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Re: [Xen-users] Xen 4.2.2 /etc/init.d/xendomains save and restore of domains does not work

  • To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
  • From: Ian Murray <murrayie@xxxxxxxxxxx>
  • Date: Tue, 2 Jul 2013 11:20:40 +0100 (BST)
  • Cc: xen-users <xen-users@xxxxxxxxxxxxx>, "greve-ml@xxxxxxxxxx" <greve-ml@xxxxxxxxxx>, "andreas.greve@xxxxxxxxxx" <andreas.greve@xxxxxxxxxx>
  • Delivery-date: Tue, 02 Jul 2013 10:21:33 +0000
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----- Original Message -----
> From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
> To: Ian Murray <murrayie@xxxxxxxxxxx>
> Cc: "greve-ml@xxxxxxxxxx" <greve-ml@xxxxxxxxxx>; xen-users 
> <xen-users@xxxxxxxxxxxxx>; "andreas.greve@xxxxxxxxxx" 
> <andreas.greve@xxxxxxxxxx>
> Sent: Tuesday, 2 July 2013, 10:44
> Subject: Re: [Xen-users] Xen 4.2.2 /etc/init.d/xendomains save and restore
 of domains does not work
> On Tue, 2013-07-02 at 10:40 +0100, Ian Murray wrote:
>>  > Even better would be to just do away with this madness of parsing JSON
>>  > or SXP in shell (keeping it only for xm compatibility) and add proper 
> xl
>>  > commands to save and restore all domains to/from a given directory.
>>  Xendomains does quite a bit of high level stuff.... it's a
>>  "convenience" script IMHO which not only deals with suspending 
> and
>>  restoring but also starting the auto domains and dealing with things
>>  that appear in both (i.e. the skipping of auto start stuff that has
>>  just been restored). From a design point of view, is it the right
>>  thing to do to move all that logic in xl? ... or keep it in a seperate
>>  tool (but definitely re-written.)
> Probably one to RFC on the devel list before committing lots of code
> too, but I think its the sort of thing we could accept.

I think a discussion about what xendomains is supposed to do (especially 
dealing with the more obscure stuff like zombies and system requests) would be 
a decent place to start I think that would shape the technical response.

> Doing it in xl would be convenient, but a separate tool might also be
> workable. The main point is "don't parse JSON in shell"!

I think everyone would agree with that.

> You could also consider implementing a more shell friendly output mode
> though, which just produces FOO-separated lines of text with the name
> and domid in them...

I think state would be needed as well.

> Ian.

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