Communication Errors

Background

• MySQL can connect from its own pod.
• MySQL can not connect by K8s service.
  • Service endpoint is right.
  • getent inside pod, sometimes failed.
  • Pod network is not ok.
  • Check calicocalico(pod) CNICNI.

Errors

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
...
The driver has not received any packets from the server