Merge pull request kahun#132 from yimeng/master

add zookeeper etcd serf consul

README.md

@@ -101,6 +101,11 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 * [Overcast](http://andrewchilds.github.io/overcast/) - Deploy VMs across different cloud providers, and run commands and scripts across any or all of them in parallel via SSH.
 * [Rundeck](http://rundeck.org/) - Simple orchestration tool.
 * [Salt](http://www.saltstack.com/) - It's written in Python.
+* [serf](http://www.serfdom.io/) - Serf is a tool for cluster membership 
+* [consul](http://www.consul.io/) - It is a tool for discovering and configuring services in your infrastructure.
+* [zookeeper](http://zookeeper.apache.org/) - ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.
+* [etcd](https://github.com/coreos/etcd) - A highly-available key value store for shared configuration and service discovery
+* [doozerd](https://github.com/ha/doozerd) - Doozer is a highly-available, completely consistent store for small amounts of extremely important data. 
 
 ## Cloud Storage