kube-pod-graph monitors pods on a kubernetes deployment for state changes, and generates a visualization of the pod states over time. This is useful for analyzing the deployment of complex workloads to determine bottlenecks, and debug causes of failure.
To get started, you will need to clone the kube-pod-graph repository and run npm install to install dependencies. You will also need the kubectl client, and a valid kubeconfig and context.
To start monitoring all pods on a kubernetes installation, source scripts/kubectl-get-pods-monitoring.sh, and run monitor_kubectl_pods. This function will create the klog/monitor_kubectl_pods directory in your $HOME path, and begin saving snapshots of the output of the kubectl get pods --all-namespaces command. When your workload deployment is complete, failed, or stalled, you can terminate the monitor_kubectl_pods process.
Next, you will need to generate a file containing a JSONP script, and place it in your clone of the kube-pod-graph repository at data/kube-pod-data-jsonp.js (note: the name here is currently hardcoded into index.js):
./scripts/generate-jsonp.sh ~/klog/monitor_kubectl_pods/ > data/kube-pod-data-jsonp.js
Finally, you'll need to start the server:
npm start
Once started, you should be able to navigate to http://localhost:8080 to see a visualization of your kube pods. The select box at the top will allow you to select the namespace you'd like to visualize. Additionally, you can hover over the labels to get the exact time a pod was in a given state (beginning, end, and duration)