[Openstack] Running code on instance start/terminate
Rogério Vinhal Nunes
rogervn at dcc.ufmg.br
Thu Mar 29 17:50:53 UTC 2012
Actually, I'm having problems in a much simpler layer. I've done the
following code thinking that I would start from there to find info:
---------------------
conn = amqp.Connection(host="localhost:5672", userid="guest",
password="guest", virtual_host="/", insist=False)
chan = conn.channel()
chan.queue_bind(queue="compute", exchange="nova", routing_key="
notifications.info")
def recv_callback(msg):
print 'Received: ' + msg.body + ' from channel #' +
str(msg.channel.channel_id)
chan.basic_consume(queue='compute', no_ack=True, callback=recv_callback,
consumer_tag="testtag")
while True:
chan.wait()
chan.basic_cancel("testtag")
chan.close()
conn.close()
---------------------
But I get no messages at all. The script just stays still. I've added
"--notification_driver=nova.notifier.rabbit_notifier" to nova.conf also.
Em 28 de março de 2012 18:46, Sandy Walsh <sandy.walsh at rackspace.com>escreveu:
> Look at
> https://github.com/rackspace/stacktach/blob/master/worker.py
> (ignore the _process() call, just look at how the queue listeners are
> set up)
>
> my worker_conf.py looks something like
> DEPLOYMENTS = [
> dict(
> tenant_id=1,
> url='http://stacktach.example.com',
> rabbit_host="10.0.0.1",
> rabbit_port=5672,
> rabbit_userid="nova-staging",
> rabbit_password="password",
> rabbit_virtual_host="staging"),
> dict(
> tenant_id=2,
> url='http://stacktach.example.com',
> rabbit_host="10.99.0.1",
> rabbit_port=5672,
> rabbit_userid="nova",
> rabbit_password="password",
> rabbit_virtual_host="production"),
> ]
>
>
> Or the queue listeners in
> https://github.com/Cerberus98/yagi
>
> Hope it helps!
> -Sandy
>
>
> On 03/28/2012 05:27 PM, Leander Bessa wrote:
> >>From what i have figured out so far, the exchange queue is "nova" and
> > the routing key in your case is "notifications.info
> > <http://notifications.info>".
> >
> > On Wed, Mar 28, 2012 at 9:05 PM, Rogério Vinhal Nunes
> > <rogervn at dcc.ufmg.br <mailto:rogervn at dcc.ufmg.br>> wrote:
> >
> > I'm trying to find out information to make an application that
> > consumes the compute info, but I'm having some trouble. Is there a
> > better documentation I could follow and the precise details of the
> > queue/exchange/routing_key needed to take information at the end of
> > each run-instance and terminate-instance?
> >
> > Also, I'm using amqplib and I saw that Openstack uses an internal
> > library named Carrot that uses amqplib. Would it be better to use it
> > instead?
> >
> > Em 27 de março de 2012 12:42, Sandy Walsh <sandy.walsh at rackspace.com
> > <mailto:sandy.walsh at rackspace.com>> escreveu:
> >
> > I believe '.exists' is sent via a periodic update in
> > compute.manager.
> >
> >
> >
> > On 03/27/2012 12:08 PM, Leander Bessa wrote:
> > > Hello,
> > >
> > > I've been following this topic and i've been trying to receive
> the
> > > notifications directly from rabbitmq with python+pika. So i far
> > > i've managed to receive the start/terminate events and
> > everything in
> > > between. What i am unable to find though is the topic regarding
> > > _compute.instance.exists_
> > > from http://wiki.openstack.org/SystemUsageData. Does this even
> > exist, or
> > > is there some extra configuration required with nova?
> > >
> > > Regards,
> > >
> > > Leander
> > >
> > > On Mon, Mar 26, 2012 at 4:54 PM, Russell Bryant
> > <rbryant at redhat.com <mailto:rbryant at redhat.com>
> > > <mailto:rbryant at redhat.com <mailto:rbryant at redhat.com>>>
> wrote:
> > >
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA1
> > >
> > > On 03/26/2012 11:48 AM, Russell Bryant wrote:
> > > > On 03/26/2012 10:15 AM, Rogério Vinhal Nunes wrote:
> > > >> Hello,
> > > >>
> > > >> I'm developing a application to work along with
> > openstack. My
> > > >> application needs to keep track of all instances being
> > started
> > > >> or terminated such as feeding it information about the
> > location,
> > > >> status and other information about launched and
> terminated
> > > >> instances. The current version makes timed queries to
> > OpenStack
> > > >> database, but this is showing to be a little consuming
> and
> > > >> inefficient, so I would like to add a portion of code
> > to make
> > > >> OpenStack actively feed my application information
> > whenever an
> > > >> instance changes its status or location.
> > > >>
> > > >> What is the least intrusive way to do that? It would be
> > very nice
> > > >> if OpenStack provided a way to run code on these
> situations
> > > >> without actually changing any code, such as defining a
> > directory
> > > >> of scripts to run in every instance status change.
> > > >
> > > > Check out the notifications system:
> > > >
> > > > http://wiki.openstack.org/NotificationSystem
> > > >
> > >
> > > That wasn't the page I thought it was ... I meant:
> > >
> > > http://wiki.openstack.org/SystemUsageData
> > >
> > > You can consume these events via AMQP if you configure
> > nova to use the
> > > rabbit notifier.
> > >
> > > - --
> > > Russell Bryant
> > > -----BEGIN PGP SIGNATURE-----
> > > Version: GnuPG v1.4.12 (GNU/Linux)
> > > Comment: Using GnuPG with Mozilla -
> > http://enigmail.mozdev.org/
> > >
> > >
> > iEYEARECAAYFAk9wkSgACgkQFg9ft4s9SAYFuACfUu23qtxiH6WLCJNyd9gBf8i1
> > > FwQAnifjwWkFHYxo+KhYt8TAWEzTaMYZ
> > > =UWlH
> > > -----END PGP SIGNATURE-----
> > >
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