Automate application workloads management on Kubernetes

OpenKruise/Kruise

What is NEW!
Feb 7th, 2020. Kruise v0.4.0 is RELEASED! It provides a new CloneSet controller, please check the CHANGELOG for details.
Nov 24th, 2019. A blog about new UnitedDeployment controller is posted in Kruise Blog (link).

Kruise is the core of the OpenKruise project. It is a set of controllers which extends and complements Kubernetes core controllers on workload management.

Today, Kruise offers four workload controllers:

• 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 is 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.

The project roadmap is actively updated in here. This video demo by Lachlan Evenson is great for new users.

Getting started

Check before installation

Kruise requires APIServer to enable features such as MutatingAdmissionWebhook and ValidatingAdmissionWebhook. You can check your cluster qualification before installing Kruise by running one of the following commands locally. The script assumes a read/write permission to /tmp and the local Kubectl is configured to access the target cluster.

sh -c "$(curl -fsSL https://raw.githubusercontent.com/openkruise/kruise/master/scripts/check_for_installation.sh)"

Install with helm charts [Recommended]

It is recommended that you should install Kruise with helm v3, which is a simple command-line tool and you can get it from here.

helm install kruise https://github.com/openkruise/kruise/releases/download/v0.4.0/kruise-chart.tgz

Note that installing this chart directly means it will use the default template values for kruise-manager. You may have to set your specific configurations when it is deployed into a production cluster or you want to enable specific controllers.

Install with YAML files [Deprecated]

# Install CRDs
kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/config/crds/apps_v1alpha1_broadcastjob.yaml
kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/config/crds/apps_v1alpha1_sidecarset.yaml
kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/config/crds/apps_v1alpha1_statefulset.yaml
kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/config/crds/apps_v1alpha1_uniteddeployment.yaml
kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/config/crds/apps_v1alpha1_cloneset.yaml

# Install kruise-controller-manager
kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/config/manager/all_in_one.yaml

Note that all_in_one.yaml contains the daily packaged image of Kruise-manager, which might be unstable. So you may install with YAML files in test clusters, but it is not suitable for production.

The official kruise-controller-manager image is hosted under docker hub.

Optional: Enable specific controllers

If you only need some of the Kruise controllers and want to disable others, you can use either one of the two options or both:

1. Only install the CRDs you need.

2. Set env CUSTOM_RESOURCE_ENABLE in kruise-manager container by changing kruise-controller-manager statefulset template. The value is a list of resource names that you want to enable. For example, CUSTOM_RESOURCE_ENABLE=StatefulSet,SidecarSet means only AdvancedStatefulSet and SidecarSet controllers/webhooks are enabled, all other controllers/webhooks are disabled.

Usage

Please see detailed documents which include examples, about Kruise controllers. We also provider tutorials to demonstrate how to use Kruise controllers.

Developer Guide

There’s a Makefile in the root folder which describes the options to build and install. Here are some common ones:

Build the controller manager binary

make manager

Run the tests

make test

Build the docker image, by default the image name is openkruise/kruise-manager:v1alpha1

export IMG=<your_image_name> && make docker-build

Push the image

export IMG=<your_image_name> && make docker-push or just docker push <your_image_name>

Generate manifests e.g. CRD, RBAC YAML files etc.

make manifests

To develop/debug kruise controller manager locally, please check the debug guide.

Uninstall

Note that this will lead to all resources created by Kruise, including webhook configurations, services, namespace, CRDs, CR instances and Pods managed by Kruise controller, to be deleted! Please do this ONLY when you fully understand the consequence.

To uninstall kruise if it is installed with helm charts:

helm uninstall kruise

To uninstall kruise if it is installed with YAML files:

sh -c "$(curl -fsSL https://raw.githubusercontent.com/kruiseio/kruise/master/scripts/uninstall.sh)"

Community

If you have any questions or want to contribute, you are welcome to communicate most things via GitHub issues or pull requests.

Other active communication channels:

• Slack: channel address
• Mailing List: todo
• Dingtalk Group(钉钉讨论群)

Copyright

Certain implementation relies on existing code from Kubernetes and the credit goes to original Kubernetes authors.