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Fun with Linux

Route to nowhere - Blocking attackers using Nullroutes

If someone attacks a linux-system, most administrator would block the ip-address of the attacker using iptables-rules. But there is another method to block the address of an attacker: nullroutes. A Nullroute simply directs to nowhere.

Monitoring memcached

memcachetop is a nice perl-script for displaying live stats from memcached. The author kept portability in mind, so it has not much dependencies and might run on many systems.

Using the mouse-wheel to scroll in GNU screen

For scrolling with the mouse-wheel in GNU screen, the following line is needed in ~/.screenrc:


termcapinfo xterm*|rxvt*|kterm*|Eterm* ti@:te@

reptyr - A tool for "re-ptying" programs

It happens so often that when I start a copy-job remotely, I just realize that I forgot to start it in GNU screen. Sometimes I can just stop the job and start it again in screen, but very often stopping the job might be problematically. There is a nice tool called reptyr which can re-ptying your jobs.

This blog is now equipped with a fulltextsearch

The search-engine of this blog bothered me for a while. That's why I implemented a fulltext-search. I hope it is easier now to find the right content.

Let's Encrypt

Letsenrypt

Lets Encrypt was lately quite often in the media. Letsencrypt is a very easy to use tool which provides certificates for free. Those certificates are valid on most common browsers. I never understood why certificates are expensive that's why I tried out letsencrypt(and I like it!). In this article, I will replace all cacert-certificates on a kolab-server. Therefore I will install the letsencrypt-certificate on: apache2, cyrus-imapd and postfix.

Phoning home - In a nice way

I own one host with a dynamic ip and I'am using dyndns to find this host. But from time to time the dyndns-provider changes it's fingerprint and this host is unable to propergate it's ip. In such situations I am unable to connect since I don't know the current ip. I could change the dyndns-provider and just get a stable one, but i don't wanna lose the domainname and it just happens from time to time. So I want to find out the new ip of my host even if dyndns fails.

the fuck: Magnificent app which corrects your previous console command

the fuck programm

Magnificent app which corrects your previous console command, inspired by a @liamosaur tweet.

Git: Using Git for building the Linux-Kernel from sources

Git was invented by Linus Thorvalds for managing the Linux-kernel-sources. So it's pretty clear that it is the best tool for managing our own kernel-builds too. I love to use Docker. That's why I also need the AUFS-Support which is not included in the Linux-Tree. Git can also help us to easily include external kernel-patches. In this article I will clone the linux tree and create an own branch with my prefered kernel-version(and my customized kernel-config). I will pull the AUFS-Patches directly into this branch and compile this kernel afterwards.

Preparing video's for the web(using ffmpeg)

Convert video to different formats:

Mp4 (H.264 / ACC):

ffmpeg -i INPUTFILE -b 1500k -vcodec libx264 -vpre slow -vpre baseline -g 30 "OUTPUTFILE.mp4

Webm (VP8 / Vorbis):

ffmpeg -i "INPUTFILE"  -b 1500k -vcodec libvpx -acodec libvorbis -ab 160000 -f webm -g 30 "OUTPUTFILE.webm"

Ogv (Theora / Vorbis):

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