Information
https://docs.docker.com/articles/certificates/
2.http://docs.docker.com/reference/commandline/cli/#insecure-registries
Solution
chmod 444 /etc/docker/certs.d/<registry-name>/*This would set the permissions for registry certificate files to '444'.
Impact-
None.
Default Value-
By default, the permissions for registry certificate files might not be '444'. The default file permissions are governed by the system or user specific umask values.