Saturday, July 27, 2019

A warm welcome for Kubernetes Service brokers.

Kubernetes service brokers allow the provisioning of services outside the cluster. This enables services to run anywhere and work independently from the cluster. They can even be deployed in the public and private cloud where they can scale across Kubernetes clusters. This is a helpful addition to any Kubernetes cluster.

The service broker architecture also enforces consistency across provisioning of resources. This is done with the help of a standard set of APIs for all resources and their corresponding services that implement the service broker.  Resources are the way in which Kubernetes recognizes each and every entity in the cluster. The framework of Kubernetes then takes this inventory of resources and reconciles the state of the cluster to match the definition of the resources. Anything hosted on the Kubernetes clusters can be described with the help of a custom resource.

Service brokers facilitate the resources provisioned by external services to be understood by Kubernetes as custom resources within the cluster.  This bridging of external resource provisioning with in cluster representation of resources has provided significant benefits to users for the use of these resources.

Almost all provisioning of resources translates into well-known operations of create, update, delete, get and list on the resources. Therefore the resource operations are aligned with the usage of resources along most workflows. This makes it handy for use of Kubernetes clusters for many applications and services.

The trend in cloud computing has shifted from service oriented architecture towards microservices. This has helped the independent provisioning of resources, deployment and scaling of services and overhaul or reworking of services. Service broker makes no claim about how the services need to evolve - whether to form a structural composite pattern or a behavior maintaining pattern. This minimal enforcement has worked mutually beneficial for both the services as well as the Kubernetes cluster.



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