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Configuring dnsmasq as PXE Server for ESXi 

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One really cool thing that I came to learn while setting up the infrastructure to network boot the latest Raspberry Pi 4 was the use of dnsmasq, which I have used in the past but I did not realize it could do so much more. In addition to providing DNS services, it can also be configured to run TFTP and provide DHCP capabilities which can then be used to support PXE installations.

Another neat feature of dnsmasq is ability to proxy to an existing DHCP server which is extremely useful for anyone with an existing DHCP infrastructure. Given the simplicity of dnsmasq and having already set this up for the rPI, I figure it would also be useful to take folks through in setting up dnsmasq to also support ESXi installations over PXE, since this still comes up from new folks just getting started with ESXi kickstart automation.

For more details about PXE installation of ESXi, I highly recommend this whitepaper and although it states 6.0, the concepts and configurations are still applicable to the latest ESXi 7.0 release.

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How to patch Intel NUC 10 with latest ESXi 7.0 update?

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vSphere 7.0b was just released last week and one of the important fixes was to resolve an issue where Nested ESXi VMs were crashing upon powering on an inner-guest VM. This looks to have also affect newer generations of CPUs including Intel's 10th Gen Comet Lake which is also found in the latest 10th Gen Intel NUCs (Frost Canyon).

A number of folks quickly found that if you simply applied the ESXi 7.0b patch, an unexpected behavior occurred on the 10th Gen Intel NUCs and the onboard networking was lost upon a reboot. This occurs as the original ne1000 driver which had been replaced with a newer version found within ESXi 7.0b no longer recognizes the onboard Intel NIC. The solution is quite simple, create a new Image Profile that contains the Intel NUC NIC Driver.

Several of you have asked for instructions and although this is a pretty common vSphere workflow, I have documented the two supported options using the vSphere Image Builder utility but there are definitely other methods which will have the same results. If you have access to a vCenter Server 6.7 or newer, I recommend using the Image Builder UI. If vCenter Server access is not available, then you can use Image Builder with PowerCLI, however you will need to have access to a Windows machine as the Image Builder cmdlet is not supported with PowerCLI Core.

Note: There is currently a known bug with the Image Builder UI when using vSphere 7 which will prevent you from authoring a new Image Profile. A workaround would be to deploy a VCSA 6.7 which does not have this issue when looking to use the Image Builder UI.

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Quick Tip - Suppress new core dump warning in ESXi 7.0

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You may have noticed new warning message after installing ESXi 7.0, this can happen if your ESXi installation is on a smaller local disk (Nested ESXi Appliance would also be affected) which does not have enough capacity for setting up a core dump target or if ESXi is booting from USB which also does not support core dumps by default.

No coredump target has been configured. Host core dumps cannot be saved.


It is certainly recommended that you have a core dump target configured, especially for Production systems. However, if you wish to suppress the warning, there is an ESXi Advance Setting which you can toggle called UserVars.SuppressCoredumpWarning (can be configure using Embedded ESXi Host Client or vSphere UI in vCenter Server) as well as ESXCLI. Below is the command to suppress the warning:

esxcli system settings advanced set -o /UserVars/SuppressCoredumpWarning -i 1