A Linked Mode group allows you to log in to any single instance of vCenter Server and view and manage
the inventories of all the vCenter Server systems in the group.
You can join multiple vCenter Server systems to form a Linked Mode group. You can configure a Linked
Mode group during vCenter Server installation or after vCenter Server is installed.
To join a vCenter Server group, you enter the fully qualified domain name (or IP address) of a remote
machine on which vCenter Server is running. The remote machine can be any vCenter Server instance that
is, or will become, a member of the Linked Mode group.
You must also provide the LDAP port number of the remote vCenter Server instance.
vCenter Server instances in a group replicate shared global data to the LDAP directory. The global data
includes the following information for each vCenter Server instance:
Connection information (IP and ports)
Certificates
Licensing information
User roles
The vSphere Web Client can connect to a Linked Mode vCenter Server environment only if the
vSphere Web Client is logged in to vCenter Server as a domain user. For example, if the Linked Mode
vCenter Servers are installed with user "abc" added to domain "xyz," the vSphere Web Client user should
log in using xyz\abc.
NOTE vCenter Server 5.1 can be joined in a Linked Mode group only with other instances of vCenter Server 5.1. Do not join a version 5.1 vCenter Server instance to a version 5.0 or earlier vCenter Server instance
Linked Mode Considerations for vCenter Server
Consider several issues before you configure a Linked Mode group.
Before you configure a Linked Mode group, consider the following issues.
n If you are upgrading a version 5.x vCenter Server that is part of a Linked Mode group, it will not be
removed from the group. If you are upgrading a pre-5.0 vCenter Server that is part of a Linked Mode
group, it will be removed from the group. vCenter Server does not support Linked Mode groups that
contain both version 5.x and pre-5.0 versions of vCenter Server. Similarly, vCenter Server does not
support Linked Mode groups that contain different 5.x versions of vCenter Server or different versions
of vCenter Single Sign-On. After all 5.x vCenter Server and vCenter Single Sign-On instances in a
Linked Mode group are upgraded to the same 5.x version, you can rejoin them.
Each vCenter Server user sees the vCenter Server instances on which they have valid permissions.
When you set up your vCenter Server Linked Mode group, you must install the first vCenter Server as
a standalone instance because you do not yet have a remote vCenter Server machine to join. Subsequent
vCenter Server instances can join the first vCenter Server or other vCenter Server instances that have
joined the Linked Mode group.
If you join a vCenter Server to a standalone instance that is not part of a domain, you must add the
standalone instance to a domain and add a domain user as an administrator.
The vCenter Server instances in a Linked Mode group do not need to have the same domain user login.
The instances can run under different domain accounts. By default, they run as the LocalSystem
account of the machine on which they are running, which means that they are different accounts.
During vCenter Server installation, if you enter an IP address for the remote instance of vCenter Server,
the installer converts it into a fully qualified domain name.
CAUTION If you need to uninstall and reinstall vCenter Server on more than one member of a Linked Mode group, do so with a single vCenter Server at a time. Uninstalling and reinstalling multiple linked vCenter Servers at the same time is not supported, and can cause errors that prevent vCenter Server from connecting to vCenter Inventory Service. If it is necessary to uninstall and reinstall multiple linked vCenter Servers at the same time, isolate them from the Linked Mode group first, and rejoin them to the Linked Mode group after the reinstallation is complete.
Linked Mode Prerequisites for vCenter Server
Prepare the vCenter Server system for joining a Linked Mode group.
All the requirements for standalone vCenter Server systems apply to Linked Mode systems.
The following requirements apply to each vCenter Server system that is a member of a Linked Mode group:
n vCenter Server does not support Linked Mode groups that contain both version 5.x and pre-5.0 versions
of vCenter Server. Similarly, vCenter Server does not support Linked Mode groups that contain
different 5.x versions of vCenter Server or different versions of vCenter Single Sign-On. After all 5.x
vCenter Server and vCenter Single Sign-On instances in a Linked Mode group are upgraded to the
same 5.x version, you can rejoin them.
n Make sure that all vCenter Servers in a Linked Mode group are registered to the same vCenter Single
Sign-On server.
n To join a vCenter Server to another vCenter Server in Linked Mode, the currently logged-in user who is
performing the join operation must have access to the vCenter Server database of each vCenter Server.
