6:06 a.m.
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I like the ideas of 2-phase aggregated attestation & cluster-by-cluster
order.
But I want to understand the process more clearly.
Without TCP, how does engine handle the states of existing hosts during
engine booting? Will engine put all existing hosts in non-operational =
state
and then perform some check via VDSM then turn it into operational =
state?
Put host in non-operational state will cause VM migration, right?
Or there is a global state in engine to indicate whether user is allowed =
to
create VM?
Thanks
Jimmy
Itamar Heim wrote on=A02013-04-28:
On 04/28/2013 11:34 AM, Doron Fediuck wrote:
> Hi Dave,
>=20
> Just to make sure I fully understand, I'll repeat your basic =
arguments;
>=20
> 1. It takes time to query a big number of hosts (hundreds).
>=20
> 2. When backend is booting, a user may start a VM on a host which was
> hacked during the downtime of the engine.
>=20
> If the above is your concern, it shouldn't be so.
> The reason is, that no host will become operational before you get a
response
> from the attestation server and allow it to become operational.
So a =
user
> cannot start a new VM on a non-operational host.
=20
i'd do the queries in groups of "cluster", so cluste-by-cluster they =
get
unblocked. cluster without attestation service shouldn't block on
this
of course.
=20
>=20
> What this means is that your thread may need to update the user by
sending
> a periodic event that a large scale attestation operation is in =
progress.
> Other than that, maybe your thread can work in smaller groups if
it =
gets
> better results? ie- instead of one query for 300 hosts, maybe you
can =
run
> 3 serialized queries for 100 hosts each?
> If this does not help, maybe you can run a short query for something =
like
> 10 hosts, which should get an answer relatively fast. The you can
=
issue a
> query for the other 290 hosts which will take longer. In this way
the
system
> may get 10 hosts to work with quite fast, and later on the other
290
hosts
> will join... So this can actually be configurable to a 2-phase =
process;
> a short query and a longer one. The admin can choose the short
query =
size
> based on his setup, and the longer query can pick up all the
other =
hosts.
> What do you think?
>=20
> Doron
>=20
> ----- Original Message -----
>> From: "Wei D Chen" <wei.d.chen(a)intel.com> To: "Doron
Fediuck"
>> <dfediuck(a)redhat.com> Cc: "Oved Ourfalli"
<ovedo(a)redhat.com>,
>> engine-devel(a)ovirt.org Sent: Saturday, April 27, 2013 9:36:44 AM
>> Subject: Re: [Engine-devel] Design wiki page for trusted compute =
pools
>> integration with oVirt has been updated
>>=20
>> Hi,
>>=20
>> 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.
>>=20
>> 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?
>>=20
>>=20
>> Best Regards,
>> Dave Chen
>>=20
>>=20
>> Doron Fediuck wrote on 2013-04-21:
>>> integration with oVirt has been updated
>>>=20
>>>=20
>>>=20
>>> ----- 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
>>>>=20
>>>> Ofri,
>>>>=20
>>>> 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?
>>>>=20
>>>> Best Regards,
>>>> Dave Chen
>>>>=20
>>> org.ovirt.engine.core.bll.Backend.Initialize()
>>>=20
>>> Note you cannot block this method while waiting for results. =
Instead
>>> I suggest you fire a one-time background request from
this method.
>>>=20
>>>=20
>>> Ofri Masad wrote on 2013-04-21:
>>>> integration with oVirt has been updated
>>>>=20
>>>> Dave,
>>>>=20
>>>> If I'm not mistaking, there is a big difference between separated
>>>> queries to the attestation server and aggregated one?
>>>> Is it true?
>>>>=20
>>>> Thanks,
>>>> Ofri
>>>>=20
>>>> ----- 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
>>>>>=20
>>>>> 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.
>>>>>=20
>>>>> are we sure this optimization is needed?
>>>>> how heavy/latent is the call to the attestation service?
>>>>>=20
>>>> _______________________________________________
>>>> Engine-devel mailing list
>>>> Engine-devel(a)ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/engine-devel
>>>>=20
>> _______________________________________________
>> Engine-devel mailing list
>> Engine-devel(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/engine-devel
>>=20
> _______________________________________________
> Engine-devel mailing list
> Engine-devel(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/engine-devel
>=20
=20
_______________________________________________
Engine-devel mailing list
Engine-devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/engine-devel
Jimmy
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