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Using Terraform to deploy a Tanzu Kubernetes Grid (TKG) Cluster in vSphere with Tanzu 

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A few months back I saw that HashiCorp had released a new Kubernetes (K8s) Provider for Terraform, currently in Alpha state, which enable users to deploy K8s resources using the popular Infrastructure-as-Code (IaC) tool. I thought this would be pretty cool if it works with our vSphere with Tanzu solution, since the Tanzu Kubernetes Grid (TKG) Service uses ClusterAPI via a custom VM Operator to deploy TKG Guest Clusters which is just a fancy way of saying it uses K8s API to deploy more K8s 🙂

UPDATE (04/27/21) - vSphere 7.0 Update 2a has resolved the admission webhook issue and users can now deploy TKG Guest Cluster using K8s Provider for Terraform

The setting up the new K8s provider was pretty straight forward and after spending a few minutes in figuring out how to convert my existing TKG YAML to the required HCL format for Terraform to understand, I was able to to run a terraform "plan" but quickly ran into the following error:

failed: admission webhook "default.mutating.tanzukubernetescluster.run.tanzu.vmware.com" does not support dry run

It looks like our tanzukubernetescluster admission webhooks does not currently support dry run operations which can be quite useful but also common when using Terraform. I figured this was the end of that idea and I ended up just filing a feature enhancement internally for adding this support in the future as I can see this being quite useful for our customers.

After finishing up recent pet project of getting a fully functional vSphere with Tanzu on a homelab budget and just using 32GB of memory, I decided to take another look at this and discovered the required tweak to get this working was super trivial, literally a single line change.

Disclaimer: This is not officially supported by VMware, use at your own risk.

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Five of my favorite enhancements in vSphere 7

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It is very easy to focus on the speeds and feeds of a new major vSphere release such as vSphere 7 which also includes a TON of new and exciting capabilities. However, often times it is the tiny improvements that has the most significant impact to our end users, especially when it comes to usability and operations. In fact, this was further reinforced by Frank Denneman's post on the Reddit with similiar observations.

I have been using vSphere 7 since it was released back in April and I have been discovering a number of new vSphere UI enhancements that has really delighted my overall user experience. I had been sharing these enhancements on Twitter, but figured it was worth a blog post given most of these features were not well known.

Do you have a favorite new feature in vSphere 7 that might not be well known? If so, share by leaving a comment below.

1. Enhanced VM Summary

2. Update and Patch Notifications

3. ESXi Firmware and Driver View

4. ESXi Installation Date + Software Package Details

5. Terminate "stuck" VM

Here are two additional non-UI features that I came to learn about in vSphere 7 that you might also be interested in: Support for HTTPS using wget on ESXi and Guest Customization support for Instant Clones.

Application Discovery in vSphere with VMware Tools 11

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The holidays are just around the corner and hopefully everyone is taking some time off to spend with their families, I know I certainly will! As I start to wind down 2019, I like to use this time catch up on things in my backlog that I was not able to get to in the year. This can range from blog posts that I still need to read, to session recordings that I have attempted to watch but have only made it half way to random notes on topics to potentially investigate in.

When VMware Tools 11 was released back in September, I had noticed an interesting feature that was delivered as part of that release:

Added appInfo to publish information about running applications inside the guest.

I thought this might be something worth looking at when I found some time. One of the nice benefits of having VMware Tools de-coupled from a specific vSphere release is that VMware can now ship additional GuestOS capabilities to customers without requiring them to upgrade the entire vSphere infrastructure, which brings us to the new appInfo feature.

AppInfo is a new plugin within VMware Tools that enables the collection of the "raw" running application processes within a GuestOS. Once enabled, this information is then published into new VM guestinfo property called guestinfo.appinfo which can then be consumed by standard vSphere Automation Tools. This has been one of the most common VM Automation questions I have received over the years from customers and we can now provide additional insights to our administrators on the underlying applications and its version running within a Virtual Machine.

By default, this new AppInfo capability is enabled by default after installing VMware Tools 11 and is supported with both Windows and Linux GuestOS. If you wish to disable this feature, you can find the instructions here. Below is a Windows Server 2016 which I have Active Directory among other applications running which has the appInfo collection enabled.


Once enabled, the default collection period runs every 30 minutes which can be changed following the instructions mentioned earlier. To make this easier to consume, I wrote a quick PowerCLI function called Get-VMApplicationInfo.ps1 which expects a VM object and then retrieves the appInfo details. As part of the output, the results also includes the last discovered time along with an update counter which can be used to track the number of times the collection has ran since enabling.

UPDATE (08/03/20) - Just learned that the latest like VMware Tools 11.1 now includes supports for appInfo capability for Linux GuestOSes. Previously, this was only supported when using a Windows GuestOS but now customers can have this same visibility into their Linux systems. Here is an example running my PowerShell function against the latest TKG Guest Cluster Control Plane VM which you can see both standard Linux processes along with container processes for Kubernetes.

One thing I did notice is that we simply return all instances of a given process and that may or may not be ideal depending on your use case. I have updated my function to include a boolean switch called -UniqueOnly which will automatically filter out the duplicates as shown in the screenshot below.


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