Kubernetes 1.7.2 版本发布

Kubernetes 1.7.2 版本发布了，该版本从1.7.1版本以来有15处修改，其中修复一个Pod BUG＃48786， 下载k8s 1.7.2版本，查看 1.7 版本相关介绍。

以下是 1.7.2版本更新内容：

• Use port 20256 for node-problem-detector in standalone mode. (#49316, @ajitak)
• GCE Cloud Provider: New created LoadBalancer type Service will have health checks for nodes by default if all nodes have version >= v1.7.2. (#49330, @MrHohn)
• Azure PD (Managed/Blob) (#46360, @khenidak)
• Fix Pods using Portworx volumes getting stuck in ContainerCreating phase. (#48898, @harsh-px)
• kubeadm: Make kube-proxy tolerate the external cloud provider taint so that an external cloud provider can be easily used on top of kubeadm (#49017, @luxas)
• Fix pods failing to start when subPath is a dangling symlink from kubelet point of view, which can happen if it is running inside a container (#48555, @redbaron)
• Never prevent deletion of resources as part of namespace lifecycle (#48733, @liggitt)
• kubectl: Fix bug that showed terminated/evicted pods even without --show-all. (#48786, @janetkuo)
• Add a runtime warning about the kubeadm default token TTL changes. (#48838, @mattmoyer)
• Local storage teardown fix (#48402, @ianchakeres)
• Fix udp service blackhole problem when number of backends changes from 0 to non-0 (#48524, @freehan)
• hpa: Prevent scaling below MinReplicas if desiredReplicas is zero (#48997, @johanneswuerbach)
• kubeadm: Fix a bug where kubeadm join would wait 5 seconds without doing anything. Now kubeadm join executes the tasks immediately. (#48737, @mattmoyer)
• Fix a regression that broke the --config flag for kubeadm init. (#48915, @mattmoyer)
• Fix service controller crash loop when Service with GCP LoadBalancer uses static IP (#48848, @nicksardo) (#48849, @nicksardo)