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docs: remove docs for —-from=index 

Naming stages is the preferred method for using
multi-stage builds.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2020-07-27 15:56:23 -07:00
parent 415fe22dbe
commit 5dd9bd4c2c
1 changed files with 5 additions and 6 deletions
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11
docs/reference/builder.md
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@ -666,7 +666,7 @@ the [*Public Repositories*](https://docs.docker.com/engine/tutorials/dockerrepos
instructions.
- Optionally a name can be given to a new build stage by adding `AS name` to the
`FROM` instruction. The name can be used in subsequent `FROM` and
`COPY --from=<name|index>` instructions to refer to the image built in this stage.
`COPY --from=<name>` instructions to refer to the image built in this stage.
- The `tag` or `digest` values are optional. If you omit either of them, the
builder assumes a `latest` tag by default. The builder returns an error if it
cannot find the `tag` value.
@ -1311,12 +1311,11 @@ no lookup and does not depend on container root filesystem content.
> If you build using STDIN (`docker build - < somefile`), there is no
> build context, so `COPY` can't be used.
Optionally `COPY` accepts a flag `--from=<name|index>` that can be used to set
Optionally `COPY` accepts a flag `--from=<name>` that can be used to set
the source location to a previous build stage (created with `FROM .. AS <name>`)
that will be used instead of a build context sent by the user. The flag also
accepts a numeric index assigned for all previous build stages started with
`FROM` instruction. In case a build stage with a specified name can't be found an
image with the same name is attempted to be used instead.
that will be used instead of a build context sent by the user. In case a build
stage with a specified name can't be found an image with the same name is
attempted to be used instead.
`COPY` obeys the following rules: