Recently I got a tip about subsequent adding of port forwardings to SSH Sessions without logout/login. As I work a lot with cloud technology and therefore use openssh very frequently, I found this very handy and use it several times a day.
Continue reading

After I’ve started my CoreOS cluster, I demonstrate how to run a sample service on it. In this case a Tomcat 8 Docker container controlled by fleet.
Continue reading

After I’ve set up my DigitalOcean environment, I show how to launch a CoreOS cluster on it. To remain as relevant to productive experience as possible, I decided to run a Testing Cluster as described in the CoreOS documentation.
Continue reading

While I’m currently familiarizing myself with CoreOS and Docker, I thought it would be nice to try DigitalOcean as a hosting provider for this, because of the publicity that is made for them. So let me share my experience…
Continue reading

Finally I found out, how to rebind reverse-history-search from Esc + / to Ctrl + R in ksh.
Continue reading

I have a small home server setup which has its port forwarded to the internet router. Recently I inspected my sshd logfiles and found a way too much brute force attacks against my ssh daemon. I searched for a solution to protect against that and stumbled upon knockd.
Continue reading

Recently I discovered how to use multidimensional hashes in Korn Shell. Here are some short code sniplets which show how they work.
Continue reading

Recently I had a corrupt audio-stream in one of my videos. So, there was the need to extract the video-stream from a mp4 container and combine it with a fixed audio stream. Here are the ffmpeg commands I used for that - maybe someone needs them too.
Continue reading