How to get kubernetes components metric data in kubernetes?

Question

I am trying to get metric data like network in and out bytes, disk read and write speed, etc. On kubernetes dashboard, I am only getting memory and CPU data. I have even installed heapster, influx db and grafana in the kube-system namespace. When I run the command kubectl cluster-info it says, "This site can’t be reached." So, it seems the dashboard is running but not other API's. Is there any other way to fetch this metric data?

Answer 1

As you have installed heapster, influxdb and grafana. Therefore, you can aceess CPU, MEMORY and Storage Resouces by using the following command.

kubectl top pods --all-namespaces.

this command allows you to access resources consumption for pods.

furthermore, if you want to access resources consumptions for nodes.Then, you can shoot this command

kubectl top nodes 

Answer 2

Yes, you can get those data from heapster api.

Just add a new entry to your heapster.yaml file.
Under spec(service) add

type: NodePort 

(actullly you are exposing the heapster API by doing so).

Now your heapster.yaml file portion should look something like this

spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 8082
  selector:
    k8s-app: heapster

Now deploy your heapster.yaml again.

Now get services list from your kubernetes cluster using the followng command.

kubectl get services -n kube-system

There you can see the port of heapster something like this:

80:31637/TCP 

Now try to access the heapster API with the cluster IP and port.
Something like this:

http://192.168.99.100:31637/api/v1/model/metrics

You should be able to see the metrics now.
Refer https://github.com/kubernetes/heapster/blob/master/docs/model.md for further information.