# Setup WeaveNet CNI monitoring using kube-prometheus
[WeaveNet](https://kubernetes.io/docs/concepts/cluster-administration/networking/#weave-net-from-weaveworks) is a resilient and simple to use CNI for Kubernetes. A well monitored and observed CNI helps in troubleshooting Kubernetes networking problems. [WeaveNet](https://www.weave.works/docs/net/latest/concepts/how-it-works/) emits [prometheus metrics](https://www.weave.works/docs/net/latest/tasks/manage/metrics/) for monitoring WeaveNet. There are many ways to install WeaveNet in your cluster. One of them is using [kops](https://github.com/kubernetes/kops/blob/master/docs/networking.md).

Following this document, you can setup weave net CNI monitoring for your cluster using kube-prometheus.

## Contents
Using kube-prometheus and kubectl you will be able install the following for monitoring weave-net in your cluster:

1. [Service for WeaveNet](https://gist.github.com/alok87/379c6234b582f555c141f6fddea9fbce) The service which the [service monitor](https://coreos.com/operators/prometheus/docs/latest/user-guides/cluster-monitoring.html) scraps.
2. [ServiceMonitor for WeaveNet](https://gist.github.com/alok87/e46a7f9a79ef6d1da6964a035be2cfb9) Service monitor to scraps the weavenet metrics and bring it to Prometheus.
3. [Prometheus Alerts for WeaveNet](https://stackoverflow.com/a/60447864) This will setup all the important weave net metrics you should be alerted on.
4. [Grafana Dashboard for WeaveNet](https://grafana.com/grafana/dashboards/11789) This will setup the per CNI pod level monitoring for weave net.
5. [Grafana Dashboard for WeaveNet(Cluster)](https://grafana.com/grafana/dashboards/11789) This will setup the cluster level monitoring for weave net.

## Instructions
- You can monitor weave-net CNI using kube-prometheus with:
[embedmd]:# (../examples/weavenet-example.jsonnet)
```jsonnet
local kp =  (import 'kube-prometheus/kube-prometheus.libsonnet') +
            (import 'kube-prometheus/kube-prometheus-weavenet.libsonnet');

{ ['00namespace-' + name]: kp.kubePrometheus[name] for name in std.objectFields(kp.kubePrometheus) } +
{ ['0prometheus-operator-' + name]: kp.prometheusOperator[name] for name in std.objectFields(kp.prometheusOperator) } +
{ ['node-exporter-' + name]: kp.nodeExporter[name] for name in std.objectFields(kp.nodeExporter) } +
{ ['kube-state-metrics-' + name]: kp.kubeStateMetrics[name] for name in std.objectFields(kp.kubeStateMetrics) } +
{ ['prometheus-' + name]: kp.prometheus[name] for name in std.objectFields(kp.prometheus) } +
{ ['prometheus-adapter-' + name]: kp.prometheusAdapter[name] for name in std.objectFields(kp.prometheusAdapter) }
```

- After you have the required yamls file please run
```
kubectl create -f prometheus-serviceWeaveNet.yaml
kubectl create -f prometheus-serviceMonitorWeaveNet.yaml
kubectl apply -f  prometheus-rules.yaml
kubectl apply -f grafana-dashboardDefinitions.yaml
```