Installation

• Since v1.0.0 (alpha/beta), OpenKruise requires Kubernetes version >= 1.16.

• Since v1.6.0 (alpha/beta), OpenKruise requires Kubernetes version >= 1.18. However it’s still possible to use OpenKruise with Kubernetes versions 1.16 and 1.17 as long as KruiseDaemon is not enabled(install/upgrade kruise charts with featureGates=”KruiseDaemon=false”)

• Since v1.6.0 (alpha/beta), KruiseDaemon will no longer support v1alpha2 CRI runtimes. However, it is still possible to use OpenKruise on Kubernetes clusters with nodes that only support v1alpha2 CRI, as long as KruiseDaemon is not enabled (install/upgrade Kruise charts with featureGates=”KruiseDaemon=false”).

Install with helm

Kruise can be simply installed by helm v3.5+, which is a simple command-line tool and you can get it from here.

# Firstly add openkruise charts repository if you haven't do this.
$ helm repo add openkruise https://openkruise.github.io/charts/
# [Optional]
$ helm repo update
# Install the latest version.
$ helm install kruise openkruise/kruise --version 1.6.4

Note: Changelog.

Upgrade with helm

# Firstly add openkruise charts repository if you haven't do this.
$ helm repo add openkruise https://openkruise.github.io/charts/
# [Optional]
$ helm repo update
# Upgrade to the latest version.
$ helm upgrade kruise openkruise/kruise --version 1.6.4 [--force]

Note that:

1. Before upgrade, you must firstly read the Change Log to make sure that you have understand the breaking changes in the new version.
2. If you want to drop the chart parameters you configured for the old release or set some new parameters, it is recommended to add --reset-values flag in helm upgrade command. Otherwise you should use --reuse-values flag to reuse the last release’s values.
3. If you are upgrading Kruise from 0.x to 1.x, you must add --force for upgrade command. Otherwise it is an optional flag.

Optional: download charts manually

If you have problem with connecting to https://openkruise.github.io/charts/ in production, you might need to download the chart from here manually and install or upgrade with it.

$ helm install/upgrade kruise /PATH/TO/CHART

Options

Note that installing this chart directly means it will use the default template values for Kruise.

You may have to set your specific configurations if it is deployed into a production cluster, or you want to configure feature-gates.

Optional: chart parameters

The following table lists the configurable parameters of the chart and their default values.

Specify each parameter using the --set key=value[,key=value] argument to helm install or helm upgrade.

Optional: feature-gate

Feature-gate controls some influential features in Kruise:

If you want to configure the feature-gate, just set the parameter when install or upgrade. Such as:

$ helm install kruise https://... --set featureGates="ResourcesDeletionProtection=true\,PreDownloadImageForInPlaceUpdate=true"

If you want to enable all feature-gates, set the parameter as featureGates=AllAlpha=true.

Optional: the local image for China

If you are in China and have problem to pull image from official DockerHub, you can use the registry hosted on Alibaba Cloud:

$ helm install kruise https://... --set  manager.image.repository=openkruise-registry.cn-shanghai.cr.aliyuncs.com/openkruise/kruise-manager

Best Practices

Installation parameters for K3s

Usually K3s has the different runtime path from the default /var/run. So you have to set daemon.socketLocation to the real runtime socket path on your K3s node (e.g. /run/k3s or /var/run/k3s/).

Installation parameters for AWS EKS

When using a custom CNI (such as Weave or Calico) on EKS, the webhook cannot be reached by default. This happens because the control plane cannot be configured to run on a custom CNI on EKS, so the CNIs differ between control plane and worker nodes.

To address this, the webhook can be run in the host network so it can be reached, by setting --set manager.hostNetwork=true when use helm install or upgrade.

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
release "kruise" uninstalled

Kruise State Metrics

kruise-state-metrics is a simple service that listens to the Kubernetes API server and generates metrics about the state of the objects. It is not focused on the health of the individual OpenKruise components, but rather on the health of the various objects inside, such as clonesets, advanced statefulsets and sidecarsets.

# Firstly add openkruise charts repository if you haven't do this.
$ helm repo add openkruise https://openkruise.github.io/charts/
# [Optional]
$ helm repo update
# Install the latest version.
$ helm install kruise openkruise/kruise-state-metrics --version 0.1.0