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Update dockerfile_best-practices.md (#7336) 

LGTM, thanks!
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Wojtek Wrona 2019-07-12 23:08:46 +02:00 committed by Adrian Plata
parent 7c1d91e3cc
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@ -867,7 +867,7 @@ like `RUN groupadd -r postgres && useradd --no-log-init -r -g postgres postgres`
Avoid installing or using `sudo` as it has unpredictable TTY and
signal-forwarding behavior that can cause problems. If you absolutely need
functionality similar to `sudo`, such as initializing the daemon as `root` but
running it as non-`root`), consider using ["gosu"](https://github.com/tianon/gosu).
running it as non-`root`, consider using [“gosu”](https://github.com/tianon/gosu).
Lastly, to reduce layers and complexity, avoid switching `USER` back and forth
frequently.
@ -896,7 +896,7 @@ A Docker build executes `ONBUILD` commands before any command in a child
`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/2.4/jessie/onbuild/Dockerfile).
`Dockerfile`, as you can see in [Ruby’s `ONBUILD` variants](https://github.com/docker-library/ruby/blob/c43fef8a60cea31eb9e7d960a076d633cb62ba8d/2.4/jessie/onbuild/Dockerfile).
Images built from `ONBUILD` should get a separate tag, for example:
`ruby:1.9-onbuild` or `ruby:2.0-onbuild`.