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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