Setting the stage: organisational circumstances Early stage: We started as a 2 person development team working on 2 containerised services. While we were concerned about scale, we weren't concerned about scaling the team itself, so we built our services using simple makefiles, not considering the future cost. Growth: After few months we found ourselves working with ~20 developers from 3 different teams, across several countries, all on the same project. We have 25 containeris

Design pattern for lean docker images and fast develop / build iterations Problems to be solved Long build time Long upload to registry Ways solving the problems Avoid installing dependencies on high frequency builds (i.e install dependencies on base image) Reduce image size by using small base image, install dependencies for compile time and runtime, remove all compile time dependencies when build finished Schematics Explanation Base layer Depending on what we are trying to