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For information about querying labels, refer to the items related to filtering in Managing labels on objects. Dockerfile reference for the RUN instruction As always, to make your , as many of the “essential” packages from the parent images won’t upgrade inside an unprivileged container.If a package contained in the parent image is out-of-date, you should contact its maintainers.Decoupling applications into multiple containers makes it much easier to scale horizontally and reuse containers.For instance, a web application stack might consist of three separate containers, each with its own unique image, to manage the web application, database, and an in-memory cache in a decoupled manner.While “one process per container” is frequently a good rule of thumb, it is not a hard and fast rule.Use your best judgment to keep containers as clean and modular as possible.
Images being built by the final stage only, you can most of the time benefit both the build cache and minimize images layers.Your build stage may contain several layers, ordered from the less frequently changed to the more frequently changed for example: FROM golang:1.9.2-alpine3.6 AS build # Install tools required to build the project # We will need to run `docker build --no-cache .` to update those dependencies RUN apk add --no-cache git RUN go get github.com/golang/dep/cmd/dep # and lists project dependencies # These layers will only be re-built when Gopkg files are updated COPY /go/src/project/ WORKDIR /go/src/project/ # Install library dependencies RUN dep ensure -vendor-only # Copy all project and build it # This layer will be rebuilt when ever a file has changed in the project directory COPY ./go/src/project/ RUN go build -o /bin/project # This results in a single layer image FROM scratch COPY --from=build /bin/project /bin/project ENTRYPOINT ["/bin/project"] CMD ["--help"] In order to reduce complexity, dependencies, file sizes, and build times, you should avoid installing extra or unnecessary packages just because they might be “nice to have.” For example, you don’t need to include a text editor in a database image.If containers depend on each other, you can use Docker container networks to ensure that these containers can communicate.Prior to Docker 17.05, and even more, prior to Docker 1.10, it was important to minimize the number of layers in your image.
You may have heard that there should be “one process per container”.