Packet filtering is essential for network security and Linux offers this out of the box. There are different possibilities like iptables, nftables or firewalld, and a basic understanding of these is very useful.
Posted July 9, 2021 by Adrian Wyssmann ‐ 8 min read
Writing technical blogs often requires to do screenshot, where you may also want to highlight stuff of even obsfucate sensitive data.
Posted May 5, 2021 by Adrian Wyssmann ‐ 2 min read
If you are running a bare-metal cluster you probably run kubernetes on top of some linux os, these systems have to be regularly updated. But an update means sometimes that you have to reboot your servers. This also means during a reboot that particular node is node available to schedule workload.
Posted April 20, 2021 by Adrian Wyssmann ‐ 6 min read
When you manage Linux systems it's usually pretty clear how to reboot a system. But do you know how to check whether a system requires a reboot? Cause you don't want to reboot a system if it is not necessary
Posted April 20, 2021 by Adrian Wyssmann ‐ 2 min read
My son has a Surface Go Tablet which suddenly stopped booting. Even after trying to uninstall patches etc. I could not bring it back, so I decided to help him to get the data from the tablet, so he can use it.
Posted March 13, 2021 by Adrian Wyssmann ‐ 3 min read
Unattended installation is the possibility to install an operating system without human interaction. Principally it is the same for Windows and Linux: An "answer file" which describes the configuration is provided as an input for the installer. These "answer files" provide any kind of setup options including how to partition disks and what packages/features to install.
Posted April 12, 2017 by Adrian Wyssmann ‐ 4 min read
Posted November 29, 2016 by Adrian Wyssmann ‐ 1 min read