在部署nginx镜像的时候，没有拉到nginx镜像，怎么用解决这个问题，不好意思，k8s，我真的是零基础 [root@k8s-master ~]# kubectl get pod NAME READY STATUS RESTARTS AGE nginx-deployment-kc-7c9b7fbfc7-5xdbk 0/1 ImagePullBackOff 0 7m49s nginx-deployment-kc-7c9b7fbfc7-f4kqc 0/1 ImagePullBackOff 0 7m49s nginx-deployment-kc-7c9b7fbfc7-l7lfd 0/1 ImagePullBackOff 0 7m49s