Application Services 3 Extension Documentation

Welcome to the F5 Application Services 3 Extension User Guide. To provide feedback on this documentation, you can file a GitHub Issue, or email us at


Application Services 3 Extension (referred to as AS3 Extension or more often simply AS3) is a flexible, low-overhead mechanism for managing application-specific configurations on a BIG-IP system. AS3 uses a declarative model, meaning you provide a JSON declaration rather than a set of imperative commands. The declaration represents the configuration which AS3 is responsible for creating on a BIG-IP system. AS3 is well-defined according to the rules of JSON Schema, and declarations validate according to JSON Schema. AS3 accepts declaration updates via REST (push), reference (pull), or CLI (flat file editing).

This guide contains information on downloading, installing, and using the Application Services 3 Extension.

You can also see our using AS3 video:

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