If data folder is shared as volume, it is neccesary format the datanode after run the container and before start hadoop services.

angelcervera · angelcervera · commit ac8e329455df · 2015-10-06T15:26:52.000+01:00
diff --git a/Dockerfile b/Dockerfile
@@ -146,7 +146,7 @@ EXPOSE 22
 
 
 ################### Expose volumes
-VOLUME ["/opt/hadoop/logs", "/var/lib/hadoop", "/root/shared"]
+VOLUME ["/opt/hadoop/logs", "/root/shared"]
 
 
 ################### Entry point
diff --git a/README.md b/README.md
@@ -30,7 +30,6 @@ If you want to execute a hadoop example, for example:
 mkdir /home/username/hadoop
 docker run --name my-new-hadoop-2.7.1 \
   -v /home/username/hadoop/logs:/opt/hadoop/logs \
-  -v /home/username/hadoop/data:/var/lib/hadoop \
   -v /home/username/hadoop/shared:/root/shared \
   -p 50070:50070 \
   -p 50075:50075 \
@@ -51,7 +50,7 @@ docker run --name my-new-hadoop-2.7.1 \
 After this, you will be inside of the hadoop docker container terminal.
 
 Basically:
-- Hadoop tmp folder (data folder) is in **/var/lib/hadoop** but you can access throw your mapped local folder **/home/username/hadoop/data**
+- Hadoop tmp folder (data folder) is in **/var/lib/hadoop**
 - Hadoop logs folder is in **/opt/hadoop/logs** but you can access throw your mapped local folder **/home/username/hadoop/logs**
 - Useful folder to share files: **/root/shared** mapped to your local folder **/home/username/hadoop/shared**
 - There is a big list of ports exposed, so you can map only ports that you are going to use or you can expose all replacing **-p local_port:exposed_port** by **-P** You can check the full list of ports in the [Dockfile](https://github.com/angelcervera/docker-hadoop/blob/master/Dockerfile)
