[openstack-dev] [Kuryr] IPVLAN data path proposal

Irena Berezovsky irenab.dev at gmail.com
Mon Sep 12 15:14:35 UTC 2016


Hi Ivan,
The approach looks very interesting and seems to be reasonable effort to
make it work with kuryr as alternative to the 'VLAN aware VM' approach.
Having container presented as neutron entity has its value, especially for
visibility/monitoring (i.e mirroring) and security  (i.e applying security
groups).
But I do think that for short term, this approach is a good way to provide
Container in VM  support.
I  think it's worth to submit devref to kuryr to move forward.
BR,
Irena

On Mon, Sep 12, 2016 at 2:29 PM, Coughlan, Ivan <ivan.coughlan at intel.com>
wrote:

>
>
> *Overview*
>
> Kuryr proposes to address the issues of double encapsulation and exposure
> of containers as neutron entities when containers are running within VMs.
>
> As an alternative to the vlan-aware-vms and use of ovs within the VM, we
> propose to:
>
> -          Use allowed-address-pairs configuration for the VM neutron port
>
> -          Use IPVLAN for wiring the Containers within VM
>
>
>
> In this way:
>
> -          Achieve efficient data path to container within VM
>
> -          Better leverage OpenStack EPA(Enhanced Platform Awareness)
> features to accelerate the data path (more details below)
>
> -          Mitigate the risk of vlan-aware-vms not making neutron in time
>
> -          Provide a solution that works on existing and previous
> openstack releases
>
>
>
> This work should be done in a way permitting the user to optionally select
> this feature.
>
>
>
>
> *Required Changes*
>
> The four main changes we have identified in the current kuryr codebase are
> as follows:
>
> ·         Introduce an option of enabling “IPVLAN in VM” use case. This
> can be achieved by using a config file option or possibly passing a command
> line argument. The IPVLAN master interface must also be identified.
>
> ·         If using “IPVLAN in VM” use case, Kuryr should no longer create
> a new port in Neutron or the associated VEth pairs. Instead, Kuryr will
> create a new IPVLAN slave interface on top of the VM’s master interface and
> pass this slave interface to the Container netns.
>
> ·         If using “IPVLAN in VM” use case, the VM’s port ID needs to be
> identified so we can associate the additional IPVLAN addresses with the
> port. This can be achieved by querying Neutron’s show-port function and
> passing the VMs IP address.
>
> ·         If using “IPVLAN in VM” use case, Kuryr should associate the
> additional IPVLAN addresses with the VMs port. This can be achieved using
> Neutron’s allowed-address-pairs flag in the port-update function. We
> intend to make use of Kuryr’s existing IPAM functionality to request these
> IPs from Neutron.
>
>
>
> *Asks*
>
> We wish to discuss the pros and cons.
>
> For example, containers exposure as proper neutron entities and the
> utility of neutron’s allowed-address-pairs is not yet well understood.
>
>
>
> We also wish to understand if this approach is acceptable for kuryr?
>
>
>
>
>
> *EPA*
>
> The Enhanced Platform Awareness initiative is a continuous program to
> enable fine-tuning of the platform for virtualized network functions.
>
> This is done by exposing the processor and platform capabilities through
> the management and orchestration layers.
>
> When a virtual network function is instantiated by an Enhanced Platform
> Awareness enabled orchestrator, the application requirements can be more
> efficiently matched with the platform capabilities.
>
> http://itpeernetwork.intel.com/openstack-kilo-release-is-
> shaping-up-to-be-a-milestone-for-enhanced-platform-awareness/
>
> https://networkbuilders.intel.com/docs/OpenStack_EPA.pdf
>
> https://www.brighttalk.com/webcast/12229/181563/epa-
> features-in-openstack-kilo
>
>
>
>
>
> Regards,
>
> Ivan….
>
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