Install Zabbix agent on Centos 5.6

• get the rpms from here. In my case (x64 Centos) :

wget http://repo.andrewfarley.com/centos/5/x86_64/zabbix-1.8.3-1.x86_64.rpm
wget http://repo.andrewfarley.com/centos/5/x86_64/zabbix-agent-1.8.3-1.x86_64.rpm

• Install the dependencies :

yum install openssl-devel

• Install the rpms :

rpm -ivh zabbix-1.8.3-1.x86_64.rpm
rpm -ivh zabbix-agent-1.8.3-1.x86_64.rpm

• Edit your configuration file (at least to change the server IP) :

vi /etc/zabbix/zabbix_agentd.conf

• In my case I also had to change the PID file to /tmp/zabbix_agentd.pid
• Open the TCP port 10050 in your firewall settings
• Start the service :

/etc/init.d/zabbix-agentd restart

Source : http://andrewfarley.com/sysadmin/rpm-repository-online