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# Resources and limitations for Node.js environments¶

This documentation page describes the specific resources available for your use in Acquia Cloud Node.js application environments, and the current limitations of the environment types. For a complete list of all the software resources included with Acquia Cloud applications, see Acquia Cloud technology platform and supported software.

## Application sizes¶

Node.js applications have three sizes: Small, Medium, and Large. Each application size has a corresponding production environment and a Small development environment. The environment sizes have the following limits:

Feature Development - Small Production - Small Production - Medium Production - Large
Max number of processes 4 4 8 12
Max RAM per process (GB) 1.875 (7.5 total) 1.875 (7.5 total) 1.875 (15 total) 1.875 (22.5 total)

## Resources¶

Each environment in a Node.js application includes the following components:

Component Version
Web server OS Ubuntu 16.04
Node.js 6.15.1 (default), 8.14.0, 10.14.2
npm 2.15.11

Note

To request a version of Node.js for your environment other than the default, contact Acquia support.

Also included are the following items:

• Acquia Cloud pipelines feature
• A Git repository

## Limitations¶

Node.js environments in Acquia Cloud have the following limitations:

• Elastic IP Addresses (EIPs) are not supported on production and non-production environments.
• Non-production environments are shared resources, and are subject to unexpected relaunches.
• The following features are not supported:
• Acquia Cloud Shield
• SSH access into servers
• Varnish® or custom VCLs
• Memcached
• CD environments
• There is no supported database service or file system asset manager, but you can connect to an external file system/database service, such as a Drupal website.
• Node.js applications can expose only one port, indicated by process.env.PORT, which is set by Acquia and cannot be overridden. You can, however, use websockets to handle multiple concurrent connections.