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Merge pull request #2091 from mikesir87/user-group-info 

Add clarification when using USER UID:GID
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Sebastiaan van Stijn 2020-01-16 15:24:28 +01:00 committed by GitHub
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@ -1484,6 +1484,9 @@ The `USER` instruction sets the user name (or UID) and optionally the user
group (or GID) to use when running the image and for any `RUN`, `CMD` and
`ENTRYPOINT` instructions that follow it in the `Dockerfile`.
> Note that when specifying a group for the user, the user will have _only_ the
> specified group membership. Any other configured group memberships will be ignored.
> **Warning**:
> When the user doesn't have a primary group then the image (or the next
> instructions) will be run with the `root` group.