[Openstack] Diskless Compute Nodes?

Maciej Gałkiewicz macias at shellycloud.com
Fri Aug 2 12:21:40 UTC 2013

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.

Maciej Gałkiewicz
Shelly Cloud Sp. z o. o., Sysadmin
http://shellycloud.com/, macias at shellycloud.com
KRS: 0000440358 REGON: 101504426
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