etcd
http://www.tuicool.com/articles/IfiqUn
http://www.infoq.com/cn/articles/etcd-interpretation-application-scenario-implement-principle
go etcd client https://github.com/coreos/etcd/tree/master/client
http://daizuozhuo.github.io/etcd-service-discovery/
很不错的文章 https://blog.gopheracademy.com/advent-2013/day-06-service-discovery-with-etcd/
API https://coreos.com/etcd/docs/latest/api.html
https://tonydeng.github.io/2015/11/24/etcd-the-first-using/
https://segmentfault.com/a/1190000003852735 集群中文说明
etcdctl
https://github.com/coreos/etcd/tree/master/etcdctl