@Tom Burke
Setup the Server:
Install Kerberos KDC and Admin Server
$ apt update && apt upgrade -y
$ apt install krb5-kdc krb5-admin-server krb5-config -y
$ krb5_newrealm
Locate and edit the krb5.conf
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
default_realm = TEST.COM
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
[realms]
TEST.COM = {
kdc = server.test.com
admin_server = server.test.com
}
[domain_realm]
.test.com = TEST.COM
test.com = TEST.COM
KDC configuration
Locate and edit the kdc.conf /etc/krb5kdc/kdc.conf.
[kdcdefaults]
kdc_ports = 88
kdc_tcp_ports = 88
[realms]
TEST.COM = {
#master_key_type = aes256-cts
acl_file = /var/kerberos/krb5kdc/kadm5.acl
dict_file = /usr/share/dict/words
admin_keytab = /var/kerberos/krb5kdc/kadm5.keytab
supported_enctypes = aes256-cts:normal aes128-cts:normal des3-hmac-sha1:normal arcfour-hmac:normal des-hmac-sha1:normal des-cbc-md5:normal des-cbc-crc:normal
}
Create the Kerberos database
This should pick your REALM for the krb5.conf and kdc.conf you will be prompted for a master password keep it preciously it will be useful for the Ambari Kerberos wizard
# /usr/sbin/kdb5_util create -s
output
Loading random data
Initializing database '/var/kerberos/krb5kdc/principal' for realm 'TEST.COM',
master key name 'K/M@TEST.COM'
You will be prompted for the database Master Password.
It is important that you NOT FORGET this password.
Enter KDC database master key:
Re-enter KDC database master key to verify:
Locate and edit the kadm5.acl
Assign Administrator Privilege by editing the kadm5.acl in /var/kerberos/krb5kdc/kadm5.acl replace the EXAMPLE.COM with your realm
*/admin@TEST.COM *
Restart the KDC and kadmin
Set the 2 daemons to auto start at boot else your cluster won't start
# /etc/rc.d/init.d/krb5kdc start
Starting Kerberos 5 KDC: [ OK ]
# /etc/rc.d/init.d/kadmin start
Starting Kerberos 5 Admin Server:
Create a Kerberos Admin
Use the same master password
# kadmin.local -q "addprinc admin/admin"
Output
Authenticating as principal root/admin@TEST.COM with password.
WARNING: no policy specified for admin/admin@TEST.COM; defaulting to no policy
Enter password for principal "admin/admin@TEST.COM":
Re-enter password for principal "admin/admin@TEST.COM":
Principal "admin/admin@TEST.COM" created.
Check if the root principal was created
Go to Ambari and enable Kerberos
See attached Kerberos setup for HDP 3.1 they are quite similar save for the new UI
