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Status Under review
Workspace IBM Turbonomic ARM
Categories Container Platforms (K8s & OpenShift)
Created by Guest
Created on Aug 12, 2026

RELATED IDEAS

Change JVM Heap values inside containers

We already have other technologies doing this: https://scaleops.com/product/java-resource-management/

I spoke with Java and Integration SE here to get some ideas what is going on there. Here are the findings:

  • From Java 10 and beyond, enables automatic container awareness, allowing the JVM to respect cgroup limits (/sys/fs/cgroup/memory) rather than reading host resources.
  • We can change the hard config from Xmx and Xms, as a percentage: -XX:MaxRAMPercentage=75.0 and the rest of resize at container level is without disruption.
  • We can change the deployment, forcing the config passthrough container:

- name: Configure JVM RAM percentages  ansible.builtin.lineinfile:    path: /etc/default/my-java-app    regexp: '^JVM_OPTS='line: 'JVM_OPTS="-XX:InitialRAMPercentage=40.0 -XX:MaxRAMPercentage=80.0"'notify: Restart java service 


It's true that JVM need to restart to understand new memory, but if the app is modern, the user session and configs can be preserved (Redis, etc.).

Idea priority Urgent
  • Admin
    Murtuza Mukadam
    Sep 7, 2026

    Hi Ricardo, thank you for submitting this idea. We have started looking into this work and have added the feature request to our roadmap. I will continue to share updates as we make progress.

    Reply

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