Open Stack

Hi,

If my understanding is correct :


1)      To make NFS available for Cinder, I may follow this article :

https://access.redhat.com/articles/1323213



2)      If I wish only use NFS for nova storage, is it enough to modify nova.conf line :

                instances_path=$state_path/instances

                on both nodes (identical mount point) by changing for this kind of value :

                instances_path=/nfs_mount_path/instances

                Then boot from image (without "creating volume") will instantiate an instance
                 I may migrate between my two compute nodes .

Am I wrong ?

Thx for help.

Regards,

J.P.

From: Tzach Shefi [mailto:tshefi at redhat.com]
Sent: jeudi 16 juin 2016 14:39
To: Jean-Pierre Ribeauville <jpribeauville at axway.com>
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] Launching an instance by using NFS shared volume

Hey Jean,
Sorry I'm a bit late,  I'll try to guide/help you in the right direction.
First of all, let your peers know which which version of Openstack you're using,  Juno(6) Kilo(7) Liberty(8) Mitaka(9)?

"I just add NFS as backend." -> cool nice job, but by this what do you mean  NFS backend for what? For Cinder Glance or Nova or for all of them?
You want the instance to live migrate to another compute node right?
For this all you need shared Nova storage (if I recall you can do without but it's easier with), no need to use Cinder volume for the instance, unless you want to do so.
Check this link for migration stuff, check your version and which hypervisor you use, each has it's own settings and special needs.
http://docs.openstack.org/admin-guide/compute-configuring-migrations.html
I didn't get this part  ( i.e. I boot from an .iso image )
You know that the image must be either a liveCD iso which is a bootable OS, or a qcow2 image of a preinstalled OS.

From your command I take if you want to boot an instance from an image which will create a Cinder volume.
nova boot --image CentOS-7-ISO --block-device source=blank,dest=volume,size=10,shutdown=preserve --nic net-id=73d765a3-edca-4ac4-822d-1d0f30cc959b --flavor 2 CentOS-7-Bootable-Image

If your Cinder (or Nova in case you don't want/have to use a Cinder volume) is configured to use NFS your done.
You don't have to tell Nova boot command to use NFS  it will automatically use Cinder (or Nova) backend storage.
Say you have Nova running over NFS, if you nova boot an instance, it's disk will be created on Nova's backend which is NFS.
Same for Cinder if the backend is configured for NFS, boot an instance create a volume, the volume will be created on the NFS backend.

Hope I helped a bit.
If you have more questions fire away.
Tzach








On Fri, Jun 10, 2016 at 10:38 AM, Jean-Pierre Ribeauville <jpribeauville at axway.com<mailto:jpribeauville at axway.com>> wrote:
Hi,

I just add NFS as backend .

Now, I want to launch an instance so it will be bootable from a nfs shared device .( and then ( it’s my hope) may migrate to another compute node)
( i.e. I boot from an .iso image )


I don’t find how , in the following nova boot command, to specify that I want that a “nfs” volume will be created to hold this instance  :


nova boot --image CentOS-7-ISO --block-device source=blank,dest=volume,size=10,shutdown=preserve --nic net-id=73d765a3-edca-4ac4-822d-1d0f30cc959b --flavor 2 CentOS-7-Bootable-Image


Thx for help

Regards,

Jean-Pierre RIBEAUVILLE

+33 1 4717 2049<tel:%2B33%201%204717%202049>

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--
Tzach Shefi
Quality Engineer, Redhat OSP
+972-54-4701080<callto:+972-52-4534729>
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