Zabbix Respository

_rpm -Uvh https://repo.zabbix.com/zabbix/6.4/rhel/8/x86_64/zabbix-release-6.4-1.el8.noarch.rpm_

Switch DNF module version for PHP

 ** dnf module switch-to php:7.4

Install Zabbix server, frontend, agent

dnf install zabbix-server-mysql zabbix-web-mysql zabbix-apache-conf zabbix-sql-scripts zabbix-selinux-policy zabbix-agent

Error 

[FAILED] httpd-2.4.37-54.module_el8.8.0+1256+e1598b50.x86_64.rpm: No more mirrors to try - All mirrors were already tried without success

The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: Error downloading packages:
  httpd-2.4.37-54.module_el8.8.0+1256+e1598b50.x86_64: Cannot download, all mirrors were already tried without success