AI Driven DevOps Automation

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.

DevOps

How Java Constructor Overloading Works

See how overloaded constructors provide flexible initialization and how the this() method reduces duplicate code in a Java class.

Spring

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Understanding the Roles of Git and GitHub

Compare local distributed version control with GitHub's cloud-based collaboration, security, and DevOps features.

DevOps

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.

DevOps

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.

DevOps

Manage Git Stash History with List and Show

Learn how to inspect, compare, apply, branch, remove, and clear saved Git stash entries.

DevOps

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.

DevOps

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.

DevOps

Undoing Pushed Commits in Git Safely

Compare git revert with hard reset and force push, including the risks to shared repositories and collaborators.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

How the Gitflow Release Branch Lifecycle Works

See the commands and branching decisions for creating, testing, merging, tagging, and deleting a Gitflow release branch.

DevOps

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.

DevOps

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.

DevOps

Configure Git Credentials for Easier Repository Authentication

Set up Git's credential store, authenticate with access tokens, and troubleshoot conflicts with Git Credential Manager.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Understanding Common Programming Naming Conventions

Learn how camel, Pascal, snake, and kebab case differ, and why naming standards vary between programming languages.

Spring

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Creating and Removing Projects in GitLab

A practical walkthrough of GitLab project creation, post-creation management, and the consequences of permanently deleting a project.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

Spring

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.

DevOps

Get started with SonarQube code quality inspection

Learn how SonarQube analyzes code coverage, security, maintainability, reliability, and defects across development workflows.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Create and Use Bitbucket App Passwords for Git

Follow the Bitbucket Cloud steps to generate a scoped app password and authenticate Git operations without invalid credential errors.

DevOps

Set Up Apache Web Server 2.4 on Windows

Follow the installation steps, resolve ServerRoot configuration errors, and confirm your local Apache server is running at localhost.

DevOps

Format Git History with git log --oneline

Learn how to use oneline, graph, decorate, and all options to inspect commits and visualize branches more clearly.

DevOps

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.

DevOps

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.

Spring

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Five Practical Tomcat WAR Deployment Options

Explore local, remote, IDE-based, Maven, and Jenkins workflows for deploying Java web application archives to Apache Tomcat.

DevOps

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.

DevOps

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.

DevOps

How Spring Boot Auto-Configuration Works

Learn how Spring Boot detects dependencies, applies sensible defaults, and lets you create custom auto-configuration components.

Spring

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.

DevOps

Merging GitLab Master Into Any Branch

This tutorial demonstrates client-side Git merges for unprotected branches and merge requests for protected GitLab branches.

DevOps

Understanding kubectl and kubelet in Kubernetes

Learn how Kubernetes kubectl commands interact with a cluster while kubelet manages pods and containers on each node.

DevOps

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.

Spring

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.

DevOps

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.

DevOps

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.

Spring

Configure Spring Boot Applications with Properties Files

Explore practical ways to manage Spring Boot settings, profiles, logging, server ports, YAML files, and deployment overrides.

Spring

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.

DevOps

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.

DevOps

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.

DevOps

Imperative vs. Declarative Kubernetes Configuration

Compare direct kubectl commands with YAML manifests, kubectl apply, kubectl diff and GitOps-style configuration management.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

How Kubernetes and Docker Compose Differ

Understand how these container orchestration tools handle hosts, services, networking, scaling, and resilient deployments.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

Spring

Merging Feature Branches into GitLab Master

Understand GitLab branch permissions and use a merge request to move verified changes into the protected master branch.

DevOps

Understand Every State Reported by Git Status

Follow a practical repository workflow to recognize untracked, staged, modified, deleted, and clean working tree states.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Where Java Applications Are Used Today

See how Java powers gaming, desktop software, mobile platforms, enterprise systems, microservices, IoT devices, and browser applications.

Spring

Use ‘please’ instead of ‘sudo’ on Linux

Learn the simple shell alias command that lets you replace sudo with the more polite please command.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

Agile

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

Understanding Java Constructors and Object Initialization

Explore constructor syntax, default behavior, custom parameters, and overloaded constructor examples in Java.

Spring

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.

DevOps

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.

DevOps

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.

DevOps

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.

DevOps

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.

Other

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.

DevOps

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.

Agile

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.

DevOps