Parandrus

Using device mapper we can use a layered approach to share common filesystem parts across VMs and provide a copy-on-write layer for each VM.

What are zombie processes, where do they come from and how do we get rid of them?

Testing modules that interact with the filesystem can be tricky. Typically you mock indivdual methods of the `fs` module, but his can be a bit tedious if you have to mock a lot of different calls.

The parandrus or tarandos was an animal from medieval bestiaries. They were ox-sized, long-haired, with antlers and cloven hooves, but could change the colour of their fur to obtain camouflage.

This post shows how to write a logging middleware for HTTP handlers that can log the status code of the response.