yannick Coffi

Founder of SNUBmonkey™ and ocularfuel.com. Linux SysAdmin and Network Security Engineer focused on hardened systems, automation, and high availability. UX/UI Designer and Photographer sharing practical Linux insights.

linux 🐧

APT vs Snap: What the, what the hell ...

In Linux, package managers are software tools that assist users in searching, downloading, installing, removing, and updating software packages on their system and can be accessed by either Command-Line or through a Graphical User Interface application. There is a variety of package managers to choose from, including dpkg (Debian Package

linux 🐧

Mail Terminology.

Client and server components There are different components involved in an email transmission from sender to recipient. MUA (Mail User Agent) Client application that allows receiving and sending emails. It can be a desktop application such as Microsoft Outlook/Thunderbird/… or web-based such as Gmail/Hotmail/… (the latter is also

how to 🪄

How to install Fing on Ubuntu Debian Servers.

The Fing Command Line Interface (Fing CLI) is a standalone program that provides a set of very handy network troubleshooting tools (NIC information, scan, ping, traceroute, and so on). Installation The software has been packed using Debian (DPKG) and Read Hat (RPM) package manager. Below is the Architecture supported: • i686

tips

How to Remove/ Disable Zsh History' Commands on Linux.

This is the ninth in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

how to 🪄

Using the SSH Client Config File ~/.ssh/config.

Imagine you have to regularly connect to +15 remote systems over SSH. That means to remember all of the remote IP addresses, different usernames, non-standard ports, what authentication keys to use, and various command-line. Quite a big waste of time. Fortunately, SSH allows you to generate a config file that

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issues 🛠

Issue : “Gmail Authentication failed. Please check your username/password” Error. Also known as the “Server response: 534-5.7.14 Error”

how to 🪄

SSH Key-Based Authentication & how to SSH *Without a Password.

So how do you remotely connect to a Linux system? There are multiple available tools out there for remote logins but when it comes to Linux, SSH is the unicorn choice. The Secure Shell (SSH) is a protocol that /provides a secure encrypted connection between two hosts over an insecure

tips

Port xxxx-already-in-use-error- Fixed! 🛠

This is the eighth in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

linux 🐧

SYN-SYN-ACK and ACK 🤝

Understanding TCP Flags TCP flags are used to indicate a particular state during a TCP conversation. TCP flags can be used for troubleshooting purposes or to control how a particular connection is handled. Each of them has its own significance. They initiate connections, carry data, and tear down connections. Commonly

tips

Monitoring Web server logs (Apache, NGINX) with Netdata using Go. (Update !!!)

This is the seventh in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

terminal

49 Most-Used Linux Commands You Should Know.

The Linux command line is a text-based computer interface. It's also known as the Shell, Terminal, Console, CLI, or Prompt, just to name a few. Any graphical user interface (GUI) is nothing more than a graphical representation of command-line applications.

issues 🛠

Issue installing apache2 in Ubuntu 22.04: dpkg:- error processing package javascript-common (--configure):

When files in a package are modified or accidentally removed, it can damage the system. Installing the package again resolves the problem in most cases. However, using the apt install command will return an error, given that the package is already present. Here’s the error: $ sudo apt install apache2

how to 🪄

How to: Use Postfix to Outbound Email as Gmail Relay on Ubuntu - 2-step verification (Update !!!)

Postfix is a mail transfer agent (MTA) a software that implements Simple Mail Transfer Protocol (SMTP). They transport E-Mail messages from one computer to another. MTAs talk to other MTAs, and either * deliver mail locally * or hand it off for delivery to an mail delivery agent (MDA)/LDA if it

how to 🪄

Upgrade from Ubuntu 20.04 LTS to 22.04 LTS Server

Ubuntu 22.04 is a Long-Term Support (LTS) release and will receive ongoing app updates and critical security fixes for the next five years. New Linux kernel releases and graphics driver updates are also rolled out as software updates every six months or so. Ubuntu 22.04 brings a ton

ghost

Ghost 5+ -- How to Migrate From MariaDB 10.x to MySQL 8.x

This is the sixth in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

security 🦾🦿

Is 256-bit SSL Encryption any Safe?

SSL certificates enable encrypted connections between a client and a web server via the transport layer security (TLS) protocol. Nobody can intercept a message while it’s being transmitted over an encrypted connection. Again, it does not protect your website from getting hacked.

how to 🪄

Build and Install htop 3 on Ubuntu.

Htop is a command-line utility that allows you to interactively monitor your running system’s vital resources processes in real-time which are currently managed by the Linux Kernel. It's a little bit like its counterpart 'top' but on steroids.

how to 🪄

Managing Users.

Linux is a multi-user operating system, which means that several users can interact the system at the same time. As a system administrator, you are in charge of managing the system's users and groups, which includes adding and deleting users and assigning them to various groups.

security 🦾🦿

User authentication process.

Have you ever asked yourself how the user authentication process works? Let's jump. What is User Authentication? User authentication is a security process that covers all of the human-to-computer interactions that require the user to register and log in. Simply said, authentication asks each user: 'who the

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tips

How to Remotely Reboot your Server.

linux 🐧

The Differences between Sudo and Su in Linux: A Beginner’s Guide.

Confused about when to use su versus sudo? This tutorial will clarify the differences between the two commands, explain when each is appropriate, and guide you on how to use them effectively for better system management and security.

tips

Why do some lines in the SHELL' history end with "*"

This is the first in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

how to 🪄

Using Monit to Monitor Linux Daemon, CPU, Filesystem, Network and Files on Ubuntu Server.

Services on any server must be operational and perform their duties effectively. It is critical to monitor the overall state of your server, including processes, programs, directories, files, and so on. This is known as system monitoring.

how to 🪄

Running commands over SSH.

Have you ever wanted to send a command or a script to a remote computer without ever actually logging in to the shell? - well, SSH (Secure Shell) is your friend. Let's say you would like to check your server process activity by using the "top"

how to 🪄

v2.wttr.in: Your Weather Forecast right in your Terminal.

v2.wttr.in is a console-oriented weather forecast service that supports various information representation methods like terminal-oriented ANSI-sequences for