How to Configure Password-less login before OpenShift installation

Issue

• While installation error message: Failed to connect to the host using ssh

2017-12-12 08:50:27,379 p=28864 u=root |  fatal: [10.255.92.34]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: Permission denied
 (publickey,gssapi-keyex,gssapi-with-mic,password).\r\n", "unreachable": true}

• Need help preparing hosts with SSH prior to running Ansible playbook