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Uninstalling VCenter with managed hosts?

Posted on 2014-01-03
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Last Modified: 2014-01-07
HI,

I have vcenter 5.5 installed, but it's crashed and won't start.  I want to do a reinstall as advised by our support.  This is basically to give us a fresh database.

But I have a question I'd like a second opinion on: If I uninstall the vcenter even though we have a couple of hosts attached to it (in a cluster) will we run into issues?

Thanks
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Question by:ts11
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 39754673
None whatsoever.

Clearly DRS will not function or vMotion.

Running VMs will no be affected, if you have configured VMware HA, this will continue to function, because VMware vSphere vCenter Server, is only used to deploy agents, and configure the HA agents, on the host servers.

So you are fine to uninstall. To make it easier, Remove the Hosts from vCenter Server before uninstalling vCenter Server from Windows.

You could also consider the vCenter Server Appliance.
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Author Comment

by:ts11
ID: 39754875
Thanks.  The current installation is very basic, just vcenter with update manager and two hosts.

I would like to remove the hosts before uninstalling, but vcenter crashed and won't start, as per my OP.

Good to know it won't be an issue.  Thanks.
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LVL 118
ID: 39755045
Connect to each host with vSphere Client and dissociate them from vCenter Server.
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Author Comment

by:ts11
ID: 39755334
I wasn't aware that was possible to do in the vsphere client connecting directly to a single host? My hosts are running 4.1 if that makes a difference.

If I read your early post right, it will be fine to just do a straight uninstall?
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LVL 118
ID: 39755884
Yes, fine to complete an uninstall.

Yes you can connect directly to any ESX/ESXi server with the vSphere Client.
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Author Comment

by:ts11
ID: 39756625
Ok, thanks.

Sorry, my question wasn't clear.  I meant to say "I wasn't aware it was possible disassociate a host from vcenter by connecting to the host directly?" Is there an option in vsphere client to do that?
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LVL 118
ID: 39756670
Yes, connect directly to the ESXi host using the vSphere Client.

On the Summary Page (first page), Bottom Right, there is a link

Disassociate Host from vCenter Server - click it,
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

Author Comment

by:ts11
ID: 39757891
The Host Management part? Only has the option to reconnect - does this mean it's already done it? I've attached the screenshot.
hostvsphere.PNG
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LVL 118
ID: 39757943
Yes, it does.

It could be your server has failed, and it's no longer commuincating with the ESXi host.

Hence it's in a disconnected state.

It would normally show, if connected...

Disassociate host from vCenter Server1.jpg
Disassociate host from vCenter Server
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Author Comment

by:ts11
ID: 39760699
Yes, the vcenter service itself crashed which is why I need to reinstall it.  Happy that our hosts won't be affected by this.  Will do this tomorrow then close the thread once complete :)
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LVL 118
ID: 39760737
No problems
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Author Comment

by:ts11
ID: 39761046
Just got prompted with this as the install was about to complete.  I'm using a fresh db, so I assume its ok to proceed without affecting any other operations?
vcenterinv.png
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Author Comment

by:ts11
ID: 39761078
went ahead with it and it's fine.  thanks.
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LVL 118
ID: 39761456
No problems.
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