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+# Kubernetes Proposal - Admission Control
+
+**Related PR:** 
+
+| Topic | Link |
+| ----- | ---- |
+| Separate validation from RESTStorage | https://github.com/GoogleCloudPlatform/kubernetes/issues/2977 |
+
+## Background
+
+High level goals:
+
+* Enable an easy-to-use mechanism to provide admission control to cluster
+* Enable a provider to support multiple admission control strategies or author their own
+* Ensure any rejected request can propagate errors back to the caller with why the request failed
+
+Authorization via policy is focused on answering if a user is authorized to perform an action.
+
+Admission Control is focused on if the system will accept an authorized action.
+
+Kubernetes may choose to dismiss an authorized action based on any number of admission control strategies.
+
+This proposal documents the basic design, and describes how any number of admission control plug-ins could be injected.
+
+Implementation of specific admission control strategies are handled in separate documents.
+
+## kube-apiserver
+
+The kube-apiserver takes the following OPTIONAL arguments to enable admission control
+
+| Option | Behavior |
+| ------ | -------- |
+| admission_control | Comma-delimited, ordered list of admission control choices to invoke prior to modifying or deleting an object. |
+| admission_control_config_file | File with admission control configuration parameters to boot-strap plug-in. |
+
+An **AdmissionControl** plug-in is an implementation of the following interface:
+
+```
+package admission
+
+// Attributes is an interface used by a plug-in to make an admission decision on a individual request.
+type Attributes interface {
+  GetClient() client.Interface
+  GetNamespace() string
+  GetKind() string
+  GetOperation() string
+  GetObject() runtime.Object
+}
+
+// Interface is an abstract, pluggable interface for Admission Control decisions.
+type Interface interface {
+  // Admit makes an admission decision based on the request attributes
+  // An error is returned if it denies the request.
+  Admit(a Attributes) (err error)
+}
+```
+
+A **plug-in** must be compiled with the binary, and is registered as an available option by providing a name, and implementation
+of admission.Interface.
+
+```
+func init() {
+  admission.RegisterPlugin("AlwaysDeny", func(config io.Reader) (admission.Interface, error) { return NewAlwaysDeny(), nil })
+}
+```
+
+Invocation of admission control is handled by the **APIServer** and not individual **RESTStorage** implementations.
+
+This design assumes that **Issue 297** is adopted, and as a consequence, the general framework of the APIServer request/response flow
+will ensure the following:
+
+1. Incoming request
+2. Authenticate user
+3. Authorize user
+4. If operation=create|update, then validate(object)
+5. If operation=create|update|delete, then admissionControl.AdmissionControl(requestAttributes)
+  a. invoke each admission.Interface object in sequence
+6. Object is persisted
+
+If at any step, there is an error, the request is canceled.