Correct and agreed, hence my "but works" portion of the comment! The notion of portability is Docker's bread and butter. With proper version pinning you _might

Correct and agreed, hence my "but works" portion of the comment! The notion of portability is Docker's bread and butter. With proper version pinning you _might_ get lucky with repeatability too. Most people anticipate repeatability to be part of portability, but it really is a distinct notion.