How to configure JVM hotspot configurations for Spring Boot application when running inside docker?

Asked Aug 19 '20 at 07:28

Active Aug 19 '20 at 07:35

Viewed 310 times

I'm using the Dockerfile to pass the JVM configuration as follows.

FROM openjdk:11
COPY build/libs/api.jar /app/
EXPOSE 8080
ENTRYPOINT ["java", "-Xms256m", "-Xmx256m", "-jar", "app/api.jar"]

After building and running the container I goto the bash inside the container and execute java -XX:+PrintFlagsFinal -version | grep MaxHeapSize command to check if it is configured correctly. But the passed configurations(256mb max heap size) is not added correctly. What am I doing wrong here? I tried setting with environment variables as well. Still same result

edited Aug 19 '20 at 07:35

asked Aug 19 '20 at 07:28

Sidath Asiri

Try CMD instead of ENTRYPOINT – Rahul Agrawal Aug 19 '20 at 07:31
Still no change. It shows 4gb which is 1/4 of my total memory – Sidath Asiri Aug 19 '20 at 07:37
`java -XX:+PrintFlagsFinal` runs *new* Java process, unrelated to the command specified in `ENTRYPOINT` or `CMD` – apangin Aug 19 '20 at 07:51
Use `jcmd VM.flags` or `jcmd GC.heap_info` instead – apangin Aug 19 '20 at 07:56
Instead of using Xms and Xms parameters, it it probably a better choice to let the JVM size the heap based on the available memory in the container: https://stackoverflow.com/questions/54516988/what-does-usecontainersupport-vm-parameter-do – Erik Finnman Aug 27 '20 at 12:11

How to configure JVM hotspot configurations for Spring Boot application when running inside docker?

0 Answers0