Merge pull request #31 from jacobtomlinson/master

Fixing issue #30 with error "Storage directory /data/dfs/name does not exist" on Docker 1.9.1 on EC2.

Author: davidonlaptop

2.6.0/Dockerfile

@@ -37,7 +37,7 @@ RUN apt-get update && \
 COPY conf  $HADOOP_HOME/etc/hadoop/
 
 # Formatting HDFS
-RUN mkdir /data && \
+RUN mkdir -p /data/dfs/data /data/dfs/name /data/dfs/namesecondary && \
     hdfs namenode -format
 VOLUME /data