How do you configure JVM memory in a Dockerfile?

To configure JVM memory, you can use the “ENV” command in the Dockerfile to set the JAVA_OPTS environment variable, and then pass these parameters to the JVM when starting the container.

Below is an example of a Dockerfile:

FROM openjdk:8

ENV JAVA_OPTS="-Xms256m -Xmx512m"

ADD your-app.jar /app.jar

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

In this example, we are utilizing the openjdk:8 as the base image, and then we are configuring the JAVA_OPTS environment variable to be “-Xms256m -Xmx512m”, which will allocate 256MB for the initial heap size and 512MB for the maximum heap size for the JVM.

Next, use the ADD command to copy your application JAR file to the /app.jar path within the image.

Finally, specify the command to be executed when the Docker container starts using the ENTRYPOINT command, which is to run the /app.jar file with the java command.

This way, when you build and run this Docker image, the JVM will utilize the configured memory settings.