If you are building a script, application or anything else that collects measurements or data over time intervals, a time-series database might be a good match for you. In a TSDB you simply store the data and read it back for analysis. For these use cases, there is no need for updates or changes to the data as it’s time-based. The data can’t change back in the past. InfluxDB is the most popular of these time-series databases and this article describes how to get started with it, on Debian or Ubuntu, and how to use it from Python.Continue reading
Category Archives: Ubuntu
Cross compiling for arm or aarch64 on Debian or Ubuntu
ARM is gaining more and more traction and is growing a lot in popularity. It’s not always possible to build directly on these ARM-based devices, especially when they are limited in resources. The majority of build and developer machines are still on x86 and by using cross compiling, it is possible to build binaries or executables usable on another architecture. For example, to use your standard PC, most likely x86, to build something that is usable on another machine or device that’s on another architecture, like ARM. In this post, I’ll explain how to do cross compiling for 32bit ARM (arm) or 64bit ARM (aarch64) using Debian 10 or Ubuntu 20.04 LTS.Continue reading
Forward a TCP port to another IP or port using NAT with nftables
Besides using NAT for accessing the internet with multiple machines using a single IP address, there are many other uses of NAT. One of them is to forward all traffic that is sent to a certain TCP port to another host. In practice, this technique can be used to test a service on a new host without adjusting anything on the client. The users or the clients do not need to be pointed to a new machine in order to test it. When the test would be unsuccessful, removing the NAT-rule is all it takes to switch back.Continue reading
Cross compiling for ARM with Ubuntu 16.04 LTS
The goal of cross compiling is to compile for one architecture on machine running another one. In this post, I’ll try to explain the steps required to be able to compile software that is executable on ARM-based hardware using a “normal” x64-based PC or virtual machine. ARM-based devices are usually limited in processing power and are mostly running stripped-down, embedded versions of Linux. This makes it sometimes difficult to compile on the target device directly.