Azure Kubernetes 服务 (AKS) 节点自动修复Azure Kubernetes Service (AKS) node auto-repair
AKS 会持续检查工作器节点的运行状况，在节点运行不正常的情况下对其进行自动修复。AKS continuously checks the health state of worker nodes and performs automatic repair of the nodes if they become unhealthy. 本文档向操作员介绍了自动节点修复功能在 Windows 和 Linux 节点上的行为方式。This document informs operators about how automatic node repair functionality behaves for both Windows and Linux nodes. 除了 AKS 修复，Azure VM 平台还会对遇到问题的虚拟机执行维护。In addition to AKS repairs, the Azure VM platform performs maintenance on Virtual Machines that experience issues as well. AKS 和 Azure VM 协同工作，以最大程度地减少群集的服务中断次数。AKS and Azure VMs work together to minimize service disruptions for clusters.
AKS 如何检查运行不正常的节点How AKS checks for unhealthy nodes
AKS 使用规则来确定节点是否运行不正常以及是否需要修复。AKS uses rules to determine if a node is unhealthy and needs repair. AKS 使用以下规则来确定是否需要自动修复。AKS uses the following rules to determine if automatic repair is needed.
- 节点在 10 分钟的时间范围内持续检查时报告状态为“未就绪”The node reports status of NotReady on consecutive checks within a 10-minute timeframe
- 节点在 10 分钟内未报告状态The node doesn't report a status within 10 minutes
可使用 kubectl 手动检查节点的运行状况状态。You can manually check the health state of your nodes with kubectl.
kubectl get nodes
自动修复的工作原理How automatic repair works
备注
AKS 使用用户帐户“aks-remediator”启动修复操作。AKS initiates repair operations with the user account aks-remediator.
如果某个节点运行不正常（根据上述规则确定），并且连续 10 分钟仍不正常，则会执行以下操作。If a node is unhealthy based on the rules above and remains unhealthy for 10 consecutive minutes, the following actions are taken.
- 重新启动该节点Reboot the node
- 如果重新启动失败，则对该节点重置映像If the reboot is unsuccessful, reimage the node
- 如果重置映像失败，则创建新节点并对新节点重置映像If the reimage is unsuccessful, create and reimage a new node
如果上述操作均失败，AKS 工程师将详细研究其他修正方法。If none of the actions are successful, additional remediations are investigated by AKS engineers. 如果在运行状况检查期间多个节点运行不正常，则在开始另一个修复之前，将单独修复每个节点。If multiple nodes are unhealthy during a health check, each node is repaired individually before another repair begins.