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README.md

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Overview

Kubernetes provides a set of default controllers for workload management, like StatefulSet, Deployment, DaemonSet for instances. While at the same time, managed applications express more and more diverse requirements for workload upgrade and deployment, which in many cases, cannot be satisfied by the default workload controllers.

Kruise attempts to fill such gap by offering a set of controllers as the supplement to manage new workloads in Kubernetes. The target use cases are representative, originally collected from the users of Alibaba cloud container services and the developers of the in-house large scale on-line/off-line container applications. Most of the use cases can be easily applied to other similar cloud user scenarios.

Currently, Kruise supports the following workloads.

Workloads

  • Advanced StatefulSet: An enhanced version of default StatefulSet with extra functionalities such as inplace-update, pasue and MaxUnavailable.
  • BroadcastJob: A job that runs pods to completion across all the nodes in the cluster.
  • SidecarSet: A controller that injects sidecar containers into the Pod spec based on selectors and also be able to upgrade the sidecar containers.
  • UnitedDeployment: This controller manages application pods spread in multiple fault domains by using multiple workloads.
  • CloneSet: CloneSet is a workload that mainly focuses on managing stateless applications. It provides full features for more efficient, deterministic and controlled deployment, such as inplace update, specified pod deletion, configurable priority/scatter update, preUpdate/postUpdate hooks.

Benefits

  • In addition to serving new workloads, Kruise also offers extensions to default controllers for new capabilities. Kruise owners will be responsible to port any change to the default controller from upstream if it has an enhanced version inside (e.g., Advanced StatefulSet).

  • Kruise provides controllers for representative cloud native applications with full Kubernetes API compatibility. Ideally, it can be the first option to consider when one wants to extend upstream Kubernetes for workload management.

  • Kruise plans to offer more Kubernetes automation solutions in the areas of scaling, QoS and operators, etc. Stay tuned!

Tutorials

Several Tutorials are provided to demonstrate how to use the controllers