9:36 a.m.
Hi,
Our current consideration is add a new thread in engine's side to attest all of hosts
(aggregated query from attestation sever) one time in case of engine's rebooting.
There is still one potential issue under extreme condition, saying, hundreds of nodes in a
datacenter, attest all of hosts still may take couple of mins, let's say, one hacked
untrusted node before receiving the latest status may considered as a trusted host, so,
the worst case in a datacenter with hundreds of nodes is,
1. engine is down for some reasons and boot up again, some trusted nodes may be hacked and
rebooted during this period.
2. our thread is running to get all of node's status (trust /untrusted), may take
couple of mins in large datacenter.
2. user create VMs on these hacked nodes and believe these VMs are trusted VMs launched on
trusted nodes.
3. our thread get the correct status of these untrusted nodes, set these nodes as
non-operational.
4. all of these "trusted" VMs running on these untrusted nodes are expected to
migrate to other trusted node.
So, the question is in a trusted cluster with hundreds of nodes some VMs expected to
create on trusted nodes may actually create on untrusted nodes instead, and this time may
last for couple of mins. (worst case in my view is 10 mins with 1000 nodes).
Does this acceptable from your point of view? Or any other suggestion?
Best Regards,
Dave Chen
-----Original Message-----
From: Doron Fediuck [mailto:dfediuck@redhat.com]
Sent: Sunday, April 21, 2013 11:58 PM
To: Chen, Wei D
Cc: Ofri Masad; Oved Ourfalli; engine-devel(a)ovirt.org
Subject: Re: [Engine-devel] Design wiki page for trusted compute pools
integration with oVirt has been updated
----- Original Message -----
> From: "Wei D Chen" <wei.d.chen(a)intel.com>
> To: "Ofri Masad" <omasad(a)redhat.com>
> Cc: "Oved Ourfalli" <ovedo(a)redhat.com>, engine-devel(a)ovirt.org
> Sent: Sunday, April 21, 2013 4:00:55 PM
> Subject: Re: [Engine-devel] Design wiki page for trusted compute pools
> integration with oVirt has been updated
>
> Ofri,
>
> Absolutely right, aggregated query has a significantly time improve
> compared to separated queries. I agree a aggregated query on engine's
> starting. Is it possible to invoke attestation service in engine's
> initialization code block instead of "quartz job"? Is there any class
similar with
"
> InitVdsOnUpCommand " for engine's initialization?
>
> Best Regards,
> Dave Chen
>
org.ovirt.engine.core.bll.Backend.Initialize()
Note you cannot block this method while waiting for results.
Instead I suggest you fire a one-time background request from this method.
> -----Original Message-----
> From: Ofri Masad [mailto:omasad@redhat.com]
> Sent: Sunday, April 21, 2013 3:29 PM
> To: Chen, Wei D
> Cc: Oved Ourfalli; engine-devel(a)ovirt.org; Itamar Heim
> Subject: Re: [Engine-devel] Design wiki page for trusted compute pools
> integration with oVirt has been updated
>
> Dave,
>
> If I'm not mistaking, there is a big difference between separated
> queries to the attestation server and aggregated one?
> Is it true?
>
> Thanks,
> Ofri
>
> ----- Original Message -----
> > From: "Itamar Heim" <iheim(a)redhat.com>
> > To: "Ofri Masad" <omasad(a)redhat.com>
> > Cc: "Oved Ourfalli" <ovedo(a)redhat.com>, "Wei D
Chen"
> > <wei.d.chen(a)intel.com>, engine-devel(a)ovirt.org
> > Sent: Sunday, April 21, 2013 10:20:17 AM
> > Subject: Re: [Engine-devel] Design wiki page for trusted compute
> > pools integration with oVirt has been updated
> >
> > On 04/21/2013 10:13 AM, Ofri Masad wrote:
> > > Hi,
> > > One more thing we need to think about for the second approach -
> > > aggregated query. On engine start we need to determine the trust
> > > state of all the hosts. sending a separate query for each host
> > > will overload the attestation host and the network. an initial
> > > aggregated query needs to be send when the engine starts.
> > > Same thing can happen after management network fail and so on.
> > > Maybe we can run a quartz job every x minutes, checking if a large
> > > part of the hosts in the cluster (like 30%) are untrusted - in
> > > that case run the aggregated query.
> >
> > are we sure this optimization is needed?
> > how heavy/latent is the call to the attestation service?
> >
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