14.6.7.4. Using the wrong certificate authority
The following error means that the certificate authority used to sign the certificate of the secured container image registry is different from the authority used by the client:
error: error communicating with registry: Get https://172.30.30.30:5000/: x509: certificate signed by unknown authority
Make sure to provide the right one with the flag --certificate-authority.
As a workaround, the --force-insecure flag can be added instead. However, this is not recommended.