Category: Blog

Advanced Tutorials Blog Debian
10. February 2022

Configure Postfix MTA as Send-Only on Debian 10 / 11

In this guide we’ll look at how you can configure Postfix MTA as a send-only SMTP server on Debian 10/11, meaning it doesn’t receive and process emails. Its job is only to act as Local mail transfer agent. Postfix is a popular open source Mail Transfer Agent (MTA) used in Linux and Unix environments. A send only mail server is useful especially when used in scripting, […]

Advanced Tutorials Blog Rocky Linux
28. January 2022

How to install and configure Pritunl VPN server on CentOS Stream 8

Pritunl VPN is one of the most secure open source VPN tools that are currently available for multi-cloud VPN peering. Pritunl VPN server uses MongoDB and can be deployed on any cloud infrastructure. Pritunl VPN Server supports OpenVPN and Wireguard. The VPN operates in a server-client architecture in such a way that the clients connect to the remote VPN server and routing is handled by […]

Blog VMware
27. January 2022

How to change E1000 into VMXNET3 vNIC on a Windows VM

No matter what the situation, there may be a requirement to change the vNIC of a VM from E1000 to VMXNET3. In my case I have changed my whole network infrastructure to 10 Gbit, Linux VMs are easy to migrate but Windows VMs are a little bit problematic, so I want to show you with this example how it works. Using the VMXNET Generation 3 (VMXNET3) […]

Blog Home Lab
25. January 2022

BIG DISASTER @ irgNET Datacenter

Well I think the title is telling a lot. Unfortunately, in my main server the RAID 5 array has drifted apart due to 2 defective HDDs. First I got the information from iLO Advanced, the OnBoard Management solution of HPE, that one hard disk failed. Then I went to Datacenter 01 and exchanged the defective disk for a new one. During the rebuild, another disk […]

Blog HPE
21. January 2022

How to Update HPE NC550SFP 2.x Firmware

For the next Home Lab update, I decided to increase my network infrastructure to 10Gbit. For this, I picked out VMware 7.0 U3 compatible HPE NC550SFP CNAs for a small amount of money. However, these were at a firmware level beyond the Stone Age and were not recognized by either the HPE DL380p Gen8 or ML310e Gen8 v2 and I had no link. So I […]

Basic Tutorials Blog
20. January 2022

How to Check a file with MD5 or SHA-256 Checksum on Windows

When downloading files for patching or drivers you may need to verify the file is complete.  This can be done by verifying the MD5 checksum from the steps below on your PC. 1. Open the Windows command line. Press Windows + R, type cmd and press Enter. 2. Go to the folder that contains the file whose MD5 checksum you want to check and verify. Command: […]

Blog VMware
18. January 2022

VMware ESXi 6.7 Upgrade to 7.0 (and 8.0) – Missing dependencies VIBs Error

In this project we had a stack consisting of 3 individual VMware ESXi 5.5 servers. These are the Cisco UCS C240M4S2 model with Intel XEON v3 CPUs. As mentioned earlier, 09/18/2020 was considered End of Support for ESXi 5.5 and so most are now forced to update their environments to the latest version. First we check via VMware Compatibility Guide if the hardware component, BIOS […]

Advanced Tutorials Blog
17. January 2022

UniFi Network – How to Install and Update via APT on Debian or Ubuntu

Welcome to a short tutorial on how to keep your Unifi controllers up to date. Please do not forget to make a backup of your Unifi machine before each update. If you don’t have root rights you have to use sudo for every command! 1. Install required packages before you begin with the following command: 2. Use the following command to add a new source list: 3. Add […]

Blog VMware
13. January 2022

How to export an ESXi 5.5 VM for Restore

In case you don’t have a backup solution in your home labs but also surprisingly in your company. I would like to show you a backup variant for your VMs. Please note that a backup is necessary in the home lab as well as in the company for long-term data consistency. This is by no means a professional backup solution but intended for the case […]

Blog VMware
6. December 2021

Home Lab Nomination by VMware vSAN

On Saturday my Home Lab was nominated by VMware vSAN and posted on their twitter page, something like that makes you proud after all. BIG THANKS to VMware 🙂 That’s just the beginning of a great Adventure.