I don’t understand how to write a Dockerfile to run Java HTTP

Question

I need to write a dockerfile that clones a repository from github and starts a simple Java server. Аm i moving in the right direction? please help

FROM alpine/git
WORKDIR /app
RUN git clone https://github.com/trekawek/jhttp.git 

FROM maven:3.5-jdk-8-alpine
WORKDIR /app
COPY --from=0 /app/jhttp /app 
RUN mvn install 

FROM openjdk:8-jre-alpine
WORKDIR /app
COPY --from=1 /app/target/jhttp-0.0.1.jar /app 
CMD ["java -jar jhttp-0.0.1.jar"] 

Answer 1

You are heading in the right direction in creating a Dockerfile that builds a Docker image. The image needs to contain all the dependencies your application requires, including Java itself.

I recommend reading Dockers official documentation on Dockerfile:

1. Create a Dockerfile
2. Dockerfile Reference
3. Best practices for writing Dockerfiles

The above links should provide enough information on creating a Dockerfile.