doc: internal document on openstack cooperation
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
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.. _how_it_works:
|
||||
|
||||
****************************
|
||||
How Ryu L2 segregation works
|
||||
****************************
|
||||
This section describes how Ryu L2 segregation works.
|
||||
|
||||
tenant/network id creation
|
||||
==========================
|
||||
When tenant(= network id) is created, Quantum server tells it to Ryu.
|
||||
Ryu remembers the network id.
|
||||
|
||||
.. image:: /images/network-creation.png
|
||||
|
||||
|
||||
association OVS port to network id
|
||||
==================================
|
||||
#. When VM instance is created, the network port is created in OVS and
|
||||
it is associated to network id that VM belongs to.
|
||||
|
||||
#. quantum OVS agent tells the associated (network id, ovs port) to Ryu.
|
||||
Ryu remembers (network id, ovs port) relationship.
|
||||
|
||||
#. quantum OVS agent also tells to Ryu which OVS port is not managed by
|
||||
nova/quantum, but is connected to external ether cable.
|
||||
We call it external OVS port or that the port is external.
|
||||
|
||||
|
||||
.. image:: /images/assoc-ovs-port.png
|
||||
|
||||
|
||||
mac learing
|
||||
===========
|
||||
When VM sends packets, Ryu determins network id from OVS port and then
|
||||
associates src mac address to network id.
|
||||
|
||||
.. image:: /images/mac-learning.png
|
||||
|
||||
|
||||
packet filtering(L2 unicast case)
|
||||
=================================
|
||||
* When VM sending L2-unicast packet, Ryu checks if the destination mac
|
||||
address belongs to the same netowrk id of the source mac address which
|
||||
is same to the network id that the OVS port is associated to.
|
||||
* If no, the packet is dropped.
|
||||
* If yes, send the packet is sent to ports which belongs to the same
|
||||
network id and external port.
|
||||
|
||||
.. image:: /images/filtering-outgoing.png
|
||||
.. image:: /images/filtering-incoming.png
|
||||
|
||||
|
||||
packet filtering(L2 broadcast case)
|
||||
===================================
|
||||
* When VM sending L2-broadcast/multicaset packet, Ryu checks if the source
|
||||
mac address.
|
||||
* send the packet to all external ports and all OVS ports that belongs
|
||||
to the same network id of the source mac address.
|
||||
* When receiving broacast/multicast packet from the external ports,
|
||||
Ryu checks if the source mac address belongs to known network id.
|
||||
|
||||
* If yes, send the packet to the external ports except incoming one
|
||||
and the all OVS ports that belongs to the network id
|
||||
* if no, drop the packet.
|
||||
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.. image:: /images/filtering-broadcast.png
|
Before Width: | Height: | Size: 73 KiB |
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193
doc/source/internals_l2_isolation.rst
Normal file
@ -0,0 +1,193 @@
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.. _internals_l2_isolation:
|
||||
|
||||
****************
|
||||
Ryu L2 isolation
|
||||
****************
|
||||
This section describes how Ryu cooperates with Openstack Quantum and
|
||||
how its L2 isolation works.
|
||||
|
||||
Overview
|
||||
========
|
||||
Ryu provides REST API by which Quantum server tells necessary informations.
|
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Quantum Server manages the association networks(uuid) to actual key value in
|
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addition to normal Quantum management informations.
|
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(Here key value is an integer for VLAN ID, GRE key and so on.
|
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The quantum only have to know the range of key which depends on the isolation
|
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technology. For example, 12 bit in VLAN case, 24 bit in GRE case.)
|
||||
Quantum Ryu plugin doesn't know about what technology Ryu uses for L2
|
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isolation.
|
||||
|
||||
.. image:: /images/internal-quantum-overview.png
|
||||
|
||||
Quantum doesn't necessarily knows all the informations Ryu needs like
|
||||
mac address attached to the interface. Ryu can gather those informations
|
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by accessing directly to OVSDB. When tunnel ports on OVS needs to be created
|
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on compute-node, Ryu will directly accesses to OVSDB and creates/deletes
|
||||
ports.
