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+# Admission control plugin: LimitRanger
+
+## Background
+
+This document proposes a system for enforcing min/max limits per resource as part of admission control.
+
+## Model Changes
+
+A new resource, **LimitRange**, is introduced to enumerate min/max limits for a resource type scoped to a
+Kubernetes namespace.
+
+```
+const (
+  // Limit that applies to all pods in a namespace
+  LimitTypePod string = "Pod"
+  // Limit that applies to all containers in a namespace
+  LimitTypeContainer string = "Container"
+)
+
+// LimitRangeItem defines a min/max usage limit for any resource that matches on kind
+type LimitRangeItem struct {
+  // Type of resource that this limit applies to
+  Type string `json:"type,omitempty"`
+  // Max usage constraints on this kind by resource name
+  Max ResourceList `json:"max,omitempty"`
+  // Min usage constraints on this kind by resource name
+  Min ResourceList `json:"min,omitempty"`
+}
+
+// LimitRangeSpec defines a min/max usage limit for resources that match on kind
+type LimitRangeSpec struct {
+  // Limits is the list of LimitRangeItem objects that are enforced
+  Limits []LimitRangeItem `json:"limits"`
+}
+
+// LimitRange sets resource usage limits for each kind of resource in a Namespace
+type LimitRange struct {
+  TypeMeta   `json:",inline"`
+  ObjectMeta `json:"metadata,omitempty"`
+
+  // Spec defines the limits enforced
+  Spec LimitRangeSpec `json:"spec,omitempty"`
+}
+
+// LimitRangeList is a list of LimitRange items.
+type LimitRangeList struct {
+  TypeMeta `json:",inline"`
+  ListMeta `json:"metadata,omitempty"`
+
+  // Items is a list of LimitRange objects
+  Items []LimitRange `json:"items"`
+}
+```
+
+## AdmissionControl plugin: LimitRanger
+
+The **LimitRanger** plug-in introspects all incoming admission requests. 
+
+It makes decisions by evaluating the incoming object against all defined **LimitRange** objects in the request context namespace.
+
+The following min/max limits are imposed:
+
+**Type: Container**
+
+| ResourceName | Description |
+| ------------ | ----------- |
+| cpu | Min/Max amount of cpu per container |
+| memory | Min/Max amount of memory per container |
+
+**Type: Pod**
+
+| ResourceName | Description |
+| ------------ | ----------- |
+| cpu | Min/Max amount of cpu per pod |
+| memory | Min/Max amount of memory per pod |
+
+If the incoming object would cause a violation of the enumerated constraints, the request is denied with a set of
+messages explaining what constraints were the source of the denial.
+
+If a constraint is not enumerated by a **LimitRange** it is not tracked.
+
+## kube-apiserver
+
+The server is updated to be aware of **LimitRange** objects.
+
+The constraints are only enforced if the kube-apiserver is started as follows:
+
+```
+$ kube-apiserver -admission_control=LimitRanger
+```
+
+## kubectl
+
+kubectl is modified to support the **LimitRange** resource.
+
+```kubectl describe``` provides a human-readable output of limits.
+
+For example,
+
+```
+$ kubectl namespace myspace
+$ kubectl create -f examples/limitrange/limit-range.json
+$ kubectl get limits
+NAME
+limits
+$ kubectl describe limits limits
+Name:   limits
+Type    Resource  Min Max
+----    --------  --- ---
+Pod   memory    1Mi 1Gi
+Pod   cpu   250m  2
+Container cpu   250m  2
+Container memory    1Mi 1Gi
+```
+
+## Future Enhancements: Define limits for a particular pod or container.
+
+In the current proposal, the **LimitRangeItem** matches purely on **LimitRangeItem.Type**
+
+It is expected we will want to define limits for particular pods or containers by name/uid and label/field selector.
+
+To make a **LimitRangeItem** more restrictive, we will intend to add these additional restrictions at a future point in time.