containerization-and-devops

Class 2 - Java Docker Application

Subfolder: java-docker

Objective

To containerize a simple Java application using Docker, build images using different Dockerfiles, run containers, and push the image to Docker Hub.

Project Structure

java-docker/
│── Hello.java
│── Dockerfile
│── second.Dockerfile
│── image1.png
│── image2.png
│── image3.png
│── image4.png
│── image5.png
│── image6.png
│── image7.png
│── image8.png
│── image9.png
│── README.md

Step 1 – Create Java Application

Hello.java

public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello from Java Docker");
    }
}

Step 2 – Create Dockerfile (Version 1)

FROM eclipse-temurin:17-jdk
WORKDIR /home/app
COPY Hello.java .
RUN javac Hello.java
CMD ["java", "Hello"]

Dockerfile Version 1

Step 3 – Create second.Dockerfile (Version 2)

FROM eclipse-temurin:17-jdk
WORKDIR /home/app
COPY Hello.java .
RUN javac Hello.java
CMD ["echo", "Hello from version 2"]

Dockerfile Version 2

Step 4 – Build Image Using second.Dockerfile

Command:

docker build -t java-app:1.1 -f second.Dockerfile .

Docker Build Output

Step 5 – Run the Container

Command:

docker run java-app:1.1

Output:

Hello from version 2

Docker Run Output

Step 6 – Generate Docker Hub Personal Access Token

Docker Hub Token Page

Step 7 – Login to Docker Hub

Command:

docker login -u nakul710

Docker Login

Step 8 – Tag the Image

Command:

docker tag java-app:1.1 nakul710/java-app:1.1

Docker Tag

Step 9 – Push Image to Docker Hub

Command:

docker push nakul710/java-app:1.1

Docker Push

Step 10 – Image Available on Docker Hub

Docker Hub Repository

Result

Successfully:

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