1. What is the MAC address assigned to node01?
> ssh node01
> ip address
2. We use Containerd as our container runtime. What is the interface/bridge created by Containerd on the controlplane node?
> ip address show type bridge
3. If you were to ping google from the controlplane node, which route does it take? What is the IP address of the Default Gateway?
> ip route
4. What is the port the kube-scheduler is listening on in the controlplane node?
> netstat -npl | grep -i scheduler
5. Notice that ETCD is listening on two ports. Which of these have more client connections established?
> netstat -npa | grep -i etcd
> netstat -npa | grep -i etcd | grep -i 2379 | wc -l
Explore CNI
6. Inspect the kubelet service and identify the container runtime endpoint value is set for Kubernetes.
> ps -aux | grep -i kubelet | grep container-runtime
7. What is the CNI plugin configured to be used on this kubernetes cluster?
> cd /opt/cni/bin
> ls /etc/cni/net.d
8. What binary executable file will be run by kubelet after a container and its associated namespace are created?
> cd /etc/cni/net.d
> cat 10-flannel.conflist
9. Deploy weave-net networking solution to the cluster.
NOTE: - We already have provided a weave manifest file under the /root/weave directory.
> kubectl apply -f /root/weave/weave-daemonset-k8s.yaml
10. What is the Networking Solution used by this cluster?
> cd /etc/cni/net.d
> ls
11. How many weave agents/peers are deployed in this cluster?
> k get pods -n kube-system
12. What is the POD IP address range configured by weave?
> k get pods -n kube-system
> k logs -n kube-system weave-net-56tfn
13. What is the default gateway configured on the PODs scheduled on node01? Try scheduling a pod on node01 and check ip route output
> k run busybox --image=busybox --dry-run=client -o yaml -- sleep 1000 > busybox.yaml
> vi busybox.yaml (spec: nodeName: node01 추가)
> k apply -f busybox.yaml
> k exec busybox -- ip route
14. What is the range of IP addresses configured for PODs on this cluster?
> k get all --all-namespaces
> k logs pod/weave-net-p842k -n kube-system
15. What is the IP Range configured for the services within the cluster?
> cd /etc/kubenetes/manifests/
> cat kube-apiserver.yaml
16. what type of proxy is the kube-proxy configured to use?
> k logs kube-proxy-sj8ln -n kube-system
17. How does this Kubernetes cluster ensure that a kube-proxy pod runs on all nodes in the cluster? Inspect the kube-proxy pods and try to identify how they are deployed.
> k get all --all-namespaces
18. What is the name of the service created for accessing CoreDNS?
> k get svc -n kube-system
19. Where is the configuration file located for configuring the CoreDNS service?
> /etc/coredns/Corefile
20. We have deployed a set of PODs and Services in the default and payroll namespaces. Inspect them and go to the next question.
> k get configmap -n kube-system
> k describe configmap coredns -n kube-system
21. From the hr pod nslookup the mysql service and redirect the output to a file /root/CKA/nslookup.out
> k exec hr -- nslookup mysql.payroll > /root/CKA/nslookup.out