RajashekarDandamudi / Spring_boot_application

Running on Docker Container

Spring_boot_application

• This application we are going to containerize.

Step 1 : Create and download a Spring Boot application with Spring initializr.

• Project zip file will be downloaded. Extract the zip and import to VS Code.

Step 2: Customize the application as per your needs and make a complete application.

• Add an index.html to the main/resources/static folder.
• Run the application.
• Verify the application is running or not.
• if the application works fine in the localhost next we are going to containerize the application.
• In VS Code run as maven build.
• It will create a jar file, which is used for the deployment of an application.

Step 3: Write a Dockerfile for containerizing our application.

use an openjdk base image with JDK

FROM openjdk:17

set the working directory in the container

WORKDIR /app

copy the JAR file into the container

COPY demo_DockerProject-0.0.1-SNAPSHOT.jar /app/spring-boot-app.jar

expose the container port

EXPOSE 8080

command to run the application

CMD ["java", "-jar", "spring-boot-app.jar"]

Step 4: Create a Docker image from the Dockerfile.

Run the build command to create a docker image from the docker file sudo docker build -t spring-boot-app . Check the image is created or not sudo docker images

Step 5 : Push the Docker image to Dockerhub.

• First tag the image with username of the github account docker tag spring-boot-app-image github(username)/spring-boot-app

• docker login (give the username and password for docker hub)

• docker push (pushing image to dockerhub) docker push github(username)/spring-boot-app

Step 6 : make sure your containerized application in the runnable state.

• Run the application as container in detached mode and on system port 8090. docker run -d -p 8090:8080 spring-boot-app-image
• Then check if the container is created or not. docker ps (command will give you the created container id)

Then go to the browser and check that application is available in the mapped system port(8090)

• http://publicip:8090 Application successfully deployed