Improved Docker Support (#247)

The addition of a proper local volume mapping for Elasticsearch and MySQL ensures developers don't lose data between runs of the containers.

.gitignore

@@ -85,3 +85,4 @@ private.py
 docs/_build/
 course_discovery/static/bower_components/
 node_modules/
+docker/volumes/

docker-compose.yml

@@ -12,12 +12,14 @@ services:
       MYSQL_DATABASE: "discovery"
     ports:
       - "3306:3306"
+    volumes:
+      - ./docker/volumes/db:/var/lib/mysql
 
   es:
     image: elasticsearch:1.5.2
     container_name: es
     volumes:
-      - /tmp/elasticsearch/data:/es-data
+      - ./docker/volumes/es:/es-data
     ports:
       - "9200:9200"
       - "9300:9300"

docker/volumes/.keep

+This directory contains the data volumes for the Docker container. The contents of this directory are ignored by Git.