Xen users - Mar 2012 - domU starting in a managed sequence

Hello,

is it possible to start domU''s in a managed sequence, without a new 
installation.

My Problem I have to start my ldap server before krb5 and so on.

Thanks for a answer

-- 
mit freundlichen Grüßen / best Regards,

 Günther J. Niederwimmer

Günther J. Niederwimmer wrote:
>is it possible to start domU''s in a managed sequence, without a new
>installation.
>
>My Problem I have to start my ldap server before krb5 and so on.
I''m not aware of anything, and I have similar 
problems - need to have DNS running before other 
stuff starts, DB backends running before 
dependent services start, etc.

From previous threads, the suggestion have been 
along the lines of what you''d need to do if they 
were physical servers. The suggestion I recall 
was that you insert scripts in your startup that 
will wait until required external services have 
started before exiting and allowing the boot 
process to continue.

In my case, I''m considering building a hosts file 
with all the key entries I need, and distributing 
that to most of my machines. That would deal with 
most of my problems. Just to remind me of this 
to-do, we had a power cut last week and so had to 
do a "cold start" with all the fun that entails :(

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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On 03/01/2012 09:29 AM, Simon Hobson wrote:
> Günther J. Niederwimmer wrote:
> 
>> is it possible to start domU''s in a managed sequence, without
a new
>> installation.
>>
>> My Problem I have to start my ldap server before krb5 and so on.
> 
> I''m not aware of anything, and I have similar problems - need to
have
> DNS running before other stuff starts, DB backends running before
> dependent services start, etc.
You haven''t said how you are managing your domU''s. If you are
using the
bog-standard xm commands, you just need to rename the symlinks in
/etc/xen/auto to get the order you want, eg. 01-ldap.cfg 02-krb.cfg ...
I just wish the shutdown is similarly flexible, but it would just take a
bit of modification to the shutdown script to achieve it.

If you are using pacemaker to manage stuff, I think I saw some sort of
dependancy mechanism there. I have no idea what libvirt has available.
- -- 
Tony Lill, OCT,                    Tony.Lill@AJLC.Waterloo.ON.CA
President, A. J. Lill Consultants                 (519) 650 0660
539 Grand Valley Dr., Cambridge, Ont. N3H 2S2     (519) 241 2461
- --------------- http://www.ajlc.waterloo.on.ca/ ----------------


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