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Attach/Detach Controller Kubelet Changes

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This PR contains Kubelet changes to enable attach/detach controller control.
* It introduces a new "enable-controller-attach-detach" kubelet flag to
  enable control by controller. Default enabled.
* It removes all references "SafeToDetach" annoation from controller.
* It adds the new VolumesInUse field to the Node Status API object.
* It modifies the controller to use VolumesInUse instead of SafeToDetach
  annotation to gate detachment.
* There is a bug in node-problem-detector that causes VolumesInUse to
  get reset every 30 seconds. Issue https://github.com/kubernetes/node-problem-detector/issues/9
  opened to fix that.
This commit is contained in:
Saad Ali
2016-05-23 13:37:30 -07:00
committed by saadali
parent 24ddec1cbf
commit 9dbe943491
35 changed files with 2346 additions and 1217 deletions
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docs/admin/kubelet.md
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@@ -82,6 +82,7 @@ kubelet
--cpu-cfs-quota[=true]: Enable CPU CFS quota enforcement for containers that specify CPU limits
--docker-endpoint="": If non-empty, use this for the docker endpoint to communicate with
--docker-exec-handler="native": Handler to use when executing a command in a container. Valid values are 'native' and 'nsenter'. Defaults to 'native'.
--enable-controller-attach-detach[=true]: Enables the Attach/Detach controller to manage attachment/detachment of volumes scheduled to this node, and disables kubelet from executing any attach/detach operations
--enable-custom-metrics[=false]: Support for gathering custom metrics.
--enable-debugging-handlers[=true]: Enables server endpoints for log collection and local running of containers and commands
--enable-server[=true]: Enable the Kubelet's server