Datanode process not running in Hadoop

Question

I set up and configured a multi-node Hadoop cluster using this tutorial.

When I type in the start-all.sh command, it shows all the processes initializing properly as

Answer 1

1. I configured hadoop.tmp.dir in conf/core-site.xml

2. I configured dfs.data.dir in conf/hdfs-site.xml

3. I configured dfs.name.dir in conf/hdfs-site.xml

4. Deleted everything under "/tmp/hadoop-/" directory

5. Changed file permissions from 777 to 755 for directory listed under dfs.data.dir

   And the data node started working.