|
||||
|
||||
|
||||
Cooperate with Openstack Quantum
|
||||
================================
|
||||
Ryu reacts to Qauntnum events, compute-node boots up, network
|
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creation/deletion, and VM instance creation/deletion.
|
||||
When VM instance is created, corresponding quantum port is created.
|
||||
|
||||
compute-node boot up
|
||||
--------------------
|
||||
When a compute note boots up, minimal initalization work is done by
|
||||
Ryu-quantum-agent which tell necessary informations to Ryu.
|
||||
Then Ryu set up OVS such that OVS connects to Ryu via OpenFlow.
|
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There are 2 steps of OVS initialization. By agent and by Ryu.
|
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This is to keep Ryu agent logic minimal and independent from what actual Ryu
|
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needs to set. Even if Ryu is enhanced for new feature and some additional
|
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configuration to OVS is needed (for example multi-controller for HA),
|
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ryu agent doesn't need to be modified due to 2 step initialization.
|
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|
||||
.. image:: /images/internal-quantum-bootup.png
|
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|
||||
network creation
|
||||
----------------
|
||||
When network is created, quantum Ryu plugin assigns Key value to
|
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a created network, and tell the association to Ryu
|
||||
|
||||
.. image:: /images/internal-quantum-network-creation.png
|
||||
|
||||
VM instance creation
|
||||
--------------------
|
||||
When VM instance is created, quantum port is created. Quantum Ryu
|
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plugin tells the association of (network uuid, port uuid) to Ryu, and
|
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then OVS port is created. Ryu finds the port creation via OpenFlow
|
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and get the information of the created port for (port uuid, attached
|
||||
mac address) via OVSDB protocoal, and then sets up network
|
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configuration to OVS.
|
||||
|
||||
.. image:: /images/internal-quantum-instance-create.png
|
||||
|
||||
quantum_adapater RyuApp
|
||||
-----------------------
|
||||
This application watches port creation/deletion by OF protocol.
|
||||
When it detects the creation of ports, it tries to retrieve related
|
||||
informations(port uuid, mac address) by OVSDB protocol,
|
||||
tries to determine if the port corresponds to Qauntnum VM port, and then
|
||||
stores those informations into the in-memory, which generates the event of
|
||||
VMPort creation. Then Ryu app of isolation (simple_vlan or gre_tunnel)
|
||||
will be notified.
|
||||
|
||||
live-migration
|
||||
--------------
|
||||
live-migration is popular feature with virtualization, so as OpenStack.
|
||||
As of this writing, there is no hooks in quantum. So no notification/callback
|
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are triggered when live-migration starts/on-going/ends/error-abort.
|
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Traditional live-migration uses GARP to tell switches the used mac address
|
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is moved.
|
||||
|
||||
.. image:: /images/internal-live-migration.png
|
||||
|
||||
VLAN
|
||||
====
|
||||
OVS supports port vlan with setting tag value in OVSDB.
|
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Ryu utilizes it for L2 isolation.
|
||||
|
||||
simple_vlan RyuApp
|
||||
------------------
|
||||
When port is created, it sets tag value to key assigned to a given network uuid.
|
||||
And sets flow entry to output:normal.
|
||||
|
||||
live-migration
|
||||
--------------
|
||||
As flows includes output:normal action, packets are processed by
|
||||
OVS builtin mac-learning.
|
||||
|
||||
#. When destination VM port is created, same rule is inserted on OVS
|
||||
on the destination.
|
||||
But the port on the destination is not used until the first GARP packet
|
||||
is sent
|
||||
#. When VM is resumed on the destination, a GARP packet is sent.
|
||||
Then, mac learning tables on each switch are updated.
|
||||
So the port on the source will be unused.
|
||||
#. When the VM on the source is destroyed, the port on the source is also
|
||||
destroyed.
