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Updated the explanation of ONBUILD in best-practices doc

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Signed-off-by: Tonny Xu <tonny.xu@gmail.com>
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Tonny Xu 2015-03-31 11:44:58 +09:00
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10
docs/sources/articles/dockerfile_best-practices.md
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@ -398,7 +398,15 @@ troubleshoot, and maintain.
### [`ONBUILD`](https://docs.docker.com/reference/builder/#onbuild)
`ONBUILD` is only useful for images that are going to be built `FROM` a given
An `ONBUILD` command executes after the current `Dockerfile` build completes.
`ONBUILD` executes in any child image derived `FROM` the current image. Think
of the `ONBUILD` command as an instruction the parent `Dockerfile` gives
to the child `Dockerfile`.
A Docker build executes `ONBUILD` commands before any command in a child
`Dockerfile`.
`ONBUILD` is useful for images that are going to be built `FROM` a given
image. For example, you would use `ONBUILD` for a language stack image that
builds arbitrary user software written in that language within the
`Dockerfile`, as you can see in [Ruby’s `ONBUILD` variants](https://github.com/docker-library/ruby/blob/master/2.1/onbuild/Dockerfile).