Hardware & Software requirements

Minimum Hardware requirements

Your needs			Our recommendation
Ticket created per month	Console Users	CMDB: CIs	Servers	CPU	Memory	Disk for MySQL
< 200	< 20	< 50k	An all in one server	2vCPU	4Gb	10Gb
< 5000	< 50	< 200k	Two servers: Web + MySQL	4vCPU	8Gb	20Gb
> 5000	> 50	> 200k	Two servers: Web + MySQL	8vCPU	16Gb	50Gb

The minimum screen size for using iTop is 1024*768 pixels, but the higher resolution the better.

We recommend to use virtual machines running Debian 9 or Ubuntu 20.04 LTS

iTop compatibility list

iTop	Min required → Max supported			Known Limitations
iTop	PHP	MySQL	MariaDB	Known Limitations
2.3.x	5.3.6	5.0
2.4.x	5.3.6	5.5.3
2.5.x	5.3.6	5.5.3	5.5
2.6.0 2.6.1+	5.6 → *7.2* 5.6 → *7.3*	5.6	10.1	MySQL 8 not working, PHP 7.4 not working PHP 7.3 supported from 2.6.1
2.7.x 2.7.7 - 2.7.8	7.0.8 → *7.4* 7.1.3 → 7.4	5.6 → 5.7	10.1 → 10.4	MySQL 8 supported (not recommended for large databases !), PHP 7.4 recommanded IE9 no more supported PHP 5.6 and 7.0.8 can work but not with all extensions PHP 7.1.3 min is required if you use oAuth2 or extension Brute Force Protection
2.7.9+	7.1.3 → *7.4*	5.6 → 5.7	10.1 → 10.6	PHP 7.1.3 min is required
3.0.x 3.0.2	7.1.3 → 7.4 7.1.3 → *8.0*	5.7+	10.3 → 10.6	MariaDB is now preferred to MySQL IE11 no more supported PHP 8.0 supported only since 3.0.2 PHP 8.1+ not supported
3.1.x	7.4 → *8.1*	5.7+	10.3.7 → 10.6	PHP 8.1 supported
3.2.x	8.1 → 8.3	5.7+	10.3.7 → 10.11

Legend:

in bold: when the min or max version has changed since the previous iTop version
in italique: the highest version supported, when it is known

Web browser

Latest version of Chrome is recommended (Firefox is safe too).

Since 2.7.0, IE9 is no more supported
Since 3.0.0, IE11 is no more supported
Following versions of iTop will no longer supports any Internet Explorer versions

Web Server

Configuring your webserver

Apache Httpd: iTop packages contains built-in configuration for Apache Httpd (.htaccess files). Read more here : iTop and Apache HTTPD
Microsoft IIS: iTop packages contains built-in configuration for Microsoft IIS (web.config files). Read more here : iTop and IIS
NGINX: To configure NGINX properly, take a look at this dedicated web page : iTop and NGINX
Suhosin: iTop and Suhosin
SELinux: iTop and SE Linux

GraphViz

iTop relies on Graphviz to produce graphical representations of the object's life-cycle as well as the impact analysis graph.

On Linux, graphviz is already part of the prerequisites defined above, so there is nothing additional to do.
On Windows: download Graphviz from the web site and install it.

You will be prompted to supply the exact path to Graphviz during the setup. The expected value is the the full path to the dot executable (named dot.exe on Windows). For example :

Linux: /user/bin/dot
Windows: C:\Program files (x86)\Graphviz 2.68\bin\dot.exe

DB Server

To select a database version, check MariaDB release notes by version and MySQL Documentation

MySQL 8 : although iTop supports this DB server since its 2.7.0 version, we recommend not to use it !
Indeed the query cache functionality was removed in MySQL 8, and this causes bad performances.

Galera clusters with multiple masters are NOT supported by iTop, because such clusters do not properly implement the GET_LOCK MySQL function (for more information: Galera cluster known limitations).

Some old MariaDB versions contains a bug that forbids iTop backup. See below !

MariaDB incompatibilities with iTop backup

With the following versions of MariaDB, iTop backup won't work:

10.5.x	10.4.x	10.3.x	10.2.x
10.5.7	10.4.16	10.3.26	10.2.35
10.5.8	10.4.17	10.3.27	10.2.36

The symptoms

When you perform this query:

MariaDB [sbacmdb]> select * from view_DBServer;

You get this error:

Error: Failed to execute mysqldump: mysqldump: Couldn't execute 'show create table `view_DBServer`': You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '= 0 and `SoftwareLicence_softwarelicence_id_Licence`.`end_date` < date_format...' at line 1 (1064)

Root cause: This is a MariaDB issue, which was fixed in the following minor version.

Strategy: avoid those buggy MariaDB versions. Downgrade to a not impacted version or upgrade to the fixed versions:

10.5.9	10.4.18	10.3.28	10.2.37

Workaround

Drop Views before doing Backup, Views are not required by iTop itself.
Cautious, a Setup will recreate the Views, so drop them again after that.

Views will be totally removed in 3.0, an optional free extension will be proposed for those still using them

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