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kube-latency

This is a simple little tool, that helps to measure bandwidth and latency in a kubernetes Pod Network.

Screenshot Grafana

Tests

These tests are excuted on every Node (through a DaemonSet) every 10 seconds

  • Test /ping all other Pods (5 times)
  • Download /data (16MBytes) from one randomly selected node

The result of the tests is tagged with Zone, Node and Pod information and scraped by Prometheus. The results can graphed using Grafana.

Example test case

# Setup prometheues + kube-latency in cluster using helm
## prometheus runs on nodes that are labeled `role: monitoring`
## kube-latency runs on nodes that are labeled `role: worker`
helm upgrade --install --values contrib/test/kube-latency-values.yaml test-kl contrib/helm/kube-latency

# Setup grafana
helm upgrade --install --values contrib/grafana/helm-values.yaml grafana stable/grafana

# Port forwards
## prometheus localhost:9090
## grafana    localhost:9091
kubectl port-forward --namespace default $(kubectl get pods --namespace default -l "app=prometheus,release=test-kl" -o jsonpath="{.items[0].metadata.name}") 9090:9090
kubectl port-forward --namespace default $(kubectl get pods --namespace default -l "app=grafana-grafana,component=grafana" -o jsonpath="{.items[0].metadata.name}") 9091:3000

# add the datasource to grafana

# Import Grafana's dashboard from contrib/grafana/kube-latency-dashboard.json.
The username and password for Grafana is admin.

# Scale up the asg
for i in {6..100..3}; do
  echo "scaling to $i" && aws autoscaling set-desired-capacity --auto-scaling-group-name kubernetes-nonprod_devcluster-worker --desired-capacity $i && sleep 60
done