VMware ESX

VMkernel ports change automatically when applying a Host Profile


Wonderful little vSphere bug we came across today. Let’s say you have a host with the following VMKernel ports configured on the vSwitch:

-vmk1 = vMotion
-vmk0 = Management Network

When you create a host profile from the host, then apply that profile to a new host you are adding, the VMKernel ports get swapped! They will be:

-vmk1 = Management Network
-vmk0 = vMotion

My co-worker came up with a good workaround. Put your affected host into maintenance mode, then go edit the Host Profile you had applied. It appears the kernel ports are created in the order in the Host Profile. So you just change the order from:

-Management Network


-Management Network

You do this by renaming “vMotion” to something like “vMotion2MN”. Then change the name of “Management Network” to “vMotion” and change “vMotion2MN” to “Management Network”. From here you need to make changes to each port group which are:

-make sure the NICs are ordered correctly
-specifying the correct service for the port group
-making sure the IP is set to explicit

So for the vMotion port group, order the NIC:

Choose vmotion for the service:

Set the explicit IP option:

And for the Management Group, order the NIC:

Choose management for the service:

And set the IP to be explicit:

Make sure to press the OK button in the lower right button after every page or when you navigate to another page, it will lose whatever changes you made. Save the profile and re-apply it to your new host. Now it will recreated the VMKernel ports in the correct order.

About Jason Samuel

Jason Samuel lives in Houston, TX with a primary focus on strategic advisory and architecture of end-user computing, security, enterprise mobility, virtualization, and cloud technologies from Citrix, Microsoft, & VMware. He also has an extensive background in web architecture and networking over his 20+ year career in IT. He is an Author, Speaker, and Local User Group Community Leader. He is certified in several technologies and is 1 of 63 people globally that is a recipient of the prestigious Citrix Technology Professional (CTP) award. He is 1 of 42 people in the world that has been awarded as a VMware EUC Champion and VMware vExpert. He is a featured author on DABCC which provides the latest IT Community News on Cloud, Data Center, Desktop, Mobility, Security, Storage, & Virtualization. In his spare time Jason enjoys writing how-to articles and evangelizing the technologies he works with. Disclaimer: The content and opinions expressed in articles and posts are his own and are by no means associated with his employer.

Recommended for you

1 Comment

  1. Maya

    November 16, 2012 at 3:37 AM

    I perhaps found something a little bit easyer: Just create a Host Profile from the “wrong” Host, the same Problem will occur, means the VMK change again. Apply this Host Profile and that’s it. I will try that out next Week.

Leave a Reply

Your email address will not be published. Required fields are marked *