Chapter 11. WebHDFS Administrator Guide

Use the following instructions to set up WebHDFS:

Set up WebHDFS. Add the following property to the hdfs-site.xml file
```
<property>
  <name>dfs.webhdfs.enabled</name>
  <value>true</value> 
</property>
```
If running a secure cluster, follow the steps listed below.

Create an HTTP service user principal using the command given below:
```
kadmin: addprinc -randkey HTTP/$<Fully_Qualified_Domain_Name>@$<Realm_Name>.COM
```
where:
Create an HTTP service user principal using the command given below:
```
kadmin: addprinc -randkey HTTP/$<Fully_Qualified_Domain_Name>@$<Realm_Name>.COM
```
where:
- Fully_Qualified_Domain_Name: Host where NameNode is deployed
- Realm_Name: Name of your Kerberos realm

Create keytab files for the HTTP principals.

kadmin: xst -norandkey -k /etc/security/spnego.service.keytab HTTP/$<Fully_Qualified_Domain_Name>

Verify that the keytab file and the principal are associated with the correct service.
```
klist –k -t /etc/security/spnego.service.keytab
```

Add the following properties to the hdfs-site.xmlfile.

<property>
  <name>dfs.web.authentication.kerberos.principal</name>
  <value>HTTP/$<Fully_Qualified_Domain_Name>@$<Realm_Name>.COM</value>
</property>
<property>
  <name>dfs.web.authentication.kerberos.keytab</name>
  <value>/etc/security/spnego.service.keytab</value>
</property>

where:

Fully_Qualified_Domain_Name: Host where NameNode is deployed
Realm_Name: Name of your Kerberos realm

Restart the NameNode and DataNode services using the applicable commands in the "Controlling HDP Services Manually" section of Installing HDP Manually.

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