Cloud Platform environments are based on the following technology stack:

Component	Software
Infrastructure OS	Ubuntu
Infrastructure	Apache
Scripting language	PHP
Database	Percona infrastructure (MySQL) (Cloud Classic) AWS Aurora MySQL (Cloud Next)
File System	Redhat Gluster (Cloud Classic) AWS EFS (Cloud Next)
Caching proxy and load balancer	Varnish®, Nginx
Memory cache	Memcached
Application performance monitoring	New Relic

Updates to these components can cause brief interruptions in service.

For information about the software resources included with Cloud Platform CD on-demand environments and Pipelines jobs, see Additional stack information.

Supported software and features

Cloud Platform environments support:

The code of the current Drupal version or Drupal 7
Drush 8 for Drupal 7 or Drush 10 for the current Drupal version. Drush 10 binaries are unavailable in Ubuntu 20.04 in Cloud Next environments.
Integrated version management (Git)
SSL Certificates
TLS 1.2
TLS 1.3 for Cloud Next environments running on Ubuntu 20.04
Automated disaster recovery backup
Custom cron jobs
Shell access using SSH
File access using SFTP (secure FTP) and rsync
MySQL administration using the MySQL CLI or other tools
The current and prior major release of the Chrome, Firefox, Microsoft Edge, and Safari web browsers

Cloud Platform Enterprise supports the following Enterprise features:

High-availability failover using several Amazon Web Services data centers (Availability Zones)
Outgoing VPN access (Cisco VPN compatible—fee required)
Shared authentication or single sign-on using LDAP or SAML (contact your Sales Engineer for cost and compatibility information)
Multi-region replication (fee required)

All Acquia contract subscribers receive access to Acquia Search.

Additional stack information

The resources for specific features available in Cloud Platform can differ from the resources described on this page. For stack information for features included with Cloud Platform, see the following resources:

Node.js containers: Resources and limitations for Node.js environments
Cloud Platform Pipelines jobs: Resources for Pipelines jobs
Cloud Platform CD on-demand environments: CD environment resources and limitations

Included software

Your Cloud Platform infrastructure includes the following (non-complete) list of software packages:

APCu
ClamAV
Development tools (vim, emacs, gcc)
Drush 8 and 10 (default version: Drush 8)
FreeType
Git
Ghostscript
jpeg / libjpeg
jpegtran
OpenSSL
pngcrush
ssh2
webp
xpm / libxpm
intl

Cloud Platform includes the following programming languages for your convenience, without support or adding of more libraries:

C
Perl
PHP
Python
Ruby

Cloud Platform also includes the following items:

Common Linux command-line utilities
Standard networking tools (including curl, wget, and traceroute)
Performance analysis tools (including ps, top, and strace)
Common PEAR and PECL libraries
Common PHP modules (including PDO, FreeTDS, OpenSSL, JSON, SOAP, curl, and XML). For detailed information, go to your Drupal website’s PHP information page at /admin/reports/status/php

Unsupported software

Cloud Platform does not support the following software:

Moodle (not compatible with high availability)
piwik (this package may cause performance issues)
Any non-Drupal Content Management System (CMS)
CA Single Sign-on (formerly CA SiteMinder)
Internet Explorer 11
Python2, rssh, Drush 9, and Drush 10 binaries

These binaries are unavailable in Ubuntu 20.04.

The following software cannot be installed on Cloud Platform:

Non-standard database software, such as Oracle or Microsoft SQL infrastructure
Custom daemons or services, such as Jabber or Microsoft Exchange
Custom package installations requiring apt-get

You can still install custom executables using your code repository.

Some Drupal contributed modules are incompatible with Cloud Platform, or may require special configuration or care. For more information, see Modules and applications incompatible with Cloud Platform.

Configuration changes

Cloud Platform uses configuration management systems to ensure stability and consistency. As a result, Cloud Platform does not support custom operating system configuration changes, nor does Acquia make arbitrary customizations to configuration files such as Apache virtual hosts. Among other problems, such changes can cause your installation to fall outside the test suite for releases and upgrades, and any changes may not reliably survive a relaunch.

Supported customizations include:

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