Kubernetes 1.12.3 发布，容器调度管理工具

Kubernetes 是一个开源的、用于管理云平台中多个主机上的容器化的应用，Kubernetes 的目标是让部署容器化的应用简单并且高效，Kubernetes 提供了应用部署、规划、更新与维护的一种机制。

Kubernetes 1.12.3 更新内容：

• Fixes an issue with stuck connections handling error responses ( #71413 ,  @liggitt )

• remove retry operation on attach/detach azure disk ( #70568 ,  @andyzhangx )

• Fix CSI volume limits not showing up in node's capacity and allocatable ( #70540 ,  @gnufied )

• kubeadm: fix a panic when calling "alpha phase certs renew all --use-api=false" ( #70768 ,  @neolit123 )

• Update Cluster Autoscaler to 1.12.1 ( #70705 ,  @losipiuk )

• Improve Azure instance metadata handling by adding caches. ( #70353 ,  @feiskyer )

• Ensure orphan public IPs on Azure deleted when service recreated with the same name. ( #70463 ,  @feiskyer )

• fix azure disk attachment error on Linux ( #70002 ,  @andyzhangx )

• Fix cloud-controller-manager crash when using OpenStack provider and PersistentVolume initializing controller ( #70459 ,  @mvladev )

• Corrects check for non-Azure managed nodes with the Azure cloud provider ( #70135 ,  @marc-sensenich )

• GCE/GKE load balancer health check default interval changes from 2 seconds to 8 seconds, unhealthyThreshold to 3. ( #70099 ,  @grayluck )

• Health check parameters are configurable to be bigger than default values.

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