2. Configuring DataNode SASL

Use the following steps to configure DataNode SASL to securely run a DataNode as a non-root user:

1. Shut Down the DataNode

Shut down the DataNode using the applicable commands in the Controlling HDP Services Manually section of the HDP Reference Guide.

2. Enable SASL

Configure the following properties in the /etc/hadoop/conf/hdfs-site.xml file to enable DataNode SASL.

The dfs.data.transfer.protection property enables DataNode SASL. You can set this property to one of the following values:

authentication -- Establishes mutual authentication between the client and the server.
integrity -- in addition to authentication, it guarantees that a man-in-the-middle cannot tamper with messages exchanged between the client and the server.
privacy -- in addition to the features offered by authentication and integrity, it also fully encrypts the messages exchanged between the client and the server.

In addition to setting a value for the dfs.data.transfer.protection property, you must set the dfs.http.policy property to HTTPS_ONLY. You must also specify ports for the DataNode RPC and HTTP Servers.

	Note
	For more information on configuring SSL, see "Enable SSL on HDP Components" in the HDP Security Guide.

For example:

<property>
 <name>dfs.data.transfer.protection</name>
 <value>integrity</value>
</property>
 
<property>
 <name>dfs.datanode.address</name>
 <value>0.0.0.0:10019</value>
</property>
 
<property>
 <name>dfs.datanode.http.address</name>
 <value>0.0.0.0:10022</value>
</property>
 
<property>
 <name>dfs.http.policy</name>
 <value>HTTPS_ONLY</value>
</property>

Note

If you are already using the following encryption setting:

dfs.encrypt.data.transfer=true

This is similar to:

dfs.data.transfer.protection=privacy

These two settings are mutually exclusive, so you should not have both of them set. However, if both are set, dfs.encrypt.data.transfer will not be used.

3. Update Environment Settings

Edit the following setting in the /etc/hadoop/conf/hadoop-env.sh file, as shown below:

#On secure datanodes, user to run the datanode as after dropping privileges
export HADOOP_SECURE_DN_USER=

The export HADOOP_SECURE_DN_USER=hdfs line enables the legacy security configuration, and must be set to an empty value in order for SASL to be enabled.

4. Start the DataNode

Start the DataNode services using the applicable commands in the Controlling HDP Services Manually section of the HDP Reference Guide.

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