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KB-1811: How to refresh an AD user account's Kerberos ticket automatically

Centrify DirectAudit ,   Centrify DirectControl ,   Centrify Identity Service, Mac Edition ,  

12 April,16 at 11:02 AM

Applies to: Centrify DirectControl 4.2 or later.
 
Question:
How to refresh an Active Directory (AD) user account's Kerberos ticket automatically?
 
Answer:
For AD users who authenticate using DirectControl:
 
1. Modify /etc/centrifydc/centrifydc.conf and set:

krb5.cache.infinite.renewal: true. By default the kerberos tickets are good for 10 hours and the default value of  krb5.cache.renew.interval is 4 hours. 

2. Run: adreload.
 
For service accounts that are set up to read the krb5.keytab file, it can be done by simply creating a crontab entry which renews the account before it expires using kinit:
01 00 * * * /usr/share/centrifydc/kerberos/bin/kinit -k -V hostname$
01 08 * * * /usr/share/centrifydc/kerberos/bin/kinit -k -V hostname$
01 16 * * * /usr/share/centrifydc/kerberos/bin/kinit -k -V hostname$

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