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Hi Leo,

Every agent keeps anyway an in-memory state throughout its execution.
The agents indeed have no persistent storage - at least not in the usual
form of a database. They however rely on data other than the neutron
database.

For instance for the l2 agent, ovsdb itself is a source of information. The
agent periodically scans it to detect interfaces which are brought up or
down.
As another example the dhcp agent stores its current state a 'data'
directory (if you're using devstack it's usually
/opt/stack/data/neutron/dhcp)

Hope this helps,
Salvatore





On 7 March 2015 at 13:05, Leo Y <minherz at gmail.com> wrote:

> Hello,
>
> Where within the code of neutron agents I can find structure(s) that store
> network information? The agent has to know all current networks and ports
> in use by all VMs that are running in its compute node. Does anyone know
> where this information is stored except for neutron DB?
>
> Thank you
>
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