Detailed explanations of Service Catalog system concepts and abstractions.

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The service-catalog project is in incubation to bring integration with service brokers to the Kubernetes ecosystem via the Open Service Broker API.

A service broker is an endpoint that manages a set of software offerings called services. The end-goal of the service-catalog project is to provide a way for Kubernetes users to consume services from brokers and easily configure their applications to use those services, without needing detailed knowledge about how those services are created or managed.

As an example:

Most applications need a datastore of some kind. The service-catalog allows Kubernetes applications to consume services like databases that exist somewhere in a simple way:

  1. A user wanting to consume a database in their application browses a list of available services in the catalog
  2. The user asks for a new instance of that service to be provisioned

    Provisioning means that the broker somehow creates a new instance of a service. This could mean basically anything that results in a new instance of the service becoming available. Possibilities include: creating a new set of Kubernetes resources in another namespace in the same Kubernetes cluster as the consumer or a different cluster, or even creating a new tenant in a multi-tenant SaaS system. The point is that the consumer doesn’t have to be aware of or care at all about the details.

  3. The user requests a binding to use the service instance in their application

    Credentials are delivered to users in normal Kubernetes secrets and contain information necessary to connect to and authenticate to the service instance.


The service catalog API has five main concepts:

The remaining four concepts all map directly to new Kubernetes resource types that are provided by the service catalog API.

These concepts and resources are the building blocks of the service catalog.

Service Resources

See Resources for details on each Service Catalog resource (or type).

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