Here I’m publishing DevOps-related technical manuals and notes. I’m writing articles aimed at junior DevOps engineers or those aspiring to become DevOps engineers.

How to use the git diff command. DevOps manual to compare changes in your code.

The git diff command is used to show the differences between various commits, the working directory, and the staging area in a Git…

Andrey Byhalenko

Mar 25

DevOps Example Project for your Resume. CI/CD for the Python service using GitHub Actions and AWS.

Create a CI/CD for the Python service using GitHub Actions and AWS.

Andrey Byhalenko

Mar 14

10 Quick Linux tips and tricks for DevOps💡: How to Make the Search Insensitive and Others.

Here is some quick tips for better work with Linux, used in my DevOps practice.

Andrey Byhalenko

Mar 2

Linux tip for DevOps💡: how to create a directory and move into it with one command.

In this short article, I will share with you the way you can create a directory and move into it with one command.

Andrey Byhalenko

Feb 20

What are What are RPO and RTO, and what is the difference between them? DevOps interview question.

Questions about RPO (Recovery Point Objective) and RTO (Recovery Time Objective) are often asked in DevOps and IT interviews.

Andrey Byhalenko

Feb 19

How to execute Docker commands without sudo in Ubuntu 22.04. Command line tutorial.

Let’s talk about the situation when a user wants to execute any Docker command in Ubuntu 22.04 but needs to do it with the prefix sudo and…

Andrey Byhalenko

Jan 31

What is NTP, why do you need it, and how to install/configure it? Guide for DevOps engineers.

Imagine you have several Ubuntu servers running different applications.

Andrey Byhalenko

Jan 29

Linux commands and tips from my DevOps engineering practical experience

In this article, I would like to share the Linux commands and tips I use often in my DevOps practice.

Andrey Byhalenko

Jan 28

How to Create New User and Group in Ubuntu 22.04 using the Command Line

In this article, I will show you how to create a new user and add it to a specific group using the command line.

Andrey Byhalenko

Jan 25

Linux tip for DevOps💡: what is Alias and how will it save you time?

In this article, I will explain what an alias is in Linux and why you should use it.

Andrey Byhalenko

Jan 20

Docker tip for DevOps💡: discover how much disk space Docker takes up on your system.

Want to know how much disk space Docker takes up on your system? In this short tutorial, I will show you how.

Andrey Byhalenko

Jan 18

Linux tip for DevOps💡: how to learn about any command fast without leaving the Linux command line.

In this article, I will show you three quick ways to learn about any Linux command.

Andrey Byhalenko

Jan 17

Linux tip for DevOps💡: how to learn Vim quickly.

Vim is a very powerful editor that has many commands—too many for any tutorial. Today I'll give you a tip on how to learn vim as quickly as…

Andrey Byhalenko

Jan 16

Linux tip for DevOps💡: how to quickly kill any process by it’s PID number.

Using this simple tip, you can kill any running process easily.

Andrey Byhalenko

Jan 15

What is Docker Compose and why do you need it as a DevOps engineer?

In this tutorial, I will show you examples of why you need it if you work with Docker.

Andrey Byhalenko

Jan 14

How to Install and Configure PostgreSQL on Ubuntu 20.04

In this tutorial, I will show how to install PostgreSQL from the apt repository and go over the basic configurations.

Andrey Byhalenko

Jan 12

How to solve “cannot kill Docker container — permission denied” error message

Solved: cannot kill Docker container—permission denied. The issue appears in the Ubuntu 22.04 Linux distribution.

Andrey Byhalenko

Jan 8

Useful Docker Commands That I Often Use in My DevOps Practice

In this short article, I collected Docker commands that I often use in my DevOps practice.

Andrey Byhalenko

Jan 7

How to run docker commands without sudo

In this article, I will use Ubuntu 22.04 to show you how to run Docker commands without sudo, but the process is the same in most Linux…

Andrey Byhalenko

Jan 6

How to Install Docker on Ubuntu 22.04

In this manual, I will explain, step by step, how to install Docker on Ubuntu 22.04.

Andrey Byhalenko

Jan 6

How to Install Nginx on MacOS

In this tutorial, you will learn how to install Nginx on a Mac using Homebrew.

Andrey Byhalenko

Jan 6

Fedora intends to merge the contents of the /usr/bin and /usr/sbin directories

The Fedora 40 release proposed merging the contents of the /usr/bin and /usr/sbin directories, replacing the /usr/sbin directory with a…

Andrey Byhalenko

Jan 2

How to Find Directories/Files That Take up the Most Disk Space in Linux: A Step-by-Step Tutorial

Let’s find out how to check disk space usage in Linux and how to find out what files use most of the disk space. I will use Ubuntu 22.04…

Andrey Byhalenko

Dec 26, 2023

Kube API Server: How It Communicates With Other Kubernetes Cluster Components?

As a part of Kubernetes Cluster Architecture, the Kubernetes API server validates and configures data for the API objects, which include…

Andrey Byhalenko

Nov 15, 2023

Jenkins Backup and Restore Using Plugins. Guide for Junior DevOps Engineers.

As a junior DevOps engineer, you know Jenkins is vital for CI/CD success. Yet, without proper backup and restore protocols, even the most…

Andrey Byhalenko

Nov 1, 2023

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