Articles by Tag #sysadmin
Browse our collection of articles on various topics related to IT technologies. Dive in and explore something new!
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...
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.
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.
Linux Reboot Commands Explained: A Practical Guide
Knowing how to properly reboot a Linux system is a critical part of system administration and...
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...
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.
System Performance Monitoring
Table of Contents Why Monitoring Matters What to Monitor (Key Performance Metrics) 1....
🛡️ 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.
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.
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...
Top Tools and Applications That Support SOCKS5 Proxies
Meta Description: Explore popular tools and applications that support SOCKS5 proxies, including...
sysadmin.ca – Free tools & IT policy templates for sysadmins
I built a free hub of daily tools & IT policy templates for sysadmins – no login, no...
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...
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.
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.
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...
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...
Basic Linux Syntax Frequently Used by Writer
Hallo world! Postingan ini akan membahas beberapa syntax dasar yg sering penulis gunakan. Post ini...
How to Clone a Local Git Repository to Internal Directory in Same Server?
In many DevOps workflows, you’ll often need to clone a local Git repository into a specific directory...
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...
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...
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.
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.
Lab Setup: Using SOCKS Proxies, ProxyChains, and SSH Dynamic Port Forwarding
Meta Description: Step-by-step SOCKS proxy lab setup with SSH dynamic port forwarding, ProxyChains...
Proxy Chaining Explained: Using ProxyChains for Stealth and Pivoting in Pen-Testing
Meta Description: Understand proxy chaining and learn how ProxyChains routes traffic through multiple...
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.
Real-World SOCKS Proxy Use Cases for Cybersecurity and Network Administration
Meta Description: Discover real-world SOCKS proxy use cases, from penetration testing pivots to...
Landing From Clouds: Why On-Premise Will Eventually Win... In a Large Number of Cases
Update: Well, folks, I edited the title. No one spoke so categorically. Clouds will remain in their...