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18-Practice-Test-Service-Networking.md

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Practice Test Service Networking

Solution

  1. What network range are the nodes in the cluster part of? 
    kubectl get nodes -o wide

    Note the INTERNAL-IP column to derive:

    192.20.116.0/24
  2. What is the range of IP addresses configured for PODs on this cluster? 
    kubectl get pods -A -o wide

    From this list, exclude the static control plane pods like kube-apiserver as these run on the host network, not the pod network. From the remaining pods we can derive:

    10.244.0.0/16
  3. What is the IP Range configured for the services within the cluster? 
    kubectl get service -A

    Note the CLUSTER-IP column to derive:

    10.96.0.0/12
  4. How many kube-proxy pods are deployed in this cluster? 
    kubectl get pod -n kube-system | grep kube-proxy

    Count the results

  5. What type of proxy is the kube-proxy configured to use?

    From the output of the above question, you have two kube-proxy pods, e.g.

    controlplane ~ kubectl get pod -n kube-system | grep kube-proxy
kube-proxy-rtr8p                       1/1     Running   0             56m
kube-proxy-t7w8f                       1/1     Running   0             56m

    Pick either and check its logs. The answer is there.

    k logs -n kube-system kube-proxy-rtr8p
  6. How does this Kubernetes cluster ensure that a kube-proxy pod runs on all nodes in the cluster? 
    kubectl get all -n kube-system

    From this, you can see that kube-proxy is a daemonset