Update README.md

Author: sqshq

README.md

@@ -2,12 +2,13 @@
 **Ready to go Docker configuration for set up ELK stack in a minutes**
 
 ## Description
-
 - [Elasticsearch](https://hub.docker.com/_/elasticsearch/) - official image with data volume in `elasticsearch/data` directory
-- [Logstash](https://hub.docker.com/_/logstash/) - official image + custom configuration, which takes care about Filebeat, Topbeat and PacketBeat index templates for Elasticsearch + multiline option for stacktraces correct representation
+- [Logstash](https://hub.docker.com/_/logstash/) - official image + custom configuration which takes care about Filebeat, Topbeat and Packetbeat index templates for Elasticsearch + multiline option for correct stacktraces representation
 - [Kibana](https://hub.docker.com/_/kibana/) - official image
 - [Curator](https://github.com/elastic/curator) - lightweight 50mb container which could run scheduled tasks against Elasticsearch to manage its indices (delete, optimize, snapshot, etc)
 
+![scheme](https://cloud.githubusercontent.com/assets/6069066/13380670/550082e0-de59-11e5-98ff-a4b7a30ae719.png)
+
 ## Setup
 1. Install required Beats shippers on the host which should be monitored
 2. Install Docker and Docker Compose on the ELK host
@@ -24,7 +25,15 @@ Keep track of your containers execution. For example, controll Curator scheduled
 docker-compose logs curator
 ```
 
+## Scaling up
+This simple configuration will run very happily on your laptop, but it can be easely scaled up for highload production servers with a huge amount of logs and monitoring data.
+
+- Learn about [Elasticsearch cluster and horizontal scaling](https://www.elastic.co/guide/en/elasticsearch/guide/current/distributed-cluster.html)
+- Consider [Logstash scaling](https://www.elastic.co/guide/en/logstash/current/deploying-and-scaling.html) with multiple shipping and indexing instances with MQ in the middle
+
 ## Notes
-- You may want to add nginx container with HTTP Basic Auth config for Kibana
+- You may want to add [Kibana Shield plugin](https://www.elastic.co/guide/en/shield/current/kibana.html) for users authentication
+- It might be really helpful to use [Elasticsearch Watcher](https://www.elastic.co/products/watcher) or [Yelp ElastAlert](https://github.com/Yelp/elastalert) to get notified on significant events or anomalies in your data
 - You can specify resource limits (like CPU and memory allocation) for each docker container
-- Feel free to contact me with any questions and issues
+
+Feel free to contact me with any issues and questions