How to package SpringBoot project into Docker image

There are two options for packaging the SpringBoot project into a Docker image:

Full automation: First build the docker image warehouse, and then configure the warehouse address in the project's maven configuration. Configure the Dockerfile file in the project, so that it can be packaged directly in the idea and automatically uploaded to the image warehouse, and then just start the image on the server.

Semi-automation: There are two options for semi-automation. One is to place the Dockerfile file inside the project, and the other is to place it outside the project.

• Put it in the project: configure maven plug-in support in springboot pom.

• #Put it outside the project: springboot is still packaged into an ordinary jar, and then upload the jar to the server. At the same time, create a Dockerfile file on the server, execute the docker build command, and build this jar into a docker image, and then execute it through the image.

Generally speaking, semi-automation is used more than full automation. This article uses the second method of semi-automation. Generally speaking, there are several steps:

#发布到网上时只会把jar包和Dockerfile发布上去
COPY *.jar /app.jar
#地址映射
CMD ["--server.port=8080"]
#对外暴露端口
EXPOSE 8080
#执行命令
ENTRYPOINT ["java","-jar","/app.jar"]

(Note: Docker Desktop is installed on my computer)

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