Containers are a hot topic. The technology, which has been most typified by Docker, enables applications to be deployed as a lightweight set of processes rather than an entire virtual machine (VM).

The idea of running applications within containers – also known as operating system (OS) level virtualisation – is not . The origins of the technology can be traced back to the days of the mainframe.

Docker containers are meant to be immutable, meaning the code and data they hold never change. Immutability is useful when you want to be sure the code running in production is the same as the code ...