August 12, 2026 Docker run vs Docker Compose: Which Should You Use? Compare one-off docker run commands with repeatable Compose configuration for single-container and multi-container applications. How Java Constructor Overloading Works See how overloaded constructors provide flexible initialization and how the this() method reduces duplicate code in a Java class. How to Generate and Use a GitHub Access Token A practical walkthrough for replacing GitHub password authentication with a personal access token for repository operations. Push Local Project Files to an Existing GitHub Repository Follow practical Git commands for cloning a repository or initializing an existing project, adding a remote, committing files, and pushing to GitHub. Finding and Using a GitHub URL with Git Learn where to locate a repository's GitHub URL and use it to clone, fetch, push, and pull code with Git. How to Delete Local Git Branches Safely Use -d for safe deletion, -D for forced deletion, remove remote branches separately, and recover accidentally deleted branches with the reflog. How to Clone a GitHub Repository Using SSH Keys This quick video walkthrough covers SSH key creation, GitHub configuration, repository URLs, and the Git command needed to clone over SSH. Push a Local Git Branch to a Remote Repository This example explains how to create a branch, establish upstream tracking, and push subsequent changes to GitHub or GitLab. Fix Git Commit Errors with User Configuration Use git config commands to define your author name and email, check saved values, and understand global, local, and worktree settings. Configure GitHub SSH Keys for Secure Git Operations Learn how to generate an SSH key pair, add the public key to GitHub, and use SSH URLs for cloning, pushing, and pulling Git repositories. Safely Unstage Files in Git Before You Commit Use git restore --staged to remove files from Git’s index without deleting them from your project. Set Up GitLab SSH Authentication for Git This tutorial walks through creating an SSH key pair, registering it in GitLab, and cloning repositories for secure Git operations. Installing Docker and Compose on an Ubuntu Workstation Learn how to prepare Ubuntu, add Docker's package repository, install the Docker Compose plugin, and test the installation with common commands. Remove a Local Git Repository with Git Commands Delete the hidden .git directory from a repository using File Explorer or rm, then confirm that Git no longer recognizes the folder. Understanding the Difference Between Git Pull and Fetch See how Git fetch, pull, merge, and status work together to synchronize repositories while protecting local changes. Push a Local Project to a GitLab Repository Follow the Git commands for uploading an existing project to GitLab, including guidance for empty repositories, existing histories, and force pushes. Understanding Linux chmod Permission Numbers See how numeric permissions represent user, group, and other access, why 777 is risky, and how the principle of least privilege applies. How to Clone and Check Out a Specific Git Commit Clone a repository, switch to an exact commit, create a branch from it, or use a shallow clone to reduce downloaded history. Safely Remove a File from the Git Staging Area Use git restore --staged to undo git add, and understand when older Git commands such as reset or rm --cached may cause problems. Configure Modern Nginx with PHP-FPM and FastCGI Install Nginx and PHP-FPM on Ubuntu, connect them through the PHP-FPM Unix socket, validate the configuration and safely test PHP processing. Understanding the Roles of Git and GitHub Compare local distributed version control with GitHub's cloud-based collaboration, security, and DevOps features. Restore Shelved Changes with git stash pop Learn how to stash changes, restore them with git stash pop, handle conflicts, and understand how pop differs from git stash apply. Learn Git Workflows with Sourcetree and Bitbucket This beginner-friendly video course covers Git installation, repository collaboration, commit history, branching, merge conflicts, rebasing, and pull requests. Manage Git Stash History with List and Show Learn how to inspect, compare, apply, branch, remove, and clear saved Git stash entries. Set Up a GitHub SSH Connection on Windows This step-by-step example shows how to create SSH keys, register the public key with GitHub, and clone a repository securely from Windows. Understanding Bare Git Repositories in Git See how bare repositories differ from normal working repositories and why teams use them as shared remotes for collaboration. Undoing Pushed Commits in Git Safely Compare git revert with hard reset and force push, including the risks to shared repositories and collaborators. Set Up an Apache Reverse Proxy with Tomcat Follow a practical Apache HTTP Server configuration example that forwards client requests to a Tomcat application through mod_proxy. Build an Nginx Reverse Proxy with Docker Compose Use a custom Nginx image, Docker Compose networking and proxy headers to route requests safely to a Tomcat backend. Delete Every Local Git Branch Except Main