modify kdc db max_renewable_life

kerberos_kadmin_hack.txt

-----
for p in `kadmin.local -q listprincs` ; do kadmin.local -q "modprinc -maxrenewlife 1000days $p" ; done
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kadmin.local -q "getprincs" > principals.txt

vi principals.txt
reemove the non-Hadoop principals from the principals.txt file, and then run this small script to update the existing principals: 
for princ in `cat principals.txt`; do kadmin.local -q "modprinc -maxrenewlife 7day $princ"; done;
service krb5kdc restart
service kadmin restart
 
/var/kerberos/krb5kdc/kdc.conf 
[kdcdefaults]
 kdc_ports = 88
 kdc_tcp_ports = 88
 
[realms]
 CLOUDERA = {
  #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
  default_principal_flags = renewable
  max_renewable_life = 7d
 
  # WARNING: aes256-ct:normal is disabled to simplify testing, since it
  # requires the enhanced security JCE policy file to be installed. You should
  # NOT run with this configuration in production or any real environment. You
  # have been warned.
  supported_enctypes = aes128-cts:normal des3-hmac-sha1:normal arcfour-hmac:normal des-hmac-sha1:normal des-cbc-md5:normal des-cbc-crc:normal
 }
 
 
/etc/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 = CLOUDERA
 dns_lookup_realm = false
 dns_lookup_kdc = false
 ticket_lifetime = 24h
 renew_lifetime = 7d
 forwardable = true
 
[realms]
 CLOUDERA = {
  kdc = alice-1.vpc.wonderland.com
  admin_server = alice-1.vpc.wonderland.com
 }
 
[domain_realm]
 .vpc.wonderland.com = CLOUDERA
 alice-1.vpc.wonderland.com = CLOUDERA