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Provide example of direct control for Controller concept

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Tim Bannister 2020-10-12 18:36:23 +01:00
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@ -96,6 +96,16 @@ the current state closer in line.
nodes in your cluster. See
[Cluster autoscaling](/docs/tasks/administer-cluster/cluster-management/#cluster-autoscaling)).
The important point here is that the controller makes some change to bring about
your desired state, and then reports current state back to your cluster's API server.
Other control loops can observe that reported data and take their own actions.
In the thermostat example, if the room is very cold then a different controller
might also turn on a frost protection heater. With Kubernetes clusters, the control
plane indirectly works with IP address management tools, storage services,
cloud provider APIS, and other services by
[extending Kubernetes](/docs/concepts/extend-kubernetes/) to implement that.
## Desired versus current state {#desired-vs-current}
Kubernetes takes a cloud-native view of systems, and is able to handle