CODEWITHSUNDEEP
javaspringmavendockerdockerfile
user1935987
user1935987

Reputation: 3347

Dockerizing Spring Application

I have a working app using Spring Framework + AngularJs front-end. I do deploy it on amazon AWS before by simply packaging mvn package into .war file.

Now I need to setup a linux env in docker locally to debug some additional functionality (Using windows as the main OS) and preferably to deploy this docker container in future.

I do seen some articles on dockerizing the Spring Boot app.

This is the example dockerfile from spring.io

FROM frolvlad/alpine-oraclejdk8:slim
VOLUME /tmp
ADD gs-spring-boot-docker-0.1.0.jar app.jar
RUN sh -c 'touch /app.jar'
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

My question is - how do I run my .war file on docker container?

Upvotes: 0

Views: 1100

Answers (3)

Kevin Hooke
Kevin Hooke

Reputation: 2621

If you configure/package your Spring Boot app as an executable .jar instead of a .war (Spring Boot Initializr will do this for you if you select the .jar option), then running it in your container is a matter of adding an entrypoint to run java with -jar and your jar name, like

ENTRYPOINT ["java", "-jar", "/opt/yourapp-0.0.1-SNAPSHOT.jar"]

Upvotes: 0

amjad
amjad

Reputation: 97

If you're looking to run this application on your local Linux machine, then you can create this Dockerfile in the same directory where the WAR file exists.

    FROM tomcat:8.0.21-jre8
    RUN [“rm”, “-rf”, “/usr/local/tomcat/webapps/ROOT”] 
    COPY dbconnect.war /usr/local/tomcat/webapps/ROOT.war
    CMD [“catalina.sh”, “run”]

You can then build the Docker image and provide your custom tag:

     docker build -t <your-username>/tomcat-example:latest .

Finally you can run this container.

     docker run -p 8080:8080 -d --name tomcat  <your-username>/tomcat-example:latest

You can check out these detailed examples here if need to run this application with a database or a web server.

https://github.com/dchqinc/dchq-docker-java-example

https://dzone.com/refcardz/java-containerization

Upvotes: 1

sinujohn
sinujohn

Reputation: 2604

You don't deploy a .war file in docker just like you deploy it into a tomcat server. You need to have a main(String args[]) entry point which is also specified in your jar's manifest file. Your app.jar specified as ENTRYPOINT will then run your main(). Inside the main() you can run an embedded web server which runs your application.

Upvotes: 1

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