Re: [Xen-devel] xend deprecation

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Sep 4, 2013 at 3:04 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Wed, Sep 04, 2013 at 08:29:07AM +0100, Ian Campbell wrote:
>> On Tue, 2013-09-03 at 23:06 -0700, Matt Wilson wrote:
>> > On Tue, Sep 03, 2013 at 09:03:46AM +0100, Ian Campbell wrote:
>> > > On Mon, 2013-09-02 at 13:32 -0700, Matt Wilson wrote:
>> > > > Live migration between a system running xend to a system that doesn't
>> > > > support xend would be a nice-to-have. That probably means some support
>> > > > for SXP parsing either in libxl or in some compatibility tool.
>> > >
>> > > This already works by using xl on the source side, e.g. a guest started
>> > > with xend on 4.1 can be migrated with 4.1's xl to 4.2.
>> > >
>> > > http://lists.xen.org/archives/html/xen-devel/2012-08/msg02191.html
>> >
>> > xl doesn't run everywhere that we need it to.
>>
>> Details please, or we aren't going to be able to even think about how to
>> solve this for you.
>>
>> BTW You can also do a xend migration to e.g. 4.2 (using the xend whichis
>> in 4.2) and the use 4.2's xl to do a localhost migrate or a second
>> remote migrate to another 4.2 system.
>>
>> xend's deprecation has been on the cards, and widely known, for several
>> releases now. It is time to quit stalling and start moving. I intend to
>> post a patch deleting it as soon as 4.4 is out the door.
>
> And I think I might have to lobby hard against removing it.
>
> There are issues that are stopping us from using it:
>
>  - No status in xl list -l when only dom0 is present.
>  - 'xl list -l' says 'Domain name must be specified' even though the '-l'
>    is for 'Output all VM details'
>  - xl list -l for PV guest has bug: it’s not formated S-expression text.
>  - No console in xl list -l, so can't get  tty console port.
>  - xl uses SSH for migration. We need SSL daemon or socat like xend has.
>
> Those should be fixed at some point :-) Problem is that other things
> keep on popping up on the radar and hence we end up using xend.

Uum, when were you going to report these?  A lot of us were under the
impression that xl behaved sufficiently like xend for anyone who
cared.

Maybe we should make an announcement (on blog, xen-users, xen-devel,
and xen-announce) that there has been a proposal to make 4.4 the last
release with xend, and so it's important to report all bugs / missing
features of xl so we can get them fixed by the 4.4 release?

 -George

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