=========================================================================================
README: A Quantum Plugin Framework for Supporting L2 Networks Spannning Multiple Switches
=========================================================================================
:Author: Sumit Naiksatam, Ram Durairaj, Mark Voelker, Edgar Magana, Shweta Padubidri,
Rohit Agarwalla, Ying Liu, Debo Dutta
:Contact: netstack@lists.launchpad.net
:Web site: https://launchpad.net/~cisco-openstack
:Copyright: 2011 Cisco Systems, Inc.
.. contents::
Introduction
------------
This plugin implementation provides the following capabilities
to help you take your Layer 2 network for a Quantum leap:
* A reference implementation for a Quantum Plugin Framework
(For details see: http://wiki.openstack.org/quantum-multi-switch-plugin)
* Supports multiple switches in the network
* Supports multiple models of switches concurrently
* Supports use of multiple L2 technologies
* Supports Cisco UCS blade servers with M81KR Virtual Interface Cards
(aka "Palo adapters") via 802.1Qbh.
* Supports the Cisco Nexus family of switches.
It does not provide:
* A hologram of Al that only you can see.
* A map to help you find your way through time.
* A cure for amnesia or your swiss-cheesed brain.
Let's leap in!
Pre-requisites
--------------
(The following are necessary only when using the UCS and/or Nexus devices in your system.
If you plan to just leverage the plugin framework, you do not need these.)
* One or more UCS B200 series blade servers with M81KR VIC (aka
Palo adapters) installed.
* UCSM 2.0 (Capitola) Build 230 or above.
* OpenStack Diablo D3 or later (should have VIF-driver support)
* RHEL 6.1 (as of this writing, UCS only officially supports RHEL, but
it should be noted that Ubuntu support is planned in coming releases as well)
** Package: python-configobj-4.6.0-3.el6.noarch (or newer)
** Package: python-routes-1.12.3-2.el6.noarch (or newer)
If you are using a Nexus switch in your topology, you'll need the following
NX-OS version and packages to enable Nexus support:
* NX-OS 5.2.1 (Delhi) Build 69 or above.
* paramiko library - SSHv2 protocol library for python
** To install on RHEL 6.1, run: yum install python-paramiko
* ncclient v0.3.1 - Python library for NETCONF clients
** You need a version of ncclient modifed by Cisco Systems.
To get it, from your shell prompt do:
git clone git@github.com:CiscoSystems/ncclient.git
sudo python ./setup.py install
** For more information of ncclient, see:
http://schmizz.net/ncclient/
To verify the version of any package you have installed on your system,
run "rpm -qav | grep <package name>", where <package name> is the
package you want to query (for example: python-routes).
Note that you can get access to recent versions of the packages above
and other OpenStack software packages by adding a new repository to
your yum configuration. To do so, edit or create
/etc/yum.repos.d/openstack.repo and add the following:
[openstack-deps]
name=OpenStack Nova Compute Dependencies
baseurl=http://yum.griddynamics.net/yum/cactus/deps
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OPENSTACK
Then run "yum install python-routes".
Module Structure:
-----------------
* quantum/plugins/cisco/ - Contains the L2-Network Plugin Framework
/client - CLI module for core and extensions API
/common - Modules common to the entire plugin
/conf - All configuration files
/db - Persistence framework
/models - Class(es) which tie the logical abstractions
to the physical topology
/nova - Scheduler and VIF-driver to be used by Nova
/nexus - Nexus-specific modules
/segmentation - Implementation of segmentation manager,
e.g. VLAN Manager
/tests - Tests specific to this plugin
/ucs - UCS-specific modules
Plugin Installation Instructions
----------------------------------
1. Make a backup copy of quantum/quantum/plugins.ini.
2. Edit quantum/quantum/plugins.ini and edit the "provider" entry to point
to the L2Network-plugin:
provider = quantum.plugins.cisco.l2network_plugin.L2Network
3. Configure your OpenStack installation to use the 802.1qbh VIF driver and
Quantum-aware scheduler by editing the /etc/nova/nova.conf file with the
following entries:
--scheduler_driver=quantum.plugins.cisco.nova.quantum_port_aware_scheduler.QuantumPortAwareScheduler
--quantum_host=127.0.0.1
--quantum_port=9696
--libvirt_vif_driver=quantum.plugins.cisco.nova.vifdirect.Libvirt802dot1QbhDriver
--libvirt_vif_type=802.1Qbh
Note: To be able to bring up a VM on a UCS blade, you should first create a
port for that VM using the Quantum create port API. VM creation will
fail if an unused port is not available. If you have configured your
Nova project with more than one network, Nova will attempt to instantiate
the VM with one network interface (VIF) per configured network. To provide
plugin points for each of these VIFs, you will need to create multiple
Quantum ports, one for each of the networks, prior to starting the VM.
