Open Stack

Hi,
yes, the disks are local storage on each compute nodes
But I did configure LVM  on each compute node, and did configure this according to the Juno Install guide:

"The service provisions logical volumes on this device
using the LVM driver and provides them to instances via iSCSI transport."

And volume groups are configured on each compute node:
vgcreate cinder-volumes /dev/sdX

So, I guess I'm using a shared storeage  ( iscsi ) ?
Are you referring to LVM configuration and thus a shared storage,  iscsi ?

Best regards
Yngvi


From: Xabier Elkano [mailto:xelkano at hostinet.com]
Sent: 11. júní 2015 12:13
To: Yngvi Páll Þorfinnsson; openstack at lists.openstack.org
Subject: Re: [Openstack] live migration of instances


Hi,

do you have shared storage for your instances? If your instances disks are in a shared storage like iscsi or CEPH you can do live migrations without problems, otherwise, if your instances disks are in the compute nodes local storage ( /var/lib/nova/instances), you may need to put this directory in a NFS share to be able to do live migrations.

BR,
Xabier

El 11/06/15 a las 11:56, Yngvi Páll Þorfinnsson escribió:
Hi

I have installed and configured OpenStack(Juno) environment on Ubuntu(14.04).
We have currently 1 controller node, 3 network nodes and 4 compute nodes as well as 4 swift nodes.
I'm using OpenStack Networking (neutron).

I was thinking of doing a "live migration" of several instances, if I need to do a OS upgrade on  a compute node.
For the task of configuring "live magration" I've been reading this document:

OpenStack Cloud Administrator Guide
current (2015-05-21)
Copyright © 2013-2015 OpenStack Foundation Some rights reserved.

I can quickly see it's necessary to add this line to the nova.conf file ( on computer nodes):

live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,
VIR_MIGRATE_LIVE, VIR_MIGRATE_TUNNELLED

Also, it seems I need to configure a NFS mount og the dir
/var/lib/nova/instances
and thus configures file system access between all compute nodes.

My question is:
Is this the only way to configure a Live migration of instances in Openstack ?  i.e. configure a nfs mount of directories?

Best regards
Yngvi













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