June 11, 2019    Tags: raspberrypi  unix  pi  debian  tracker  advertisement  pi-hole


Online advertisment is everywhere. I don't like webpages where everywhere something pops up or overlays content or you can't really see any content because of the advertisment. On my browsers I like using plugins like AdBlock, uBlock Origin and NoScript. But what can I do on my smartphone inside the Apps or on my Smart-TV?

Yubikey two factor authentication for ssh

March 8, 2019    Tags: yubikey  2fa  ssh  yubico


After my successfull sudo test I was interested in 2fa for ssh. As a systemadministrator you are always scared about secure login just for you/your team.

Also ssh 2fa via yubikey is pretty straight forward. It needs some more work than just the sudo case but here we go.

Yubikey for sudo 2 Factor Auth

Dec. 7, 2018    Tags: yubikey  2fa


Some days ago I thought about testing two factor authentication (2FA) with Yubikey. Yubikey is a hardware security key which can do a lot.

How to test 2FA on a local machine if you don’t want to log you out or destroy anything important? I decided to implement 2FA for sudo command with yubikeys U2F feature. Be aware: This does not work for ssh.

handle kvm static ip adresses

Nov. 27, 2018    Tags: virsh  kvm

I did a lot of work with libvirt and kvm and for some hosts I wanted to have a fixed IP address but not configured on the host itself. I wanted to get it from dhcp.

Minikube increase disk size

Sept. 10, 2018    Tags: minikube  docker  testing  kubernetes


I did some more research and development with kubernetes and minikube. During some tests where the diskspace of one node got bigger than 16GB and I saw a message about DiskPressure in the logs, I figured out that minikube has a default disksize of something around 16GB.