However, in this case you will need to use the Cisco multiport extension
API instead of the Quantum create port API. More details on using the
multiport extension follow in the section on multi NIC support.
4. To support the above configuration, you will need some Quantum modules. It's easiest
to copy the entire quantum directory from your quantum installation into:
/usr/lib/python2.6/site-packages/
This needs to be done for each nova compute node.
5. If you want to turn on support for Cisco Nexus switches:
5a. Uncomment the nexus_plugin property in
quantum/plugins/cisco/conf/plugins.ini to read:
nexus_plugin=quantum.plugins.cisco.nexus.cisco_nexus_plugin.NexusPlugin
5b. Enter the relevant configuration in the
quantum/plugins/cisco/conf/nexus.ini file. Example:
[SWITCH]
# Change the following to reflect the IP address of the Nexus switch.
# This will be the address at which Quantum sends and receives configuration
# information via SSHv2.
nexus_ip_address=10.0.0.1
# Port numbers on the Nexus switch to each one of the UCSM 6120s is connected
# Use shortened interface syntax, e.g. "1/10" not "Ethernet1/10".
nexus_first_port=1/10
nexus_second_port=1/11
#Port number where SSH will be running on the Nexus switch. Typically this is 22
#unless you've configured your switch otherwise.
nexus_ssh_port=22
[DRIVER]
name=quantum.plugins.cisco.nexus.cisco_nexus_network_driver.CiscoNEXUSDriver
5c. Make sure that SSH host key of the Nexus switch is known to the
host on which you are running the Quantum service. You can do
this simply by logging in to your Quantum host as the user that
Quantum runs as and SSHing to the switch at least once. If the
host key changes (e.g. due to replacement of the supervisor or
clearing of the SSH config on the switch), you may need to repeat
this step and remove the old hostkey from ~/.ssh/known_hosts.
6. Plugin Persistence framework setup:
6a. Create quantum_l2network database in mysql with the following command -
mysql -u<mysqlusername> -p<mysqlpassword> -e "create database quantum_l2network"
6b. Enter the quantum_l2network database configuration info in the
quantum/plugins/cisco/conf/db_conn.ini file.
6c. If there is a change in the plugin configuration, service would need
to be restarted after dropping and re-creating the database using
the following commands -
mysql -u<mysqlusername> -p<mysqlpassword> -e "drop database quantum_l2network"
mysql -u<mysqlusername> -p<mysqlpassword> -e "create database quantum_l2network"
7. Verify that you have the correct credentials for each IP address listed
in quantum/plugins/cisco/conf/credentials.ini. Example:
# Provide the UCSM credentials, create a separte entry for each UCSM used in your system
# UCSM IP address, username and password.
[10.0.0.2]
username=admin
password=mySecretPasswordForUCSM
# Provide the Nexus credentials, if you are using Nexus switches.
# If not this will be ignored.
[10.0.0.1]
username=admin
password=mySecretPasswordForNexus
In general, make sure that every UCSM and Nexus switch used in your system,
has a credential entry in the above file. This is required for the system to
be able to communicate with those switches.
8. Configure the UCS systems' information in your deployment by editing the
quantum/plugins/cisco/conf/ucs_inventory.ini file. You can configure multiple
UCSMs per deployment, multiple chassis per UCSM, and multiple blades per
chassis. Chassis ID and blade ID can be obtained from the UCSM (they will
typically be numbers like 1, 2, 3, etc.). Also make sure that you put the exact
hostname as nova sees it (the host column in the services table of the nova
DB will give you that information).
