How to limit access to Job Tracker and Name node in Hadoop.

Hadoop provides properties that can be used to create an include or exclude list of hosts that are allowed to access Job Tracker and Name node.

Property to to create an include list of hosts for JobTracker in file mapred-site.xml
<property>

  <name>mapred.hosts</name>

  <value></value>

  <description>Names a file that contains the list of nodes that may

  connect to the jobtracker.  If the value is empty, all hosts are

  permitted.</description>

</property>

Property to to create an exclude list of hosts for JobTracker in file mapred-site.xml

<property>

  <name>mapred.hosts.exclude</name>

  <value></value>

  <description>Names a file that contains the list of hosts that

  should be excluded by the jobtracker.  If the value is empty, no

  hosts are excluded.</description>

</property>

Property to to create an include list of hosts for NameNode in file hdfs-site.xml
<property>

  <name>dfs.hosts</name>

  <value></value>

  <description>Names a file that contains a list of hosts that are

  permitted to connect to the namenode. The full pathname of the file

  must be specified.  If the value is empty, all hosts are

  permitted.</description>

</property>

Property to to create an exclude list of hosts for NameNode in file hdfs-site.xml

<property>

  <name>dfs.hosts.exclude</name>

  <value></value>

  <description>Names a file that contains a list of hosts that are

  not permitted to connect to the namenode.  The full pathname of the

  file must be specified.  If the value is empty, no hosts are

  excluded.</description>

</property>