This page describes required web server configuration that you need in order to install Kayako Classic Download.
Server software requirements
PHP PHP 5.5 and PHP 5.6 are recommended and supported by Kayako Classic.
Kayako will work with PHP 5.4, but you might face performance issues or potential bugs.
NOTE: PHP 7 is not yet supported. (Kayako Classic uses some 3rd party libraries which require earlier versions of PHP. We're working to update them.)
As of Kayako Classic 4.72, MySQL version 5.6.31 is the minimum requirement.
Important: There is a known bug with some MySQL versions which causes upgrades to fail with the following error:
Uncaught Exception Invalid SQL SELECT section. This bug has been fixed in the latest released MySQL versions 5.6.31 and 5.7.13. We recommend using the latest version of MySQL server to avoid any issues.
You can use any web server daemon – such as Apache, nginx, IIS – so long as it is fully compatible with the required PHP configuration (detailed below).
NOTE: If you're running Kayako Classic on a Linux server with SELinux, you'll need to configure it to permit Kayako Classic activities. If you're not familiar with SELinux, we recommend you disable it, as Kayako Classic will not function if it's configured incorrectly.
These settings are done in the PHP configuration file "php.ini" of the server on which you are installing the helpdesk.
- max_execution_time: "600"
- max_input_time: "600"
NOTE: This setting is not a part of standard 'php.ini'file supplied with PHP 5.4.x.
NOTE: This will vary – if you plan on using the Kayako Classic import tool, or if the web server is shared, a higher limit is required.
- output_buffering: "4096"
- file_uploads: "On"
- upload_max_filesize: "20M"
- post_max_size: "20M"
- max_file_uploads: "20"
- open_basedir: "Off"
- always_populate_raw_post_data: "-1"
If you have 'mod_security' installed on your apache web server, you must either disable it or whitelist your Kayako Classic files (so they are exempt from all 'mod_security' rules).
max_allowed_packet : should be 64M (Minimum)
PHP caches and accelerators
Kayako Classic accesses many scripts spread across many files for each connection. If you do not have a PHP cache, unless your web server is very finely tuned you will find the application to be less responsiveness.
Required PHP modules
Most of these modules are included by default. However, we have compiled a list of those which are definitely required by Kayako Classic for good measure:
- gd with Freetype support
- MySQLi (required for PHP 5.5)
- MySQLnd (required for PHP 5.5 and above)
Server hardware requirements/configuration changes
It is very difficult to quantify server hardware requirements for running Kayako Classic. Our customers run their helpdesks on a mix of dedicated hardware, shared hardware, and virtualized environments with restricted resource access.
Whichever environment you choose, assuming your database server will be run from the same hardware, the minimum hardware requirements for a small scale Kayako deployment installing Kayako are:
- 2 GB of RAM (allowing for operating system processes)
- 20 GB of hard disk space available for your helpdesk (realistically, you should allow more than this for future growth)
- Access to the equivalent of a 2 GHz CPU core
NOTE: For Linux operating system, SELinux must be disabled or set to permissive mode.
So, what's recommended?
What we use for Kayako Classic OnDemand
The web application element of Kayako Classic is platform independent, so the server requirements will remain the same for Windows as well as Unix/Linux servers. Which is best for you will depend on a variety of factors - including resources, expertise and what fits within your organization.
That said, we do have our own favorite configuration, which is in part used for our OnDemand platform:
||What we use
||It is well supported, secure, fast and easily configurable.
nginx (with php-fpm)
nginx is lightning fast and much more lightweight than Apache and IIS.
||We use PHP version 5.5 for Kayako Classic OnDemand.
||We find xcache to be lightweight and does the job very well.
What our customers use
Our customers use a huge variety of platforms and configurations, including both Linux and Windows. This is what we have identified to be the most common web server setup:
||What we use
||Linux (CentOS, Red Hat Linux, Debian, Ubuntu)
||Linux is free, well supported, fast and secure. That's why it is the most popular Operating System amongst our customers and the world.
Apache (for Linux and Windows)
||Apache is the world's most popular web server, and very easy to configure. It is prepackaged into most Linux distributions, making it the quickest web server to get started with.
||We recommend 5.5 as it is the latest tested version.
||Most likely based on our recommendation, and also because it is fairly simple to install.