n When you join a vCenter Server instance to a Linked Mode group, the installer must be run by a
domain user who is an administrator on both the machine where vCenter Server is installed and the
target machine of the Linked Mode group.
n When you join a vCenter Server instance to a Linked Mode group, if User Account Control (UAC) is
enabled on the machine, the join operation requires elevated privileges through the Run as
administrator option. This is true even if the logged-in user is a domain administrator user.
n To join a Linked Mode group the vCenter Server must be in evaluation mode or licensed as a Standard
edition. vCenter Server Foundation and vCenter Server Essentials editions do not support Linked
Mode.
n DNS must be operational for Linked Mode replication to work.
n The vCenter Server instances in a Linked Mode group can be in different domains if the domains have a
two-way trust relationship. Each domain must trust the other domains on which vCenter Server
instances are installed.
n All vCenter Server instances must have network time synchronization. The vCenter Server installer
validates that the machine clocks are not more than five minutes apart.
Joining a Linked Mode Group During and After Installation
You can join a system to a Linked Mode group during the vCenter Server installation or after you install
vCenter Server.
For example, suppose you have three machines on which you want to install vCenter Server. You want the
three instances to be members of a Linked Mode group.
1 On Machine 1, you install vCenter Server as a standalone instance because you do not have a remote
vCenter Server machine to join.
2 On Machine 2, you install vCenter Server, choose to join a Linked Mode group, and provide the fully
qualified domain name of Machine 1.
3 On Machine 3, you upgrade to vCenter Server 5.x. After the upgrade, you configure Machine 3 to join
either Machine 1 or Machine 2. Machine 1, Machine 2, and Machine 3 are now members of a Linked
Mode group.
Chapter 5 After You Install vCenter Server
VMware, Inc. 111
Join a Linked Mode Group After Installation
After installing vCenter Server, you can join a vCenter Server to a Linked Mode group.
Prerequisites
.
NOTE vCenter Server does not support Linked Mode groups that contain both version 5.x and pre-5.0 versions of vCenter Server. Similarly, vCenter Server does not support Linked Mode groups that contain different 5.x versions of vCenter Server or different versions of vCenter Single Sign-On. After all 5.x vCenter Server and vCenter Single Sign-On instances in a Linked Mode group are upgraded to the same 5.x version, you can rejoin them.
Procedure
1 Select Start > All Programs > VMware > vCenter Server Linked Mode Configuration.
2 Click Next.
3 Select Modify linked mode configuration and click Next.
4 Click Join this vCenter Server instance to an existing linked mode group or another instance and
click Next.
5 Enter the server name and LDAP port number of a remote vCenter Server instance that is a member of
the group and click Next.
If you enter an IP address for the remote server, the installer converts it into a fully qualified domain
name.
6 If the vCenter Server installer detects a role conflict, select how to resolve the conflict.
Option Action
Yes, let VMware vCenter Server
resolve the conflicts for me
Click Next.
The role on the joining system is renamed to vcenter_namerole_name, where
vcenter_name is the name of the vCenter Server system that is joining the
Linked Mode group, and role_name is the name of the original role.
No, I'll resolve the conflicts myself To resolve the conflicts manually:
a Using the vSphere Web Client, log in to one of the vCenter Server
systems using an account with Administrator privileges.
b Rename the conflicting role.
c Close the vSphere Web Client session and return to the vCenter Server
installer.
d Click Back and click Next.
The installation continues without conflicts.
A conflict results if the joining system and the Linked Mode group each contain a role with the same
name but with different privileges.
7 Click Finish.
vCenter Server restarts. Depending on the size of your inventory, the change to Linked Mode might
take from a few seconds to a few minutes to complete.
Isolate a vCenter Server Instance from a Linked Mode Group
You can isolate a vCenter Server instance from a Linked Mode group.
Procedure
1 Select Start > All Programs > VMware > vCenter Server Linked Mode Configuration.
2 Click Modify linked mode configuration and click Next.
3 Click Isolate this vCenter Server instance from linked mode group and click Next.
4 Click Continue and click Finish.
vCenter Server restarts. Depending on the size of your inventory, the change to Linked Mode
configuration might take from a few seconds to a few minutes to complete.
