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DevOps Manuals and Technical Notes
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.
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How to use the git diff command. DevOps manual to compare changes in your code.
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.
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.
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.
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.
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.
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.
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
Linux commands and tips from my DevOps engineering practical experience
In this article, I would like to share the 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
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?
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.
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.
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.
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.
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?
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
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
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
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
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
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
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
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
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?
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.
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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