So I have this file in my server
#cloud-config
coreos:
etcd2:
# generate a new token for each unique cluster from https://discovery.etcd.io/new?size=3
discovery: "https://discovery.etcd.io/dd44e33e024fc8bddd309af7a88dcb50"
# multi-region and multi-cloud deployments need to use $public_ipv4
advertise-client-urls: "http://$public_ipv4:2379"