Execute these commands on the NameNode. Login as :
/usr/lib/hadoop/bin/hadoop namenode -format /usr/lib/hadoop/bin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start namenode
Execute these commands on the SecondaryNameNode. Login as
$HDFS_USER
:/usr/lib/hadoop/bin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start secondarynamenode
Execute these commands on all DataNodes. Login as
$HDFS_USER
:/usr/lib/hadoop/bin/hadoop-daemon.sh --config $HADOOP_CONF_DIR start datanode