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Comments inline.

Salvatore

On 25 March 2014 07:03, Ageeleshwar Kandavelu <
Ageeleshwar.Kandavelu at csscorp.com> wrote:

>  Hi,
>
> I have two queries regarding neutron ovs agent.
>
> 1. Correct me if I am wrong the ovs agent polls the neutron database for
> changes before creating resources. Why does the agent have to register with
> neutron-server. When I give 'neutron agent-list' I can see all the agents
> (l3, dhcp, ovs-plugin). What is the communication interface between the
> neutron-server and the agents. A link to the documentation would do.
>

The latest version of the neutron agent which had direct access to the
database was Essex. Since Folsom, there is a RPC interface, which is the
one the agent uses to report the state you see with neutron agent-list.

Also, the agent configures iptables rules for implementing security groups,
and creates gre tunnels if you're using this transport mode; it does not
create however tap interfaces, but merely wires them to the appropriate
network.


> 2. I recon that the ovs agent is using subprocess to create interfaces on
> openvswitch. What api does it use to handling namespaces i.e., to create
> interfaces inside non default network namespace.
>

As stated earlier the OVS agent does not create interface. Other agents,
such as DHCP and L3, do that. This, and ns management, is achieved with a
purpose built library: neutron.agent.linux.ip_lib

>
> Thank you,
> Ageeleshwar K
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