Zabbix Appliance based on CentOS must have specified the following minimal/recommended requirements:
1. Netinstall - at least 1.5GB of RAM, because netinstall download install stage (size about 500MB).
2. Netinstall - DHCP;
3. Allocated resources for VM:
3.1. Disk - at least 8GB must be provided.
3.2. x86_64 arch supported only.