Articles by Tag #sysadmin
Browse our collection of articles on various topics related to IT technologies. Dive in and explore something new!
Configure SSH Login from Windows to Windows
A step-by-step guide to setting up SSH login from one Windows machine to another for secure remote access.
Creating and Managing Custom systemd Services on Ubuntu
Introduction If you've ever needed to automate an application or script to run on boot or...
SSH Authentication Key Rotation: Why and How to Expire SSH Keys
Learn how to implement SSH key expiration and rotation using AuthorizedKeysCommand for better security hygiene on Linux servers.
🛡️ Complete Guide to Fail2Ban: Protect Your SSH Server from Brute Force Attacks
Learn how to secure your SSH servers against brute force attacks using Fail2Ban. Step-by-step setup, testing scripts, and advanced hardening tips included.
Managing NixOS on DigitalOcean with Colmena
In this post, we will prepare a DigitalOcean image for NixOS, launch a droplet with it and manage it...
System Performance Monitoring
Table of Contents Why Monitoring Matters What to Monitor (Key Performance Metrics) 1....
10 Bash Commands Every Sysadmin Should Know
Introduction As a system administrator, mastering Bash commands is essential for managing,...
Understanding Networking Commands - Why They Matter
It’s not about being perfect. It’s about understanding what you’re doing. It’s been a minute since...
Configure SSH Passwordless Login from Windows to Linux
A step-by-step guide to setting up SSH passwordless login from a Windows machine to a Linux server for seamless and secure connectivity.
How to Set the Hostname on a Linux System
Learn how to set, update, and manage hostnames on Linux systems using the powerful `hostnamectl` command.
How to make easy encrypted backups with rclone for free
Rclone supports tons of different storage backends. I like to use R2 on Cloudflare with their...
How to Recover from Expired vCenter 7 (ESXI) Certificates: A Step-by-Step Guide 2025
"Recently I encountered a situation where vCenter 7's certificates had expired, causing...
DKIM, DMARC und SPF: Der Schutzschild deiner E-Mail-Kommunikation 🛡️
Schütze deine E-Mail-Kommunikation! Erfahre, wie DKIM, DMARC und SPF vor Spoofing und Phishing...
A simple tool for automated MySQL database dumps and restores
Hey everyone! 👋 I’ve recently built a Rust-based tool called DumpSync that allows for automatic...
Limiting SSH Access with TCP Wrappers, AllowUsers, and IP Restrictions
Learn how to secure SSH access on your Linux servers using TCP Wrappers, AllowUsers, AllowGroups, and IP restrictions. Step-by-step examples included for locking down your environment and preventing unauthorized access.
Group Management in Linux: The First Step to Becoming a Sysadmin
If you’re thinking about becoming a Linux system administrator, one of the first things you need to...
Basic Linux Syntax Frequently Used by Writer
Hallo world! Postingan ini akan membahas beberapa syntax dasar yg sering penulis gunakan. Post ini...
Running Linux in QEMU: How to Build a VM from an ISO
Learn how to create and boot a Linux virtual machine using QEMU and an ISO file, with support for x86 and PowerPC architectures. Perfect for portable testing environments.
The Unsung Heroes of the AI Age: Sysadmins, Our Digital Guardians
Ah, the age of AI! Where machines are almost as smart as your Aunt Margaret who insists she can still...
Creating users and groups from a file with bash.
As a devops engineer creating users and managing them is one of the primary responsibilities as a...
Linux Communication Commands Every System Administrator Should Know: `users`, `write`, and `wall`
Table of Contents 1. users – Who’s Logged In? 2. write – Sending Private Messages to...
🔐 How to Set Up Multi-Factor Authentication (MFA) on Ubuntu for SSH
Secure your Linux servers with this easy guide on setting up Multi-Factor Authentication (MFA) for SSH on Ubuntu 24.04 using Google Authenticator.
Secure SSH Access with Modular Policy Files
Learn how to harden your SSH server using modular configuration files and reusable security policies. Improve manageability, mitigate vulnerabilities, and enforce best practices.
How to Use QEMU to Run Linux VMs in Minutes
Learn how to quickly spin up Kali Linux and Fedora Server virtual machines using QEMU with real-world examples and command explanations.
DKIM, DMARC and SPF: The protective shield for your email communication 🛡️
Protect your email communication! Find out how DKIM, DMARC and SPF protect against spoofing and...
Make Cronjob Script With Log
Postingan ini hanyalah catatan untuk penulis. Ini adalah script cronjob yg dibuat untuk membuat log...
QEMU: Lightweight Virtualization for the Command Line Enthusiast
Discover how QEMU, a powerful CLI-based hypervisor, makes it easy to spin up VMs for quick testing and development across platforms—even on laptops.
Windows Server 2025 Data Center (16 Core): The Next Generation of Enterprise Server OS
Microsoft has announced Windows Server 2025, the next evolution of its powerful server operating...
❓ Do you allow wrong input to enter your function?
✋ Then stop, PowerShell can help you validate your parameters. The first picture shows how to...
Automating User and Group Management Using Bash Script
Bash, short for Bourne Again Shell, is a Unix shell and command language that has been a fundamental...