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Short Guides for IT Professionals

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Google Search Cheat Sheet

March 15, 2023 Zsolt Agoston
A list of the most useful Google search commands and operators ... Read More
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Show Error Details – PowerShell

December 27, 2022
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How to get verbose PowerShell error messages ... Read More
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How to Test Open Port in PowerShell

December 4, 2022
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Two ways to check open ports with PowerShell ... Read More
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Shadow Copies in Windows 10 and 11

October 14, 2022
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Set up automatic shadow copies on Windows 10 and 11 ... Read More
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Easy Password Generator in PowerShell

October 6, 2022
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Use PowerShell to generate randomized passwords in a length and count you want! ... Read More
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How to Set Primary SMTP in Exchange Online – M365

May 19, 2022
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Use the Set-Mailbox cmdlet with the -WindowsEmailAddress parameter to set the primary SMTP address in Exchange Online ... Read More
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Display Contents of SSL Certificate from PEM File

May 16, 2022
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A one-liner to display all contents of a SSL public key file ... Read More
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Convert OPENSSH key to RSA type

May 13, 2022
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Use ssh-keygen to convert an OPENSSH key to RSA format ... Read More
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Vim – Change Color Scheme for Easy Readability

April 22, 2022
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Set the 'desert' color scheme for Vim. easier on the eyes on dark backgrounds ... Read More
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SSH Private key Authentication to Linux on a Windows Machine

April 20, 2022
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Learn how to use private certificate files to automatically authenticate to SSH servers. No password needed! ... Read More
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How to Configure Static IP on Debian 10

April 15, 2022
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Configure a static IP address on a Debian 10 server using the command line ... Read More
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MySQL Query All Users and User Premissions

April 10, 2022
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List all the users and user permissions in a MySQL database using the shell ... Read More
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How to Securely Wipe a Disk in Windows 10 – No Extra Software Needed!

April 7, 2022
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I show you an easy way of wiping a disk using only built-in tools on a Windows computer ... Read More
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How to Compact a VHD or VHDX File using PowerShell

April 1, 2022
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These three simple commands will compact your vhd or vhdx file, removing the whitespace inside ... Read More
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How to Add a Thin-Provisioned Disk in Proxmox

March 29, 2022
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Learn how to convert a qcow2 disk file to thin-provisioned type ... Read More
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Proxmox Update Unauthorized Issue Fix

March 27, 2022
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A quick tip on how to fix the Failed to fetch, unathorized error in Proxmox when trying to update the system ... Read More
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How to Add Extra Storage to Proxmox

March 23, 2022
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Step by step guide shows how to add new storage disks to an existing Proxmox installation ... Read More
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Exercise: Set up 10 new VLANs on the pfSense LAN interface

March 15, 2022
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Today's task is to set up ten new VLANs on a virtual pfSense router with separate, routable subnets. DHCP should service each subnets and both virtual achines and physical nodes should be able to use them. Let's see how to ... Read More
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How to set localhost IPv4 instead of IPv6

March 13, 2022
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Learn how to make the IPv4 address the preferred address on your Windows hosts ... Read More
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How to Set Up VLANs on Proxmox

March 10, 2022
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This is the second part of our series about how to set up a home IT lab. The first part was about configuring a Proxmox hypervisor on an old machine. This part shows you how to set up VLANs for ... Read More
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How to Remove Proxmox License Warning

March 7, 2022
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This guide shows you how to remove the pesky 'No valid subscription' warning from your Proxmox portal ... Read More
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