brew cask install google-cloud-sdk
kubectl completion zsh source <(!!)
https://kubernetes.io/docs/tutorials/stateless-application/guestbook/
https://kubernetes.io/docs/tutorials/stateful-application/mysql-wordpress-persistent-volume/
https://kubernetes.io/docs/tutorials/stateful-application/cassandra/
https://cloud.google.com/kubernetes-engine/docs/concepts/persistent-volumes?hl=ko
https://github.com/nginxinc/kubernetes-ingress/tree/master/examples