Linux - net4VISIONS Blog

net4VISIONS Blog

Linux

Als Linux oder GNU/Linux bezeichnet man in der Regel freie, unix-ähnliche Mehrbenutzer-Betriebssysteme, die auf dem Linux-Kernel und wesentlich auf GNU-Software basieren. Die weite, auch kommerzielle Verbreitung wurde ab 1992 durch die Lizenzierung des Linux-Kernels unter der freien Lizenz GPL ermöglicht.

DNS OPENPGPKEY Shell Oneliner with GnuPG

DNS OPENPGPKEY Shell Oneliner with GnuPG

To generate the DNS Zone entries for your OpenPGP/GnuPGP (GPG) public keys, you can use this shell script: domains="example.com google.com" for at in $domains ; do gpg -K | grep "$at" | sed 's/^.*<\(.*\)@.*>$/\1/' |\ while read n ; do echo "

Howdy - Face authentication for Linux

Howdy - Face authentication for Linux

A few days ago I've added a little bit of OpenCV-based Artificial Intelligence to my Linux laptop. I've been wondering about the password prompt and ever and ever typing in this password after resume from sleep. But auto-login without password doesn't seem to be

Use container healthcheck for security

Use container healthcheck for security

Docker containers provide the healthcheck feature, which can be scripted individually for every container. The official use case is to check if the service(s) is/are responding and working correctly in the container. But it is also important that your container is secure. It is never a good idea

Enable SSL/TLS in amavis for secure connections

Enable SSL/TLS in amavis for secure connections

If you have a multi-host email server setup or you won't trust all admin users, you should connect the TCP sockets of amavis encrypted with TLS. Or else people could sniff the email content transmitted from/to SMTP server to/from Amavis over the network. Amavis needs some

Create docker image from scratch

What is this about Docker Docker is a Platform-as-a-Service (PaaS) solution to run all kinds of applications in isolated containers. More information is available at https://www.docker.com/community-edition. Docker images Docker stores application data in so called images. These images provide the full runtime environment to execute the

XFCE Tumbler patch

XFCE Tumbler patch

I'm using XFCE Desktop as my working/development environment. It is fast and has all features I need. Allmost... There is a thumbnail service called Tumbler which creates these neat thumbnail icons for image and pdf files and some more files with viewable content. To create these thumbnails

Die POSIX Variante von which

Die POSIX Variante von which

In Shell Scripts muss man immer mal feststellen wo ein Executable zu finden ist. Dazu kann man einmal das Utility which <exe> verwenden. Dazu muss das aber auch installiert sein. Auf der noch sicheren Seite ist man, bei Verwendung einer POSIX-kompatiblen Umgebung, mit dem Aufruf von command -v