https://community.cloudera.com/t5/Support-Questions/Unable-to-start-Namenode/m-p/213641#M175565 <P>First you need to know the error.</P><P>- Check your namenode log file, by default located in the following directory <STRONG>/var/log/hadoop/hdfs</STRONG></P><P>run <STRONG>tail -f /var/log/hadoop/hdfs/</STRONG><STRONG>hadoop-hdfs-namenode*.log</STRONG> . and try to start the service again.</P><P><STRONG> </STRONG>- Check if namenode process was already running on that node with <B>ps -ef | grep namenode</B></P><P><STRONG><BR /></STRONG></P> Fri, 01 Jun 2018 04:11:35 GMT HernanFernande 2018-06-01T04:11:35Z