Specify type of host for virtual machines

[Sam Bird]

Hi there:

I have an experiment profile that relies on multiple hosts, and to reduce the number of physical hosts I have been running these in virtual machines. These XenVMs are running on the same physical PC.

I am trying to specify the hardware type in my geni-lib script. However, if I were to write

node_0 = request.XenVM('node-0')

node_0.hardware_type = 'c6620'

node_1 = request.XenVM('node-1')

node_1.hardware_type = 'c6620'

Both of these nodes would be created on the desired hardware type, but on different physical PCs. Is there a way to group these two nodes so that the VMs are created on the same physical PC of a given type? If it is relevant, all nodes are connected by a Link.

Thanks

Sam

[Leigh Stoller]

> On Dec 23, 2025, at 1:53 PM, Sam Bird <sam....@ou.edu> wrote:
>
> Both of these nodes would be created on the desired hardware type, but on different physical PCs. Is there a way to group these two nodes so that the VMs are created on the same physical PC of a given type? If it is relevant, all nodes are connected by a Link.

Hi. Take a look at this example profile:

https://www.cloudlab.us/show-profile.php?uuid=865973b6-d077-11ed-b28b-e4434b2381fc

Leigh

[Bird, Sam]

Hi Leigh, that worked. Thanks!

Sam

From: cloudla...@googlegroups.com <cloudla...@googlegroups.com> on behalf of Leigh Stoller <lbst...@gmail.com>
Date: Tuesday, 23 December 2025 at 16:50
To: cloudlab-users <cloudla...@googlegroups.com>
Subject: Re: [cloudlab-users] Specify type of host for virtual machines

External Email

 

> On Dec 23, 2025, at 1:53 PM, Sam Bird <sam....@ou.edu> wrote:
> 
> Both of these nodes would be created on the desired hardware type, but on different physical PCs. Is there a way to group these two nodes so that the VMs are created on the same physical PC of a given type? If it is relevant, all nodes are connected by a Link.

Hi. Take a look at this example profile:

https://urldefense.com/v3/__https://www.cloudlab.us/show-profile.php?uuid=865973b6-d077-11ed-b28b-e4434b2381fc__;!!GNU8KkXDZlD12Q!87tTCIj5j399I_FdZUIAVjsyHYESXgaojAQjkPyfcmfghi2JIgLietumUYM3QunpGbL1U8uRYjFPoGre$[cloudlab[.]us]

Leigh

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