I run a Certificate Transparency monitor which retains a copy of all the certificates it downloads. As CT logs are append-only, the monitor’s disk usage keeps creeping upwards. I’m always on the look out for ways to optimize disk usage to delay the need to buy bigger disks!
tproxy is a feature in Linux which allows an intermediate router to run a proxy server which can intercept and modify network traffic transparently (i.e. the end systems cannot tell that this has been done, as the source/destination IP addresses in the packets are not modified.) tproxy also works with IPv6 whereas non-transparent mechanisms such as the iptables REDIRECT target do not because of the lack of NAT support in the Linux IPv6 stack in older kernels.
JetBrains’s IntelliJ IDEA uses a wrapper around the Java compiler,
named javac2, to provide additional support for compiling
produced by the IDE, and for processing
It is naturally supported inside IDEA itself, and also by Apache Ant.
However, other build systems like Gradle do not support it out of the
box. Supporting it is useful - e.g. if you wanted to run a continuous
integration server, which means you cannot use IDEA for building, and want it
to compile your forms. Also, it could be useful if other developers on the same
project used a different IDE.
Gradle is a relatively new Java build system, which mixes some of the ideas from Maven and Ant: the well-defined structure, multi-module support and dependency management from Maven, but also the customizability from Ant.
As well as being able to host Ruby applications with Rack, Phusion Passenger can also host Python applications with WSGI. This article shows how I set up Trac on Debian with nginx and Passenger.