Multi-Stage Builds

Part of the Docker course

Build a container image for a compiled program the obvious way and you get something startling: a 900 megabyte image whose useful contents are one 8 megabyte file. Everything else is the compiler, the package manager that installed the compiler, the header files, the intermediate object files and the module cache.

It is the difference between a workshop and the chair you made in it. You do not deliver the chair by shipping the workshop with the chair inside it. You take the chair out. ...