12. Docker – Implementation => Project one

Docker – Implementation => Project one

This project can be download from this github URL.

 https://github.com/LahiruPriyankara/DockerTestProjects

This is very basic spring boot project to test docker containerization.

Open Spring tool suit.

Create new Spring boot Proj name docker-springBoot-one

Create a controller class under src directory.

package com.lahiru.demo;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class Controller {

@GetMapping("/test")

public String testMethod() {

return "Called successfully..!";

}

}

Go to pom.xml and give a custom name to the jar file which will be generated (docker_SB_1).

<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

<finalName>docker_SB_1</finalName>

</build>

..

Go to application properties file.and give a server port.

server.port=8081

 

Create Docker file name Dockerfile and add below configuration.

FROM openjdk:11

ARG JAR_FILE=target/docker_SB_1.jar

COPY ${JAR_FILE} app.jar

EXPOSE 9091

ENTRYPOINT ["java","-jar","/app.jar"]

 

Right click on the project => run as => maven install.

Then jar file is generated in the target folder with named docker_SB_1.

Then run the project and see the output.

Then go to the project folder. Inside docker-springBoot-one you can see Dockerfile also. Right click in the docker-springBoot-one folder and open in terminal.

docker build -f Dockerfile  -t sb_prj_one_img  .

docker images

docker run -p 8081:8081 --name sb_prj_one_cont -d sb_prj_one_img

                                                            OR

docker run -p 7081:8081 --name sb_prj_one_cont -d sb_prj_one_img

docker container ls