Another way to enable management traffic on ESXi

Here is another way in you can enable the management traffic type on a VMkernel interface in ESXi without having to resort to using the vSphere API, this especially useful when automating a kickstart installation.

When you enable a specific vmkX interface (esxcfg-vmknic -l) to allow for the management traffic type, there is an entry that is made in the /etc/vmware/hostd/hostsvc.xml file. The specific interface is denoted by a unique nic id which starts off at 0000 and is incremented by one for additional VMkernel interfaces that are added.

If you add a second VMkernel interface called vmk1 and you wanted to also enable it for management traffic, the file would look like the following:

For the changes to take effect, you will need to restart hostd agent by running /etc/init.d/hostd restart. You will also need refresh the network sub-system by using vim-cmd hostsvc/net/refresh which will refresh the vSphere Client view else you will have to do it manually before you can see the update.

This is probably overkill, but I decided to write a simple script in which you can pass the VMkernel interface name and the script will update hostsvc.xml file with the proper nic id/etc. Here is an example for enabling management traffic for vmk1:

Download: enableMgmt.sh

If you would like to integrate this into your ESXi kickstart, you can easily do so based on the number of VMkernel interfaces you will be creating during the installation. You can add the following into your %post section which uses a here document to overwrite the existing hostsvc.xml with the expected VMkernel interfaces that should have the management traffic type enabled.

HOSTSVC_FILE=/etc/vmware/hostd/hostsvc.xml

cat > ${HOSTSVC_FILE} << __CREATE_HOST_SVC__

  
    vmk0
    vmk1
    vmk2
  
  normal
  
    on
    on
    on
  

__CREATE_HOST_SVC__

This is a cleaner alternative than using python and connecting to the vSphere API locally on an ESXi host which is described in my blog article Automating ESXi 4.1 Kickstart Tips & Tricks Tip #7