k8s-java-dump-tool

A lightweight web-based utility for generating Java thread dumps and heap dumps from Java applications running inside Kubernetes pods.

This tool wraps common kubectl exec workflows behind a simple Python web service, making it easier to diagnose JVM issues such as deadlocks, high CPU usage, or memory leaks in Kubernetes environments.

Features

• Generate Java thread dumps (jstack) from running pods
• Generate Java heap dumps (jmap) from running pods
• Simple web UI for selecting namespaces and pods
• Ability to download dump files locally
• Uses existing kubectl configuration (no cluster agents required)

Requirements

• Python 3.7+
• kubectl installed locally
• Access to a Kubernetes cluster via kubeconfig
• Java applications running in Kubernetes pods
• JVM tools (jstack, jmap) available inside the target container

Running

python3 /Users/${YOU}/Documents/tools/dumpv2/app.py >/dev/null 2>&1 & sleep 1 && open http://localhost:5001;fg

Usage

Web Interface

From the UI you can:

1. Select a Kubernetes namespace
2. Select a pod (and container, if applicable)
3. Trigger a thread dump
4. Trigger a heap dump
5. Download the generated dump files