我将 google cloud kubernetes 集群从 升级1.16.9-gke.2到1.16.9-gke.6但失败了。
所有集群资源都已启动，但是：kube-apiserver端点的组件gke-3a1fa906f95b728d035e-59bc不健康。
我一直遇到这个问题。我的生产服务器完全无法访问。无法回滚。上次更新时我也遇到过这个问题。3-4 次后就解决了。这次我更新了 6-7 次。没运气。
Master of cluster [flow-env-prod] will be upgraded from version
[1.16.9-gke.2] to version [1.16.9-gke.6]. This operation is
long-running and will block other operations on the cluster (including
delete) until it has run to completion.
一些日志：
Upgrading flow-env-prod...done.
ERROR: (gcloud.container.clusters.upgrade) Operation [<Operation
clusterConditions: [<StatusCondition
message: u'All cluster resources were brought up, but: component "kube-apiserver" from endpoint "gke-3a1fa906f95b728d035e-59bc" is unhealthy.'>]
detail: u'All cluster resources were brought up, but: component "kube-apiserver" from endpoint "gke-3a1fa906f95b728d035e-59bc" is unhealthy.'
endTime: u'2020-06-23T02:09:20.859081264Z'
name: u'operation-1592876809477-ed87ffb3'
nodepoolConditions: []
operationType: OperationTypeValueValuesEnum(UPGRADE_MASTER, 3)
selfLink: u'https://container.googleapis.com/v1/projects/[projectID]/zones/europe-west1-b/operations/operation-1592876809477-ed87ffb3'
startTime: u'2020-06-23T01:46:49.477981885Z'
status: StatusValueValuesEnum(DONE, 3)
statusMessage: u'All cluster resources were brought up, but: component "kube-apiserver" from endpoint "gke-3a1fa906f95b728d035e-59bc" is unhealthy.'
targetLink: u'https://container.googleapis.com/v1/projects/[projectID]/zones/europe-west1-b/clusters/flow-env-prod'
zone: u'europe-west1-b'>] finished with error: All cluster resources were brought up, but: component "kube-apiserver" from endpoint "gke-3a1fa906f95b728d035e-59bc" is unhealthy.`