--- title: "Troubleshoot application misbehavior after an OpenShift upgrade" url: https://daily.dev/posts/troubleshoot-application-misbehavior-after-an-openshift-upgrade-pzdsijiaf source_url: https://developers.redhat.com/articles/2026/06/18/troubleshoot-application-misbehavior-after-openshift-upgrade type: article source: "Red Hat Developer" published: 2026-06-18T14:12:29.556Z updated: 2026-06-18T14:51:02.244Z tags: ["java", "openshift", "jvm"] reading_time: 8 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Troubleshoot application misbehavior after an OpenShift upgrade **[Red Hat Developer](https://daily.dev/sources/rhdev)** · 8 min read · 0 upvotes · 0 comments ## Summary After upgrading Red Hat OpenShift, applications can misbehave due to several root causes: image or tag changes, workload shifts, instrumentation overhead, non-container-aware runtimes, cgroups v1-to-v2 migration failures, and unbounded deployments. The guide focuses on container awareness — how JVMs and native libraries like jemalloc or Netty detect (or fail to detect) container resource limits. Key scenarios include JVM failing to detect cgroups v2 limits after an upgrade to OpenShift 4.19 (which drops cgroups v1), and unbounded deployments where host CPU/memory directly inflates thread pools and heap sizing. Diagnostic steps include verifying cgroups compatibility, checking VM.info for heap and CPU detection data, and benchmarking to distinguish intermittent from persistent failures. A summary table maps each scenario to its diagnostic action and verification step. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Kubernetes Resource Management: Optimizing High-Resource Initialization Workloads](https://daily.dev/posts/kubernetes-resource-management-optimizing-high-resource-initialization-workloads-kd5vqgffk) · Cast AI · 6 upvotes · 0 comments - [What's new in OpenShift Container Platform system management](https://daily.dev/posts/what-s-new-in-openshift-container-platform-system-management-ubjbmzabp) · Red Hat Developer · 0 upvotes · 0 comments - [Debugging image mode with Red Hat OpenShift 4.20: A practical guide](https://daily.dev/posts/debugging-image-mode-with-red-hat-openshift-4-20-a-practical-guide-wetoks9q8) · Red Hat Developer · 0 upvotes · 0 comments - [Stop Guessing Why Your Pods Are Crashing](https://daily.dev/posts/stop-guessing-why-your-pods-are-crashing-disrbycve) · Coralogix · 3 upvotes · 1 comments - [A case study in Kubelet regression in OpenShift](https://daily.dev/posts/a-case-study-in-kubelet-regression-in-openshift-pyf2hjm0f) · Red Hat Developer · 2 upvotes · 0 comments --- Tags: [#java](https://daily.dev/tags/java), [#openshift](https://daily.dev/tags/openshift), [#jvm](https://daily.dev/tags/jvm) [View this post on daily.dev](https://daily.dev/posts/troubleshoot-application-misbehavior-after-an-openshift-upgrade-pzdsijiaf)