Problem with kerberos configuration on some systems

[dragan-vujovic]

Default version of krb5.conf file on some systems has no default realm selected. For example if you spin a digital ocean instance with centos7 and install krb5-server krb5-libs krb5-workstation packages, the file will look something like this:

[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 dns_lookup_realm = false
 ticket_lifetime = 24h
 renew_lifetime = 7d
 forwardable = true
 rdns = false
# default_realm = EXAMPLE.COM
 default_ccache_name = KEYRING:persistent:%{uid}

[realms]
# EXAMPLE.COM = {
#  kdc = kerberos.example.com
#  admin_server = kerberos.example.com
# }

[domain_realm]
# .example.com = EXAMPLE.COM
# example.com = EXAMPLE.COM

Notice the commented out default realm. This causes the setup_kerberos script to fail on the following command:
kdb5_util create -s -P hadoop
kdb5_util: Configuration file does not specify default realm while getting default realm

[dragan-vujovic]

Created a pull request with the fix.