[one-users] econe-run-instances idempotent?

[Daniel Molina]

On 15 October 2014 18:18, Parag Mhashilkar <parag at fnal.gov> wrote:

> Hi Daniel,
>
> Let me rephrase what we meant.
>
> As Steve mentioned in one of his emails, we use HTCondor to launch VMs.
> There is always a possibility that something can go wrong after a
> run-instance command is issued and before the ec2 server gets back to you
> with a valid instance id or an error message. Note that in this case the
> server may serve the request, but there is no way for the client to know
> the exact instance name that resulted from the request. Life is much easier
> if the client crashes after it gets back the instance name.
>
> One way for the client to know the exact status of the request even after
> a crash (and before it gets the instance id) is to assign a unique
> identifier of its own like a tag name or something. This way client will
> never lose track of the request and result in the leaked VMs.
>
> The way HTCondor is implementing this is by creating a new key pair and
> giving it a unique name and tracking the requests based on the key pair.
> But then we are hit by other limit ~300 that we observed.
>
> Ideally, we would like to use the --keypair option and use the existing
> pre registered key. But than we cannot track the results of the
> create-instance in case something goes wrong before the instance id is
> issued.
>

And what about including a tag in the UserData instead of using the unique
keypar?



>
> Thanks & Regards
> +==========================================================
> | Parag Mhashilkar
> | Fermi National Accelerator Laboratory, MS 120
> | Wilson & Kirk Road, Batavia, IL - 60510
> |----------------------------------------------------------
> | Phone: 1 (630) 840-6530 Fax: 1 (630) 840-3109
> |----------------------------------------------------------
> | Wilson Hall, 806E (Nov 8, 2012 - To date)
> | Wilson Hall, 867E (Nov 17, 2010 - Nov 7, 2012)
> | Wilson Hall, 863E (Apr 24, 2007 - Nov 16, 2010)
> | Wilson Hall, 856E (Mar 21, 2005 - Apr 23, 2007)
> +==========================================================
>
> On Oct 15, 2014, at 11:02 AM, Daniel Molina wrote:
>
> >
> >
> > On 15 October 2014 17:57, Steven Timm <timm at fnal.gov> wrote:
> > If you call the same CreateInstances command more than once
> > is there any way that it will create the instance twice or not.
> >
> > If you call the command twice it will create 2 instances. You can also
> provide de MaxCount param in the CreateInstance command to create more than
> one instance at once.
> >
> >
> > Steve Timm
> >
> >
> >
> >
> > On Wed, 15 Oct 2014, Daniel Molina wrote:
> >
> > Hi,
> > What do you mean with "idempotent"? As long as the client implements the
> ec2 API, it should work
> > Cheers
> >
> > On 13 October 2014 20:33, Parag Mhashilkar <parag at fnal.gov> wrote:
> >       Hi,
> >
> >       We are using HTCondor to launch VMs in OpenNebula using ec2
> interface and would like to know if the
> >       submit calls are idempotent.
> >
> >       Thanks & Regards
> >       +==========================================================
> >       | Parag Mhashilkar
> >       | Fermi National Accelerator Laboratory, MS 120
> >       | Wilson & Kirk Road, Batavia, IL - 60510
> >       |----------------------------------------------------------
> >       | Phone: 1 (630) 840-6530 Fax: 1 (630) 840-3109
> >       |----------------------------------------------------------
> >       | Wilson Hall, 806E (Nov 8, 2012 - To date)
> >       | Wilson Hall, 867E (Nov 17, 2010 - Nov 7, 2012)
> >       | Wilson Hall, 863E (Apr 24, 2007 - Nov 16, 2010)
> >       | Wilson Hall, 856E (Mar 21, 2005 - Apr 23, 2007)
> >       +==========================================================
> >
> >
> >       _______________________________________________
> >       Users mailing list
> >       Users at lists.opennebula.org
> >       http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> >
> >
> >
> >
> > --
> > --
> > Daniel Molina
> > Project Engineer
> > OpenNebula - Flexible Enterprise Cloud Made Simple
> > www.OpenNebula.org | dmolina at opennebula.org | @OpenNebula
> >
> >
> >
> > ------------------------------------------------------------------
> > Steven C. Timm, Ph.D  (630) 840-8525
> > timm at fnal.gov  http://home.fnal.gov/~timm/
> > Fermilab Scientific Computing Division, Scientific Computing Services
> Quad.
> > Grid and Cloud Services Dept., Associate Dept. Head for Cloud Computing
> >
> >
> >
> > --
> > --
> > Daniel Molina
> > Project Engineer
> > OpenNebula - Flexible Enterprise Cloud Made Simple
> > www.OpenNebula.org | dmolina at opennebula.org | @OpenNebula
>
>


-- 
--
Daniel Molina
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | dmolina at opennebula.org | @OpenNebula
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opennebula.org/pipermail/users-opennebula.org/attachments/20141015/56f14206/attachment.htm>