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Document SizeMemoryBackedVolumes feature for 1.20 #24906

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Merged
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Dec 1, 2020
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Document SizeMemoryBackedVolumes feature for 1.20 #24906

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6 changes: 6 additions & 0 deletions content/en/docs/concepts/storage/volumes.md
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Expand Up @@ -303,6 +303,12 @@ While tmpfs is very fast, be aware that unlike disks, tmpfs is cleared on
node reboot and any files you write count against your container's
memory limit.

{{< note >}}
If the `SizeMemoryBackedVolumes` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) is enabled,
you can specify a size for memory backed volumes. If no size is specified, memory
backed volumes are sized to 50% of the memory on a Linux host.
{{< /note>}}

#### emptyDir configuration example

```yaml
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2 changes: 2 additions & 0 deletions content/en/docs/reference/command-line-tools-reference/feature-gates.md
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Expand Up @@ -148,6 +148,7 @@ different Kubernetes components.
| `ServiceNodeExclusion` | `false` | Alpha | 1.8 | 1.18 |
| `ServiceNodeExclusion` | `true` | Beta | 1.19 | |
| `ServiceTopology` | `false` | Alpha | 1.17 | |
| `SizeMemoryBackedVolumes` | `false` | Alpha | 1.20 | |
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@annajung annajung Nov 23, 2020

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Just need a short description below describing this feature. Then, I think docs are good to merge

| `SetHostnameAsFQDN` | `false` | Alpha | 1.19 | 1.19 |
| `SetHostnameAsFQDN` | `true` | Beta | 1.20 | |
| `StorageVersionHash` | `false` | Alpha | 1.14 | 1.14 |
Expand Down Expand Up @@ -527,6 +528,7 @@ Each feature gate is designed for enabling/disabling a specific feature:
- `ServiceNodeExclusion`: Enable the exclusion of nodes from load balancers created by a cloud provider.
A node is eligible for exclusion if labelled with "`alpha.service-controller.kubernetes.io/exclude-balancer`" key or `node.kubernetes.io/exclude-from-external-load-balancers`.
- `ServiceTopology`: Enable service to route traffic based upon the Node topology of the cluster. See [ServiceTopology](/docs/concepts/services-networking/service-topology/) for more details.
- `SizeMemoryBackedVolumes`: Enables kubelet support to size memory backed volumes. See [volumes](docs/concepts/storage/volumes) for more details.
- `SetHostnameAsFQDN`: Enable the ability of setting Fully Qualified Domain Name(FQDN) as hostname of pod. See [Pod's `setHostnameAsFQDN` field](/docs/concepts/services-networking/dns-pod-service/#pod-sethostnameasfqdn-field).
- `StartupProbe`: Enable the [startup](/docs/concepts/workloads/pods/pod-lifecycle/#when-should-you-use-a-startup-probe) probe in the kubelet.
- `StorageObjectInUseProtection`: Postpone the deletion of PersistentVolume or
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