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Category linux

proxmox Serverhardening: Part 2 – fail2ban

Part 2 – fail2ban on a proxmox host Part 1 was about the insecure service (rpc) which is rolled out in the default proxmox installation. You can find the article here. In this article we want to further secure our… Continue Reading →

KASM Workspaces – Install on rocky linux

In a video from networkchuck, he introduced kasm workspaces. A tool or more like a webservice you can host (wherever you want) to start encapsulated (kind of more secure) desktop environments or apps in a docker container, that will be… Continue Reading →

proxmox Serverhardening: Part 1 – rpc

In an absolute buying frenzy I rented a new server for my web services, gaming servers and so on. It was immediately clear that I again throw a proxmox hypervisor on it and since the new server is so potent,… Continue Reading →

Using HP Printer Color Laser MFP 17x Series under Archlinux

I bought a HP Printer Color Laser MFP 178nwg for my homeoffice in my new home. Using it under windows is not a problem. You just need to install the HP-Tools and then it should work. But on (arch/manjaro) linux… Continue Reading →

Zabbix sizing

Article updated on: 05.01.2022 Zabbix, a very comprehensive monitoring system, which is a very nice alternative to the well-known monitoring systems Cacti and Nagios. In addition to extensive existing templates, it also offers a very high level of customisability and… Continue Reading →

CentOS / RHEL: Changing the PHP version

I was just allowed to update the PHP version on a web server and would like to share the procedure with you here. With this procedure, I was able to carry out an update within the 7.x releases without any… Continue Reading →

HowTo: Hardening the Webserver – HTTP Header

I recently wrote a Flask web application in Python. When I put it online, I of course ran Nikto over it. Since I was immediately confronted with the usual suspects, I wanted to write down the solution for this weak… Continue Reading →

MATRIX Calls – Host your own collaborationplatform

MATRIX calls… …from behind the NAT. Can you hear it? What (are you smoking)? Haven’t you heard? In the ocean of FOSS tools and VoIP clients that is out there, fighting for dominance, especially in times of COVID, it can… Continue Reading →

Zammad and the “SearchIndexAssociationsJob”.

I would like to briefly tell you about a small and quickly solvable problem that hit me in my daily work environment. Recently I updated a server including the Zammad1 installation and prombt got some errors displayed. Error messages Failed… Continue Reading →

Create and share passwords on the fly! Secure!

Dealing with passwords in general Passwords, a necessary evil and often the only protection against access to one’s own identity (facebook) or other services. But now it happens that we administrators sometimes have to exchange passwords and usernames. Often also… Continue Reading →

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