migrate vps from xm to xl toolstack

migrate vps from xm to xl toolstack

[Vasiliy Tolstov]

Hello, xen  team.
As i understand migrate from xm to xl is not possible.
But is that possible to migrate vps by hands? For example on xm node i
do xm save and on xl node doins xl restore... ?

--
Vasiliy Tolstov,
Clodo.ru
e-mail: v.tolstov@selfip.ru
jabber: vase@selfip.ru

Re: migrate vps from xm to xl toolstack

[George Dunlap]

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On Fri, Dec 7, 2012 at 5:46 AM, Vasiliy Tolstov <v.tolstov@selfip.ru> wrote:

> Hello, xen  team.
> As i understand migrate from xm to xl is not possible.
> But is that possible to migrate vps by hands? For example on xm node i
> do xm save and on xl node doins xl restore... ?
>

I take it you're looking to do a "rolling upgrade" of a set of servers?  I
don't think I had thought of that before. :-)

A couple of points though:
* The save file is actually not made by xm or xl, but by the lower-level xc
libraries which are shared by both.  So although I don't think we've tested
saving with xm and restoring with xl, I have every reason to think it will
work just fine.
* Switching from xm to xl and back should just be a matter of starting or
stopping xend.  You could try starting xend on the "upgraded" side
temporarily, just long enough to do the migration, and then shut it down
again.  There are certain commands which xl can't safely do if xend is
running, but xl will automatically look for xend and refuse to execute if
that's the case.  Then you can just shut xend down, and xl will work again.

Obviously you should test this out on some non-critical VMs before doing
them on production VMs. :-)

 -George


> --
> Vasiliy Tolstov,
> Clodo.ru
> e-mail: v.tolstov@selfip.ru
> jabber: vase@selfip.ru
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
>

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Re: migrate vps from xm to xl toolstack

[Ian Campbell]

On Mon, 2012-12-10 at 12:37 +0000, George Dunlap wrote:
> On Fri, Dec 7, 2012 at 5:46 AM, Vasiliy Tolstov <v.tolstov@selfip.ru>
> wrote:
>         Hello, xen  team.
>         As i understand migrate from xm to xl is not possible.
>         But is that possible to migrate vps by hands? For example on
>         xm node i
>         do xm save and on xl node doins xl restore... ?
> 
> I take it you're looking to do a "rolling upgrade" of a set of
> servers?  I don't think I had thought of that before. :-)
> 
> A couple of points though:
> * The save file is actually not made by xm or xl, but by the
> lower-level xc libraries which are shared by both.  So although I
> don't think we've tested saving with xm and restoring with xl, I have
> every reason to think it will work just fine.

Ian J tested this as part of the 4.2.0 release, it could be made to work
with a couple of simple tricks. Details ought to be in the list
archives.

Ian.