Hostname length limit
08-15-2011 11:59 AM
I'm wondering if there is a limit on number of characters that a hostname can have when joining 2008 AD domain?
Basically what I'm seeing is that I cannot join hosts such as this sequentially:
Lets say this host - prod-useast1-xxxxxapache1 - joins fine with adjoin -w blah blah:
Next host barfs with the following error when trying to join:
[root@prod-useast1-xxxxxmobilegw1 ~]# adjoin -w -u xxx xxxxxx.lan Using LDAP to create computer name larger than 15 characters. This requires Windows Administrator privileges. Try -N option if you cannot use an Administrator account. xxx's Active Directory password: Using writable domain controller: xxxxx-ad5.xxxxxx.lan Error: There was another computer with same name ('CN=prod-useast1-xxxxxapache1,CN=Computers,DC=Pay
diant,DC=LAN') previously joined to a zone in this forest. To overwrite the existing computer data, please use the --force option to adjoin. Note that, you may need Domain Administrator privileges in order to overwrite the current configuration. Join to domain 'xxxxxx.lan', zone 'Auto Zone' failed.
Is there a solution to this?
Some additional info:
AD shows the machines in "Computers":
pre-Windows 2000 name: prod-useast1-xx
08-15-2011 01:39 PM
Microsoft has 15-character limit on the host name length, here is the KB: http://support.microsoft.com/kb/909264. Based on our tests, we could extend the hostname limit to 19 characters, beyond which it fails when the machine attempts to do a password bind to AD.
We recommend that you use 15 chars or less. You can do a man page on adjoin and check -N option for more information.
08-15-2011 02:16 PM
Thanks for the tip.
Is there a workaround though? Centirfy mentions something about LDAP storage of the hostnames above 19characters in this document:
I find it hard to believe that your clients listed here http://www.centrify.com/customers/overview.asp
all adhere to the15 character limit for the hostnames. How do they solve this issue?
08-15-2011 02:30 PM
If you do not want to change the hostname on the linux machine, what you can do is run the adjoin with -n flag and provide a name < than 15 chars but use -a flag to provide the hostname ( ie., 15 or more chars )
AD domain: contoso.local
adjoin -n lonudr-flexapp5 -a lonudr-flexapporacledb5 -a lonudr-flexapporacledb5.contoso.local contoso.local
Hope this helps,
08-15-2011 02:34 PM
Thanks man. I guess we'll have to get creative with our naming scheme :)
Too bad Microsoft is not addressing this issue on their end by extending it somehow.