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Merge pull request #2900 from wlan0/master

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add docs about cloud-controller-manager
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devin-donnelly
2017-03-21 12:00:33 -07:00
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docs/concepts/overview/components.md
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@@ -54,6 +54,22 @@ These controllers include:
* Service Account & Token Controllers: Create default accounts and API access tokens for new namespaces.
* ... and others.
### cloud-controller-manager
`cloud-controller-manager` is a binary that runs controllers that interact with the underlying cloud providers. The `cloud-controller-manager` binary is an alpha feature introduced in Kubernetes release 1.6.
`cloud-controller-manager` runs cloud provider-specific controller loops only. As such, you must disable these controller loops in the `kube-controller-manager`. You can disable the controller loops by setting the `--cloud-provider` flag to `external` when starting the kube-controller-manager.
`cloud-controller-manager` allows cloud vendors and kubernetes core to evolve independent of each other. In prior releases, the core Kubernetes code was dependent upon cloud provider-specific code for functionality. In future releases, code specific to cloud vendors should be maintained by the cloud vendor themselves, and linked to `cloud-controller-manager` while running Kubernetes.
The following controllers have cloud provider dependencies:
* Node Controller: For checking the cloud provider to determine if a node has been deleted in the cloud after it stops responding
* Route Controller: For setting up routes in the underlying cloud infrastructure
* Service Controller: For creating, updating and deleting cloud provider load balancers
* Volume Controller: For creating, attaching, and mounting volumes, and interacting with the cloud provider
to orchestrate volumes
### kube-scheduler
[kube-scheduler](/docs/admin/kube-scheduler) watches newly created pods that have no node assigned, and