Feature Flags

With feature flags, you can try out optional or experimental features, and enable legacy features that are being phased out.

To learn more about feature values and how to enable them, see Enabling Experimental Features.

note

Some feature flags require a restart of the Rancher container. Features that require a restart are marked in the Rancher UI.

The following is a list of feature flags available in Rancher. If you've upgraded from a previous Rancher version, you may see additional flags in the Rancher UI, such as proxy or dashboard (both discontinued):

• continuous-delivery: Allows Fleet GitOps to be disabled separately from Fleet. See Continuous Delivery. for more information.
• external-rules: This flag is disabled by default. Only admin users can enable/disable the flag, and note that escalate permissions on RoleTemplates are required to create external RoleTemplates with ExternalRules. Restricted admin users can only enable the flag. If enabled, external RoleTemplates can be created only if the backing ClusterRole exists in the local cluster or the ExternalRules is set. For context, the backing ClusterRole holds cluster rules and privileges, and shares the same metadata.name used in the RoleTemplate in your respective cluster referenced by the ClusterRoleTemplateBinding/ProjectRoleTemplateBinding. Previous external RoleTemplates that don’t have a backing ClusterRole won’t be granted or modifiable unless a backing ClusterRole is created or the ExternalRules field is set. If disabled, external RoleTemplates with .context=project or .context=”” can be created even if the backing ClusterRole does not exist.
• fleet: The Rancher provisioning framework in v2.6 and later requires Fleet. The flag will be automatically enabled when you upgrade, even if you disabled this flag in an earlier version of Rancher. See Continuous Delivery with Fleet for more information.
• harvester: Manages access to the Virtualization Management page, where users can navigate directly to Harvester clusters and access the Harvester UI. See Harvester Integration for more information.
• istio-virtual-service-ui: Enables a visual interface to create, read, update, and delete Istio virtual services and destination rules, which are Istio traffic management features.
• legacy: Enables a set of features from 2.5.x and earlier, that are slowly being phased out in favor of newer implementations. These are a mix of deprecated features as well as features that will eventually be available to newer versions. This flag is disabled by default on new Rancher installations. If you're upgrading from a previous version of Rancher, this flag is enabled.
• multi-cluster-management: Allows multi-cluster provisioning and management of Kubernetes clusters. This flag can only be set at install time. It can't be enabled or disabled later.
• rke1-custom-node-cleanup: Enables cleanup of deleted RKE1 custom nodes. We recommend that you keep this flag enabled, to prevent removed nodes from attempting to rejoin the cluster.
• rke2: Enables provisioning RKE2 clusters. This flag is enabled by default.
• token-hashing: Enables token hashing. Once enabled, existing tokens will be hashed and all new tokens will be hashed automatically with the SHA256 algorithm. Once a token is hashed it can't be undone. This flag can't be disabled after its enabled. See API Tokens for more information.
• unsupported-storage-drivers: Enables types for storage providers and provisioners that aren't enabled by default. See Allow Unsupported Storage Drivers for more information.

The following table shows the availability and default values for some feature flags in Rancher. Features marked "GA" are generally available:

Feature Flag Name	Default Value	Status	Available As Of
continuous-delivery	true	GA	v2.6.0
fleet	true	Can no longer be disabled	v2.6.0
fleet	true	GA	v2.5.0
harvester	true	Experimental	v2.6.1
legacy	false for new installs, true for upgrades	GA	v2.6.0
rke1-custom-node-cleanup	true	GA	v2.6.0
rke2	true	Experimental	v2.6.0
token-hashing	false for new installs, true for upgrades	GA	v2.6.0