pingcap
`tiup cluster check`: support port connectivity check
Feature Request
Is your feature request related to a problem? Please describe:
The ports required by tidb cluster is prohibited default by firewall in the case of cross-region deployment. After tiup cluster deployment, tiup cluster display result is normal when all nodes status are up, but connection between cluster nodes may fail.
Describe the feature you'd like:
I'd like that tiup cluster check can not only check port occupancy, but also perform port connectivity check.
Why the featue is needed: In order to achieve cross-cloud high availability, users may deploy cluster in the public network environment.
Describe alternatives you've considered: Login to each node and use Telnet command to check port connectivity.
Teachability, Documentation, Adoption, Migration Strategy:
