Information
https://docs.docker.com/articles/certificates/
2.http://docs.docker.com/reference/commandline/cli/#insecure-registries
Solution
chown root-root /etc/docker/certs.d/<registry-name>/*
This would set the ownership and group-ownership for the registry certificate files to
'root'.Impact-None.Default Value-By default, the ownership and group-ownership for registry certificate files is correctly set
to 'root'.