3.3. Deploy Hue with an HA Cluster

If you are going to use Hue with an HA Cluster, make the following changes to /etc/hue/conf/hue.ini:

Install the Hadoop HttpFS component on the Hue server.
For RHEL/CentOS/Oracle Linux:
```
 yum install hadoop-httpfs
```
For SLES:
```
zypper install hadoop-httpfs
```

Modify /etc/hadoop-httpfs/conf/httpfs-site.xml to configure HttpFS to talk to the cluster by confirming the following properties are correct:

<property>
  <name>httpfs.proxyuser.hue.hosts</name>
  <value>*</value>
</property>
<property>
  <name>httpfs.proxyuser.hue.groups</name>
  <value>*</value>
</property>

Start the HttpFS service.
```
service hadoop-httpfs start
```
Modify the core-site.xml file. On the NameNodes and all the DataNodes, add the following properties to the $HADOOP_CONF_DIR /core-site.xml file. Where $HADOOP_CONF_DIR is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.
```
<property>
  <name>hadoop.proxyuser.httpfs.groups</name>
  <value>*</value>
</property>
<property>
  <name>hadoop.proxyuser.httpfs.hosts</name>
  <value>*</value>
</property>
```

In the hue.ini file, under the [hadoop][[hdfs_clusters]][[[default]]] sub-section, use the following variables to configure the cluster:

Table 6.1. Hue Configuration Properties

Property	Description	Example
fs_defaultfs	NameNode URL using the logical name for the new name service. For reference, this is the dfs.nameservices property in hdfs-site.xml in your Hadoop configuration.	hdfs://mycluster
webhdfs_url	URL to the HttpFS server.	http://c6401.apache.org:14000/webhdfs/v1/

Restart Hue for the changes to take effect.
```
service hue restart 
```

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