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Thanks Sergey,

Will look into this, but still have the same question, would introducing containers increase my footprint per fake compute service? I can run multiple compute service in same hosts without containers. Containers give you a nice isolation and another way to try a more realistic scenario, but my initial goal now is to be able to simulate many fake compute node scenario with as little resources as possible. 

Regards,
David Peraza 

-----Original Message-----
From: Sergey Skripnick [mailto:sskripnick at mirantis.com] 
Sent: Monday, March 03, 2014 3:18 PM
To: openstack-dev at lists.openstack.org
Subject: Re: [openstack-dev] [nova] Simulating many fake nova compute nodes for scheduler testing

David Peraza <david_peraza at persistentsys.com> писал(а) в своём письме Mon,  
03 Mar 2014 21:27:01 +0200:

>
> Using compute inside LXC, I created 100 computes per physical host. Here  
> is what I did, it's very simple:
>  -  Creating a LXC with logical volume
>   - Installing a fake nova-compute inside the LXC
>   - Make a booting script that modifies its nova.conf to use its IP  
> address & starts nova-compute
>   - Using the LXC above as the master, clone as many compute as you like!
>
> (Note that while cloning the LXC, the nova.conf is copied with the  
> former's IP address, that's why we need the booting script.)
>


Also btrfs can be used to reduce disk space usage. Scenario is looks like  
this:

* create btrfs filesystem on /var/lib/lxc
* create first container with btrfs backingstore (lxc-create -B btrfs ...)
* setup devstack with fakevirt
* stop container, and make N snapshotted clones (lxc-clone --snapshot ...)
* start containers and run booting script (here script used by Rally [0])

If you do not want to do all this manually, there is  
MultihostEngine/LxcEngine
coming soon in Rally [1]

[0]  
https://review.openstack.org/#/c/56222/25/rally/deploy/engines/lxc/start.sh
[1] https://wiki.openstack.org/wiki/Rally

-- 
Regards,
Sergey Skripnick

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