[Openstack] Diskless Compute Nodes?

Mark Chaney mail at lists.macscr.com
Fri Aug 2 12:27:49 UTC 2013

When you say instances, are you actually talking about the VM's? Of course they will be booted from volumes in ceph, but I am talking about the Compute Nodes, the actual hypervisors. I of course would have to use pxe for that. No idea if there was a way for me to use ceph that way though. Yes, puppet is a great tool for automating tasks, etc, but that obviously takes a lot of time to setup manually and I honestly have very little puppet experience so far. Its something I need to keep in mind though. Thanks for the response.


On Aug 2, 2013, at 7:21 AM, Maciej Gałkiewicz <macias at shellycloud.com> wrote:

> On 2 August 2013 13:36, Mark Chaney <mail at lists.macscr.com> wrote:
> So I am planning on setting up my first openstack cloud a little like so where my Compute nodes will be diskless:
> http://content.screencast.com/users/MACscr/folders/Snagit/media/539491bf-c5ed-49e8-88a5-d812f954176e/2013-08-02_04-54-29.png
> I will be using Ceph for Object Storage and also RBD for the VM storage. Since the Compute nodes will be diskless, I will have to boot them through pxe and load the OS into memory and then also when guests are booted, they will have to be done through their Volumes since Ephemeral storage will not be available.
> Since I unfortunately seem to be going against the standard practice, I am wondering if anyone has any suggestions on any deployment or management tools that I might be able to use to better create my openstack mini cloud and also manage it (adding new nodes, storage, etc). Unfortunately it looks like tools like Fuel for Openstack or the Rackspace Private Cloud toolset not only do not support diskless Compute nodes, but also do not even support Ceph. I know I could build everything from scratch, but thats not only going to be time consuming, but a pain to maintain in the future. The TripleO project seems to have a lot of promise, but unfortunately appears to be a bit to early in its dev cycle and also at least at its current state, to be a bit over my head.
> Have you considered booting instances from volumes stored in ceph? In such case you dont have to use pxe and keep os in memory. I suggest using chef/puppet whatever is suitable for you for deployment.
> regards
> -- 
> Maciej Gałkiewicz
> Shelly Cloud Sp. z o. o., Sysadmin
> http://shellycloud.com/, macias at shellycloud.com
> KRS: 0000440358 REGON: 101504426

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