kubernetes 載入pod出現ErrImageNeverPull錯誤

1.使用kubectl get pod檢視pod狀態出現status為ErrImageNeverPull

NAME                                   READY   STATUS              RESTARTS   AGE
flaskapi-deployment-59bcb745ff-4x2d2   0/1     ErrImageNeverPull   0          3m58s
flaskapi-deployment-59bcb745ff-6mgqx   0/1     ErrImageNeverPull   0          3m58s
flaskapi-deployment-59bcb745ff-7xtgf   0/1     ErrImageNeverPull   0          3m58s

1. 使用kubectl describe pod <pod_name>檢視相應pod的狀態情況

   Name:         flaskapi-deployment-59bcb745ff-4x2d2
   Namespace:    default
   Priority:     0
   Node:         kmaster1/192.168.0.165
   Start Time:   Mon, 31 Oct 2022 11:23:41 -0400
   Labels:       app=flaskapi
              pod-template-hash=59bcb745ff
   Annotations:  <none>
   Status:       Pending
   IP:           10.244.1.24
   IPs:
   IP:           10.244.1.24
   Controlled By:  ReplicaSet/flaskapi-deployment-59bcb745ff
   Containers:
   flaskapi:
    Container ID:   
    Image:          flask-api
    Image ID:       
    Port:           5000/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       ErrImageNeverPull
    Ready:          False
    Restart Count:  0
    Environment:
      db_root_password:  <set to the key 'db_root_password' in secret 'flaskapi-secrets'>  Optional: false
      db_name:           flaskapi
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-nm6gp (ro)
   Conditions:
   Type              Status
   Initialized       True 
   Ready             False 
   ContainersReady   False 
   PodScheduled      True 
   Volumes:
   kube-api-access-nm6gp:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
   QoS Class:                   BestEffort
   Node-Selectors:              <none>
   Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
   Events:
   Type     Reason             Age                     From               Message
   ----     ------             ----                    ----               -------
   Normal   Scheduled          5m                      default-scheduler  Successfully assigned default/flaskapi-deployment-59bcb745ff-4x2d2 to kmaster1
   Warning  Failed             2m57s (x12 over 4m53s)  kubelet            Error: ErrImageNeverPull
   Warning  ErrImageNeverPull  2m44s (x13 over 4m53s)  kubelet            Container image "flask-api" is not present with pull policy of Never

   由此可以看出原因是pull本地的image出現了問題
2. 解決方案
   把deployment.yaml檔案中的imagePullPolicy: Never刪除掉就好了
   [References]: Error: ErrImageNeverPull

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