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KINIT(1) General Commands Manual KINIT(1)


kinitacquire initial tickets


kinit [--afslog] [-c cachename | --cache=cachename] [-f | --forwardable] [-F | --no-forwardable] [-t keytabname | --keytab=keytabname] [-l time | --lifetime=time] [-p | --proxiable] [-R | --renew] [--renewable] [-r time | --renewable-life=time] [-S principal | --server=principal] [-s time | --start-time=time] [-k | --use-keytab] [-v | --validate] [-e enctypes | --enctypes=enctypes] [-a addresses | --extra-addresses=addresses] [--password-file=filename] [--fcache-version=version-number] [-A | --no-addresses] [-n | --anonymous] [--enterprise] [--version] [--help] [principal [command]]


kinit is used to authenticate to the Kerberos server as principal, or if none is given, a system generated default (typically your login name at the default realm), and acquire a ticket granting ticket that can later be used to obtain tickets for other services.

Supported options:

cachename --cache=cachename
The credentials cache to put the acquired ticket in, if other than default.
Obtain a ticket than can be forwarded to another host.
Do not obtain a forwardable ticket.
keytabname, --keytab=keytabname
Don't ask for a password, but instead get the key from the specified keytab.
time, --lifetime=time
Specifies the lifetime of the ticket. The argument can either be in seconds, or a more human readable string like ‘1h’.
, --proxiable
Request tickets with the proxiable flag set.
, --renew
Try to renew ticket. The ticket must have the ‘renewable’ flag set, and must not be expired.
The same as --renewable-life, with an infinite time.
time, --renewable-life=time
The max renewable ticket life.
principal, --server=principal
Get a ticket for a service other than krbtgt/LOCAL.REALM.
time, --start-time=time
Obtain a ticket that starts to be valid time (which can really be a generic time specification, like ‘1h’) seconds into the future.
, --use-keytab
The same as --keytab, but with the default keytab name (normally FILE:/etc/krb5.keytab).
, --validate
Try to validate an invalid ticket.
, --enctypes=enctypes
Request tickets with this particular enctype.
read the password from the first line of filename. If the filename is STDIN, the password will be read from the standard input.
Create a credentials cache of version version-number.
, --extra-addresses=enctypes
Adds a set of addresses that will, in addition to the systems local addresses, be put in the ticket. This can be useful if all addresses a client can use can't be automatically figured out. One such example is if the client is behind a firewall. Also settable via libdefaults/extra_addresses in krb5.conf(5).
, --no-addresses
Request a ticket with no addresses.
, --anonymous
Request an anonymous ticket. With the default (false) setting of the historical_anon_pkinit configuration parameter, if the principal is specified as @REALM, then anonymous PKINIT will be used to acquire an unauthenticated anonymous ticket and both the client name and (with fully RFC-comformant KDCs) realm in the returned ticket will be anonymized. Otherwise, authentication proceeds as normal and the anonymous ticket will have only the client name anonymized. With historical_anon_pkinit set to true, the principal is interpreted as a realm even without an at-sign prefix, and it is not possible to obtain authenticated anonymized tickets.
Parse principal as a enterprise (KRB5-NT-ENTERPRISE) name. Enterprise names are email like principals that are stored in the name part of the principal, and since there are two @ characters the parser needs to know that the first is not a realm. An example of an enterprise name is “”, and this option is usually used with canonicalize so that the principal returned from the KDC will typically be the real principal name.
Gets AFS tickets, converts them to version 4 format, and stores them in the kernel. Only useful if you have AFS.

The forwardable, proxiable, ticket_life, and renewable_life options can be set to a default value from the appdefaults section in krb5.conf, see krb5_appdefault(3).

If a command is given, kinit will set up new credentials caches, and AFS PAG, and then run the given command. When it finishes the credentials will be removed.


Specifies the default credentials cache.
The file name of krb5.conf, the default being /etc/krb5.conf.


kdestroy(1), klist(1), krb5_appdefault(3), krb5.conf(5)

April 25, 2006 HEIMDAL