The vCenter Server instance is no longer part of the Linked Mode group.
the inventories of all the vCenter Server systems in the group.
You can join multiple vCenter Server systems to form a Linked Mode group. You can configure a Linked
Mode group during vCenter Server installation or after vCenter Server is installed.
To join a vCenter Server group, you enter the fully qualified domain name (or IP address) of a remote
machine on which vCenter Server is running. The remote machine can be any vCenter Server instance that
is, or will become, a member of the Linked Mode group.
You must also provide the LDAP port number of the remote vCenter Server instance.
vCenter Server instances in a group replicate shared global data to the LDAP directory. The global data
includes the following information for each vCenter Server instance:
Connection information (IP and ports)
Certificates
Licensing information
User roles
The vSphere Web Client can connect to a Linked Mode vCenter Server environment only if the
vSphere Web Client is logged in to vCenter Server as a domain user. For example, if the Linked Mode
vCenter Servers are installed with user "abc" added to domain "xyz," the vSphere Web Client user should
log in using xyz\abc.
NOTE vCenter Server 5.1 can be joined in a Linked Mode group only with other instances of vCenter Server 5.1. Do not join a version 5.1 vCenter Server instance to a version 5.0 or earlier vCenter Server instance
Linked Mode Considerations for vCenter Server
Consider several issues before you configure a Linked Mode group.
Before you configure a Linked Mode group, consider the following issues.
n If you are upgrading a version 5.x vCenter Server that is part of a Linked Mode group, it will not be
removed from the group. If you are upgrading a pre-5.0 vCenter Server that is part of a Linked Mode
group, it will be removed from the group. vCenter Server does not support Linked Mode groups that
contain both version 5.x and pre-5.0 versions of vCenter Server. Similarly, vCenter Server does not
support Linked Mode groups that contain different 5.x versions of vCenter Server or different versions
of vCenter Single Sign-On. After all 5.x vCenter Server and vCenter Single Sign-On instances in a
Linked Mode group are upgraded to the same 5.x version, you can rejoin them.
Each vCenter Server user sees the vCenter Server instances on which they have valid permissions.
When you set up your vCenter Server Linked Mode group, you must install the first vCenter Server as
a standalone instance because you do not yet have a remote vCenter Server machine to join. Subsequent
vCenter Server instances can join the first vCenter Server or other vCenter Server instances that have
joined the Linked Mode group.
If you join a vCenter Server to a standalone instance that is not part of a domain, you must add the
standalone instance to a domain and add a domain user as an administrator.
The vCenter Server instances in a Linked Mode group do not need to have the same domain user login.
The instances can run under different domain accounts. By default, they run as the LocalSystem
account of the machine on which they are running, which means that they are different accounts.
During vCenter Server installation, if you enter an IP address for the remote instance of vCenter Server,
the installer converts it into a fully qualified domain name.
CAUTION If you need to uninstall and reinstall vCenter Server on more than one member of a Linked Mode group, do so with a single vCenter Server at a time. Uninstalling and reinstalling multiple linked vCenter Servers at the same time is not supported, and can cause errors that prevent vCenter Server from connecting to vCenter Inventory Service. If it is necessary to uninstall and reinstall multiple linked vCenter Servers at the same time, isolate them from the Linked Mode group first, and rejoin them to the Linked Mode group after the reinstallation is complete.
Linked Mode Prerequisites for vCenter Server
Prepare the vCenter Server system for joining a Linked Mode group.
All the requirements for standalone vCenter Server systems apply to Linked Mode systems.
The following requirements apply to each vCenter Server system that is a member of a Linked Mode group:
n vCenter Server does not support Linked Mode groups that contain both version 5.x and pre-5.0 versions
of vCenter Server. Similarly, vCenter Server does not support Linked Mode groups that contain
different 5.x versions of vCenter Server or different versions of vCenter Single Sign-On. After all 5.x
vCenter Server and vCenter Single Sign-On instances in a Linked Mode group are upgraded to the
same 5.x version, you can rejoin them.
n Make sure that all vCenter Servers in a Linked Mode group are registered to the same vCenter Single
Sign-On server.
n To join a vCenter Server to another vCenter Server in Linked Mode, the currently logged-in user who is
performing the join operation must have access to the vCenter Server database of each vCenter Server.
