kubernetes - 什么是 configmap 缓存？

Question

有谁知道什么是 configmap 缓存？

尝试在此处调试 failed to sync configmap cache 错误。

Answer 1

来自文档 here

The kubelet uses its local cache for getting the current value of theConfigMap from Kubernetes API Server. The type of the cache is configurable using theConfigMapAndSecretChangeDetectionStrategy field in theKubeletConfiguration struct. A ConfigMap can be either propagated bywatch (default), ttl-based, or simply redirecting all requestsdirectly to the API server. As a result, the total delay from themoment when the ConfigMap is updated to the moment when new keys areprojected to the Pod can be as long as the kubelet sync period + cachepropagation delay, where the cache propagation delay depends on thechosen cache type (it equals to watch propagation delay, ttl of cache,or zero correspondingly)

无法同步 configmap 缓存 可能是因为 kubelet 无法连接到 Kubernetes API Server 以获取更新的 configMap 数据。我会使用 journalctl -u kubelet

查看 Kubelet 日志