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Merge pull request #17924 from xinxiaogang/master

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k8s-merge-robot 2015-12-10 11:14:10 -08:00
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@ -167,7 +167,7 @@ Node controller is a component in Kubernetes master which manages Node
objects. It performs two major functions: cluster-wide node synchronization
and single node life-cycle management.
Node controller has a sync loop that creates/deletes Nodes from Kubernetes
Node controller has a sync loop that deletes Nodes from Kubernetes
based on all matching VM instances listed from the cloud provider. The sync period
can be controlled via flag `--node-sync-period`. If a new VM instance
gets created, Node Controller creates a representation for it. If an existing
@ -178,6 +178,12 @@ join a node to a Kubernetes cluster, you as an admin need to make sure proper se
running in the node. In the future, we plan to automatically provision some node
services.
In general, node controller is responsible for updating the NodeReady condition of node
status to ConditionUnknown when a node becomes unreachable (e.g. due to the node being down),
and then later evicting all the pods from the node (using graceful termination) if the node
continues to be unreachable. (The current timeouts for those are 40s and 5m, respectively.)
It also allocates CIDR blocks to the new nodes.
### Self-Registration of Nodes
When kubelet flag `--register-node` is true (the default), the kubelet will attempt to