or Master Use Git, grep, and xargs to clean up local branches while avoiding the currently checked-out branch and leaving remote repositories unchanged. Dockerfile and docker-compose: How They Differ Learn how Dockerfiles build images, how Compose runs containers, and how the two work together with practical Nginx examples. How the Gitflow Release Branch Lifecycle Works See the commands and branching decisions for creating, testing, merging, tagging, and deleting a Gitflow release branch. Cherry-Picking Git Commits Across Branches This tutorial demonstrates how to apply one commit from another branch and explains why Git brings over only that commit's changes. Master the Basics of Git and GitHub This beginner-friendly video explains essential Git commands, repository workflows, branching, and GitHub features for collaborative software development. Configure Git Credentials for Easier Repository Authentication Set up Git's credential store, authenticate with access tokens, and troubleshoot conflicts with Git Credential Manager. List and Inspect Git Config Settings Use git config list, get, show-origin and show-scope commands to identify effective values and troubleshoot settings across system, global, local, worktree and command scopes. Move Uncommitted Changes to a New Git Branch Use Git switch to create a new branch without losing your current work, commit the changes there and return to a clean original branch. Resolve PuTTY SSH Key Exchange Errors Discover why older PuTTY versions fail to connect to AWS EC2 and other remote servers, and the first fix to try. Create Git Branches with Four Useful Commands See how to create and switch to branches, start branches from tags or commits, and inspect your current Git branch. Understanding Common Programming Naming Conventions Learn how camel, Pascal, snake, and kebab case differ, and why naming standards vary between programming languages. Clone One Git Branch with Git Commands See how single-branch clones work, how they affect branch switching, and how shallow clones can save time and storage in CI/CD pipelines. Push an Existing Git Project to Bitbucket Follow the Git workflow for creating a Bitbucket repository, adding a remote, committing project files, and pushing the correct branch. Run Apache httpd with Docker Compose This practical example shows how a docker-compose.yaml file simplifies Apache container configuration, port publishing, and local content mounting. Remove Remote Git Branches with Git Commands Follow the commands for deleting a branch on a remote repository, pruning its local tracking reference, and optionally removing the local branch. Convert AWS PEM Keys for PuTTY Connections Follow these steps to make an EC2 PEM key compatible with PuTTY and use the resulting PPK file for SSH authentication. A Complete Example of the Gitflow Hotfix Process Follow a practical Gitflow walkthrough for creating a hotfix branch, committing an urgent fix, merging it into the production and develop branches, and removing the hotfix branch. How to Track Empty Directories with .gitkeep Follow a quick Git workflow to create a .gitkeep file, commit an otherwise empty folder, and push it to GitHub or GitLab. Delete Git Branches Locally and on a Remote Use git push and git branch to remove remote, local, and remote tracking branches, then verify the cleanup with git branch -a. Git Rebase a Branch onto Master: An Example Learn the Git rebase command, see how it changes commit history, and understand why rebasing shared branches can cause problems. Safely Delete Git Submodules Learn the Git commands needed to remove a submodule, clean up its configuration and metadata, commit the changes, and push them to a remote repository. Undo Your Last Git Changes with Reset and Clean This video explains how to restore a repository after unwanted changes using hard reset and cleanup commands. Clone GitHub and GitLab Repositories from Ubuntu Follow a practical Ubuntu Git workflow, from installing Git and cloning a repository to committing, pushing, branching, and viewing reflog history. Creating and Removing Projects in GitLab A practical walkthrough of GitLab project creation, post-creation management, and the consequences of permanently deleting a project. Git Forks Explained: How to Fork GitHub Repositories from the CLI Learn what a Git fork means, how GitHub and GitLab forks work, and how to create a GitHub fork from the terminal with the GitHub CLI. Inspect GitHub Actions Variables Across Operating Systems Learn which default and system environment variables GitHub Actions runners expose, and use a cross-platform YAML workflow to list them yourself. Copy Files from Docker Containers to the Host Use the docker cp command to retrieve files, rename them during transfer, and customize container configuration on your host. Tidy Git History by Pruning Branches and Commits This hands-on guide demonstrates how to simplify branch histories, remove unused branches, preserve file content, and compact a Git repository. Jenkins Git Variables for Shell Script Builds Learn which Git environment variables Jenkins provides, then test