/ https://codingkit.com/docker/docker-ps/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn docker ps options: list all containers, filter by status, name, or label, customize output, show sizes, and remove stopped containers. Includes Docker 29 examples. Docker Logs Tutorial: View Container Logs with -f, --tail, and --since https://codingkit.com/docker/docker-logs/ https://codingkit.com/docker/docker-logs/ Wed, 14 Oct 2026 00:00:00 GMT Docker A complete guide to docker logs options (-f, -n/--tail, -t, --since, --until, --details), with Docker 29 examples for filtering, timestamps, stdout and stderr, grep, and following new logs. Docker cp Tutorial: Copy Files Between a Host and Container https://codingkit.com/docker/docker-cp/ https://codingkit.com/docker/docker-cp/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn docker cp syntax and how to copy files and folders between containers and hosts, handle missing files, and back up or restore databases on Windows. Docker inspect Tutorial: View Detailed Container and Image Information with -f Format Examples https://codingkit.com/docker/docker-inspect/ https://codingkit.com/docker/docker-inspect/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn Docker inspect options and Go templates with real Docker 29 examples for container state, IPs, environment variables, image details, volumes, networks, and the removed IPAddress field. Docker Volume Commands Tutorial: Create, List, Inspect, and Remove Volumes https://codingkit.com/docker/docker-volume/ https://codingkit.com/docker/docker-volume/ Wed, 14 Oct 2026 00:00:00 GMT Docker A complete guide to docker volume create, ls, inspect, rm, and prune, with hands-on Docker 29 examples for writing data, finding dangling anonymous volumes, labels, and prune versus prune -a. Docker Network Command Tutorial: Create Networks, Connect Containers, and Use Aliases https://codingkit.com/docker/docker-network/ https://codingkit.com/docker/docker-network/ Wed, 14 Oct 2026 00:00:00 GMT Docker A complete guide to the docker network create, ls, inspect, connect, disconnect, rm, and prune commands, with examples tested on Docker 29. Docker Compose Up Tutorial: Options and Examples https://codingkit.com/docker/docker-compose-up/ https://codingkit.com/docker/docker-compose-up/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn `docker compose up` options including `--build`, `--wait`, `--scale`, and `--exit-code-from`, with practical Docker Compose v5 examples. Docker Compose Down Tutorial: Stop and Remove Containers, Networks, and Volumes https://codingkit.com/docker/docker-compose-down/ https://codingkit.com/docker/docker-compose-down/ Wed, 14 Oct 2026 00:00:00 GMT Docker Learn docker compose down options, including -v, --rmi, --remove-orphans, and --timeout, with examples and the differences between down, stop, and rm. Docker init tutorial: Generate a Dockerfile and compose.yaml automatically https://codingkit.com/docker/docker-init/ https://codingkit.com/docker/docker-init/ Tue, 13 Oct 2026 00:00:00 GMT Docker Use docker init to answer a few questions and generate a Dockerfile, compose.yaml, .dockerignore, and README.Docker.md. See the full Node.js walkthrough, review each generated file, use docker build --check to find two template warnings, and learn where the PostgreSQL example fails with postgres:18. Rootless Docker and Podman Tutorial: Run Containers Without Root https://codingkit.com/docker/rootless-podman/ https://codingkit.com/docker/rootless-podman/ Tue, 13 Oct 2026 00:00:00 GMT Docker See how Rootless Docker maps container root to an unprivileged host user, blocks access to /etc/shadow, and compare it with daemonless Podman. GitHub Actions Docker CI/CD Tutorial: Build and Push Images Automatically https://codingkit.com/docker/ci-cd/ https://codingkit.com/docker/ci-cd/ Tue, 13 Oct 2026 00:00:00 GMT Docker Automatically build multi-platform Docker images and push them to GitHub Container Registry, then deploy to a server over SSH. Includes a complete workflow, tag rules, build cache, and actionlint validation. Docker Error Messages: Causes and Fixes (With Real Output) https://codingkit.com/docker/errors/ https://codingkit.com/docker/errors/ Tue, 13 Oct 2026 00:00:00 GMT Docker Find the cause of Docker errors like daemon connection failures, permission denied, port conflicts, missing files, Compose health checks, and PowerShell issues, with real output and fixes.