CloudEvents Controller for Tekton

The CloudEvents controller for Tekton provides CloudEvents for the lifecycle of the following Tekton Resources:

• PipelineRuns
• TaskRuns

CloudEvents is a CNCF project that provides:

"A specification for describing event data in a common way"

The CloudEvents controller supports sending events according to two different specifications:

• Tekton CloudEvents: this spec has been defined by the Tekton project in the absence of a common standard for events in CI/CD, and may be deprecated in future.
• CDEvents: this spec is a CDF incubated project. Its v0.1 version is work in progress, and so is CDEvents support in this controller.

Motivation

CloudEvents support in Tekton today is implement in the specific resource controllers. Having a central controller offloads this work from the controllers and allows to implement new features that can be shared across resources.

Install

Install and configure ko.

ko apply -f config/

This will build and install the controller on your cluster, in the namespace tekton-cloudevents.

Alternatively, install the latest nightly build:

kubectl apply -f https://storage.cloud.google.com/tekton-releases-nightly/cloudevents/latest/release.yaml

Configuration

The controller defines several configuration flags in the config-defaults config map:

Key Name	Description	Default Value
default-cloud-events-sink	The URL of the sink where events are delivered. When empty no events are sent	""
default-cloud-events-format	Which format of CloudEvents to send, legacy or cdevents	cdevents

Logging format and verbosity can be configured in the config-logging config map.

Uninstall

$ kubectl delete namespace tekton-cloudevents
namespace "tekton-cloudevents" deleted

This will stop the controller and delete its namespace.