Wikimedia Cloud Services team/EnhancementProposals/Neutron SDN

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This page is a dumping ground for links and documentation in the process of moving CloudVPS to using Neutron.

Preamble

http://research.esg-global.com/reportaction/blog0419201602/Toc

https://wiki.openstack.org/wiki/Meetings/TechnicalCommittee/Neutron_Gap_Coverage

https://www.quora.com/Whats-the-difference-between-the-OpenStack-Networking-neutron-and-the-Legacy-Networking-nova-network

https://review.openstack.org/#/c/101921/

https://docs.openstack.org/ocata/networking-guide/intro-os-networking.html

https://docs.openstack.org/admin-guide/networking-adv-features.html

Labtest Allocations

See Testing deployment.

Open questions

/etc/nova/nova-compute.conf is managed but unused?

Can the migration be performed online? (as in data plane)
Should we use linux bridging or OpenVSwitch?
- Linux bridging is simpler conceptually and component wise but not as featurefull.
- What Neutron plugin should we use?

What type and mechanism should we use?
Does L2 Population work as expected?
VXLAN
- Overhead
- debugging

Conceptual

http://events.linuxfoundation.org/sites/events/files/slides/LinuxConJapan2014_makita_0.pdf

http://www.opencloudblog.com/?p=96

http://www.sparkmycloud.com/blog/openstack-vlan-networking-overview/

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_openstack_platform/7/html/networking_guide/

Topology

https://docs.openstack.org/mitaka/install-guide-ubuntu/neutron-controller-install-option2.html

https://wiki.openstack.org/wiki/Neutron/sharing-model-for-external-networks

The shared switch is a Boolean value that, when set to true, allows a network to be utilized among all tenants. This attribute is available only for networks created by administrators and is not available for networks created by users.

Denton, James (2015-11-27). Learning OpenStack Networking (Neutron) - Second Edition (p. 129). Packt Publishing. Kindle Edition.

Neutron l2/l3 agents https://www.youtube.com/watch?v=uNAkDfkTGBw

Migration(s)

https://docs.openstack.org/kilo/networking-guide/migration.html

https://specs.openstack.org/openstack/neutron-specs/specs/kilo-backlog/migration-from-nova-net.html

https://docs.openstack.org/liberty/networking-guide/migration-nova-network-to-neutron.html

General overview of transition mechanics with no real technical insight
assumes things exist and are working such as 'Run a DB dump/restore tool that creates Networking data structures representing current legacy networking config.'

https://wiki.openstack.org/wiki/Neutron/MigrationFromNovaNetwork/HowTo#How_to_test_migration_process

TODO - fill in the migration process script here -^^
very limited test case only using devstack
http://paste.openstack.org/show/84177/
https://review.openstack.org/#/c/100265/ (depends on and abandoned)
depends on https://review.openstack.org/#/c/100265/7/nova/api/openstack/compute/contrib/admin_actions.py and associated completely
- custom behavior from patch example (unproven and unloved): nova migration-to-neutron <vm-id> <neutron-net-id>

Spec for Neutron Migration feature (permanent -2?)

https://review.openstack.org/#/c/101921/12/specs/juno/neutron-migration.rst

https://review.openstack.org/#/c/101921/
https://review.openstack.org/#/c/111755/
https://review.openstack.org/#/c/115635/
This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

http://lists.openstack.org/pipermail/openstack/2017-March/018903.html (andrew asking for migration stories)

https://www.rivy.org/2012/11/switch-your-kvm-from-regular-bridge-to-open-vswitch/

https://github.com/NeCTAR-RC/novanet2neutron

https://www.youtube.com/watch?v=54wp1yzC-d8 (cern migration story)

http://superuser.openstack.org/articles/ebay-in-production-migration-from-nova-network-to-neutron/

https://www.slideshare.net/ChengyuanLi/seamless-migration-from-nova-network-to-neutron-in-e-bay-production20141104

https://blueprints.launchpad.net/neutron/+spec/allow-specific-floating-ip-address

http://www.stillhq.com/openstack/juno/000014.html

OpenVSwitch

http://docs.openvswitch.org/en/latest/faq/issues/

https://media.readthedocs.org/pdf/openvswitch/latest/openvswitch.pdf

https://pve.proxmox.com/wiki/Open_vSwitch

Managing Open vSwitch across a large heterogenous fleet (rackspace)

2.1+ described as best and ubuntu seems to be on 2.0 (flow-eviction-thresholds) via apt-cache
2.3 is OVS LTS

http://manpages.ubuntu.com/manpages/trusty/man8/ovs-controller.8.html

Virtual networks can be composed of multiple segments of the same or different types.
- EXCEPT: The database schema and driver APIs support multi-segment networks, but the client API for multi-segment networks is not yet implemented.

https://wiki.openstack.org/wiki/Neutron/ModularL2Agent (original spec)

http://docs.ocselected.org/openstack-manuals/kilo/networking-guide/content/ml2_l2pop_scenarios.html

https://docs.openstack.org/ocata/config-reference/networking/networking_options_reference.html#modular-layer-2-ml2-plug-in-configuration-options

https://assafmuller.com/2014/02/23/ml2-address-population/