Technical notes, my online memory

I often want to change a class attribute in a unit test. While it is sort of documented in the official documentation , it's missing an ...

This snippet will download openssl and verify the hash against a hard-coded value. This is useful on old operating systems (specifically Cen...

RedHat has long had an insane requiretty default for sudo , something that is fixed in later versions. Packer rightly doesn't set a tty ...

Intended as a living document, just some basics for now. Build from the Dockerfile in the current directory and tag the image as "dem...

Docker and Vagrant are somewhat similar technologies, so what are their relative strengths and weaknesses and when should you choose one ove...

Docker picks an address range for the docker0 range that it thinks is unused. Sometimes it makes a bad choice. The docs tell you that this c...

The *nix command 'time' is very useful for timing how long commands take. To do the same with the windows command line you have two...