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How to change hardware serial number for Mac OS X Guest?

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There was an interesting question that was asked the other day about changing the hardware serial number for an Apple Mac OS X guest as the generated serial number is not compatible with services such as Apple Caching Service or iMessage. I recall seeing this question get asked awhile back, but I could not immediately find the answer but thanks to Darius Davis (VMware Engineer) who provided the quick answer.

We have a facility to generate a "short" serial number which should be suitable for recent Apple software.  The option is enabled by default for OS X 10.9 guests.  To enable it for earlier guest OS versions, you'll need to power off your virtual machine and edit its configuration to add the following option:

SMBIOS.use12CharSerialNumber = "TRUE"

As mentioned by Darius, if you are running Mac OS X VM prior to 10.9 (Mavericks) you will need to add the following advanced VM setting by first powering it off and then add the above setting. There are two recommended ways of performing this change using either the vSphere C# Client or vSphere Web Client and instructions are listed below.

Note: Though you can also edit the VMX configuration file by hand, for those that are not familiar on how to reload the configuration file, it is best you use the UI.

vSphere C# Client:
Edit Settings -> VM Options -> Advanced -> Edit Configurations

vSphere Web Client:
Edit Settings -> Options -> Advanced -> General -> Configuration Parameters

Once you have added the advanced setting, you can now power back on your Mac OS X VM and when you click on the "About this Mac" option on the upper left hand side of the Apple icon you should see the Mac OS X version string. Click on the version string twice and you should now see the serial number that is generated which should not be longer than 12 characters.

As of writing this article the latest Mac OS X 10.9 (Mavericks) is not yet officially on the VMware HCL for latest release of ESXi 5.5 as the OS just came out recently, however it is still possible to create the a Mac OS X 10.9 guest using the new vSphere Web Client. Be sure to keep your eyes on the VMware HCL for support of Mac OS X 10.9 on ESXi 5.5 here.

Can You Backup & Restore Apple Mac OS X Guests Using vSphere Data Protection (VDP)?

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It is really cool to see more and more customers show interest in running Apple Mac OS X on vSphere. Just the other day there was another interesting question that was raised from a customer asking whether vSphere Data Protection (VDP) would be able to backup and restore Mac OS X guests.  Apparently there is still an assumption that VMware Tools do not exist for Mac OS X guests? Perhaps virtualizing Mac OS X is still relatively new for some folks, but it is just like any other guest operating system that is supported on vSphere.

I think the following two statements should help clarify any confusion that may exist:

  • To virtualize an Apple Mac OS X guest, you need to be running vSphere on Apple hardware. This is due to a requirement in Apple's EULA and is also enforced within the vSphere platform. You can get more details in this article. 
  • VMware Tools does exist for Apple Mac OS X guests, take a look at this article for more details.

Now, if we take a look at VDP's evaluation guide on page 4 we will see the prerequisite for backing up a guest OS is pretty straight forward:

At least one virtual machine running a supported guest operating system (OS) with VMware Tools installed

Since Apple Mac OS X (10.8, 10.7, 10.6 and 10.5) is a supported guest operating system and we have VMware Tools for this operating system, then yes VDP can be used to backup and restore an Apple Mac OS X guest. To demonstrate that this actually works, I have a Mac OS X 10.7 VM running in my home lab (Apple Mac Mini which is not officially supported) and I have deployed the latest version of VDP.

I then setup the backup job for the Mac OS X guests using the super simple VDP backup wizard and then initiate a backup.

Now, let's say I accidentally fat fingered an operation and deleted this VM. Uh oh!? What am I to do? Well don't worry, VDP is there to the rescue!

To restore the VM, it is simply going through the VDP restore wizard and in just a few minutes, I  have now recovered my Mac OS X guest and it is up and running again!

I have said this many times, but it still amazes me on the number of guest operating systems vSphere supports! There really is no workload that vSphere can not virtualize! So if you have any use cases for Mac OS X workloads, rest assure you can safely virtualize it and back it up on vSphere.

Note: Though I showed using VMware VDP as the backup/recovery solution, you should also be able to leverage both VMware vSphere Replication as well as VMware Site Recovery Manager.

number of guest OSes the vSphere platform supports

VMware Tools For Apple Mac OS X Guests?

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With the release of vSphere 5, virtualizing Apple Mac OS X as a guest OS was possible and fully supported from VMware. To do so, you would need to be run ESXi on Apple hardware either the now deprecated Apple XServe 3.1 or an Apple Mac Pro. A comment that came up yesterday on Twitter was that VMware Tools did not exists for Mac OS X guests and this would make it difficult to manage Mac OS X guests on vSphere. I guess it may not be that well known or just an assumption, but VMware Tools does in fact exists for Mac OS X guests and it is also documented in the VMware Tools installation guide.

It is still amazing to me to see the number of guest OSes the vSphere platform supports and perhaps virtualizing Mac OS X is still relatively new for folks and hence the initial assumption about VMware Tools not being available. In any case, I thought I take you through a few screenshots of installing VMware Tools for a Mac OS X 10.7 guests running on my Apple Mac Mini.

In the screenshot below, we can see that VMware Tools is not detected in the guest OS and we have a option to install VMware Tools, so we go ahead and click on that.

This will mount the darwin.iso to the VM from the vmimages directory of the ESXi host and you can proceed with the VMware Tools installation.

Upon finishing the installation, you will be asked to reboot the guest OS and now when we take a look at the VM summary view, we can see VMware Tools is now running in our Mac OS X guests.

Note: For instructions on installing Apple Mac OS X as a guest OS on vSphere, please refer to this tech note.