Build & Deploy docker image using Gradle

You are tasked to create a gradle java application, Dockerfile to run the 'springbootify.jar' file on port 8080, use suitable gradle plugins to configure the gradle application to build a docker image and run the docker container. On successful deployment of docker container, hit the url (http://localhost:8080/doit) and you could see the message on the webpage.

Note:

• Jar file 'springbootify.jar' is already given in folder /Desktop/Project no need to build a need jar file.
• Please do install gradle using the command "sudo apt install gradle"
• Please do use "sudo service jenkins stop"
• Create a Docker & gradle application in the path /Desktop/Project
• Make the gradle project operable for both gradle & gradlew commands Docker base image: openj dk: 12-jdk-alpine.

Solving the tasks...

sudo apt install gradle
sudo service jenkins stop
cd /Desktop/Project

Create a new Gradle project using the following command:

gradle init

Add the following plugins to the build.gradle file to configure the Gradle application to build a Docker image:

build.gradle

plugins {
    id 'com.palantir.docker' version '0.22.1'
    id 'com.palantir.docker-run' version '0.22.1'
}
version '1.0-SNAPSHOT'
docker {
    name "${project.name}:${project.version}"
    files 'springbootify.jar'
}
dockerRun {
    name "${project.name}"
    image "${project.name}:${project.version}"
    ports '8080:8080'
    clean true
}

Now create a Dockerfile

Dockerfile

FROM openjdk:12-jdk-alpine
COPY springbootify.jar springbootify.jar
CMD ["java","-jar", "springbootify.jar"]

Lets first create a docker image

./gradlew docker

Check the created the docker image

docker ps

Next, run the docker image

./gradlew dockerRun

After this you can visit https://localhost:8080/doit, you can view the message

That's it! You have successfully created a Gradle Java application and Dockerfile, and deployed it using Docker.

Just some useful commands

# you can run jar file with, and check the https://localhost:8080/doit
java -jar springbootify.jar

# you can also use gradle to build java project
gradle init --type java-application

# to see all images
docker ps -a

# to remove image, use option -f to force delete
docker rmi <image-name/id>

# to remove container, use option -f to force delete
docker rm <container-name/id>

References: https://tomgregory.com/automating-docker-builds-with-gradle/

--- THANK YOU ---