kinit man page on CentOS

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KINIT(1)							      KINIT(1)

NAME
       kinit - obtain and cache Kerberos ticket-granting ticket

SYNOPSIS
       kinit  [-5] [-4] [-V] [-l lifetime] [-s start_time] [-r renewable_life]
	      [-p | -P] [-f | -F] [-a] [-A] [-v] [-R] [-k [-t keytab_file]]
	      [-c cache_name] [-S service_name] [principal]

DESCRIPTION
       kinit  obtains and caches an initial ticket-granting ticket for princi‐
       pal.  The typical default behavior is to acquire only Kerberos 5	 tick‐
       ets.  However, if kinit was built with both Kerberos 4 support and with
       the default behavior of acquiring both types of tickets, it will try to
       acquire	both  Kerberos 5 and Kerberos 4 by default.  Any documentation
       particular to Kerberos 4 does not apply if Kerberos 4 support  was  not
       built into kinit.

OPTIONS
       -5     get  Kerberos  5	tickets.   This overrides whatever the default
	      built-in behavior may be.	 This option may be used with -4

       -4     get Kerberos 4 tickets.  This  overrides	whatever  the  default
	      built-in	behavior  may  be.   This  option is only available if
	      kinit was built with Kerberos 4 compatibility.  This option  may
	      be used with -5

       -V     display verbose output.

       -l lifetime
	      requests	a  ticket  with	 the lifetime lifetime.	 The value for
	      lifetime must be followed immediately by one  of	the  following
	      delimiters:

		 s  seconds
		 m  minutes
		 h  hours
		 d  days

	      as  in "kinit -l 90m".  You cannot mix units; a value of `3h30m'
	      will result in an error.

	      If the -l option is not specified, the default  ticket  lifetime
	      (configured by each site) is used.  Specifying a ticket lifetime
	      longer than the maximum  ticket  lifetime	 (configured  by  each
	      site) results in a ticket with the maximum lifetime.

       -s start_time
	      requests	a  postdated  ticket,  valid  starting	at start_time.
	      Postdated tickets are issued with the invalid flag set, and need
	      to  be  fed back to the kdc before use.  (Not applicable to Ker‐
	      beros 4.)

       -r renewable_life
	      requests renewable tickets, with	a  total  lifetime  of	renew‐
	      able_life.  The duration is in the same format as the -l option,
	      with the same delimiters.	 (Not applicable to Kerberos 4.)

       -f     request forwardable tickets.  (Not applicable to Kerberos 4.)

       -F     do not request forwardable tickets.  (Not applicable to Kerberos
	      4.)

       -p     request proxiable tickets.  (Not applicable to Kerberos 4.)

       -P     do  not  request proxiable tickets.  (Not applicable to Kerberos
	      4.)

       -a     request tickets with the local address[es].  (Not applicable  to
	      Kerberos 4.)

       -A     request address-less tickets.  (Not applicable to Kerberos 4.)

       -v     requests	that the ticket granting ticket in the cache (with the
	      invalid flag set) be passed to the kdc for validation.   If  the
	      ticket is within its requested time range, the cache is replaced
	      with the validated ticket.  (Not applicable to Kerberos 4.)

       -R     requests renewal of the ticket-granting ticket.	Note  that  an
	      expired  ticket  cannot  be renewed, even if the ticket is still
	      within its renewable life.  When using this option with Kerberos
	      4,  the kdc must support Kerberos 5 to Kerberos 4 ticket conver‐
	      sion.

       -k [-t keytab_file]
	      requests a host ticket, obtained from a key in the local	host's
	      keytab  file.   The  name and location of the keytab file may be
	      specified with the -t keytab_file option; otherwise the  default
	      name  and	 location  will	 be used.  When using this option with
	      Kerberos 4, the kdc must support Kerberos 5 to Kerberos 4 ticket
	      conversion.

       -c cache_name
	      use cache_name as the Kerberos 5 credentials (ticket) cache name
	      and location; if this option is not used, the default cache name
	      and location are used.

	      The  default credentials cache may vary between systems.	If the
	      KRB5CCNAME environment variable is set, its  value  is  used  to
	      name  the	 default  ticket  cache.  Any existing contents of the
	      cache are destroyed by kinit.  (Note: The default name for  Ker‐
	      beros  4	comes  from  the KRBTKFILE environment variable.  This
	      option does not apply to Kerberos 4.)

       -S service_name
	      specify an alternate service name to use	when  getting  initial
	      tickets.	 (Applicable to Kerberos 5 or if using both Kerberos 5
	      and Kerberos 4 with a kdc that supports Kerberos 5 to Kerberos 4
	      ticket conversion.)

ENVIRONMENT
       Kinit uses the following environment variables:

       KRB5CCNAME      Location of the Kerberos 5 credentials (ticket) cache.

       KRBTKFILE      Filename of the Kerberos 4 credentials (ticket) cache.

FILES
       /tmp/krb5cc_[uid]  default  location  of	 Kerberos  5 credentials cache
			  ([uid] is the decimal UID of the user).

       /tmp/tkt[uid]  default location of Kerberos 4 credentials cache	([uid]
		      is the decimal UID of the user).

       /etc/krb5.keytab
		      default location for the local host's keytab file.

SEE ALSO
       klist(1), kdestroy(1), kerberos(1)

								      KINIT(1)
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