Cluster Configuration

After you provision a Kubernetes cluster using Rancher, you can still edit options and settings for the cluster. To edit your cluster, open the Global view, make sure the Clusters tab is selected, and then select ⋮ > Edit for the cluster that you want to edit.

^{To Edit an Existing Cluster} Edit Cluster

The options and settings available for an existing cluster change based on the method that you used to provision it. For example, only clusters provisioned by RKE have Cluster Options available for editing.

The following table summarizes the options and settings available for each cluster type:

Rancher Capability	RKE Launched	Hosted Kubernetes Cluster	Imported Cluster
Manage member roles	✓	✓	✓
Edit cluster options	✓
Manage node pools	✓

Editing Cluster Membership

Cluster administrators can edit the membership for a cluster, controlling which Rancher users can access the cluster and what features they can use.

Cluster Options

When editing clusters, clusters that are launched using RKE feature more options than clusters that are imported or hosted by a Kubernetes provider. The headings that follow document options available only for RKE clusters.

Updating ingress-nginx

Clusters that were created before Kubernetes 1.16 will have an ingress-nginx updateStrategy of OnDelete. Clusters that were created with Kubernetes 1.16 or newer will have RollingUpdate.

If the updateStrategy of ingress-nginx is OnDelete, you will need to delete these pods to get the correct version for your deployment.

Editing Other Cluster Options

In clusters launched by RKE, you can edit any of the remaining options that follow.

Note: These options are not available for imported clusters or hosted Kubernetes clusters.

^{Options for RKE Clusters} Cluster Options

Option	Description
Kubernetes Version	The version of Kubernetes installed on each cluster node. For more detail, see Upgrading Kubernetes.
Network Provider	The container networking interface that powers networking for your cluster. Note: You can only choose this option while provisioning your cluster. It cannot be edited later.
Project Network Isolation	As of Rancher v2.0.7, if you’re using the Canal network provider, you can choose whether to enable or disable inter-project communication.
Nginx Ingress	If you want to publish your applications in a high-availability configuration, and you’re hosting your nodes with a cloud-provider that doesn’t have a native load-balancing feature, enable this option to use Nginx ingress within the cluster.
Metrics Server Monitoring	Each cloud provider capable of launching a cluster using RKE can collect metrics and monitor for your cluster nodes. Enable this option to view your node metrics from your cloud provider’s portal.
Pod Security Policy Support	Enables pod security policies for the cluster. After enabling this option, choose a policy using the Default Pod Security Policy drop-down.
Docker version on nodes	Configures whether nodes are allowed to run versions of Docker that Rancher doesn’t officially support. If you choose to require a supported Docker version, Rancher will stop pods from running on nodes that don’t have a supported Docker version installed.
Docker Root Directory	The directory on your cluster nodes where you’ve installed Docker. If you install Docker on your nodes to a non-default directory, update this path.
Default Pod Security Policy	If you enable Pod Security Policy Support, use this drop-down to choose the pod security policy that’s applied to the cluster.
Cloud Provider	If you’re using a cloud provider to host cluster nodes launched by RKE, enable this option so that you can use the cloud provider’s native features. If you want to store persistent data for your cloud-hosted cluster, this option is required.

Editing Cluster as YAML

Note: In Rancher v2.0.5 and v2.0.6, the names of services in the Config File (YAML) should contain underscores only: kube_api and kube_controller.

Instead of using the Rancher UI to choose Kubernetes options for the cluster, advanced users can create an RKE config file. Using a config file allows you to set any of the options available in an RKE installation, except for system_images configuration, by specifying them in YAML.

To edit an RKE config file directly from the Rancher UI, click Edit as YAML.
To read from an existing RKE file, click Read from File.

In Rancher v2.0.0-v2.2.x, the config file is identical to the cluster config file for the Rancher Kubernetes Engine, which is the tool Rancher uses to provision clusters. In Rancher v2.3.0, the RKE information is still included in the config file, but it is separated from other options, so that the RKE cluster config options are nested under the rancher_kubernetes_engine_config directive. For more information, see the cluster configuration reference.