Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.
2018-05-05 18:00:51 +02:00
parent 7745f0e0c5
commit 7f3b633aa0
2327 changed files with 10928 additions and 171503 deletions
@@ -0,0 +1,92 @@
+---
+title: Limit Storage Consumption
+content_template: templates/task
+---
+
+{{% capture overview %}}
+
+This example demonstrates an easy way to limit the amount of storage consumed in a namespace.
+
+The following resources are used in the demonstration: [ResourceQuota](/docs/concepts/policy/resource-quotas/),
+[LimitRange](/docs/tasks/administer-cluster/memory-default-namespace/),
+and [PersistentVolumeClaim](/docs/concepts/storage/persistent-volumes/).
+
+{{% /capture %}}
+
+{{% capture prerequisites %}}
+
+* {{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+
+{{% /capture %}}
+
+{{% capture steps %}}
+## Scenario: Limiting Storage Consumption
+
+The cluster-admin is operating a cluster on behalf of a user population and the admin wants to control
+how much storage a single namespace can consume in order to control cost.
+
+The admin would like to limit:
+
+1. The number of persistent volume claims in a namespace
+2. The amount of storage each claim can request
+3. The amount of cumulative storage the namespace can have
+
+
+## LimitRange to limit requests for storage
+
+Adding a `LimitRange` to a namespace enforces storage request sizes to a minimum and maximum. Storage is requested
+via `PersistentVolumeClaim`. The admission controller that enforces limit ranges will reject any PVC that is above or below
+the values set by the admin.
+
+In this example, a PVC requesting 10Gi of storage would be rejected because it exceeds the 2Gi max.
+
+```
+apiVersion: v1
+kind: LimitRange
+metadata:
+  name: storagelimits
+spec:
+  limits:
+  - type: PersistentVolumeClaim
+    max:
+      storage: 2Gi
+    min:
+      storage: 1Gi
+```
+
+Minimum storage requests are used when the underlying storage provider requires certain minimums. For example,
+AWS EBS volumes have a 1Gi minimum requirement.
+
+## StorageQuota to limit PVC count and cumulative storage capacity
+
+Admins can limit the number of PVCs in a namespace as well as the cumulative capacity of those PVCs. New PVCs that exceed
+either maximum value will be rejected.
+
+In this example, a 6th PVC in the namespace would be rejected because it exceeds the maximum count of 5. Alternatively,
+a 5Gi maximum quota when combined with the 2Gi max limit above, cannot have 3 PVCs where each has 2Gi. That would be 6Gi requested
+ for a namespace capped at 5Gi.
+
+```
+apiVersion: v1
+kind: ResourceQuota
+metadata:
+  name: storagequota
+spec:
+  hard:
+    persistentvolumeclaims: "5"
+    requests.storage: "5Gi"
+```
+
+{{% /capture %}}
+
+{{% capture discussion %}}
+
+## Summary
+
+A limit range can put a ceiling on how much storage is requested while a resource quota can effectively cap the storage
+consumed by a namespace through claim counts and cumulative storage capacity. The allows a cluster-admin to plan their
+cluster's storage budget without risk of any one project going over their allotment.
+
+{{% /capture %}}
+
+