[ucsm-1]
ip_address = <put_ucsm_ip_address_here>
[[chassis-1]]
chassis_id = <put_the_chassis_id_here>
[[[blade-1]]]
blade_id = <put_blade_id_here>
host_name = <put_hostname_here>
[[[blade-2]]]
blade_id = <put_blade_id_here>
host_name = <put_hostname_here>
[[[blade-3]]]
blade_id = <put_blade_id_here>
host_name = <put_hostname_here>
[ucsm-2]
ip_address = <put_ucsm_ip_address_here>
[[chassis-1]]
chassis_id = <put_the_chassis_id_here>
[[[blade-1]]]
blade_id = <put_blade_id_here>
host_name = <put_hostname_here>
[[[blade-2]]]
blade_id = <put_blade_id_here>
host_name = <put_hostname_here>
9. Start the Quantum service. If something doesn't work, verify that
your configuration of each of the above files hasn't gone a little kaka.
Once you've put right what once went wrong, leap on.
Multi NIC support for VMs
-------------------------
As indicated earlier, if your Nova setup has a project with more than one network,
Nova will try to create a virtual network interface (VIF) on the VM for each of those
networks. That implies -
(1) You should create the same number of networks in Quantum as in your Nova
project.
(2) Before each VM is instantiated, you should create Quantum ports on each of those
networks. These ports need to be created using the following rest call:
POST /v1.0/extensions/csco/tenants/{tenant_id}/multiport/
with request body:
{'multiport':
{'status': 'ACTIVE',
'net_id_list': net_id_list,
'ports_desc': {'key': 'value'}}}
where,
net_id_list is a list of network IDs: [netid1, netid2, ...]. The "ports_desc" dictionary
is reserved for later use. For now, the same structure in terms of the dictionary name, key
and value should be used.
The corresponding CLI for this operation is as follows:
PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py create_multiport <tenant_id> <net_id1,net_id2,...>
(Note that you should not be using the create port core API in the above case.)
Using the Command Line Client to work with this Plugin
------------------------------------------------------
A command line client is packaged with this plugin. This module can be used
to invoke the core API as well as the extensions API, so that you don't have
to switch between different CLI modules (it internally invokes the Quantum
CLI module for the core APIs to ensure consistency when using either). This
command line client can be invoked as follows:
PYTHONPATH=.:tools python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py
1. Creating the network
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py create_net -H 10.10.2.6 demo net1
Created a new Virtual Network with ID: c4a2bea7-a528-4caf-b16e-80397cd1663a
for Tenant demo
2. Listing the networks
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py list_nets -H 10.10.2.6 demo
Virtual Networks for Tenant demo
Network ID: 0e85e924-6ef6-40c1-9f7a-3520ac6888b3
Network ID: c4a2bea7-a528-4caf-b16e-80397cd1663a
3. Creating one port on each of the networks
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py create_multiport -H 10.10.2.6 demo c4a2bea7-a528-4caf-b16e-80397cd1663a,0e85e924-6ef6-40c1-9f7a-3520ac6888b3
Created ports: {u'ports': [{u'id': u'118ac473-294d-480e-8f6d-425acbbe81ae'}, {u'id': u'996e84b8-2ed3-40cf-be75-de17ff1214c4'}]}
4. List all the ports on a network
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py list_ports -H 10.10.2.6 demo c4a2bea7-a528-4caf-b16e-80397cd1663a
Ports on Virtual Network: c4a2bea7-a528-4caf-b16e-80397cd1663a
for Tenant: demo
Logical Port: 118ac473-294d-480e-8f6d-425acbbe81ae
5. Show the details of a port
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py show_port -H 10.10.2.6 demo c4a2bea7-a528-4caf-b16e-80397cd1663a 118ac473-294d-480e-8f6d-425acbbe81ae
Logical Port ID: 118ac473-294d-480e-8f6d-425acbbe81ae
administrative State: ACTIVE
interface: <none>
on Virtual Network: c4a2bea7-a528-4caf-b16e-80397cd1663a
for Tenant: demo
6. Start the VM instance using Nova
Note that when using UCS and the 802.1Qbh features, the association of the
VIF-ID (also referred to as interface ID) on the VM's NIC with a port will
happen automatically when the VM is instantiated. At this point, doing a
show_port will reveal the VIF-ID associated with the port. To indicate that
this VIF-ID is still detached from the network it would eventually be on, you
will see the suffix "(detached)" on the VIF-ID. This indicates that although
the VIF-ID and the port have been associated, the VIF still does not have
connectivity to the network on which the port resides. That connectivity
will be established only after the plug/attach operation is performed (as
described in the next step).
