I agree on base image point. Although if we have python apps in the image, it should not matter (both 2-alpine3.7 and 3-alpine3.8 work ok). Systemd vs sysv is

I agree on base image point. Although if we have python apps in the image, it should not matter (both 2-alpine3.7 and 3-alpine3.8 work ok). Systemd vs sysv is not an issue in docker containers since it's (mostly) not used. If you are using an init system, you are probably using tini (included in recent Docker) or supervisord (usually used for older/legacy c/c++ apps).