k8s1.26 controller noready
https://blog.csdn.net/zhonglinzhang/article/details/77767847
https://www.cnblogs.com/xingyys/p/11574597.html
https://github.com/Kevin-fqh/learning-k8s-source-code/blob/master/kubelet/(05)kubelet资源上报&Evition机制.md
https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/
https://imroc.cc/kubernetes/best-practices/graceful-shutdown/prestop
https://www.alibabacloud.com/help/en/ack/ack-managed-and-ack-dedicated/user-guide/dns-troubleshooting-1