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Added section about node autoscaler to node design doc.

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Added section about node autoscaler to node design doc.
This commit is contained in:
Jerzy Szczepkowski
2015-08-12 16:23:17 +02:00
parent 755287ca3a
commit 0f8bd6020c
2 changed files with 42 additions and 10 deletions
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docs/admin/node.md
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@@ -192,16 +192,6 @@ For self-registration, the kubelet is started with the following options:
Currently, any kubelet is authorized to create/modify any node resource, but in practice it only creates/modifies
its own. (In the future, we plan to limit authorization to only allow a kubelet to modify its own Node resource.)
If your cluster runs short on resources you can easily add more machines to it if your cluster is running in Node self-registration mode. If you're using GCE or GKE it's done by resizing Instance Group managing your Nodes. It can be accomplished by modifying number of instances on `Compute > Compute Engine > Instance groups > your group > Edit group` [Google Cloud Console page](https://console.developers.google.com) or using gcloud CLI:
```
gcloud compute instance-groups managed --zone compute-zone resize my-cluster-minon-group --new-size 42
```
Instance Group will take care of putting appropriate image on new machines and start them, while Kubelet will register its Node with API server to make it available for scheduling. If you scale the instance group down, system will randomly choose Nodes to kill.
In other environments you may need to configure the machine yourself and tell the Kubelet on which machine API server is running.
#### Manual Node Administration
A cluster administrator can create and modify Node objects.
@@ -258,6 +248,7 @@ Set the `cpu` and `memory` values to the amount of resources you want to reserve
Place the file in the manifest directory (`--config=DIR` flag of kubelet). Do this
on each kubelet where you want to reserve resources.
## API Object
Node is a top-level resource in the kubernetes REST API. More details about the