Thanks gong,
I also noticed that, what is wisdom behind this "delay update"?
I encountered a problem in current openstack. After I installed openstack
with devstack with "multi_host=1", I found newly started instance can not
get a fix ip from dhcp server, since nova-br100.conf didn't hold the
related information. but when I start the second instance, at this point
the mac/fix_ip information for the first instance will then be written to
nova-br100.conf and the first instance work well.
my guest for this problem is like this:
(1)nova-scheduler did not update the "host" field in database,
(2)so nova-network cann't get the mac/ip information, so nova-br100.conf is
empty and instance can not get its fix ip.
related code: nova/network/linux_net.py
def get_dhcp_hosts(context, network_ref):
"""Get network's hosts config in dhcp-host format."""
hosts = []
host = None
if network_ref['multi_host']:
host = FLAGS.host
#pdb.set_trace()
for data in db.network_get_associated_fixed_ips(context,
network_ref['id'],
host=host):
hosts.append(_host_dhcp(data))
return '\n'.join(hosts)
(3)the second instance is started, at this time, the "host" field for first
instance is already updated by self.compute_rpcapi.run_instance.
(4)nova-network get the mac/ip information correctly and dump to
nova-br100.conf, so the first instance can get its fix ip.
any comments??
-----------------------------------------------------------------
韦远科
中国科学院 计算机网络信息中心
北京市海淀区中关村南四街四号 349信箱(100190)
Yuanke Wei (Wei)
Computer Network Information Center,Chinese Academy of Sciences
4 Zhongguancun Nansijie, Haidian District, Beijing 100190, China
P.O. Box 349
gtalk: weiyuanke...@gmail.com
msn: weiyuanke...@hotmail.com
On Fri, Oct 12, 2012 at 10:14 AM, gong yong sheng <
gong...@linux.vnet.ibm.com> wrote:
> read on:
> we will send the host to compute manager:
>
>
> def _provision_resource(self, context, weighted_host, request_spec,
> filter_properties, requested_networks, injected_files,
> admin_password, is_first_time, instance_uuid=None):
> """Create the requested resource in this Zone."""
> # Add a retry entry for the selected compute host:
> self._add_retry_host(filter_properties,
> weighted_host.host_state.host)
>
> self._add_oversubscription_policy(filter_properties,
> weighted_host.host_state)
>
> payload = dict(request_spec=request_spec,
> weighted_host=weighted_host.to_dict(),
> instance_id=instance_uuid)
> notifier.notify(context, notifier.publisher_id("scheduler"),
> 'scheduler.run_instance.scheduled', notifier.INFO,
> payload)
>
> updated_instance = driver.instance_update_db(context,
> instance_uuid)
>
> self.compute_rpcapi.run_instance(context,
> instance=updated_instance,
> host=weighted_host.host_state.host,
> request_spec=request_spec,
> filter_properties=filter_properties,
> requested_networks=requested_networks,
> injected_files=injected_files,
> admin_password=admin_password, is_first_time=is_first_time)
>
> On 10/12/2012 09:54 AM, 韦远科 wrote:
>
> hi,
>
> I read the following code in nova scheduler and have some questions with
> the code marked in yellow.
> the following code can be found at "
> https://github.com/openstack/nova/blob/master/nova/scheduler/filter_scheduler.py
> "
>
>
>
> def _provision_resource(self, context, weighted_host, request_spec,
>
>
> filter_properties, requested_networks, injected_files,
>
>
> admin_password, is_first_time, instance_uuid=None):
>
>
> """Create the requested resource in this Zone."""
>
>
> # Add a retry entry for the selected compute host:
>
>
> self._add_retry_host(filter_properties, weighted_host.host_state.host)
>
>
>
> self._add_oversubscription_policy(filter_properties,
>
>
> weighted_host.host_state)
>
>
>
>
> payload = dict(request_spec=request_spec,
>
>
> weighted_host=weighted_host.to_dict(),
>
>
> instance_id=instance_uuid)
>
>
> notifier.notify(context, notifier.publisher_id("scheduler"),
>
>
> 'scheduler.run_instance.scheduled', notifier.INFO,
>
>
> payload)
>
>
>
>
> updated_instance = driver.instance_update_db(context, instance_uuid)
>
>
> #at this point, we already know the host which will provision the
> instance, that is recorded in variable *weighted_host.*
>
>
> * *But actually, the *instance_update_db* function only update "values
> = {'host': None, 'scheduled_at': now}" in database,
>
>
> So why????
>
>
>
>
>
>
> can someone give me some help? thanks very much!
>
>
>
>
> -----------------------------------------------------------------
> 韦远科
> 中国科学院 计算机网络信息中心
> 北京市海淀区中关村南四街四号 349信箱(100190)
>
> Yuanke Wei (Wei)
> Computer Network Information Center,Chinese Academy of Sciences
> 4 Zhongguancun Nansijie, Haidian District, Beijing 100190, China
> P.O. Box 349
> gtalk: weiyuanke...@gmail.com
> msn: weiyuanke...@hotmail.com
>
>
>
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