Zabbix Documentation 5.4

Sidebar

2 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. The amount of memory allocated for the connection depends on the 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 (see database size section of this page for details). It is highly recommended to run the database on a separate box for large installations.

Supported platforms

Due to security requirements and the mission-critical nature of the monitoring server, UNIX is the only operating system that can consistently deliver the necessary performance, fault tolerance, and resilience. Zabbix operates on market-leading versions.

Zabbix components are available and tested for the following platforms:

Platform Server Agent Agent2
Linux x x x
IBM AIX x x -
FreeBSD x x -
NetBSD x x -
OpenBSD x x -
HP-UX x x -
Mac OS X x x -
Solaris x x -
Windows - x x

Zabbix server/agent may work on other Unix-like operating systems as well. Zabbix agent is supported on all Windows desktop and server versions since XP.

Zabbix disables core dumps if compiled with encryption and does not start if the system does not allow disabling of core dumps.

Required software

Zabbix is built around modern web servers, leading database engines, and PHP scripting language.

Database management system
Software Supported versions* Recommended version Comments
MySQL/Percona 5.7.28-8.0.X 8.0.X Required if MySQL (or Percona) is used as Zabbix backend database. InnoDB engine is required. We recommend using the MariaDB Connector/C library for building server/proxy.
MariaDB 10.0.37-10.6.X 10.5.X InnoDB engine is required. We recommend using the MariaDB Connector/C library for building server/proxy.
Oracle 12.1.0.2 - 19c 19c Required if Oracle is used as Zabbix backend database.
PostgreSQL without partitioning 10.9-13.X 12.X.X or newer Required if PostgreSQL is used as Zabbix backend database.
PostgreSQL with partitioning 10.9-13.X 13.X.X Required if PostgreSQL is used as Zabbix backend database.
Please note, that PostgreSQL versions below 13.0.0 may have issues handling operations that involve many partitions. Though some of the issues have been resolved in version 12, version 13 offers better performance.
PostgreSQL with TimescaleDB Timescale DB 1.5-2.1 PostgreSQL 12 with TimescaleDB 1.7/2.0
or
PostgreSQL 13.2 or newer with TimescaleDB 2.1
Required if TimescaleDB is used as Zabbix backend database. Make sure to install the distribution of TimescaleDB with the compression supported.
SQLite 3.3.5-3.34.X 3.3X.X SQLite is only supported with Zabbix proxies. Required if SQLite is used as Zabbix proxy database.

** * ** Though Zabbix will work with the minimum supported version, some of these database versions are outdated and no longer supported by the database developers. Please consider upgrading to the recommended version to achieve the best performance, stability, and reliability.

Although Zabbix can work with databases available in the operating systems, for the best experience, we recommend using databases installed from the official database developer repositories.

Frontend

The minimum supported screen width for Zabbix frontend is 1200px.

Software Version Comments
Apache 1.3.12 or later
PHP 7.2.5 or later PHP 8.0 is not supported.
PHP extensions:
gd 2.0.28 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, 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.
openssl php-openssl. Required only if SAML authentication is used in the frontend.
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.

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

For other fonts than the default DejaVu, PHP function imagerotate might be required. If it is missing, these fonts might be rendered incorrectly when a graph is displayed. This function is only available if PHP is compiled with bundled GD, which is not the case in Debian and other distributions.

Web browser on client side

Cookies and JavaScript must be enabled.

The latest stable versions of Google Chrome, Mozilla Firefox, Microsoft Edge, Apple Safari, and Opera are supported.

The same-origin policy for IFrames is implemented, which means that Zabbix cannot be placed in frames on a different domain.

Still, pages placed into a Zabbix frame will have access to Zabbix frontend (through JavaScript) if the page that is placed in the frame and Zabbix frontend are on the same domain. A page like http://secure-zabbix.com/cms/page.html, if placed into dashboards on http://secure-zabbix.com/zabbix/, will have full JS access to Zabbix.

Server

Mandatory requirements are needed always. Optional requirements are needed for the support of the specific function.