their values in a freestyle project with a batch script. Host a Website for Free Using GitHub Pages This tutorial demonstrates GitHub Pages deployment and explains how to connect a GoDaddy domain to the hosted site. Use Notepad++ for Git Commit Messages on Windows Configure Git to open Notepad++ instead of Vim when a commit, merge or rebase requires you to enter text. Download DevOps Interview Questions for Experienced Engineers Get the PDF version of the DevOps interview questions article and explore related preparation resources for experienced applicants. Add and Push Git Submodules Across GitHub and GitLab Follow a practical example of linking independent repositories, tracking the .gitmodules file, and pushing parent and submodule changes separately. Publish GitHub Actions Build Artifacts for Download Follow a practical workflow example that creates a temporary folder, uploads selected files, and packages them as a downloadable artifact. Learn Apache Maven to Build and Package Java Projects This beginner-friendly video covers Maven installation, core commands, dependency management, testing, deployment, plugins, Jenkins, Docker, and cloud-native applications. Create a New Git Repository from the Command Line This quick guide explains how git init works, how to commit files in a new or existing project, and how to clone repositories from GitHub or GitLab. Get started with SonarQube code quality inspection Learn how SonarQube analyzes code coverage, security, maintainability, reliability, and defects across development workflows. Understanding Hard and Soft Git Resets See how each reset mode changes local commits, the staging area, and the working tree, with practical command examples. Customize Git Bash Prompt Settings with Shell Configuration Follow a quick example for editing git-prompt.sh and changing the Git Bash window title, displayed user and host text, colors, and path. Forking Git Repositories with GitHub, GitLab, or Local Copies Understand how repository forks differ from clones and how cloud hosting services provide fork functionality beyond core Git. 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Learn how to use oneline, graph, decorate, and all options to inspect commits and visualize branches more clearly. Create a Bare Git Repository with Two Simple Commands See when to use git clone --bare versus git init --bare, and why bare repositories are useful for hosting source code and maintaining backups. Understanding GET and POST in HTTP APIs Explore how GET retrieves resources while POST submits data or triggers processing, and see where PUT and PATCH fit into REST API design. Edit Ubuntu Hosts Entries for Local Domain Testing This video explains how to map domains to 127.0.0.1 through /etc/hosts, verify the change with ping, and safely remove mappings when finished. Move Your Domain from GoDaddy to Route 53 Follow the key steps for transferring a domain to AWS, updating DNS, verifying propagation, and mapping subdomains to cloud resources. Should Git Commits Use the Imperative Mood? A practical discussion of Git commit message conventions, past-tense descriptions, team standards, and the tradeoffs of imperative wording. How to Clone Git Repositories with Submodules Learn how git clone, git submodule init, git submodule update, and --recurse-submodules work together to retrieve submodule code. Five Practical Tomcat WAR Deployment Options Explore local, remote, IDE-based, Maven, and Jenkins workflows for deploying Java web application archives to Apache Tomcat. Build and Deploy Your First Python Lambda Function This quick walkthrough shows how to create a serverless Python function, customize its code, and view execution results in the AWS console. Learn GitHub Actions Through 10 Practical CI/CD Examples A practical collection covering workflow basics, multi-step and multi-job builds, operating systems, Java with Maven, caching, and artifacts. How Spring Boot Auto-Configuration Works Learn how Spring Boot detects dependencies, applies sensible defaults, and lets you create custom auto-configuration components. A Beginner’s Guide to GitHub Desktop This video tutorial explains how to manage Git repositories, collaborate with teams, work with branches, and use GitHub Desktop features. Merging GitLab Master Into Any Branch This tutorial demonstrates client-side Git merges for unprotected branches and merge requests for protected GitLab branches. Understanding kubectl and kubelet in Kubernetes Learn how Kubernetes kubectl commands interact with a cluster while kubelet manages pods and containers on each node. Build REST APIs and Microservices with Spring Boot Learn Spring Boot REST API development through a project that covers HTTP methods, JSON data, JavaScript clients, testing, and cloud deployment. Fix Git SSL Certificate Errors When Cloning Repositories A command-line workaround for GitHub and GitLab access problems, with an important warning about disabling SSL certificate verification. Deploy a Static Website Using Amazon S3 and Route 53 Follow the main AWS setup steps for uploading website files, configuring public access, enabling