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Leveraging Instant Clone in vSphere 6.7 for extremely fast Nested ESXi provisioning

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The idea of "Instant Cloning" a Nested ESXi VM (running ESXi in a VM) is not a new concept. In fact, I had shared a solution back in 2015 using the private VMFork APIs. However, what has changed is the ease of consumption, primarily due to the re-architecture of Instant Clone in vSphere 6.7 (more details here and here) which resulted in a public and simplified API. Some of you might ask, why not simply clone a Nested ESXi VM or create a Link Clone? What benefit would I get by using Instant Clone?

The answer is not only speed, but the fact that the instantiated VM is fully operational and ready to start executing where as a traditional full clone or linked clone requires a full OS boot up that can take up to several minutes to deploy and configure. This may not sound like much for a small number of Nested ESXi VMs, but as you increase the number of instances, Instant Clone really shines while still maintaining speed and the instant availability of the VM. As you can imagine, this definitely opens up for some interesting use cases whether it be for personal home lab or educational purposes like VMware HOL. In addition, we also have customers who deploy Nested ESXi not only at high scale but also with a high churn rate for development purposes, think CI/CD type of a workload who can also benefit from Instant Clone.

So how fast are we talking about? Lets say you wanted to test out the latest version of VSAN in vSphere 6.7, you would normally deploy 3 Nested ESXi VMs, power them up and wait for them to be ready on the network. With Instant Clone, you can deploy three fully functional Nested ESXi VMs in just 30seconds! As the VMs are instantly available for consumption, you can start the VSAN enablement workflow immediately and even parts of that can be baked into the Instant Clone workflow. With the ease of provisioning Nested ESXi VMs, you can simply maintain a catalog of ESXi templates which are in "frozen" states and then leverage Instant Clone to deploy just-in-time Nested ESXi environments and discard them once you are done. Pretty slick if you ask me! and something I plan on using going forward.

Disclaimer: Nested ESXi is still not officially supported by VMware. Please use at your own risk.

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Native MAC Learning in vSphere 6.7 removes the need for Promiscuous mode for Nested ESXi

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Over the years, several solutions have been developed here and here to help reduce the impact of promiscuous mode, which is a requirement for running Nested ESXi as a workload. Although these solutions worked extremely well, it however did require users to install additional software to enable this functionality. The most recent solution was a new Learnswitch VMkernel module (released as a VMware Fling) that enables MAC learning capabilities on ESXi.

Today, I am pleased to announce that with the release of vSphere 6.7, the MAC Learning functionality is now available as a native feature of the VMware Distributed Virtual Switch (VDS) and as some of you may have guessed from the title, promiscuous mode is also no longer a requirement for running Nested ESXi! I wanted to take a moment and thank Subin, Jobin, Sriram, Rajeev & Samuel from our Network and Security Business Unit (NSBU) at VMware who worked tirelessly to get this integrated and productized into ESXi. Not only will this benefit Nested ESXi workloads but also other solutions and use cases that have historically required the use of promiscuous mode. For customers who are still running ESXi 6.0 or 6.5, you should continue to use the Learnswitch Fling until you fully upgrade to vSphere 6.7.

To use the new MAC Learning functionality, you will of course need to upgrade to vSphere 6.7 (both vCenter and ESXi) but also upgrade to the latest VDS version which is 6.6. MAC Learning can be enabled on a per Distributed Virtual Portgroup bases and today, it is only available when using the vSphere API. For those that have used the VDS API to manage their VDS, you will simply use the existing ReconfigureDVPortgroup_Task() method and in 6.7, there now a new macManagementPolicy property which allows you to enable and define your MAC Learning settings. This new MAC Management Policy will also be the new preferred method for managing security policies going forward for a DV Portgroup and the previous security policy settings should no longer be used.

Disclaimer: Nested ESXi is still not officially supported by VMware. Please use at your own risk.  [Read more...]

Nested ESXi 6.7 Virtual Appliance Updates

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I know many of you have been pinging me the last couple of days for an updated Nested ESXi 6.7 Virtual Appliance and I have just finished my strict quality control process 🙂 The only minor change with the 6.7 appliance is the VM is now configured with EFI Firmware, where as in the past it was set to BIOS. As of vSphere 6.5+ appliances, the customization scripts are automatically removed by default which means that customers can turn on Secure Boot feature post-deployment without having to perform any manual workarounds. In addition, you will find a few more updates related to the updated ESXi appliance below. I hope you enjoy these free resources to help learn and plan for your vSphere 6.7 upgrades, Happy Friday!

Note: These solutions are all developed during off hours and does take a considerable amount of time/effort to manage and update. Although they are provided to you as a free solution, the development itself is not 🙂

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Nested ESXi 6.7 Appliance:

ESXi 6.7 Virtual Appliance (Nested_ESXi6.7_Appliance_Template_v1.ova)

Nested ESXi Content Library

If you are using my Nested ESXi Content Library, I have updated it to include the latest 6.7 Appliance. Simply refresh your Content Library to automatically pull down the image or you can create a new Content Library by subscribing to the following URL: https://download3.vmware.com/software/vmw-tools/lib.json For more details, please take a look at this blog post here.

vGhetto vSphere Automated Lab Deployment:

For those that use my vGhetto lab deployment script to automate a fully functional vSphere environment, I have created a new version of the script to support vSphere 6.7 which you can find more details here. One neat feature that was suggested by Christian Mohn awhile back was the ability to get more insights to what is happening during the VCSA deployment since the verbosity can be quite distracting on the primary screen. There is now a new $enableVerboseLoggingToNewShell variable that is enabled by default to spawn a new PowerShell console that will watch the VCSA installer logs, so you have a better idea of what is going on.