timed out waiting for to be synced

程序操作kubernetes资源时, 没有等旧的资源删除完毕就立即创建了同名的新资源, 导致出现了一些错误.

具体表现为kubernetes命令行删除StatefulSet时报错, timed out waiting for "mysql" to be synced, 删除多次卡住, 然后报这个超时错误.

查看这个StatefulSet:

root@kub3:~# kubectl -n admin-d2069c get statefulset mysql -o yaml
...
spec:podManagementPolicy: OrderedReadyreplicas: 0revisionHistoryLimit: 10selector:matchLabels:app: mysqlappname: mysqlname: mysqlserviceName: mysqltemplate:metadata:creationTimestamp: nulllabels:app: mysqlappname: mysqlname: mysqlname: mysql
...

replicas为0, 但是查看其下有两个状态为terminating的pod:

statefulsets/mysql                      0         2         19hpo/mysql-0                                   0/1       Terminating   0          19h
po/mysql-1                                   0/1       Terminating   0          19h

然后使用如下命令再次进行删除操作:

kubectl -n admin-d2069c delete statefulset mysql --cascade=false

成功.

出现这种情况的原因是, 删除StatefulSet时会级联删除其下pod资源, 然而yaml定义中的replica为0导致了混乱, 使用--cascade=false禁用级联删除则成功, 然后单独删除其下的两个pod.

删除pod时也要注意, 因为正常情况下, StatefulSet负责管理其下的pod而不需要人为干预。所以这里要使用强制删除:

若使用1.5或者更高版本的kubectl强制删除Pod，请执行以下命令：

kubectl delete pods <pod> --grace-period=0 --force

如果您使用1.4或者更低版本的kubectl，需要省略--force选项：

kubectl delete pods <pod> --grace-period=0

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