Hi guys:
As we know, nova will interacts with neutron for port creating and
configuration while creating VM.
In the method /nova/virt/libvirt/driver.py:_create_domain_and_network, here
nova ultilizes event mechanism(sqlalchemy) to monitor port status in neutron
DB. After having subscribed event from neutron DB for port status update, it
will wait for the event sent from neutron. Finally nova revceive port status
update event sent from neutron server, which means port is ready and the
creating of VM will almost complete. But it seems like the creating of VM will
fail if nova not receive event after the timeout period(default 300s).
What the problem I have encountered is that the VM have been created
successfully without the notification event send from neutron. Using command
"nova show VM-ID" shows all states of VM are correct(vm_state: active and power
state: running). Let's assume a scenario where we replace neutron agent with
controller, as in the case of OVN, dragonflow, ODL,etc.
There is an example to support port 'up' or 'down ' notification in project
OVN. Please refer to this link: https://review.openstack.org/#/c/178826/
So, anyone can give an explanation what's the purpose of the event? Dose the
event have any impact on creating of VM? Any comment will be appreciated,
thanks!
Best Regard!Jingting
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