Neutron OVS agent on Windows
Spec for porting Neutron OVS agent to Windows. Change-Id: I319818a8de9cf71ae2eaf984ca3491aba0b1cc30 Implements: blueprint hyper-v-ovs-agent
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Gabriel Adrian Samfira
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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==========================================
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Neutron OVS agent on Windows
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==========================================
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https://blueprints.launchpad.net/neutron/+spec/hyper-v-ovs-agent
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Thanks to the porting of Open vSwitch to Hyper-V is is now also possible to
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have the Neutron OVS L2 agent to work on both Linux and Windows. Most of the
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porting activity consists in replacing Linux specific dependencies with
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portable alternatives in the Neutron OVS agent, considering in particular that
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the agent primarily execs OVS CLI commands, and that OVS has an identical
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command line interface on both Linux and Windows.
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Problem Description
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===================
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Current implementation of OVS agent has a few GNU/Linux specific components:
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* The use of rootwrap. This is not necessary on Windows.
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* fcntl is used in agent.linux.utils which is imported by
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agent.linux.ovs_lib. It is also used by eventlet to set non blocking I/O.
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fcntl is not available on Windows, so any dependency on this will be
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replaced with Windows compatible alternatives.
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* ovsdb_monitor.SimpleInterfaceMonitor currently only works on GNU/Linux.
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The reason for this is that agent.linux.async_process.AsyncProcess() uses
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platform specific components like the kill command. A Windows alternative
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will be created to address this.
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Proposed Change
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===============
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Considering that OVS agent currently uses a series of exec calls to ovs-vsctl
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and ovs-ofctl ovs_lib and parts (if not all) of utils will be almost identical
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on both Linux and Windows. This implies that they will have to be moved from
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neutron.agent.linux to a common location, e.g.: neutron.agent.common.
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A base class will be created and platform specific differences will be
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abstracted (for example, the need for rootwrap).
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Data Model Impact
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-----------------
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None
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REST API Impact
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---------------
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None.
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Security Impact
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---------------
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None.
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Notifications Impact
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--------------------
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None.
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Other End User Impact
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---------------------
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None.
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Performance Impact
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------------------
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None.
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IPv6 Impact
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-----------
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None.
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Other Deployer Impact
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---------------------
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This change will require the user to install Open vSwitch on Hyper-V before
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deploying neutron ovs agent, and make the binaries
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available in the PATH.
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Developer Impact
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----------------
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None.
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Community Impact
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----------------
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None
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Alternatives
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------------
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The Neutron Hyper-V agent offers already support for the ML2 plugin, which in
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turn allows interoperability with
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othe mechanism drivers, inclusing Open vSwitch.
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The main limitation of this option is that since Hyper-V does not support
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VXLAN or GRE encapsulation natively, networking is limited to the VLAN and
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flat options.
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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gabriel-samfira
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Work Items
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----------
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* Move neutron.agent.linux.ovs_lib and parts of neutron.agent.linux.utils to
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neutron.agent.common
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* Create a base class for interactig with Open vSwitch, and abstract away the
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differences that are platform specific.
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* remove the need for roowrap. Only enable it on GNU/Linux
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* update/add unit tests accordingly
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Dependencies
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============
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This change does not directly depend on any other blueprint. It is however
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related to:
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https://blueprints.launchpad.net/nova/+spec/hyper-v-ovs-vif
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Testing
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=======
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This feature will be tested by the Hyper-V CI.
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Tempest Tests
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-------------
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Current tempest tests are sufficient.
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Functional Tests
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----------------
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Functional tests will be added as needed.
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API Tests
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---------
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None.
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Documentation Impact
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====================
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User Documentation
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------------------
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Documentation should reflect that OVS agent now works on Hyper-V as well.
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Developer Documentation
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-----------------------
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None.
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References
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==========
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[1] https://blueprints.launchpad.net/nova/+spec/hyper-v-ovs-vif
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[2] https://github.com/openvswitch/ovs
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[3] http://www.cloudbase.it/open-vswitch-on-hyper-v
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[4] https://github.com/gabriel-samfira/neutron/tree/windows-ovs-agent-poc
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