EDIT

#### Requirements

* mysql (v5.x) or MariaDB (v10.0 to v10.3) server

* http server: apache or nginx; in this guide we will only cover the configuration of apache 2 (v 2.4)

* php 7, or php 5.6+ if php 7.x is not yet available for your system. php 8 will not work!

##### php

Install php 7.4 or 7.2 with the following extensions:

~~~

export PHP_VERSION=7.4 ; apt-get install php$PHP_VERSION php$PHP_VERSION-mysql php$PHP_VERSION-gd php$PHP_VERSION-json php$PHP_VERSION-curl php$PHP_VERSION-xml libapache2-mod-php$PHP_VERSION

~~~

For running the CDM Data Portal it is required to assign sufficient memory to php. 

Please open your `/etc/php/7.4/apache2/php.ini` and set the `memory_limit` parameter (memory_limit) to at least `128M`. 

The php.ini responsible for the php processes executed in apache is found in current Debian Linux and derivatives at

`/etc/php/7.4/apache2/php.ini` or `/etc/php/7.2/apache2/php.ini` .

~~~

;;;;;;;;;;;;;;;;;;;

; Resource Limits ;

;;;;;;;;;;;;;;;;;;;

memory_limit = 128M      ; Maximum amount of memory a script may consume (128MB)

~~~

##### Git

Git is needed for downloading (cloning) the  CDM Dataportal Drupal 7 installation package and to keep it up-to-date. 

~~~

sudo apt-get install git

~~~