Most of our web applications run in LXD containers. Not without reason LXD is one of the most important features of Ubuntu Server for me. There are many ways to access a web application in an LXD container from outside. For example, you can use a reverse proxy to control Read more…
We regularly measure particulate matter in the air at our school. Particularly between February and May the values here in South-East Asia are very high, because it hardly rains during this time, it is very dry and hot and many meadows and fields are burned down. All this has a Read more…
Baseline Setting up a computer lab can quickly become very expensive. Computers, monitors, keyboards, cables, switches, etc. need to be purchased in order to have a reliable computer room that is often used later on. Especially small schools and clubs, which only have small budgets, are barely or poorly equipped Read more…
At our school we use Citrix Hypervisor (formerly XenServer) (soon xcp-ng) to virtualize our school server and other applications. Citrix provides XenCenter, a management tool for Windows. With it you can easily manage all virtual machines and make settings on the Citrix Hypervisor. Another possibility is Xen Orchestra. It is Read more…
At our school there are always power outages. Sometimes they last only a few seconds, sometimes several hours. To ensure that our IT infrastructure does not suffer from this, we have installed a UPS for our servers and network devices. These help to bridge short power outages (up to 1 Read more…
Our core infrastructure at the school is secured with a UPS. Unfortunately we always have power failures (mostly short ones) and with the help of our UPS we can at least bridge them a little. On our UPS hangs a Raspberry Pi, which is configured as a NUT server. If Read more…
About a year ago I wrote about how to measure the air quality with a Raspberry Pi and a cheap sensor. Make sure to read that article first! We’ve been using this setup in our school and privately for a few years now. However, this project has one disadvantage: it Read more…
For the monitoring of our network infrastructure we use Check_MK. Check_MK supports a variety of services and agents. Data can be monitored with the Check_MK agent, SNMP or simply by ping. In the past, we used to monitor our firewall via SNMP, which is already integrated in pfSense (You can Read more…
pfSense has a completely redesigned user interface since several versions (checkout our install guide). All settings can be easily reached and adjusted with this interface. The freely configurable dashboard is also a fine thing. However, there is sometimes the case that you would like to make settings via an API Read more…
PfSense is an open source firewall solution that can be used at home, at school or in a company (see our install guide with hardware recommendations). In most cases you don’t want to connect clients exclusively via network cable, but also wirelessly. The easiest way is to connect a WLAN Read more…