libvirt users - Apr 2016 - Re: Managing VMs across multiple physical hosts

Hello List,

We’re currently managing VMs across approximately 26 physical hosts.  We tend to
migrate VMs around a lot to do things like spread load and keep VMs running when
physical hosts are in need of package updates.

Suffice it to say sometimes finding out which physical host a VM is currently
running on can be a pain.

Anyone know of an open source tool that will give me a snapshot of what’s
running where across a list of physical hosts?  Doesn’t have to be anything
fancy.  A command-line utility will do.

Best,
Daniel

Hi Daniel,

mist.io is an open source project and a Saas for managing clouds, servers
and KVM hypervisors. The open source version can be found on
https://github.com/mistio/mist.io

Feel free to open issues on what is missing from an ideal KVM management
solution.

Regards,
Markos



On Mon, Apr 25, 2016 at 2:01 AM, Daniel Corbe <dcorbe@hammerfiber.com>
wrote:
> Hello List,
>
> We’re currently managing VMs across approximately 26 physical hosts.  We
> tend to migrate VMs around a lot to do things like spread load and keep VMs
> running when physical hosts are in need of package updates.
>
> Suffice it to say sometimes finding out which physical host a VM is
> currently running on can be a pain.
>
> Anyone know of an open source tool that will give me a snapshot of what’s
> running where across a list of physical hosts?  Doesn’t have to be anything
> fancy.  A command-line utility will do.
>
> Best,
> Daniel
>
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users

Looks like an interesting project for a number of reasons.   Do you guys have a
mailing list though?  Cos I’ve run into a couple of installation issues that I
need assistance resolving.

-Daniel
> On Apr 25, 2016, at 8:17 AM, Markos Gogoulos <mgogoulos@mist.io>
wrote:
> 
> Hi Daniel, 
> 
> mist.io is an open source project and a Saas for managing clouds, servers
and KVM hypervisors. The open source version can be found on
https://github.com/mistio/mist.io
> 
> Feel free to open issues on what is missing from an ideal KVM management
solution.
> 
> Regards,
> Markos
> 
> 
> 
> On Mon, Apr 25, 2016 at 2:01 AM, Daniel Corbe
<dcorbe@hammerfiber.com> wrote:
> Hello List,
> 
> We’re currently managing VMs across approximately 26 physical hosts.  We
tend to migrate VMs around a lot to do things like spread load and keep VMs
running when physical hosts are in need of package updates.
> 
> Suffice it to say sometimes finding out which physical host a VM is
currently running on can be a pain.
> 
> Anyone know of an open source tool that will give me a snapshot of what’s
running where across a list of physical hosts?  Doesn’t have to be anything
fancy.  A command-line utility will do.
> 
> Best,
> Daniel
> 
> 
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
>

the libvirt command to see what is running is simply 'virsh list'

so if you have a config tool system like puppet/chef/ansible (or even 
remote ssh commands) you can simply send that command to each node.

We use ansible, so a simple on liner would be:

ansible all -i virt_list.ini -m command -a 'virsh list' --sudo

where the file virt_list.ini is the list of VM hosts.

That would output a listing that looks like this

host-b2 | SUCCESS | rc=0 >>
  Id    Name                           State
----------------------------------------------------
  4     vm34                      running
  5     vm42                      running

host-b3 | SUCCESS | rc=0 >>
  Id    Name                           State
----------------------------------------------------
  3     vm2                          running
  5     vm12                         running
  7     vm33                    running

etc.

so you would quickly see whats running where. With a little 
grep/awk/perl goodness, it would be trivial to pipe that output into a 
DB table that could searched and constantly updated.

The more hardcore ansible guys could make some sort of playbook that 
would do the above, but the above shows you the way.

-bill




On 4/24/2016 4:01 PM, Daniel Corbe wrote:
> Hello List,
>
> We’re currently managing VMs across approximately 26 physical hosts.  We
tend to migrate VMs around a lot to do things like spread load and keep VMs
running when physical hosts are in need of package updates.
>
> Suffice it to say sometimes finding out which physical host a VM is
currently running on can be a pain.
>
> Anyone know of an open source tool that will give me a snapshot of what’s
running where across a list of physical hosts?  Doesn’t have to be anything
fancy.  A command-line utility will do.
>
> Best,
> Daniel
>
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users