Docker

One of the things I find quite annoying is cleaning up Docker images on a development machine, such as my laptop. Over time, they tend to accumulate as you experiment with things, clogging up your machine. It’s really handy to have a quick and easy way to get rid of them. As I typically work from the command line, I wanted a way to do it there, and so I created a shell alias that does it in combination with fzf.

I’ve been working with Docker a lot recently, and have been switching to non-root users within the Dockerfile using the USER instruction (not for security reasons, but in order to test software not as root). As a result, I’ve been suffering a little from this issue - essentially, files copied into a Docker image using ADD or COPY are copied with the owner as root, irrespective of the ownership outside the Docker image. According to this comment, this behaviour in Dockerfiles won’t change, at least in the near future.