create docker image from rust workspace - docker

Question

Hi I have a cargo workspace and there are multiple projects on it. Now I want to dockerize it but I want every project in separate image. Is there a way to build entire workspace and create multiple images from that build?
right now im using a separate dockerfile to build every project like this:
this is the dockerfile for groups-service:
FROM rust:slim AS builder
RUN rustup target add x86_64-unknown-linux-musl
RUN apt update && apt install -y musl-tools musl-dev
RUN update-ca-certificates
WORKDIR /usr/src/app
# copy entire workspace
COPY . .
RUN cargo build --target x86_64-unknown-linux-musl --release
FROM alpine
COPY --from=builder /usr/src/app/target/x86_64-unknown-linux-musl/release/groups-service ./
CMD [ "./groups-service" ]
and i have a dockerfile for every service.
but i want to have a single dockerfile that produces multiple images with different names like service/groups service/report service/graph so i can run docker build . once and have all services build.
because it takes a lot of time to build it right now and i want to reduce and simplify my work

Answer 1

Simply build all your images from the same Dockerfile, e.g.:
FROM rust:slim AS builder
RUN rustup target add x86_64-unknown-linux-musl
RUN apt update && apt install -y musl-tools musl-dev
RUN update-ca-certificates
WORKDIR /usr/src/app
# copy entire workspace
COPY . .
RUN cargo build --target x86_64-unknown-linux-musl --release
FROM alpine
COPY --from=builder /usr/src/app/target/x86_64-unknown-linux-musl/release/groups-service ./
CMD [ "./groups-service" ]
FROM alpine
COPY --from=builder /usr/src/app/target/x86_64-unknown-linux-musl/release/groups-report ./
CMD [ "./groups-report" ]
Then running docker build will build all the target images at once using the same builder. You can then set the image names with docker tag. In order to facilitate identification of the built images, you can add a LABEL to each image:
...
FROM alpine
COPY --from=builder /usr/src/app/target/x86_64-unknown-linux-musl/release/groups-service ./
CMD [ "./groups-service" ]
LABEL service=groups
FROM alpine
COPY --from=builder /usr/src/app/target/x86_64-unknown-linux-musl/release/groups-report ./
CMD [ "./groups-report" ]
LABEL service=report
Then use docker image inspect --format='{{.Config.Labels}}' or docker image ls --filter=label=<key>=<value> to identify the images. E.g.:
docker tag $(docker image ls --filter=dangling=true --filter=label=service=groups) service/groups
docker tag $(docker image ls --filter=dangling=true --filter=label=service=report) service/report