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Eric Promislow
2024-07-23 11:52:22 -07:00
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docs/reference-guides/rancher-webhook.md
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Rancher-Webhook is an essential component of Rancher that works in conjunction with Kubernetes to enhance security and enable critical features for Rancher-managed clusters.
It integrates with Kubernetes' extensible admission controllers, as described in the [Kubernetes documentation](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/), which allows Rancher-Webhook to inspect specific requests sent to the Kubernetes API server, and add custom, Rancher-specific validation and mutations to the requests that are specific to Rancher. Rancher-Webhook manages the resources to be validated using the `rancher.cattle.io` `ValidatingWebhookConfiguration` and the `rancher.cattle.io` `MutatingWebhookConfiguration`, and will override any manual edits.
It integrates with Kubernetes' extensible admission controllers, as described in the [Kubernetes documentation](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/), which allows Rancher-Webhook to inspect specific requests sent to the Kubernetes API server, and add custom validations and mutations to the requests that are specific to Rancher. Rancher-Webhook manages the resources to be validated using the `rancher.cattle.io` `ValidatingWebhookConfiguration` and the `rancher.cattle.io` `MutatingWebhookConfiguration` objects, and will override any manual edits.
Rancher deploys Rancher-Webhook as a separate deployment and service in both local and downstream clusters. Rancher manages Rancher-Webhook using Helm. It's important to note that Rancher may override modifications made by users to the Helm release. To safely modify these values see [Customizing Rancher-Webhook Configuration](#customizing-rancher-webhook-configuration).
Each Rancher version is designed to be compatible with a single version of the webhook. The compatible versions are provided below for convenience.