Supply Chain Choreographer for VMware Tanzu

Overview

Supply Chain Choreographer (SCC) enables app operators to create pre-approved paths to production by integrating Kubernetes resources with the elements of their existing toolchains, such as Tekton, Jenkins, and others.

Each pre-approved supply chain creates a paved road to production. This orchestration of supply chain components -- test, build, scan, and deploy -- enables developers to focus on delivering value to their users while also providing operators with the peace of mind that all code in production has passed through all the steps of an approved workflow.

Design and Philosophy

The following sections describe the design and philosophy of SCC.

Structure

SCC enables users to define all of the steps that an application must go through to run in a given environment.

You can view SCC as three separate functional pieces:

  • On-cluster resources
  • Interfaces
  • YAML definitions

Supply Chain and Delivery

For on-cluster resources, users can codify their paths to production using two abstractions:

The Supply Chain enables users to define the steps that an application must pass through to create container images and embed them into Kubernetes configuration. The Delivery portion of an SCC workflow enables the user to define the steps that promote, test, and validate Kubernetes configuration. By combining Supply Chains and Deliveries, you can use SCC to specify and therefore choreograph the entire path to production.

The Supply Chain and Delivery are not bound to a single cluster. SCC embraces a GitOps approach for image promotion across clusters: a Git repository is used to track the Kubernetes configuration that corresponds to a given application. The delivery portion watches that same Git repository and initiates the second half of the path to production whenever a new configuration is pushed to the repository.

Templates

Both the Supply Chain and Delivery consist of resources that are specified through templates and defined on the cluster through their YAML definitions. Unlike many other Kubernetes-native workflow tools that already exist in the market, SCC does not create Pods or execute commands. Instead, it monitors the status of each resource and updates subsequent resources in the Supply Chain or Delivery when outputs change.

Each template acts as a wrapper for existing Kubernetes resources and enables them to be used with SCC. The templates are where integrations with third-party tooling can be added to the Supply Chain. For example, you can create an integration with ServiceNow that is included in the Supply Chain through a Config template. You can create both open and closed integrations for each of the three different template types.

Workloads

Although the Supply Chain and Delivery are both operator-facing, SCC also provides an abstraction for developers called a Workload. Workloads enable developers to choose application specifications such as the location of their repository, environment variables, and service claims.

By design, Supply Chains can be responsible for many Workloads. This enables an operator to specify the steps in the path to production just once, and developers to specify their applications independently but for each to use the same path to production. This enables developers to focus on providing value for their users and to reach production quickly and easily, while providing peace of mind for app operators, who are assured that each application has passed through the steps of the path to production that they have defined.

SCC high-level diagram. The Supply Chain consists of components. Operators own and apply the Supply Chain. Developers own and apply Workloads that target the Supply Chain. The Supply Chain stamps out running apps.

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