WINDOWS 2008 ACTIVE DIRECTORY
Active
directory is a
brain of windows server network. It’s a
database that keeps huge amount of data and manages all our network machines,
users & groups, services like emails, resources like printers, shared
folders etc.
Domain
Controller (DC) is
a windows server machine which runs Active Directory Domain Services (AD
DS). AD DS –> Active Directory. You may have multiple DC that all have
copies of the same Active Directory database.
Servers
need jobs. We have to decide what a server is going to do. A server will not
have too many jobs. A Server Role is a major job that a server can
perform.
A
DC usually has only two jobs – AD DS (Active Directory Domain Services) and DNS
(Domain Name services).
Domain Name Service (DNS) is
service provided by a server that allows you to find other computers in our
network. DNS allows you to type in name of the machine instead of its IP
address. Without DNS, Active Directory will not work. DNS will work together with Active Directory.
Domain is a namespace or a windows
server domain is a logical group of computers with windows operating system
that share a central directory database. The machines are all named with part
of domain name like globomantics.com and are registered in Active Directory
Database so they can be managed. A
Forest is comprised of all the
domains in the enterprise.
E.g.: A
domain - globomantics.com A Child domain –
Na.globomantics.com
User emails are part of domain
namespace – marcel@globomantics.com
NB: Make sure that you own the name
globomantics.com
We are setting
up 2 almost similar DCs.
DC 1
Computer name:
NY-DC1-2K8
IP Address:
192.168.5.2 (192.168.5.1 is the router)
This DC will create the domain
globomantics.com
DC 2
Computer name: NY-DC2-2K8
IP Address: 192.168.5.3
This DC will join the domain globomantics.com
There are two types of windows server
2008 installations –
Bare Metal - No existing OS on the
HDD
Upgrade- installing over 2003 that
is already installed on the hard drive.
- ·
Install
Windows Server 2008 Standard Edition x64
· After
installing, it will pop with the Initial Task Configuration (ITC). ITC
is a list which groups together all the common tasks we have to do – Configure
time zone info, configure the network settings for 192.168.5.2(with default
gateway: router) and an initial DNS server(router IP address), rename the
computer to NY-DC1-2K8 and reboot, configure automatic updates and feedbacks,
configure remote desktop, turn off ITC.
Set
up a DC
Setting
up a DC has two basic parts
-Installing the AD DS Role (is done
from Server Manager using add roles),
Open Server Manager>Roles>Add
Roles> (skip this page by default) > select the role – Active Directory Domain
Services> Install> click on close this wizard & launch the AD DS
installation wizard (dcpromo.exe)
-Running DCPromo.exe (can be
ran from the link provided in server Manager after AD DS installation or from the search box. dcpromo.exe
is a wizard that sets up AD and promotes a machine to DC status,
(dcpromo.exe)>create
a new domain in a new forest>domain name – globomantics.com>select forest
functional level – windows server 2008> the 1st DC in a forest must
be a global catalog server & can’t be a Read Only DC, install the DNS
server service on the 1st DC> YES>Database Folder –
C:\Windows\NTDS (keeps database file) NTDS
– Network Domain Services, Log Files Folder – C:\Windows\NTDS, SYSVOL Folder
- C:\Windows\SYSVOL SYSVOL – is a shared folder that is
required for DC s to talk each other in a process called replication > Put Directory
services restore mode password which is not same as domain administrator > Also
you can export settings > Reboot on completion
NB: NTDS.dit – The Database file for AD
NB: When you create a domain on your 1st
server, the local Administrator password becomes the domain Administrator
password for all the machines in your domain. So it is better to change the
domain user name and password. Go to Server Manager>Roles>AD DS>AD
Users & Computers>globomantics.com> users>Rename Administrator
& change password.
Now go to Server Manager>AD Sites &
Services>Sites>Rename Default-First-Site-Name>NewYork. So it is more
identifiable.
Thus we have built globomantics.com and a Site
called NewYork. Next we will create the 2nd DC and will join to the
domain.
-
Install
Server 2K8 “Bare Metal”
-
Configure
the basic stuff using the ICT
-
Install
the AD DS Role
-
Run
DCPromo
While
configuring the network, put the IP address as 192.168.5.3, Default gateway as
192.168.5.1 and the DNS Server for the 2nd DC will be the 1st
machine – 192.168.5.2
NB:
Please try to logon to the 1st DC with domain administrator, right
click on network icon> Network & Sharing Center >Manage Network Connections>
See the DNS, it has been changed to 127.0.0.1, because it has taken itself as DNS
server
Now change
the computer name to NY-DC2-2K8.
Go to
start>search DCPromo and run> It will install the AD DS>Add a DC to an
existing forest / existing domain >globomantics.com>Provide Alternate Credentials-
Set using domain username and password> it will find globomantics.com and it
will communicate to DC1>NewYork Site>in additional DC options, check DNS Server
& Global Catalog> YES>Database Folder – C:\Windows\NTDS (keeps
database file) NTDS – Network
Domain Services, Log Files Folder – C:\Windows\NTDS, SYSVOL Folder
- C:\Windows\SYSVOL SYSVOL – is a shared folder that is
required for DC s to talk each other in a process called replication > Put Directory
services restore mode password which is not same as domain administrator > Also
you can export settings > Reboot on completion
NB:
In DC2, Server Manager>View Network Connections>Look for DNS – Preferred DNS
Server– 192.168.5.2 and Alternate DNS Server – 127.0.0.1. In DC1, put Alternate
DNS Server as 192.168.5.3.
The
process of exchanging and recording the changes in AD between the DCs is called
replication. Replication between the 2 DCs is done through Organizational
Unit (OU). So create a new OU in Active Directory Users & Computers on either
of the DC and go to command line and type repadmin /syncall. Check the other
DC ‘s AD Users & Computers to see if the OU also shows up there as well. You
might need to click F5 to refresh the screen to see the changes in Server Manager.
Go
to Server Manager>Roles>AD DS>AD Users &
Computers>globomantics.com>create a new folder in globomantics.com>New
OU>Name as Test Dummy>go to command prompt>type repadmin /syncall
Now if you go to DC2 and check Computer>globomantics.com. If you can find Test Dummy folder, then replication is happening between the 2 DCs. They are talking to each other now :) So incase if one DC blow up you will have a copy in the other DC.
2 DCs are now setup in Golobomantics domain.