Hello,
some days ago I was asking you about creating extension and service
plugin for Neutron. Now, I am trying to find how to create database
model for this plugin and agent :)
Could you check if I am understanding this issues properly?
The database model for new plugin should be created in neutron/db
directory. The model classes should inherit:
1. neutron.db.model_base.BASEV2, which is related to NeutronBaseV2 class
2. if model should contain id or relation to tenant, it should inherit
also HasTenant and HasId from module neutron.db.models_v2
3. All other fields should be defined according to sqlalchemy orm.
I have also question - how Neutron knows (or sqlalchemy) which
models/tables should be created in database? At this moment I cannot
find any code, which initializes the database. The only thing which I
found is declarative.declarative_base in db.model_base
And one question about creating new agents - is it just thread/process,
which is managed by Neutron? I was analysing lbaas code and it is just
python script in /usr/bin/, which executes class. Do I have to create
anything additional like with database or service plugin to create new
agent? Or scripts like in LBAAS will be enough + init script?
I also found great diagram, which describes in a nut shell how Neutron
service plugins are organised internal:
https://wiki.openstack.org/wiki/Neutron/LBaaS/Architecture
Maybe it would be good idea to put diagram like this to official dev
wiki? Of corse after some modifications. Now wiki points to the
SecurityGroups code, which is not very helpful for beginners like me :)
regards!
Maciej
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