|
||||
|
||||
|
||||
GRE tunneling
|
||||
=============
|
||||
OVS supports tunneling and Ryu utilizes it for L2 isolation as follows.
|
||||
|
||||
.. image:: /images/internal-gre-tunnel.png
|
||||
|
||||
tunnel_port_updator RyuApp
|
||||
--------------------------
|
||||
This application watches the VM port creation/deletion, and creates/deletes
|
||||
tunnel port on OVS when necessary.
|
||||
That is, it creates tunnel port between compute-nodes which have VMs of same
|
||||
tenant. it deletes tunnel ports when compute-nodes have no VMs of same
|
||||
tenant.
|
||||
|
||||
gre_tunnel RyuApp
|
||||
-----------------
|
||||
This application watches VM/tunnel port creation/deletion, and
|
||||
installs/removes flow entries based on port creation/deletion.
|
||||
|
||||
Flow Entries
|
||||
------------
|
||||
Ryu installs following flow entries.
|
||||
|
||||
.. image:: /images/internal-quantum-gre-flow-table.png
|
||||
|
||||
live-migration
|
||||
--------------
|
||||
As flows are aware of mac address of each ports, Ryu updates flow table
|
||||
for live-migration on each compute-nodes.
|
||||
When the port of same mac address is added on another compute-node,
|
||||
Ryu installs flows that duplicates packet so that packets destined to
|
||||
the mac address will be duplicated and sent to both ports.
|
||||
GARP from hypervisor isn't used.
|
||||
|
||||
.. image:: /images/internal-tunnel-live-migration-before.png
|
||||
.. image:: /images/internal-tunnel-live-migration-during.png
|
||||
.. image:: /images/internal-tunnel-live-migration-after.png
|
||||
|
||||
Mac address based L2 isolation
|
||||
==============================
|
||||
Ryu also supports mac address based L2 isolation.
|
||||
In this case key isn't used.
|
||||
|
||||
mac learing
|
||||
-----------
|
||||
When VM sends packets, Ryu determins network uuid from OVS port and then
|
||||
associates src mac address to network uuid.
|
||||
|
||||
.. image:: /images/mac-learning.png
|
||||
|
||||
|
||||
packet filtering(L2 unicast case)
|
||||
---------------------------------
|
||||
* When VM sending L2-unicast packet, Ryu checks if the destination mac
|
||||
address belongs to the same netowrk id of the source mac address which
|
||||
is same to the network uuid that the OVS port is associated to.
|
||||
* If no, the packet is dropped.
|
||||
* If yes, send the packet is sent to ports which belongs to the same
|
||||
network uuid and external port.
|
||||
|
||||
.. image:: /images/filtering-outgoing.png
|
||||
.. image:: /images/filtering-incoming.png
|
||||
|
||||
|
||||
packet filtering(L2 broadcast case)
|
||||
-----------------------------------
|
||||
* When VM sending L2-broadcast/multicaset packet, Ryu checks if the source
|
||||
mac address.
|
||||
* send the packet to all external ports and all OVS ports that belongs
|
||||
to the same network uuid of the source mac address.
|
||||
* When receiving broacast/multicast packet from the external ports,
|
||||
Ryu checks if the source mac address belongs to known network uuid.
|
||||
|
||||
* If yes, send the packet to the external ports except incoming one
|
||||
and the all OVS ports that belongs to the network uuid
|
||||
* if no, drop the packet.
|
||||
|
||||
.. image:: /images/filtering-broadcast.png
|
||||
|
||||
live-migration
|
||||
--------------
|
||||
As of this writing, simple isolation doesn't support live-migration.
|
@ -9,4 +9,4 @@ Ryu provides tenant isolation feature in OpenStack.
|
||||
|
||||
using_with_openstack.rst
|
||||
step_by_step.rst
|
||||
how_l2_segregation_works.rst
|
||||
internals_l2_isolation.rst
|
||||
|