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OpenStack Mitaka : Configure Neutron#1 (Control Node)2016/04/28
 
Configure OpenStack Network Service (Neutron).
For this example, Install Neutron Server on Control Node which Keystone/Glance/Nova API are already installed, and Install DHCP Agent, L3 Agent, L2 Agent, Metadata Agent on Network Node, and also Install L2 Agent on Compute Node on here. ( it's possible to install on a server as All-in-One, though, if you want )
Neutron needs a plugin software, it's possible to choose it from some softwares. This example chooses ML2 plugin. ( it uses Open vSwitch under the backend ) 
                                |
+------------------+            |            +------------------------+
| [ Control Node ] |            |            |    [ Network Node ]    |
|     Keystone     |10.0.0.30   |   10.0.0.50|        DHCP Agent      |
|      Glance      |------------+------------|        L3 Agent        |
|     Nova API     |eth0        |        eth0|        L2 Agent        |
|  Neutron Server  |            |            |     Metadata Agent     |
+------------------+            |            +------------------------+
                            eth0|10.0.0.51
                      +--------------------+
                      |  [ Compute Node ]  |
                      |    Nova Compute    |
                      |      L2 Agent      |
                      +--------------------+
 
Configure Control Node on here.
[1] Add user or service for Neutron on Keystone Server.
# add neutron user (set in service project)

[root@dlp ~(keystone)]#
openstack user create --domain default --project service --password servicepassword neutron 

+--------------------+----------------------------------+
| Field              | Value                            |
+--------------------+----------------------------------+
| default_project_id | 0eb5f28ee57743c2a56c049caa97b7d2 |
| domain_id          | 25abd10294da4cb28aee485cd9587b87 |
| enabled            | True                             |
| id                 | 597ad07bd8cc4f37b0f12ce330264e87 |
| name               | neutron                          |
+--------------------+----------------------------------+
# add neutron user in admin role

[root@dlp ~(keystone)]#
openstack role add --project service --user neutron admin
# add service entry for neutron

[root@dlp ~(keystone)]#
openstack service create --name neutron --description "OpenStack Networking service" network 

+-------------+----------------------------------+
| Field       | Value                            |
+-------------+----------------------------------+
| description | OpenStack Networking service     |
| enabled     | True                             |
| id          | 17ffb74056d44a2b925b75286cde686c |
| name        | neutron                          |
| type        | network                          |
+-------------+----------------------------------+
# define keystone host

[root@dlp ~(keystone)]#
export controller=10.0.0.30
# add endpoint for neutron (public)

[root@dlp ~(keystone)]#
openstack endpoint create --region RegionOne network public http://$controller:9696 

+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | 0b3f78de177b4ea291d3d992c8c917c7 |
| interface    | public                           |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 17ffb74056d44a2b925b75286cde686c |
| service_name | neutron                          |
| service_type | network                          |
| url          | http://10.0.0.30:9696            |
+--------------+----------------------------------+
# add endpoint for neutron (internal)

[root@dlp ~(keystone)]#
openstack endpoint create --region RegionOne network internal http://$controller:9696 

+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | dbe485f4014340599af2bb8b66d8f3fe |
| interface    | internal                         |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 17ffb74056d44a2b925b75286cde686c |
| service_name | neutron                          |
| service_type | network                          |
| url          | http://10.0.0.30:9696            |
+--------------+----------------------------------+
# add endpoint for neutron (admin)

[root@dlp ~(keystone)]#
openstack endpoint create --region RegionOne network admin http://$controller:9696 

+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | 5bf5928e53604cb194e4e84cf5c85343 |
| interface    | admin                            |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 17ffb74056d44a2b925b75286cde686c |
| service_name | neutron                          |
| service_type | network                          |
| url          | http://10.0.0.30:9696            |
+--------------+----------------------------------+
[2] Add a User and Database on MariaDB for Neutron.
[root@dlp ~(keystone)]#
mysql -u root -p 

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 18
Server version: 5.5.47-MariaDB MariaDB Server

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
create database neutron_ml2;

Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]>
grant all privileges on neutron_ml2.* to neutron@'localhost' identified by 'password';

Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]>
grant all privileges on neutron_ml2.* to neutron@'%' identified by 'password';

Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]>
flush privileges;

Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]>
exit

Bye
[3] Install Neutron Server.
# install from Mitaka, EPEL

[root@dlp ~(keystone)]#
yum --enablerepo=centos-openstack-mitaka,epel -y install openstack-neutron openstack-neutron-ml2
[4] Configure Neutron Server.
[root@dlp ~(keystone)]#
mv /etc/neutron/neutron.conf /etc/neutron/neutron.conf.org

[root@dlp ~(keystone)]#
vi /etc/neutron/neutron.conf
# create new

[DEFAULT]
core_plugin = ml2
service_plugins = router
auth_strategy = keystone
state_path = /var/lib/neutron
dhcp_agent_notification = True
allow_overlapping_ips = True
notify_nova_on_port_status_changes = True
notify_nova_on_port_data_changes = True
rpc_backend = rabbit

[agent]
root_helper = sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf

# Keystone auth info
[keystone_authtoken]
auth_uri = http://10.0.0.30:5000
auth_url = http://10.0.0.30:35357
memcached_servers = 10.0.0.30:11211
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = neutron
password = servicepassword

# MariaDB connection info
[database]
connection = mysql+pymysql://neutron:password@10.0.0.30/neutron_ml2

# Nova connection info
[nova]
auth_url = http://10.0.0.30:35357
auth_type = password
project_domain_name = default
user_domain_name = default
region_name = RegionOne
project_name = service
username = nova
password = servicepassword

[oslo_concurrency]
lock_path = $state_path/lock

# RabbitMQ connection info
[oslo_messaging_rabbit]
rabbit_host = 10.0.0.30
rabbit_port = 5672
rabbit_userid = openstack
rabbit_password = password
[root@dlp ~(keystone)]#
chmod 640 /etc/neutron/neutron.conf

[root@dlp ~(keystone)]#
chgrp neutron /etc/neutron/neutron.conf

[root@dlp ~(keystone)]#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# line 100: add ( it's OK with no value for "tenant_network_types" (set later if need) )

[ml2]
type_drivers = flat,vlan,gre,vxlan
tenant_network_types =
mechanism_drivers = openvswitch,l2population
extension_drivers = port_security
# line 233: uncomment & add

enable_security_group = True
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
# last line: uncomment

enable_ipset = True
[root@dlp ~(keystone)]#
vi /etc/nova/nova.conf
# add follows into [DEFAULT] section

use_neutron = True
linuxnet_interface_driver = nova.network.linux_net.LinuxOVSInterfaceDriver
firewall_driver = nova.virt.firewall.NoopFirewallDriver

# add follows to the end : Neutron auth info
[neutron]
url = http://10.0.0.30:9696
auth_url = http://10.0.0.30:35357
auth_type = password
project_domain_name = default
user_domain_name = default
region_name = RegionOne
project_name = service
username = neutron
password = servicepassword
[root@dlp ~(keystone)]#
ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

[root@dlp ~(keystone)]#
su -s /bin/bash neutron -c "neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugin.ini upgrade head"

[root@dlp ~(keystone)]#
systemctl start neutron-server

[root@dlp ~(keystone)]#
systemctl enable neutron-server

[root@dlp ~(keystone)]#
systemctl restart openstack-nova-api

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