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Automating bulk OPNsense Unbound DNS host overrides

03.25.2025 by William Lam // Leave a Comment

I recently deployed OPNsense in my homelab, which I will be using it to setup my VMware Cloud Foundation (VCF) environment. A critical part infrastructure service that is often miss-configured is DNS and OPNsense provides a simple way add your custom DNS entries (forward/reverse) called Host Overrides, which uses Unbound DNS behind the scenes.

Like most, I have a number of DNS entries that I would like to pre-create and the UI is not exactly the quickest for any type of "bulk" operation as each entry is added sequentially.


Luckily, OPNsense does have a REST API for Unbound functions, but the documentation was not very useful as it just direct users to use the browser to extract the JSON payload, while something I am comfortable with, I think that is not what I expected from something called an API Reference ...

In any case, this was a simple enough API, that I was able to create a quick PowerShell script to parse a CSV file that contains the list of FQDN, IP Address and Description and then perform a bulk create since the API itself was also sequential in nature 🙁

[Read more...]

Categories // Automation Tags // OPNsense

ESXi on GMKtec NucBox K11

03.20.2025 by William Lam // 3 Comments

The GMKtec NucBox has been growing in popularity amongst the VMware community as a modern AMD Ryzen-based alternative to the Intel/ASUS NUC, offering many of the same advantages while avoiding some of the drawbacks of Intel's Hybrid CPU architecture.

In preparation for my upcoming session at the inaugural VMUG Connect Conference in April, I have been experimenting with several modern hardware options, with the goal of deploying the full VMware Cloud Foundation (VCF) solution for use within a lab environment, while still staying budget friendly!

I know several folks have had great success with the GMKtec NucBox K8 Plus and it just so happens, while browsing the GMKtec website, I noticed an additional NucBox has just been released called the K11.


While the differences between the K8 Plus and K11 is pretty minimal, I was interested in validating some new hardware add-ons, so getting the latest hardware would hopefully give me the best chance!

In collaboration with the VMware {Code} team, I was able to get hands on with the latest GMKtec NucBox K11!

[Read more...]

Categories // ESXi, Home Lab, VMware Cloud Foundation Tags // GMKtec, VMware Cloud Foundation

Quick Tip - VMware Cloud Foundation (VCF) Bringup fails without persistent ESX-OSData

03.12.2025 by William Lam // 5 Comments

You will never run into this problem if you follow current recommended practices to install the ESX-OSData volume on a persistent storage device that could either be dedicated and/or co-located your ESXi installation.

For those deploying VMware Cloud Foundation (VCF) in a lab environment, you might attempt to reserve the limited number of storage devices for use with vSAN and decide to install ESXi on a USB device, which is perfectly fine but if you do not select a persistent storage device for the ESX-OSData volume, then it will default to use the ESXi ramdisk.

I recently observed that if you have such a configuration, the VCF Cloud Builder Bringup process will fail after attempting (three times) to re-deploy the vCenter Server Appliance (VCSA).


As you can see from the screenshot above,  VCF Cloud Builder UI does not provide any details and ask users to look at the vCenter Server installation logs.

[Read more...]

Categories // Automation, VCSA, VMware Cloud Foundation, vSphere Tags // vLCM, VMware Cloud Foundation

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William is Distinguished Platform Engineering Architect in the VMware Cloud Foundation (VCF) Division at Broadcom. His primary focus is helping customers and partners build, run and operate a modern Private Cloud using the VMware Cloud Foundation (VCF) platform.

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Recent

  • VMUG Connect 2025 - Minimal VMware Cloud Foundation (VCF) 5.x in a Box  05/15/2025
  • Programmatically accessing the Broadcom Compatibility Guide (BCG) 05/06/2025
  • Quick Tip - Validating Broadcom Download Token  05/01/2025
  • Supported chipsets for the USB Network Native Driver for ESXi Fling 04/23/2025
  • vCenter Identity Federation with Authelia 04/16/2025

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