S3 hosting, and connecting a custom domain. Managing Spring Boot Configuration with Profiles See how to organize environment-specific settings, activate profiles, and customize dependency injection with Spring properties, YAML, and @Profile. Configure Spring Boot Applications with Properties Files Explore practical ways to manage Spring Boot settings, profiles, logging, server ports, YAML files, and deployment overrides. Protect Tokens with GitHub Actions Secrets This practical tutorial shows how to add repository secrets, use them in workflow files, and keep sensitive values masked in GitHub Actions logs. A Complete Gitflow Init Workflow from Feature to Release Follow a practical Gitflow example that starts with git flow init and covers feature work, release preparation, branch merges, and version tagging. Trigger Jenkins Builds Remotely with URLs This example explains Jenkins remote build triggers, authentication credentials, cURL testing, Java integration, and ways to address 403 errors. Imperative vs. Declarative Kubernetes Configuration Compare direct kubectl commands with YAML manifests, kubectl apply, kubectl diff and GitOps-style configuration management. Least Privilege in Practice: Examples and Security Best Practices Explore everyday, Linux, AWS S3, and web server examples of limiting access to only the permissions users and systems need. Build and Deploy a Java Function with AWS Lambda Follow a concise example that shows how Java Lambda handlers receive payloads, write logs, transform text, and run in AWS. Renaming a GitHub Repository: Steps and User Impact Follow the GitHub settings workflow to change a repository name and see how GitHub redirects old remote URLs for existing users. Stop Tracking a Committed File in Git Use git rm --cached and a .gitignore entry to remove a file from the repository while keeping it in your local working directory. How to Send SMS Messages with Amazon SNS This video explains how to configure Amazon SNS and trigger SMS notifications from a Python-based AWS Lambda function. Rebasing GitHub Branches and Commits Safely Learn how to rebase feature and master branches, handle rejected pushes, and understand the risks of force-pushing rewritten Git history. How Kubernetes and Docker Compose Differ Understand how these container orchestration tools handle hosts, services, networking, scaling, and resilient deployments. Amend the Latest Git Commit Message with Git See how git commit --amend updates the visible message, why Git creates a new commit, and what to consider before sharing the change. Fix Docker Login Errors with a Docker Hub Token Create a Docker Hub access token, authenticate from the command line, and understand the security benefits and tradeoffs of token-based access. Creating and Cloning Private Repositories on GitHub Follow this example to create a private repository, resolve cloning errors, and connect your local Git commands to GitHub. Install GitLab on Ubuntu 20 for Self-Hosted DevOps Follow the terminal commands and configuration steps for running a local GitLab server on Ubuntu instead of using the cloud. Understanding Java's Ten Constructor Variations Learn how Java constructors create objects, initialize state, support inheritance, and differ across default, canonical, generic, private, and overloaded forms. Merging Feature Branches into GitLab Master Understand GitLab branch permissions and use a merge request to move verified changes into the protected master branch. Understand Every State Reported by Git Status Follow a practical repository workflow to recognize untracked, staged, modified, deleted, and clean working tree states. Create and Rename an AWS Account Alias Learn how to set up a memorable AWS account alias so users can sign in without memorizing a 12-digit account ID. Installing Gitflow on Legacy Git for Windows Setups Follow the Windows installation steps, verify Gitflow, and try feature and release branch commands in a test repository. Serve Local Website Files from a Dockerized Apache Server Use a Docker bind mount to test and update a website locally without building a custom Apache image or copying files into the container. Work on Multiple Git Branches Without Switching This video tutorial demonstrates how Git worktrees isolate branches in separate folders, helping you avoid repeated stashing and branch switching. Manage Multiple AWS Accounts with AWS CLI Profiles See how to add named AWS CLI profiles for separate IAM accounts and select the right credentials when running commands. Where Java Applications Are Used Today See how Java powers gaming, desktop software, mobile platforms, enterprise systems, microservices, IoT devices, and browser applications. Use ‘please’ instead of ‘sudo’ on Linux Learn the simple shell alias command that lets you replace sudo with the more polite please command. Deploy Java and Spring Boot Apps with Elastic Beanstalk Learn a straightforward approach to hosting server-side Java applications in AWS, from packaging and port configuration to scaling and load balancing. Deleting a Remote GitLab Branch from the Command Line Learn the Git commands