n When you join a vCenter Server instance to a Linked Mode group, the installer must be run by a
domain user who is an administrator on both the machine where vCenter Server is installed and the
target machine of the Linked Mode group.
n When you join a vCenter Server instance to a Linked Mode group, if User Account Control (UAC) is
enabled on the machine, the join operation requires elevated privileges through the Run as
administrator option. This is true even if the logged-in user is a domain administrator user.
n To join a Linked Mode group the vCenter Server must be in evaluation mode or licensed as a Standard
edition. vCenter Server Foundation and vCenter Server Essentials editions do not support Linked
Mode.
n DNS must be operational for Linked Mode replication to work.
n The vCenter Server instances in a Linked Mode group can be in different domains if the domains have a
two-way trust relationship. Each domain must trust the other domains on which vCenter Server
instances are installed.
n All vCenter Server instances must have network time synchronization. The vCenter Server installer
validates that the machine clocks are not more than five minutes apart.
Joining a Linked Mode Group During and After Installation
You can join a system to a Linked Mode group during the vCenter Server installation or after you install
vCenter Server.
For example, suppose you have three machines on which you want to install vCenter Server. You want the
three instances to be members of a Linked Mode group.
1 On Machine 1, you install vCenter Server as a standalone instance because you do not have a remote
vCenter Server machine to join.
2 On Machine 2, you install vCenter Server, choose to join a Linked Mode group, and provide the fully
qualified domain name of Machine 1.
3 On Machine 3, you upgrade to vCenter Server 5.x. After the upgrade, you configure Machine 3 to join
either Machine 1 or Machine 2. Machine 1, Machine 2, and Machine 3 are now members of a Linked
Mode group.
Chapter 5 After You Install vCenter Server
VMware, Inc. 111
Join a Linked Mode Group After Installation
After installing vCenter Server, you can join a vCenter Server to a Linked Mode group.
Prerequisites
.
NOTE vCenter Server does not support Linked Mode groups that contain both version 5.x and pre-5.0 versions of vCenter Server. Similarly, vCenter Server does not support Linked Mode groups that contain different 5.x versions of vCenter Server or different versions of vCenter Single Sign-On. After all 5.x vCenter Server and vCenter Single Sign-On instances in a Linked Mode group are upgraded to the same 5.x version, you can rejoin them.
Procedure
1 Select Start > All Programs > VMware > vCenter Server Linked Mode Configuration.
2 Click Next.
3 Select Modify linked mode configuration and click Next.
4 Click Join this vCenter Server instance to an existing linked mode group or another instance and
click Next.
5 Enter the server name and LDAP port number of a remote vCenter Server instance that is a member of
the group and click Next.
If you enter an IP address for the remote server, the installer converts it into a fully qualified domain
name.
6 If the vCenter Server installer detects a role conflict, select how to resolve the conflict.
Option Action
Yes, let VMware vCenter Server
resolve the conflicts for me
Click Next.
The role on the joining system is renamed to vcenter_namerole_name, where
vcenter_name is the name of the vCenter Server system that is joining the
Linked Mode group, and role_name is the name of the original role.
No, I'll resolve the conflicts myself To resolve the conflicts manually:
a Using the vSphere Web Client, log in to one of the vCenter Server
systems using an account with Administrator privileges.
b Rename the conflicting role.
c Close the vSphere Web Client session and return to the vCenter Server
installer.
d Click Back and click Next.
The installation continues without conflicts.
A conflict results if the joining system and the Linked Mode group each contain a role with the same
name but with different privileges.
7 Click Finish.
vCenter Server restarts. Depending on the size of your inventory, the change to Linked Mode might
take from a few seconds to a few minutes to complete.
Isolate a vCenter Server Instance from a Linked Mode Group
You can isolate a vCenter Server instance from a Linked Mode group.
Procedure
1 Select Start > All Programs > VMware > vCenter Server Linked Mode Configuration.
2 Click Modify linked mode configuration and click Next.
3 Click Isolate this vCenter Server instance from linked mode group and click Next.
4 Click Continue and click Finish.
vCenter Server restarts. Depending on the size of your inventory, the change to Linked Mode
configuration might take from a few seconds to a few minutes to complete.
The vCenter Server instance is no longer part of the Linked Mode group.
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