To change your extra or root kerberos password, 
use the following command:

	passwd username/instance

For example, if you are joeuser and wish to change the password for
your extra instance, you would type:

	passwd joeuser/extra

This works in the same way the passwd command normally works,
i.e.: you will be prompted for your old password, and then a new
one, which you will have to enter twice, to safeguard against any
typos.

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