List DHCP server list in the vSphere environment

[Neorullz]

Hello

I need to retrieve all the DHCP servers that cater to the DHCP-enabled vSphere VMs in the datacenter. How do I do that using PowerShell? I assume this information resides on the VM Hosts?

I can connect to the vCenter server,  retrieve VMs and the corresponding VMHosts. Just need to collect DHCP inventory.

Thanks

[LucD]

That information does, afaik, not sit on the ESXi nodes.
You will have to query the Guest OS on the VMs to retrieve that information.
If your VMs have the VMware Tools installed, you can use the Invoke-VMScript cmdlet to run code/commands inside the Guest OS.
What code to use depends on the type of the Guest OS.

[Neorullz]

Thank you. I realised after posting my question that DHCP is part of general IT infrastructure so vSphere wouldn't know about it natively (of course the server hosting DHCP could as well be on of the VMs).

But how would I check using PowerShell if DHCP is enabled on the VM?

[LucD]

I repeat from my previous reply "What code to use depends on the type of the Guest OS."

[Neorullz]

oops sorry, we have both Windows servers and a variety of Linux (including the prominent distros) in the estate

[LucD]

In a Windows OS you can use the command ipconfig/all to retrieve DHCP information.

On most Linux distributions you could do something like grep dhcp-server-identifier /var/lib/dhcp/dhclient.leases

[Neorullz]

ah.. I was looking at the vCenter level inventory as opposed to burrowing into each VMs to run ipconfig.

I thought there was a DHCPEnabled setting available somewhere in the vCenter VM-Network inventory but can't seem to get hold of it.

[LucD]

If you have the VMware Tools installed, you can check if the info is available in

$vm = Get-VM -Name MyVM
$vm.ExtensionData.Guest.IPStack.DhcpConfig

[Neorullz]

I do not think we have the VMWare tools installed so I need to look into the IPConfig route.

Thanks for your help as always.

[LucD]

If you don't have the VMware Tools installed, you will not be able to use the Invoke-VMScript cmdlet either I'm afraid

[Neorullz]

Thanks. Another team has managed to obtain this info using their infrastructure tooling.

[ganapa2000]

LucD,

I tried the as mentioned. but DhcpConfig shows blank.

VMware Tools are running on the server.

 

 

[LucD]

Did you also check under $vm.ExtensionData.Guest.Net.IpConfig?

[ganapa2000]

LucD,

Below is the requested output

 

 

[LucD]

Then it looks as if the VMware Tools were not able to extract that info from the Guest OS.
The IpStack documentation does mention "Guest information about IP networking stack, if known".

You will have to query inside the Guest OS with a Guest OS native command (through for example Invoke-VMScript)

[ganapa2000]

Sure LucD, Thanks for the update.