Chapter 3. Using Custom Host Names

You can customize the agent registration host name and the public host name used for  each host in Ambari. Use this capability when "hostname" does not return the public network host name for your machines.

To customize the name of each host in your cluster:

On the Install Options screen, select Perform Manual Registration for Ambari Agents.
Install the Agents manually, as described in Installing Ambari Agents Manually.
To echo the customized name of the host to which the Ambari agent registers, for every host, create a script like the following example, named  /var/lib/ambari-agent/hostname.sh. Be sure to chmod the script so it is executable by the Agent.
```
#!/bin/sh 
echo ambari_hostname
```
where ambari_hostname is the hostname to use for Agent registration
Open /etc/ambari-agent/conf/ambari-agent.ini on every host, using a text editor.
Add to the [agent] section the following line:
```
hostname_script=/var/lib/ambari-agent/hostname.sh
```
where/var/lib/ambari-agent/hostname.sh is the name of your custom echo script.
To generate a public host name for every host, create a script like the following example, named /var/lib/ambari-agent/public_hostname.sh to show the name for that host in the UI. Be sure to chmod the script so it is executable by the Agent.
```
#!/bin/sh
hostname -f
```
Open /etc/ambari-agent/conf/ambari-agent.ini on every host, using a text editor.

Add to the [agent] section the following line:

public_hostname_script=/var/lib/ambari-agent/public_hostname.sh

If applicable, add the host names to /etc/hosts on every host.
Restart the Agent for these changes to take effect.
```
ambari-agent restart
```

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