vSphere Virtual Center Linked Mode Prerequisites:
Well, yes this article has two headers or titles. Guess what they are almost identical.
I have seen “Error 28039. Setup cannot join vCenter Server to the linked mode group” all over the net & without any one posting resolution for it. hmmmm, how did I find out about this error and what made me looking for resolutions, well I had faced this same ugly error in my own lab. The resolution for it was nothing more than following the pre-requisite to vSphere Virtual Center Linked Mode which most people ignore. Below is the pre-requisite that you must follow for a successful installation of vCenter Linked mode & I will highligh the mostly missed one.
All the requirements for standalone vCenter Server systems apply to Linked Mode systems. In addition, to the following requirements:
The following requirements apply to each vCenter Server system that is a member of a Linked Mode group:
- DNS must be operational for Linked Mode replication to work.
- 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.
- When adding 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. <== This one is what most people miss. What you really have to do in this step is to create a domain service account & add it to the local administrator group of your original virtual center & your new linked virtual center machines. Then login with this account to the new machine to be installed with linked vCenter & when asked for the service account make sure you chose to use the new created service account credintial instead of the default local admin account.
- All vCenter Server instances must have network time synchronization. The vCenter Server installer
validates that the machine clocks are not more than 5 minutes apart.
If you satisfy all of the above requirements specially the DNS one & the service account one(marked in red) you should have a nice successful installation.
Good luck with your installation, and hope to hear some good comments of success story below.