Zabbix System Requirements

Hardware

Memory

Zabbix requires both physical and disk memory. 128 MB of physical memory and 256 MB of free disk space could be a good starting point. However, the amount of required disk memory obviously depends on the number of hosts and parameters that are being monitored. If you’re planning to keep a long history of monitored parameters, you should be thinking of at least a couple of gigabytes to have enough space to store the history in the database. Each Zabbix daemon process requires several connections to a database server. Amount of memory allocated for the connection depends on configuration of the database engine.

The more physical memory you have, the faster the database (and therefore Zabbix) works!

CPU

Zabbix and especially Zabbix database may require significant CPU resources depending on number of monitored parameters and chosen database engine.

Other hardware

A serial communication port and a serial GSM modem are required for using SMS notification support in Zabbix. USB-to-serial converter will also work.

Examples of hardware configuration

The table provides several examples of hardware configurations:

Name	Platform	CPU/Memory	Database	Monitored hosts
Small	CentOS	Virtual Appliance	MySQL InnoDB	100
Medium	CentOS	2 CPU cores/2GB	MySQL InnoDB	500
Large	RedHat Enterprise Linux	4 CPU cores/8GB	RAID10 MySQL InnoDB or PostgreSQL	>1000
Very large	RedHat Enterprise Linux	8 CPU cores/16GB	Fast RAID10 MySQL InnoDB or PostgreSQL	>10000

Actual configuration depends on the number of active items and refresh rates very much. It is highly recommended to run the database on a separate box for large installations.

Software

Zabbix is built around a modern Apache web server, leading database engines, and PHP scripting language.

Database management system

Software	Version	Comments
MySQL	5.0.3 or later	Required if MySQL is used as Zabbix backend database. InnoDB engine is required. MariaDB is also known to work with Zabbix.
Oracle	10g or later	Required if Oracle is used as Zabbix backend database.
PostgreSQL	8.1 or later	Required if PostgreSQL is used as Zabbix backend database. It is suggested to use at least PostgreSQL 8.3, which introduced much better VACUUM performance.
SQLite	3.3.5 or later	Required if SQLite is used as Zabbix backend database.
IBM DB2	9.7 or later	Required if IBM DB2 is used as Zabbix backend database.

Frontend

The following software is required to run Zabbix frontend:

Software	Version	Comments
Apache	1.3.12 or later
PHP	5.4.0 or later	PHP v7 is not supported yet.
PHP extensions:
gd	2.0 or later	PHP GD extension must support PNG images (–with-png-dir), JPEG (–with-jpeg-dir) images and FreeType 2 (–with-freetype-dir).
bcmath		php-bcmath (–enable-bcmath)
ctype		php-ctype (–enable-ctype)
libXML	2.6.15 or later	php-xml or php5-dom, if provided as a separate package by the distributor.
xmlreader		php-xmlreader, if provided as a separate package by the distributor.
xmlwriter		php-xmlwriter, if provided as a separate package by the distributor.
session		php-session, if provided as a separate package by the distributor.
sockets		php-net-socket (–enable-sockets). Required for user script support.
mbstring		php-mbstring (–enable-mbstring)
gettext		php-gettext (–with-gettext). Required for translations to work.
ldap		php-ldap. Required only if LDAP authentication is used in the frontend.
ibm_db2		Required if IBM DB2 is used as Zabbix backend database.
mysqli		Required if MySQL is used as Zabbix backend database.
oci8		Required if Oracle is used as Zabbix backend database.
pgsql		Required if PostgreSQL is used as Zabbix backend database.
sqlite3		Required if SQLite is used as Zabbix backend database.

Zabbix may work on previous versions of Apache, MySQL, Oracle, and PostgreSQL as well.

However, the amount of required disk memory obviously depends on the number of hosts and parameters that are being monitored. If you’re planning to keep a long history of monitored parameters, you should be thinking of at least a couple of gigabytes to have enough space to store the history in the database. 

Source:https://www.zabbix.com/documentation/3.0/manual/installation/requirements