Information
Verify that the Docker server certificate file (the file that is passed alongwith '--tlscert'parameter) is owned and group-owned by 'root'.
Rationale:
The Docker server certificate file should be protected from any tampering. It is used to authenticate Docker server based on the given server certificate. Hence, itmust be owned and group-owned by 'root' to maintain the integrity of the certificate.
Solution
chown root:root <path to Docker server certificate file>
This would set the ownership and group-ownership for the Docker server certificate file to 'root'.
Impact:
None.
Default Value:
By default, the ownership and group-ownership for Docker server certificate file is correctly set to 'root'.