This script attempts to create a Kerberos realm. It assumes that none of the realm components exists, except for the /etc/krb5.conf file. (Normally this file is automatically generated at package installation, but if you skipped the configuration step, you will need to manually generate this file before running krb5_newrealm.) It creates the database, initializes the stash file in /etc/krb5kdc/stash containing the master key for the database, starts the KDC and Kerberos admin server, and creates a stub /etc/krb5kdc/kadm5.acl file.