Requirement Status Description
libpcre Mandatory PCRE library is required for Perl Compatible Regular Expression (PCRE) support.
The naming may differ depending on the GNU/Linux distribution, for example 'libpcre3' or 'libpcre1'. Note that you need exactly PCRE (v8.x); PCRE2 (v10.x) library is not used.
libevent Required for bulk metric support and IPMI monitoring. Version 1.4 or higher.
Note that for Zabbix proxy this requirement is optional; it is needed for IPMI monitoring support.
libpthread Required for mutex and read-write lock support.
zlib Required for compression support.
OpenIPMI Optional Required for IPMI support.
libssh2 or libssh Required for SSH checks. Version 1.0 or higher (libssh2); 0.6.0 or higher (libssh).
libssh is supported since Zabbix 4.4.6.
fping Required for ICMP ping items.
libcurl Required for web monitoring, VMware monitoring, SMTP authentication, web.page.* Zabbix agent items, HTTP agent items and Elasticsearch (if used). Version 7.28.0 or higher is recommended.
Libcurl version requirements:
- SMTP authentication: version 7.20.0 or higher
- Elasticsearch: version 7.28.0 or higher
libxml2 Required for VMware monitoring and XML XPath preprocessing.
net-snmp Required for SNMP support. Version 5.3.0 or higher.
GnuTLS, OpenSSL or LibreSSL Required when using encryption.
Agent
Requirement Status Description
libpcre Mandatory PCRE library is required for Perl Compatible Regular Expression (PCRE) support.
The naming may differ depending on the GNU/Linux distribution, for example 'libpcre3' or 'libpcre1'. Note that you need exactly PCRE (v8.x); PCRE2 (v10.x) library is not used.
GnuTLS, OpenSSL or LibreSSL Optional Required when using encryption.
On Microsoft Windows systems OpenSSL 1.1.1 or later is required.

Starting from version 5.0.3, Zabbix agent will not work on AIX platforms below versions 6.1 TL07 / AIX 7.1 TL01.

Agent 2
Requirement Status Description
libpcre Mandatory PCRE library is required for Perl Compatible Regular Expression (PCRE) support.
The naming may differ depending on the GNU/Linux distribution, for example 'libpcre3' or 'libpcre1'. Note that you need exactly PCRE (v8.x); PCRE2 (v10.x) library is not used.
OpenSSL Optional Required when using encryption.
OpenSSL 1.0.1 or later is required on UNIX platforms.
The OpenSSL library must have PSK support enabled. LibreSSL is not supported.
On Microsoft Windows systems OpenSSL 1.1.1 or later is required.
Java gateway

If you obtained Zabbix from the source repository or an archive, then the necessary dependencies are already included in the source tree.

If you obtained Zabbix from your distribution's package, then the necessary dependencies are already provided by the packaging system.

In both cases above, the software is ready to be used and no additional downloads are necessary.

If, however, you wish to provide your versions of these dependencies (for instance, if you are preparing a package for some Linux distribution), below is the list of library versions that Java gateway is known to work with. Zabbix may work with other versions of these libraries, too.

The following table lists JAR files that are currently bundled with Java gateway in the original code:

Library License Website Comments
logback-core-1.2.3.jar EPL 1.0, LGPL 2.1 http://logback.qos.ch/ Tested with 0.9.27, 1.0.13, 1.1.1 and 1.2.3.
logback-classic-1.2.3.jar EPL 1.0, LGPL 2.1 http://logback.qos.ch/ Tested with 0.9.27, 1.0.13, 1.1.1 and 1.2.3.
slf4j-api-1.7.30.jar MIT License http://www.slf4j.org/ Tested with 1.6.1, 1.6.6, 1.7.6 and 1.7.30.
android-json-4.3_r3.1.jar Apache License 2.0 https://android.googlesource.com/platform/libcore/+/master/json Tested with 2.3.3_r1.1 and 4.3_r3.1. See src/zabbix_java/lib/README for instructions on creating a JAR file.

