add zookeeper

zookeeper/README.md

@@ -0,0 +1,40 @@
+zookeeper
+=========
+
+![](http://zookeeper.apache.org/images/zookeeper_small.gif)
+
+Apache [ZooKeeper][1] is an effort to develop and maintain an open-source server
+which enables highly reliable distributed coordination.
+
+
+## docker-compose.yml
+
+```yaml
+zookeeper:
+  image: zookeeper
+  ports:
+    - "2181:2181"
+  volumes:
+    - ./data:/data
+    - ./datalog:/datalog
+  restart: always
+```
+
+## Standalone Mode
+
+```bash
+$ docker-compose up -d
+$ docker-compose exec zookeeper zkCli.sh
+>>> help
+>>> create /hello world
+>>> get /hello
+>>> delete /hello
+>>> quit
+```
+
+Click [this][2] to learn more.
+
+## Cluster Mode [TODO]
+
+[1]: http://zookeeper.apache.org/
+[2]: https://zookeeper.apache.org/doc/trunk/zookeeperStarted.html