Category Archives: Active Directory

Ubuntu 14.04 Active Directory Authentication

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In a post a couple of years ago I gave an example on how to configure an Ubuntu 12.04 server to authenticate to Active Directory. Things used to be hard back then. Now we have the realmd realm enrollment manager to do the hard work of joining the host to an Active Directory domain, and the System Security Services Daemon or SSSD to do the actual authentication and authorization work whenever it is needed. And things are much easier to configure and get running. Continue reading Ubuntu 14.04 Active Directory Authentication

Ubuntu 12.04 Active Directory Authentication

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Update 2015-06-16: Ubuntu 14.04 Active Directory Authentication

Authenticating Linux users against Active Directory has traditionally been hard. There’s a multitude of HOWTOs on how to do it, and every one of them seems to do it a bit differently. This is because environments and goals vary, and there are many ways to achieve a particular goal. I will add my version to the mix. This one fetches users and groups from Active Directory LDAP using a machine account added using the Samba tools, and authenticates users to the Active Directory Key Distribution Center using Kerberos. Continue reading Ubuntu 12.04 Active Directory Authentication

Windows Server Time with NTP

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Here’s how to configure a Windows domain controller to act as an NTP client and server for your network. You may then sync all your hosts, Windows or other, to that server. To achieve this, configure one (or more) of your domain controllers to retrieve time from the atomic clocks of the Internet. Rest of you servers should follow suit and sync their time to this domain controller after a little while.

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Adding the First Windows 2008 DC into Active Directory

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Make a backup copy of your AD before you go any further.

Install your new server, and join it to the domain as a member server. Before you can run dcpromo on the new 2008 server, you must run adprep on your schema master, to prepare the Active Directory schema to support Windows 2008 domain controllers. The installation DVD contains a directory called sourcesadprep. Go there and run:

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