Install zabbix agent on RHEL 7
# rpm -ivh https://repo.zabbix.com/zabbix/4.0/rhel/7/x86_64/zabbix-release-4.0-1.el7.noarch.rpm
Install zabbix agent
# yum install zabbix-agent
Start zabbix agent
# service zabbix-agent start
Open firewall port 10050/tcp
# firewall-cmd --zone=public --permanent --add-port=10050/tcp