docker - Dockerfile naming, .dockerfile vs Dockerfile -

i'm new dockerfile nomenclature , have noticed few different examples of dockerfiles in repos throughout org including following types:

• dockerfile
• dockerfile.build
• .dockerfile

is there somewhere can find detailed explanation different use cases , purposes of each?

docker build [options] path | url | - build command docker, details here.

docker build command expects file name dockerfile. so, in case, can

docker build . 

on other cases, have specify full name

docker build -f dockerfile.build . 

so file name has nothing container itself. naming own convenience.