Nicholas is a RHEL engineer at NASA. He wants to configure his RHEL-based system to authentice using Kerberos. What steps should Nicholas perform?

To configure a RHEL-based system to authenticate using Kerberos, you need to perform the following steps:

  1. Install the necessary packages: yum install krb5-workstation krb5-libs

  2. Edit the /etc/krb5.conf file to include the Kerberos realm information. The configuration file should contain the following information:

    • [libdefaults]
      default_realm = EXAMPLE.COM
      dns_lookup_realm = false
      dns_lookup_kdc = false
      ticket_lifetime = 24h
      renew_lifetime = 7d
      forwardable = true

      EXAMPLE.COM = {
      kdc =
      admin_server =

      [domain_realm] = EXAMPLE.COM = EXAMPLE.COM
  3. Verify that the Kerberos configuration is correct by using the kinit command to obtain a Kerberos ticket. For example:
  4. Configure the system to use Kerberos for authentication. Edit the /etc/sssd/sssd.conf file and add the following lines to the [sssd] section:
    • [sssd]
      auth_provider = krb5
      krb5_server =
      krb5_realm = EXAMPLE.COM
  5. Restart the SSSD service: systemctl restart sssd

  6. Test Kerberos authentication by logging in to the system with a user account that is managed by Kerberos.

Note that these steps are a simplified overview and may vary depending on your specific environment and requirements. It's recommended to consult the official RHEL documentation and best practices for more detailed instructions.

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