Devops

DevOps tooling, automation workflows, CI/CD pipelines, and infrastructure practices.

Changing a Git commit message with git commit --amend

Aug 25, 2026 • 8 min read

How to Change a Git Commit Message, Even After Pushing

Change the last Git commit message with git commit --amend, reword older commits with an interactive rebase, and update commits you already pushed.

Renaming a local and remote Git branch with git branch -m

Aug 24, 2026 • 5 min read

How to Rename a Git Branch: Local and Remote

This guide shows how to rename a Git branch locally and on the remote using git branch -m, then push the new name and delete the old remote branch.

Aug 23, 2026 • 14 min read

500 Internal Server Error: What It Means & How to Fix It

A 500 Internal Server Error means the server encountered an unexpected condition. This guide explains common causes, how to diagnose the problem using log files, and steps to fix it.

Jul 29, 2026 • 10 min read

How to Install Kubernetes with kubeadm on Ubuntu 26.04

Install Kubernetes 1.36 on Ubuntu 26.04 with kubeadm and containerd, configure Flannel networking, join worker nodes, and verify the cluster.

Kubernetes control plane and worker nodes installed with kubeadm on Ubuntu 26.04

Jul 27, 2026 • 6 min read

How to Install Docker on Ubuntu 26.04

Install Docker on Ubuntu 26.04 from the official Docker repository. Covers repository setup, verification, running without sudo, updates, and uninstall steps.

Jul 23, 2026 • 7 min read

How to Connect to a Docker Container

This guide explains how to connect to a running Docker container using docker exec and docker attach, with examples for getting a shell, running commands, and viewing logs.

Jul 18, 2026 • 8 min read

How to Install Docker on Ubuntu 24.04

Install the latest Docker Engine on Ubuntu 24.04 from Docker's official repository, verify the service, and configure non-root access.

Jul 13, 2026 • 7 min read

Docker: List Running and Stopped Containers

Use docker container ls and docker ps to list running and stopped containers, print names and IDs, filter results, and check Docker Compose projects.

Terminal output showing running Docker containers with docker container ls

Jun 24, 2026 • 4 min read

How to Set Git Username and Email with git config

Set Git username and email with git config, both globally and per repository, check the current values, and update existing settings.

Jun 24, 2026 • 9 min read

GitHub CLI: Manage Repositories, Issues, and Pull Requests

Use GitHub CLI to create and clone repositories, manage pull requests and issues, inspect workflow runs, publish releases, and call the GitHub API.

GitHub CLI terminal card with gh command, pull request branch, and workflow check icons

Jun 19, 2026 • 5 min read

How to Add a Git Remote

Add a new remote to a Git repository with git remote add, then list, inspect, and push to it. Includes common errors and a git remote command reference.

Jun 15, 2026 • 5 min read

How to Undo Last Git Commit

Undo the last Git commit with git reset or git revert, and pick the right option to keep your changes, discard them, or safely undo a pushed commit.

Jun 14, 2026 • 6 min read

How to Setup a Git Server

Run your own private Git server over SSH on Linux. This guide covers installing Git, creating the git user, adding SSH keys, and pushing your first repository.

Jun 3, 2026 • 10 min read

Podman vs Docker: Differences and Migration Guide

This guide compares Podman and Docker across architecture, rootless containers, systemd integration, Compose workflows, image builds, and migration planning.

May 23, 2026 • 7 min read

How to Revert a Commit in Git

Use git revert to safely undo changes from a previous commit by adding a new commit that reverses them, without rewriting pushed history.

May 21, 2026 • 10 min read

Docker Networking: Connect Containers

Docker networking controls how containers communicate. This guide covers bridge, host, and none networks, port publishing, container DNS, isolation, and Compose networking.

Docker networking diagram connecting containers through bridge networks

May 5, 2026 • 7 min read

How to Install Docker on Debian 13 (Trixie)

Install Docker on Debian 13 from the official Docker repo. Set up the apt keyring, install Engine and Compose plugin, and fix common errors.

May 3, 2026 • 8 min read

.gitignore: Ignore Files and Folders in Git

Use .gitignore to ignore folders, files, logs, and build output in Git. See folder patterns, global rules, tracked-file cleanup, and debugging commands.

Apr 12, 2026 • 4 min read

How To Delete a Local and Remote Git Branch

Git branches pile up fast after merging. This guide shows you how to delete local and remote branches, clean up stale tracking references, and recover a branch you removed by mistake.

Apr 10, 2026 • 6 min read

Docker Run Command with Examples

Practical examples of docker run covering detached mode, port publishing, volumes, environment variables, restart policies, and interactive shells.