November 2018
Beginner
230 pages
6h 4m
English
Content preview from Docker Quick Start Guide
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The CMD instruction
The CMD instruction is used to define the default action taken when containers are run from images built with their Dockerfile. While it is possible to include more than one CMD instruction in a Dockerfile, only the last one will be significant. Essentially, the final CMD instruction provides the default action for the image. This allows you to either override or use the CMD in the image used in the FROM instruction of your Dockerfile. Here is an example where a trivial Dockerfile does not contain a CMD instruction and relies on the one found in the ubuntu image used in the FROM instruction:
You can see from the output ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.