IsDNSReady checks if dns and ip is ready, it can successfully resolve dns.

WaitForDNSReady checks if dns is ready.

WaitForPodReady checks if pod is ready.

this is a general script template, which can be used for all kinds of exec request to databases.

actions for cluster accounts management.

for component.

ProbeError is the error for Lorry probe api, it implements error interface.