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Revision as of 08:27, 9 May 2013 by Stefw (talk | contribs) (Some minor tweaks)
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Join the current machine to an Active Directory domain using sssd as an AD client, using a one time password.


  1. Make sure you have other required software:
    • realmd 0.14.0 or later
    • adcli 0.7 or later
  2. Verify that your Active Directory domain access works, or set a domain up.
  3. You need a domain administrator account.
  4. Your machine must have a configured host name. Do not proceed if you host name is localhost or similar.
    $ hostname
    Make note of the host name.
  5. Remove the following packages, they should be installed by realmd as necessary.
    $ yum remove sssd samba-client
  6. Delete any existing computer account in the domain for this machine:
    $ adcli delete-computer -U AdminUser hostname
    It's fine if this command tells you the computer account doesn't exist
  7. Precreate the computer account in the domain, and set a one time password.
    • You can also use the adcli tool to create a reset computer account:
      $ adcli preset-computer -U AdminUser --verbose --domain --one-time-password=MyPassword hostname
      Make sure the hostname is the same as the one returned above

How to test

  1. Perform the join command.
    $ realm join --one-time-password=MyPassword
    Don't use --user to specify an domain account
    On a successful join there will be no output.
    This can take up to a few minutes depending on how far away your Active Directory domain is.

Expected Results

  1. Check that the domain is now configured.
    $ realm list
    Make sure the domain is listed.
    Make sure you have a configured: kerberos-membership line in the output.
    Make note of the login-formats line for the next command.
  2. Check that you can resolve domain accounts on the local computer.
    $ getent passwd 'AD\User'
    Make sure to use the quotes around the user name.
    You should see an output line that looks like passwd(5) output. It should contain an appropriate home directory, and a shell.
    Use the login-formats you saw above, to build a remote user name. It will be in the form of DOMAIN\User, where DOMAIN is the first part of your full Active Directory domain name.
  3. Check that you have an appropriate entry in your hosts keytab.
    sudo klist -k
    You should see several lines, with your host name. For example 2 HOSTNAME$@AD.EXAMPLE.COM
  4. Check that you can use your keytab with kerberos
    sudo kinit -k 'HOSTNAME$@AD.EXAMPLE.COM'
    Make sure to use quotes around the argument, because of the characters in there. Make sure the hostname and domain are capitalized.
    Use the principal from the output of the klist command above. Use the one that's capitalized and looks like HOSTNAME$@DOMAIN.
    There should be no output from this command.

More: Try one time password again

You should not be able to use the one time password again.

To verify this, leave the domain using realm leave and then try the above How to test actions again. It should fail this time.


Use the --verbose argument to see details of what's being done during a join. Include verbose output in any bug reports.

$ realm join --verbose

If adcli preset-computer fails with '! The computer account <hostname -s> already exists', then you can delete account with

$ adcli delete-computer -U AdminUser <hostname -s>