If EPEL is not set up already, it must be added. For RHEL/CentOS 7, the command is similar to this:
# rpm -Uvh http://ftp.colocall.net/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
For CentOS7 only, run the following command:
# yum install epel-release
Check the latest available version at https://fedoraproject.org/wiki/EPEL.
If you would like to check the available Zabbix versions in EPEL, it is possible with the next command:
# yum --disablerepo="*" --enablerepo="epel" search zabbix
Once the repository has been set up, you may install the packages (except the following is for 3.0 not for 4.0 as it was not available when this book was written):
# yum install zabbix30-agent zabbix30-dbfiles-mysql zabbix30-server-mysql zabbix30-web-mysql