1. RHEL/CentOS v. 5.x and 6.x

Install the EPEL repo.
```
yum install epel-release
```
Install the Ambari Agent
```
yum install ambari-agent
```

Configure the Ambari Agent by editing the ambari-agent.ini file.

vi /etc/ambari-agent/conf/ambari-agent.ini
                                    
[server]
hostname={your.ambari.server.hostname}
url_port=4080
secured_url_port=8443

Start the agent. The agent registers with the Server on start.
```
ambari-agent start
```