Order
kinit -kt /export/kerberos/1/a.keytab a/[email protected]
kinit -kt Description
This command is part of the Kerberos authentication protocol and is used to obtain Kerberos tickets. Kerberos is a network authentication protocol used to securely authenticate users on a computer network.
The "-kt" option in the command specifies the keytab file used for authentication. Keytab files contain the keys used to encrypt and decrypt Kerberos tickets.
Therefore, the main purpose of the kinit -kt command is to obtain Kerberos tickets by using the keytab file. These tickets can be used to access network resources that require authentication.
Note that this command requires you to have a Kerberos client installed on your system and requires you to have valid Kerberos credentials to run successfully.
Steps
kinit -kt /export/kerberos/1/a.keytab a/[email protected] command is used to authenticate a user to the Kerberos authentication system in order to access secured resources in a Hadoop cluster. Here’s how it works:
- The kinit command requests a ticket-granting ticket (TGT) from the Kerberos authentication system by contacting the Kerberos Authentication Server (KAS).
- The -kt option specifies the path to the keytab file that contains the secret key and principal information for the user requesting access.
- The a/[email protected] argument specifies the Kerberos principal for the Hadoop HDFS service, which will authenticate the user.
- The KAS verifies the credentials of the user against the Kerberos database and generates a TGT which is encrypted with the user’s secret key.
- The TGT is returned to the user, and the user can then use it to authenticate to the Hadoop cluster resources and services.
- The TGT is a time-limited token which gives the user access to secured resources within the Hadoop cluster until it expires.
Kerberos common commands
The following are commonly used commands in the Kerberos authentication protocol:
kinit: Used to obtain Kerberos tickets. For example: kinit username@REALM.
klist: Used to list Kerberos tickets for the current user. For example: klist.
kdestroy: Used to destroy the Kerberos ticket for the current user. For example: kdestroy.
kadmin: Used to manage the Kerberos database. For example: kadmin -p admin/admin.
kvno: used to display the ticket version number of the specified service. For example: kvno service_principal.
kpasswd: used to change the Kerberos password. For example: kpasswd username.
ktutil: Used to manage Kerberos keytabs. For example: ktutil.
These commands can be run in a Unix/Linux terminal or a Windows command prompt. Note that these commands require that you have a Kerberos client installed on your system and that you have valid Kerberos credentials to run successfully.