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From where the docker image getting build

If the given DockerFile directory contains any files /folder it will also get added to the image

How to avoid?

Use .dockerignore file to add all un-neccessary files/folders. This works exactly same as .gitignore

Dangling images

Dockers are read-only, that means when you create a image with same name, previous version of image will become <none>

List all dangling images

docker images -f dangling=true -q

Delete all dangling images

docker rmi $(docker images -f dangling=true -q)

Multi-Stage image

To reduce the size of images

FROM maven:3.6-alpine as builder

COPY java-repo /java-repo

WORKDIR /java-repo

RUN maven package

FROM openjdk:11-alpine

COPY --from=builder /java-repo/target/java-repo-1.0-SNAPSHOT.jar /java-repo.jar

CMD java -jar /java-repo.jar

In the above DockerFile, Maven image is dicarded and used only JDK-alpine to build the image