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Add note to avoid ADD and use COPY instead.

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Docker best practices [1] and other posts [2] recommends to use COPY instead of ADD. This PR makes it clear.

[1]: https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/#add-or-copy
[2]: https://www.ctl.io/developers/blog/post/dockerfile-add-vs-copy/
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ttres 2016-02-09 15:38:45 -02:00
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@ -208,8 +208,8 @@ In order to push to this repository tag image with `repositoryHostName:5000/imag
* [CMD](https://docs.docker.com/reference/builder/#cmd) provide defaults for an executing container.
* [EXPOSE](https://docs.docker.com/reference/builder/#expose) informs Docker that the container listens on the specified network ports at runtime. NOTE: does not actually make ports accessible.
* [ENV](https://docs.docker.com/reference/builder/#env) sets environment variable.
* [ADD](https://docs.docker.com/reference/builder/#add) copies new files, directories or remote file to container. Invalidates caches.
* [COPY](https://docs.docker.com/reference/builder/#copy) copies new files or directories.
* [ADD](https://docs.docker.com/reference/builder/#add) copies new files, directories or remote file to container. Invalidates caches. Avoid `ADD` and use `COPY` instead.
* [COPY](https://docs.docker.com/reference/builder/#copy) copies new files or directories to container.
* [ENTRYPOINT](https://docs.docker.com/reference/builder/#entrypoint) configures a container that will run as an executable.
* [VOLUME](https://docs.docker.com/reference/builder/#volume) creates a mount point for externally mounted volumes or other containers.
* [USER](https://docs.docker.com/reference/builder/#user) sets the user name for following RUN / CMD / ENTRYPOINT commands.