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About the User Reference

The User reference is a centralized location for end users (usually DevOps users) to get detailed information about Scalr features geared towards provisioning and managing infrastructure.

IT administrators should review the Administrator Reference.

Reference Sections

Learn more about using Scalr with the following content:

First Steps as a Scalr User

Did you just get access to a Scalr instance? This is where you should start!

Roles and Images

Roles and Images are two fundamental features of Scalr that allow you to build reusable infrastructure components.


Farms are logical groupings of configured Roles (Farm Roles) that are built within the Environment scope. They represent infrastructure topologies, and may be launched to provision actual cloud instances.

Farm Roles

A Farm Role is the instance of a Role that is created when the Role is added to a Farm.

Servers (Instances)

A Server is an instance of a Farm Role. Servers are backed by virtual machines provisioned in your cloud.

Scalarizr Agent

Scalarizr is Scalr's management agent. It is optionally installed on every Scalr-managed Server (Instance), and used for Orchestration and monitoring.  See Discovery Manager - Servers for an overview of the benefits the agent provides.

SSH Keys

Upon launching Servers (Instances), Scalr automatically generates a new SSH Keypair and makes it available to you.

Security Groups

A Security Group is a virtual firewall. Using Security Groups, you can open or close network ports or port ranges for your instances. 

Block Storage

Scalr can be used to automatically provision extra block storage for use with your instances.


Scalr provisions and decommissions Servers (Instances) on your behalf.


Throughout the lifecycle of your Servers (Instances), Scalr automatically fires Events (e.g. "This Server is ready" or "This Server is being terminated"). It is also possible to create your own Events and fire them manually.

Orchestration Engine

The Scalr Orchestration Engine is a powerful tool for Event-based, manual, or recurring (with Script Scheduling) infrastructure automation.

Global Variables

Global Variables are a key value store offered by Scalr and are stored encrypted in the main Scalr database.

Integrating Your Applications with Scalr


Scalr provides essential monitoring for your infrastructure and insight into what Scalr is doing.

Domain Name Management

Scalr can automatically configure DNS records on your behalf, and keep those updated as Servers (Instances) are added and removed.

Chef Integration

Scalr provides built-in integration with Chef, so you can configure Roles, Runlists and Attributes on a Role or Farm Role basis, and have those execute automatically on all your Servers (Instances).

Ansible Tower Integration

Cloud-Specific Scalr Features

Different cloud providers provide different features; Scalr accommodates for these differences by providing a slightly different feature set across clouds.


Webhooks is a Scalr feature that lets you notify external services of events that happen within your Scalr-managed infrastructure.


The Settings Panel lets you customize your Scalr user experience.

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Scalr Architectural Overview

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