红帽全球峰会1.7. Red Hat OpenShift Service Mesh 3.1 已知问题
1.7.1. 防止节点升级的 PodDisruptionBudget 对象
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目前存在一个已知问题：防止 OpenShift Container Platform 节点进行升级。podDisruptionBudget 资源可防止排空运行 istiod pod 的节点，除非 istiod pod 有多个副本。
临时解决方案：将 Istio CR 中的 .spec.values.global.defaultPodDisruptionBudget.enabled 字段设置为 false。另外，您可以临时增加 istiod 部署的副本数量。OSSM-9392
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