[pve-devel] proxmox 3->4 cluster upgrade : corosync2 wheezy transition package ?

[Daniel Hunsaker]

Cross-cluster migration could actually be really handy to have as a full
feature.  Then you could, for example, have a development/testing cluster
(possibly a single node) in your dev lab, and a production cluster in your
hosting center(s), and when a given VM moves from dev/test into production,
you simply migrate it to the production cluster.  It would also be handy
for situations like this one, obviously, where you're migrating between
otherwise-incompatible environments.

It would, by its nature, only support offline migration, so there would be
no consideration for HA or any of the numerous checks involved in live
migrations.  The most complexity I can see is in specifying when both
clusters (source and destination) have access to the storage(s) used to
hold the VM/CT images/directories.  You'd have to be able to pass something
like `--map-storage=<source-name>:<destination-name>` for every storage
that is accessible from both clusters.  You'd also have to specify a target
storage for anything that isn't mapped on both clusters, so the migration
could rsync (or whatever) anything that isn't on a shared storage.  But the
rest should be fairly straightforward, as far as I can tell.  So long as
the source can ssh to the destination, it should be a fairly smooth process.

On Sat, Oct 3, 2015, 07:34 Alexandre DERUMIER <aderumier at odiso.com> wrote:

> >>You need to update at least 3 packages for that:
> >>
> >>- libqb
> >>- corosync
> >>- pve-cluster
> >>
> >>and that update will have bad side effects for all other cluster related
> >>packages
> >>
> >>- redhat-cluster-pve
> >>- openais
> >>- clvmd
> >>- anything else?
>
> Need to disable HA before upgrade.
>
> For clvmd, I really don't known what is the impact, as I don't use it.
>
> >>
> >>This looks really complex to me?
>
>
> Yes, I don't say it's easy, but the only other way currently, if we want
> no interruption (for qemu of course),
> and be able to do live migration is :
>
> 1) keep a node empty without any vm
> 2) upgrade all hosts in the cluster to jessie  + proxmox 4.0 (in place,
> with vms running during the upgrade)
> 3) reboot the empty node
> 4) migrate all vm  from 1 node to the empty node
> 5) reboot the new empty node
>   ...
>   ..
>
>
>
> Another way, could be to build a new cluster,
> and be allowed to do live migration between clusters.
> (Need a little work, but technically it's possible).
> Only with special command line, not exposed in gui.
>
>
>
>
>
> ----- Mail original -----
> De: "dietmar" <dietmar at proxmox.com>
> À: "aderumier" <aderumier at odiso.com>, "pve-devel" <
> pve-devel at pve.proxmox.com>
> Envoyé: Samedi 3 Octobre 2015 10:05:49
> Objet: Re: [pve-devel] proxmox 3->4 cluster upgrade : corosync2 wheezy
> transition package ?
>
> > On October 3, 2015 at 9:42 AM Dietmar Maurer <dietmar at proxmox.com>
> wrote:
> >
> >
> > > > I wonder if it could be great (ad possible? )to make a corosync2
> > > > transition
> > > > package for wheezy.
> > > >
> > > > Like this we could mix (proxmox3-wheezy-corosync2 and
> > > > proxmox4-jessie-corosync2),
> > > > and do live migration as usual.
> > > >
> > > >
> > > > What do you think about it ?
> > >
> > > How should that work? corosync2 is not compatible with corosync 1.4, so
> > > what is the idea?
> >
> > Oh, you want to backport corosync2 to wheezy? Need to think about that.
>
> You need to update at least 3 packages for that:
>
> - libqb
> - corosync
> - pve-cluster
>
> and that update will have bad side effects for all other cluster related
> packages
>
> - redhat-cluster-pve
> - openais
> - clvmd
> - anything else?
>
> This looks really complex to me?
>
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>
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