Chapter 12. WebHDFS Administrator Guide

Use the following instructions to set upo WebHDFS:

Set up WebHDFS.

Add the following property to the hdfs-site.xml file:

<property>
   <name>dfs.webhdfs.enabled</name>
   <value>true</value>
</property>

[Optional] - If running a secure cluster, follow the steps listed below.
1. 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
2. Create keytab files for the HTTP principals.
```
kadmin: xst -norandkey -k /etc/security/spnego.service.keytab HTTP/$<Fully_Qualified_Domain_Name>
```
3. Verify that the keytab file and the principal are associated with the correct service.
```
klist –k -t /etc/security/spnego.service.keytab
```
4. Add the following properties to the hdfs-site.xml file.
```
<property>
   <name>dfs.web.authentication.kerberos.principal</name>
   <value>HTTP/$<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 instructions provided here.