[keycloak-user] Creating initial admin usr to login to master realm

Hi, Can anybody quickly let me know how to create Keycloak initial admin user/pwd if Keycloak is installed on a remote machine (linux) and can't access locally using localhost:<port>? What is the use of Admin CLI (kcadm.sh)? on executing this script I get Java Major minor version problem. *I am using "jdk1.8.0_121". Does kcadm.sh has any issue with JDK 1.8?* Thanks & Regds, *Upananda Singha*