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    a. Execute below command from /home/ubuntu on coredns master:
           ssh-keygen -t rsa -f coredns.key  - thisThis creates two files- coredns.key and coredns.key.pub under /home/ubuntu
	b. Copy above two key files on site A and site B and execute below command.
           sudo ssh-copy-id -i coredns.key root@<corednsHost>
    c. verify below command works for root user without any prompts(because the key was added with root user):
           ssh -i /home/ubuntu/coredns.key root@<corednsHost>