I create a secret and mount it as file in pod(config in deployment). If I change the secret, the mounted file will be changed in few seconds. But how can I check the file is updated actually? I don't want to exec into pod and check it , because I want to check it by k8s api or k8s resource status. Is there any way to do that?
You wouldn't really in general check that Kubernetes is not broken. Unless you think you've found a bug, in which case you would use kubectl exec and probably many other things to try and track it down.