2. Smoke Test HDFS

First, see if you can reach the NameNode server with your browser:

http://$namenode.full.hostname:50070

Create the hdfs user directory in HDFS:

su $HDFS_USER
hdfs dfs -mkdir -p /user/hdfs

Try copying a file into HDFS and listing that file:

su $HDFS_USER
hdfs dfs -copyFromLocal /etc/passwd passwd 
hdfs dfs -ls

Test browsing HDFS:

http://$datanode.full.hostname:50075/browseDirectory.jsp?namenodeInfoPort=50070&dir=/&nnaddr=$namenode.full.hostname:8020