Create docker file for spring cloud config server

Question

I am trying to build docker image for my config server. These are the steps which I have followed:

• Open https://start.spring.io/ and added config-server as a dependancies. then downloaded the project.
• Added @EnableConfigServer annotation in demo\\src\\main\\java\\com\\example\\demo\\DemoApplication.java
• Added below code in demo\\src\\main\\resources\\application.properties

server.port=8888 spring.cloud.config.server.git.uri=https://github.com/mygitusername/configserverdata.git

When I started config server using command mvn spring-boot:run on local, It's working fine.

Now I want to create docker image for my config server. for this I get this docker file from here .

FROM maven:alpine
MAINTAINER hyness <hyness@freshlegacycode.org>

EXPOSE 8888
COPY . /Demo/
WORKDIR /Demo/
RUN mvn package
VOLUME /config
WORKDIR /
ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar",\
            "/Demo/target/Demo.jar",\
            "--server.port=8888",\
            "--spring.config.name=application"]

When I execute docker build -t spring-cloud-config-server . it says BUILD Failure with this reason

The goal you specified requires a project to execute but there is no POM in this directory (/demo). Please verify you invoked Maven from the correct directory.

Please help me to create correct docker file for my config server.

It might be a silly question, But I need to specify mvn spring-boot:run in Dockerfile as well.

I've just started learning docker.

Answer 1

I have just built the application and it works fine with this Dockerfile and dirs layout (have alook at "COPY ./demo /demo/") :

FROM maven:alpine
MAINTAINER hyness <hyness@freshlegacycode.org>

EXPOSE 8888
COPY ./demo /demo/
WORKDIR /demo/
RUN mvn package
VOLUME /config
WORKDIR /
ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar",\
            "/demo/target/demo.jar",\
            "--server.port=8888",\
            "--spring.config.name=application"]
$ tree
.
├── demo
│   ├── pom.xml
│   └── src
│       └── main
│           ├── java
│           │   └── com
│           │       └── example
│           │           └── demo
│           │               └── DemoApplication.java
│           └── resources
│               └── application.properties
└── Dockerfile