for removing a local branch, its remote tracking branch, and the corresponding branch from a GitLab repository. How to Use Git Stash to Shelve and Reapply Changes See a practical Git workflow for temporarily storing experimental changes, making commits, and restoring your work with stash apply or pop. Learn Git with the GitKraken Client This beginner-friendly video course explains how to use GitKraken for repositories, commit history, branches, collaboration, and Git hosting integrations. Perform a Shallow Git Clone with the Depth Option Learn how to limit Git history, clone a specific branch, choose a target directory, and reduce local repository size. Rebasing the Git Master Branch Onto Another Branch A practical example of rebasing master onto develop, with guidance on commit history changes, force pushes, and repository protections. Git Cherry-Pick Explained With a Modern Practical Example See what happens when you cherry-pick a commit, including which changes are reapplied and how Git records the new commit. Configure Jenkins Matrix Builds for Parallel Jobs This video tutorial shows how Jenkins multi-configuration projects use axes, Maven, and parameterized stages to run 16 related builds. Deploy Spring Boot Applications on AWS with Fargate Follow a video walkthrough for containerizing a Spring Boot app, running it with Amazon ECS and Fargate, and accessing it through a public IP address. Deploy a Java WAR to Tomcat Using Maven Follow five practical steps to configure Tomcat and Maven, run the Tomcat deployment plugin, and verify your web application. Remove a Protected Windows Recovery Partition with DiskPart This guide explains the DiskPart commands needed to delete a hidden recovery partition and make space for expanding the primary Windows drive. How Git and GitLab Compare for Modern Development Learn why Git remains the core version control tool while GitLab adds hosting, collaboration, automation, security, and lifecycle management. Create a GitLab Project and Clone Its Repository Follow the steps to create a GitLab repository, retrieve its URL, clone it with Git, and verify the local copy on Ubuntu. Git Shelve vs. Stash: How to Save Local Changes Learn why Git has no shelve command and how to use git stash, apply, and aliases to temporarily save and restore local changes. Push Local Git Commits to a GitLab Origin Follow a practical command-line example to add, commit, push, verify, and authenticate changes in a GitLab repository. Being Agile and Doing Agile in Software Development Understand how Agile values differ from Agile practices, and learn how teams and organizations can combine both for continuous delivery. How Git Tracks Files from Working Tree to Commit History See how the working tree, staging index, and commit history interact through practical git status examples. Secure GitHub Access with SSH Keys on Windows and Linux This video demonstrates ssh-keygen, SSH key configuration, repository cloning, and secure Git operations from Windows and Ubuntu. Understanding Git Log and Reflog See when Git log and git reflog show different histories, and learn how resets, amended commits, cloning, and walk-reflogs affect their output. Deploy a Java WAR to Tomcat with Jenkins Follow a four-step process to configure Tomcat credentials, install the Jenkins deployment plugin, build the WAR, and verify the deployed application. Understanding Java Constructors and Object Initialization Explore constructor syntax, default behavior, custom parameters, and overloaded constructor examples in Java. How to Use Jenkins Shared Libraries in Pipelines Learn how to store Groovy logic in GitHub, configure a global Jenkins pipeline library, and use it from scripted or declarative pipelines. Git Stash Pop vs. Apply: Restoring Files and Handling Conflicts Learn how git stash pop and git stash apply differ, including stash history, conflict resolution, and examples of restoring file changes. Questioning the Wisdom of the 12-Factor App This critique examines whether the 12-Factor App adds actionable insight for experienced cloud-native, Spring, and Java EE developers. How to Host a Personal Website with GitHub Pages This tutorial explains how to create a GitHub Pages repository, configure its branch, publish static web resources, and support Google indexing. Why Client-Side Rendering Frameworks Can Benefit Web Applications Learn how client-side rendering can reduce server demands, simplify deployments, improve perceived performance, and support flexible, resilient user interfaces. Set Up Nexus OSS and Upload Your First Maven Artifact This tutorial walks through a Windows installation of Nexus Repository Manager OSS 2.14, from startup and administration to uploading a Java JAR. Understanding How Agile and DevOps Work Together Explore the distinctions between Agile and DevOps, from development philosophy and team culture to automation, continuous delivery, and deployment. Docker Images and Containers: Understanding the Difference Learn how Dockerfiles define images, how images become running containers, and how to build, run, and inspect them with Docker commands.