问题
I am successfully using Docker's Multi-Stage feature to build some code and then copy the resulting artifacts into a final image.
Is it possible to split this one big-ish Dockerfile into multiple files?
I would like to improve the readability of the individual stages. Which will become more important when more stages are added.
EDIT: I am aware that I could write a Makefile (or similar) where I first build an image named "myproject-stage1" and then use FROM myproject-stage1 AS build. However, I'd rather avoid the external build tool if possible.
回答1:
If your Dockerfile currently looks something like:
FROM ubuntu:16.04 AS builder
RUN apt-get install build-essential
COPY . ./
RUN ./build_all_the_things \
&& make install PREFIX=/usr DESTDIR/out
FROM alpine:3.8
COPY --from=builder /out/ /
CMD the_app
You can readily split out the first part into its own Dockerfile, as is, and build it
docker build -f Dockerfile.builder -t me/builder .
COPY --from has to name some previous stage in your Dockerfile, but the stage doesn’t need to do much; you can then change the second half of this to
FROM me/builder AS builder
FROM alpine:3.8
COPY --from=builder /out/ /
CMD the_app
The big downside of this is that you need two separate docker build commands to actually build the final image. You could write a shell script to do both of them together.
来源：https://stackoverflow.com/questions/53659993/docker-multi-stage-how-to-split-up-into-multiple-dockerfiles