DevOps Tools, CI/CD and Automation Guides

Free, hands-on Git and GitHub tutorial that walks you from `git init` to advanced rebase, stash, and history rewriting in 14 chapters. 60+ examples tested on Linux, macOS, and Windows.

Learn Kubernetes SecurityContext with practical YAML examples for runAsUser, fsGroup, Linux capabilities, privileged containers, readOnlyRootFilesystem, and Kubernetes security hardening best practices.

Learn how Kubernetes sidecar containers work with practical multi-container Pod examples. Understand shared volumes, shared network namespaces, logging sidecars, YAML configuration, and common real-world sidecar use …

Learn how to design a scalable parcel management system using APIs, database schema, event-driven architecture, queues, and cloud-native technologies like Kafka and Kubernetes.

Learn how to implement JWT authentication in Golang using Gin and PostgreSQL. This step-by-step guide covers user signup, login, JWT token generation, middleware validation, REST API usage, and common errors for building …

Learn why understanding hardware fundamentals like CPU, memory, storage, and printed circuit boards is essential for developers to build high-performance, scalable, and reliable applications in modern computing …

Learn how to delete a repository in GitHub using both the web interface and command line. This guide explains how to remove GitHub repositories, delete local Git repositories, remove files and folders, and safely clean …

Learn how to unstage files in Git using git restore, git reset, and git rm commands. This guide explains how to remove files from the staging area, undo git add, unstage all files, and keep changes safely without losing …

Learn how to use git switch to change branches in Git. This guide explains git switch vs git checkout, switching branches, creating new branches, commands, examples, and fixing common errors.

Learn how to use git show to view commit details, file changes, and diffs. This guide explains git show command usage, examples, viewing specific commits, files, tags, and comparing git show vs git diff and git log.

Learn how to use git stash to save local changes without committing. This guide covers git stash commands, examples, applying and popping stashes, listing stashes, fixing errors like no local changes to save, and …

Learn how to use git tag to create, list, push, delete, and manage tags in Git. This guide covers tagging concepts, version tagging, commands, examples, and best practices for release management.

Learn how to squash commits in Git using rebase and merge. This guide covers combining commits, squashing last N commits, squashing all commits in a branch, before and after push workflows, fixing errors, and recovering …

Learn how to set upstream in Git with practical examples, fix common errors like no upstream branch, and understand origin vs upstream. This guide covers git push --set-upstream, git branch upstream setup, fork …

Learn how to use the git rm command with practical examples. This guide covers removing files and folders, git rm vs rm differences, git rm --cached usage, undoing git rm, and handling real-world scenarios safely without …

Learn how to rename a file or directory in Git using git mv and other methods. This guide covers renaming files, folders, and directories with practical examples, preserving history, handling case sensitivity issues, and …

Learn how to use git restore command with practical examples. Understand how to restore files, undo changes, unstage files using git restore --staged, and compare git restore vs reset vs checkout. Includes syntax, use …

Learn Git reset with practical examples including soft, mixed, and hard reset. Understand the differences, use cases, and how git reset affects the working directory, staging area, and commit history. Fix common errors …

Learn how to fix the Docker error "unable to delete image (cannot be forced) - image has dependent child images". This guide explains why the error occurs, how Docker image dependencies work, and step-by-step solutions …

Learn how to build Docker images without using cache using the docker build --no-cache option. This guide explains when to disable cache, how Docker layer caching works, and provides practical examples for DevOps …

Learn how to find and remove unused Docker containers using safe and practical methods. Compare docker rm, docker container prune, filters, and automation techniques with real-world examples for production and …

Learn how to run multiple commands in Docker Compose using 4 practical methods including &&, multiline scripts, shell scripts, and Supervisor. Understand execution order, failure handling, and best practices with …

Learn how to use .dockerignore to optimize Docker builds by excluding unnecessary files. Improve build speed, reduce image size, and follow best practices with real-world examples.

Learn how to rename a Docker container using simple commands with practical examples. Understand how docker rename works, when to use it, and best practices for managing container names.

Learn how to logout from Docker registry using the docker logout command. Understand how credentials are stored, when to logout, and best practices for securing Docker authentication.

Learn how to use git push with practical examples. Understand git push syntax, push branches, tags, and fixes for common errors like rejected push and force push safely.

Learn Git workflow with lifecycle, diagram, steps, and examples. Understand Git process flow, file lifecycle, and commands like add, commit, and push in a beginner-friendly guide.

Learn how to use git pull --rebase with examples. Understand the difference between git pull and git pull --rebase, when to use rebase, and how to keep a clean commit history without merge commits.

Learn how to force git pull safely to overwrite local changes. Understand git pull force alternatives using fetch, reset, and stash with real examples to avoid data loss and conflicts.

Learn how to use git pull with practical examples. Understand git pull, git pull origin, git pull --rebase, conflict handling, and safe workflows to update your repository efficiently.