1. Question Use context: k config use-context k8s-c2-AC The cluster admin asked you to find out the following information about etcd runngin on cluster2-controlplane1: Server private key location Server certificate expiration date Is client certificate authentication enabled Write these information into /opt/course/p1/etcd-info.txt Finally you’re asked to save an etcd snapshot at /etc/etcd-snapshot.db on cluster2-controlplane1 and display its status Answer Find out etcd information check the nodes: 1 2 3 4 5 6 7 k get nodes NAME STATUS ROLES AGE VERSION cluster2-controlplane1 Ready control-plane 89m v1.

1. Question Create a new ServiceAccount with the name pvviewer. Grant this ServiceAccount access to list all PersistentVolumes in the cluster by creating an appropriate ClusterRole called pvviewer-role and ClusterRoleBinding called pvviewer-role-binding. Next, create a pod called pvviewer with the image: redis and serviceAccount: pvviewer in the default namespace. Answer Pods authenticate to the API Server using ServiceAccounts. If the serviceAccount name is not specified, the default service account for the namespace is used during a pod creation.

1. Question Take a backup of the etcd cluster and save it to /opt/etcd-backup.db. Answer 1 2 3 export ETCDCTL_API=3 etcdctl snapshot save --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key /opt/etcd-backup.db 2. Question Create a Pod called redis-storage with image: redis:alpine with a Volume of type emptyDir that lasts for the life of the Pod. Pod named ‘redis-storage’ created Pod ‘redis-storage’ uses Volume type of emptyDir Pod ‘redis-storage’ uses volumeMount with mountPath = /data/redis

1. Question Deploy a pod named nginx-pod using the nginx-alpine image Answer 1 k run nginx-pod --image=nginx:alpine 2. Question Deploy a messagine pod using the redis:alpine image with the labels set to tier=msg Answer 1 k run messaging --image=redis:alpine -l tier=msg 3. Question Create a namespace named apx-x9984574 Answer 1 k create namespace apx-x9984574 4. Question Get the list of nodes in JSON format and store it in a file at /opt/outputs/nodes-z3444kd9.

Introduction Jobs: 스파크 애플리케이션의 모든 job에 대한 요약 정보 Stages: 모든 jobs의 모든 stages의 현재 상태 요약 정보 Storage: persisted RDD와 DataFrame 정보 제공 Environment: 다양한 환경 변수 값 Executors: 애플리케이션을 위해 생성된 Executer 정보 제공. 메모리와 디스크 사용량과 task, shuffle 정보 등 SQL: 애플리케이션이 Spark SQL 쿼리 실행 시 정보 제공 Streaming: Streaming jobs 실행 시 정보 제공 애플리케이션 실행 1 2 3 4 5 df = spark.read.format("csv") \ .