Smoke Test HDFS
Determine 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
Use the Namenode web UI and the Utilities menu to browse the file system.