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py show_port demo c4a2bea7-a528-4caf-b16e-80397cd1663a 118ac473-294d-480e-8f6d-425acbbe81ae
Logical Port ID: 118ac473-294d-480e-8f6d-425acbbe81ae
administrative State: ACTIVE
interface: b73e3585-d074-4379-8dde-931c0fc4db0e(detached)
on Virtual Network: c4a2bea7-a528-4caf-b16e-80397cd1663a
for Tenant: demo
7. Plug interface and port into the network
Use the interface information obtained in step 6 to plug the interface into
the network.
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py plug_iface demo c4a2bea7-a528-4caf-b16e-80397cd1663a 118ac473-294d-480e-8f6d-425acbbe81ae b73e3585-d074-4379-8dde-931c0fc4db0e
Plugged interface b73e3585-d074-4379-8dde-931c0fc4db0e
into Logical Port: 118ac473-294d-480e-8f6d-425acbbe81ae
on Virtual Network: c4a2bea7-a528-4caf-b16e-80397cd1663a
for Tenant: demo
8. Unplug an interface and port from the network
# PYTHONPATH=. python plugins/cisco-plugin/lib/quantum/plugins/cisco/client/cli.py unplug_iface demo c4a2bea7-a528-4caf-b16e-80397cd1663a 118ac473-294d-480e-8f6d-425acbbe81ae
Unplugged interface from Logical Port: 118ac473-294d-480e-8f6d-425acbbe81ae
on Virtual Network: c4a2bea7-a528-4caf-b16e-80397cd1663a
for Tenant: demo
Note: After unplugging, if you check the details of the port, you will
see the VIF-IF associated with the port (but now suffixed with the state
"detached"). At this point, it is possible to plug the VIF into the network
again making use of the same VIF-ID. In general, once associated, the VIF-ID
cannot be disassociated with the port until the VM is terminated. After the
VM is terminated, the VIF-ID will be automatically disassociated from the
port. To summarize, association and disassociation of the VIF-ID with a port
happens automatically at the time of creating and terminating the VM. The
connectivity of the VIF to the network is controlled by the user via the
plug and unplug operations.
How to test the installation
----------------------------
The unit tests are located at quantum/plugins/cisco/tests/unit. They can be
executed from the main folder using the run_tests.sh or to get a more detailed
result the run_tests.py script.
1. All unit tests (needs environment setup as indicated in the pre-requisites):
./run_tests.sh -N quantum.plugins.cisco.tests.unit
or by modifying the environment variable to point to the plugin directory
In bash : export PLUGIN_DIR=quantum/plugins/cisco
tcsh/csh : setenv PLUGIN_DIR quantum/plugins/cisco
./run_tests.sh -N
Another option is to execute the python script run_tests.py
python run_tests.py quantum.plugins.cisco.tests.unit
2. Testing the core API (without UCS/Nexus/RHEL hardware, and can be run on
Ubuntu):
Device-specific plugins can be disabled by commenting out the entries in:
etc/quantum/plugins/cisco/cisco_plugins.ini
The Core API can be tested by initially disabling all device plugins, then
enabling just the UCS plugins, and finally enabling both the UCS and the
Nexus plugins.
Execute the test script as follows:
./run_tests.sh -N quantum.plugins.cisco.tests.unit.test_l2networkApi
or
python run_tests.py quantum.plugins.cisco.tests.unit.test_l2networkApi
3. Specific Plugin unit test (needs environment setup as indicated in the
pre-requisites):
./run_tests.sh -N quantum.plugins.cisco.tests.unit.<name_of_the_module>
or
python run_tests.py quantum.plugins.cisco.tests.unit.<name_of_the_module>
E.g.:
python run_tests.py quantum.plugins.cisco.tests.unit.test_ucs_plugin
To run specific tests, use the following:
python run_tests.py
quantum.plugins.cisco.tests.unit.<name_of_the_module>:<ClassName>.<funcName>
Eg:
python run_tests.py
quantum.plugins.cisco.tests.unit.test_ucs_plugin:UCSVICTestPlugin.test_create_port
4. Testing the Extension API
The script is placed alongwith the other cisco unit tests. The location may
change later.
Location quantum/plugins/cisco/tests/unit/test_cisco_extension.py
The script can be executed by :
./run_tests.sh -N quantum.plugins.cisco.tests.unit.test_cisco_extension
or
python run_tests.py quantum.plugins.cisco.tests.unit.test_cisco_extension
Bingo bango bongo! That's it! Thanks for taking the leap into Quantum.
...Oh, boy!
