Talk

Amadeus runs JBoss EAP containers in production on OpenShift. In this talk you will discover the "banana box principle", i.e. a box in a box in a box. Come learn some rudimentary JVM and container internals to start your JVM cloud experience with a smile.

What we will first look at are the different boxes with a focus on memory

• Box 1 : JVM memory management (for us OpenJDK)
• Box 2 : Container memory limits (Linux cgroups)
• Box 3 : Openshift node memory (the VM provisioned by Openstack)

Then we look at our production use case where we

• run a monolith EAR on a multi-GB JBoss EAP container by Red Hat
• scaled this JBoss JVM container to dozens of pods
• needed to investigate why our JVM containers started core & heap dumping
• use tools like InfluxDB & Grafana to monitor the stack
• are lucky to have Openshift that mitigates cleverly any dying container