Java gateway can be built using either Oracle Java or open-source OpenJDK (version 1.6 or newer). Packages provided by Zabbix are compiled using OpenJDK. The table below provides information about OpenJDK versions used for building Zabbix packages by distribution:

Distribution OpenJDK version
RHEL/CentOS 8 1.8.0
RHEL/CentOS 7 1.8.0
SLES 15 11.0.4
SLES 12 1.8.0
Debian 10 11.0.8
Ubuntu 20.04 11.0.8
Ubuntu 18.04 11.0.8

Database size

Zabbix configuration data require a fixed amount of disk space and do not grow much.

Zabbix database size mainly depends on these variables, which define the amount of stored historical data:

  • Number of processed values per second

This is the average number of new values Zabbix server receives every second. For example, if we have 3000 items for monitoring with a refresh rate of 60 seconds, the number of values per second is calculated as 3000/60 = 50.

It means that 50 new values are added to Zabbix database every second.

  • Housekeeper settings for history

Zabbix keeps values for a fixed period of time, normally several weeks or months. Each new value requires a certain amount of disk space for data and index.

So, if we would like to keep 30 days of history and we receive 50 values per second, the total number of values will be around (30*24*3600)* 50 = 129.600.000, or about 130M of values.

Depending on the database engine used, type of received values (floats, integers, strings, log files, etc), the disk space for keeping a single value may vary from 40 bytes to hundreds of bytes. Normally it is around 90 bytes per value for numeric items2. In our case, it means that 130M of values will require 130M * 90 bytes = 10.9GB of disk space.

The size of text/log item values is impossible to predict exactly, but you may expect around 500 bytes per value.

  • Housekeeper setting for trends

Zabbix keeps a 1-hour max/min/avg/count set of values for each item in the table trends. The data is used for trending and long period graphs. The one hour period can not be customized.

Zabbix database, depending on the database type, requires about 90 bytes per each total. Suppose we would like to keep trend data for 5 years. Values for 3000 items will require 3000*24*365* 90 = 2.2GB per year, or 11GB for 5 years.

  • Housekeeper settings for events

Each Zabbix event requires approximately 250 bytes of disk space1. It is hard to estimate the number of events generated by Zabbix daily. In the worst-case scenario, we may assume that Zabbix generates one event per second.

For each recovered event, an event_recovery record is created. Normally most of the events will be recovered so we can assume one event_recovery record per event. That means additional 80 bytes per event.

Optionally events can have tags, each tag record requiring approximately 100 bytes of disk space1. The number of tags per event (#tags) depends on configuration. So each will need an additional #tags * 100 bytes of disk space.

It means that if we want to keep 3 years of events, this would require 3*365*24*3600* (250+80+#tags*100) = ~30GB+#tags*100B disk space2.

1 More when having non-ASCII event names, tags and values.

2 The size approximations are based on MySQL and might be different for other databases.

The table contains formulas that can be used to calculate the disk space required for Zabbix system:

Parameter Formula for required disk space (in bytes)
Zabbix configuration Fixed size. Normally 10MB or less.
History days*(items/refresh rate)*24*3600*bytes
items : number of items
days : number of days to keep history
refresh rate : average refresh rate of items
bytes : number of bytes required to keep single value, depends on database engine, normally ~90 bytes.
Trends days*(items/3600)*24*3600*bytes
items : number of items
days : number of days to keep history
bytes : number of bytes required to keep single trend, depends on the database engine, normally ~90 bytes.
Events days*events*24*3600*bytes
events : number of event per second. One (1) event per second in worst-case scenario.
days : number of days to keep history
bytes : number of bytes required to keep single trend, depends on the database engine, normally ~330 + average number of tags per event * 100 bytes.

So, the total required disk space can be calculated as:
Configuration + History + Trends + Events
The disk space will NOT be used immediately after Zabbix installation. Database size will grow then it will stop growing at some point, which depends on housekeeper settings.

Time synchronization

It is very important to have precise system time on the server with Zabbix running. ntpd is the most popular daemon that synchronizes the host's time with the time of other machines. It's strongly recommended to maintain synchronized system time on all systems Zabbix components are running on.