Please note that there is huge improvement in terms of perfs if you
choose to cherry-pick the libgfapi driver which has recently been
implemented in Nova [1].
That would assume you use Cinder bootable volumes instead of classical
QCOW2 instances, but the improvement is worth it.
-Sylvain
Le 20/08/2013 09:29, Marco CONSONNI a écrit :
Hello Guilherme and all,
I was able to deploy live migration with gluster: I originally tried
NFS like you did but I found problems.
On the contrary, Gluster works perfectly and it's quite easy to instal
and configure.
This is what you need to do for a basic installation assuming that you
have a node, working as a gluster server, with 2 disks and a set of
compute nodes, working as gluster clients, that use the gluster shared
directory for saving the running images.
-- On the gluster server --
1) Prepare the volumes
Assuming that you have two disks (/dev/sdb and /dev/sdc), create a
primary partition on both of them using fdisk command.
Format the volumes with command: sudo mkfs.xfs -i size=512 /dev/sdb1
and sudo mkfs.xfs -i size=512 /dev/sdc1
Prepare two directories for mounting the two volumes: sudo mkdir -p
/export/brick1 and sudo mkdir -p /export/brick2
Configure /etc/fstab for mounting the volumes by adding the following
lines:
/dev/sdb1/export/brick1xfsdefaults02
/dev/sdc1/export/brick2xfsdefaults02
Mount the two volumes with command sudo mount --a
2) install and configure gluster server
sudo apt-get install glusterfs-server
sudo gluster volume create openstack stripe 2 <IP address of the
server>:/export/brick1 <IP address of the server>:/export/brick2
sudo gluster volume start openstack
-- On the gluster clients / compute nodes --
1) Install the gluster client with command sudo apt-get install
glusterfs-client
2) in the /etc/fstab, configure a gluster filesystem with name
/var/lib/nova/instances by adding the following line:
<IP address of gluster server>:/openstack /var/lib/nova/instances
glusterfs defaults,_netdev 0 0
Note that if you have already have a /var/lib/nova/instances directory
on the compute node, this fstab configuration simply 'hides' that but
the contents are still there.
This configuration is needed for forcing compute node to store
instances onto the gluster shared directory.
Hope it helps,
Marco.
2013/8/7 Guilherme Russi <luisguilherme...@gmail.com
<mailto:luisguilherme...@gmail.com>>
Hello guys,
I've been trying to deploy live migration to my cloud using NFS
but without success, I'd like to know if somebody has tried live
migration with Gluster Storage, does it work? Any problem when
installing it? Following the documentation from its website is
easy to install?
The only thing that is left to my cloud works 100% is the live
migration.
Thank you all.
Guilherme.
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