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=8440
secured_url_port=8441

Start the agent. The agent registers with the Server on start.

ambari-agent start