진짜 개어렵네 : https://seongjin.me/how-to-prepare-cka-exam/

https://killer.sh/attendee/81960fdc-0679-4335-840f-8240de820135/content

답지 : https://cdmana.com/2021/07/20210710201657708b.html

https://gengwg.blogspot.com/2022/02/cka-simulator-kubernetes-122.html

https://kubernetes.io/ko/docs/concepts/scheduling-eviction/taint-and-toleration/

https://kubernetes.io/docs/concepts/storage/persistent-volumes/

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-pv
spec:
  capacity:
    storage: 100Gi
  volumeMode: Filesystem
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage
  local:
    path: /mnt/disks/ssd1
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - example-node

kubectl config current-context

1. show node resoueces usage

$ kubectl top nodes
NAME                    CPU(cores)   CPU%      MEMORY(bytes)   MEMORY%   
cluster1-k8s-master-1   312m         15%       1362Mi          68%       
cluster1-k8s-node-1     124m         12%       233Mi           11%

https://kubernetes.io/ko/docs/reference/kubectl/cheatsheet/

• Run the kubectl top pod command and identify the pod that uses the most memory.
• k logs webapp-1
• Run the command kubectl edit deployment frontend  and modify the required field. Make sure to delete the properties of rollingUpdate as well, set at strategy.rollingUpdate .