安装 openVSwitch:注意这里的三个软件都要安装，openstack除了用ovs还要用到系统的brcompat
apt-get install openvswitch-switchopenvswitch-brcompat openvswitch-datapath-dkms
设置 ovs-brcompatd 启动：
sed -i 's/# BRCOMPAT=no/BRCOMPAT=yes/g'/etc/default/openvswitch-switch
启动 openvswitch-switch:
# service openvswitch-switch restart
*Killing ovs-brcompatd (1327)
*Killing ovs-vswitchd (1195)
*Killing ovsdb-server (1185)
*Starting ovsdb-server
*Configuring Open vSwitch system IDs
*Starting ovs-vswitchd
2013-10-29T02:45:50Z|00001|brcompatd|WARN|Bridgecompatibility is deprecated and may be removed no earlier than February 2013
*Starting ovs-brcompatd
直到 ovs-brcompatd、ovs-vswitchd、ovsdb-server等服务都启动
并检查brcompat模块
# lsmod | grep brcompat
brcompat 13512 0
openvswitch 84038 7 brcompat
如果还是启动不了 brcompat，执行下面命令：
/etc/init.d/openvswitch-switchforce-reload-kmod
再不行重启服务器，Ubuntu13.04（64位）一般安装上面3个软件都可以成功启动，不需其他额外操作。
创建br-int 网桥
ovs-vsctl add-br br-int
4.5. Quantum
安装 Quantum openvswitch agent:
apt-get install quantum-plugin-openvswitch-agent
编辑 OVS 插件配置文件 /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini:
root@c03:~# cat/etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini |grep -v ^# |grep -v ^$
[DATABASE]
sql_connection =mysql://quantum:quantum@10.10.10.51/quantum
reconnect_interval = 2
[OVS]
tenant_network_type = gre
tunnel_id_ranges = 1:1000
local_ip = 10.20.20.55
enable_tunneling = True
[AGENT]
polling_interval = 2
[SECURITYGROUP]
firewall_driver = quantum.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
编辑 /etc/quantum/quantum.conf：
root@c03:~# cat/etc/quantum/quantum.conf|grep -v ^# |grep -v ^$
[DEFAULT]
verbose = True
lock_path = $state_path/lock
bind_host = 0.0.0.0
bind_port = 9696
core_plugin =quantum.plugins.openvswitch.ovs_quantum_plugin.OVSQuantumPluginV2
api_paste_config =/etc/quantum/api-paste.ini
control_exchange = quantum
fake_rabbit = False
rabbit_host = 10.10.10.51
rabbit_password = guest
notification_driver = quantum.openstack.common.notifier.rpc_notifier
default_notification_level = INFO
notification_topics = notifications
[QUOTAS]
[DEFAULT_SERVICETYPE]
[AGENT]
root_helper = sudo quantum-rootwrap/etc/quantum/rootwrap.conf
[keystone_authtoken]
auth_host = 10.10.10.51
auth_port = 35357
auth_protocol = http
admin_tenant_name = service
admin_user = quantum
admin_password = 123456
signing_dir =/var/lib/quantum/keystone-signing
启动服务：
service quantum-plugin-openvswitch-agentrestart
安装其他软件：
如果instance要想成功attach cinder所建立的volume，还需要安装一些铺助软件，这个在官网的排错中有提到，一般地方找不到（由于系统是最小化安装了，mysql-cient都没安上）
libsysfs2_2.1.0+repack-2_amd64.deb multipath-tools_0.4.9-3ubuntu7_amd64.deb sg3-utils_1.33-1build1_amd64.deb
mysql-client-core-5.5_5.5.32-0ubuntu0.13.04.1_amd64.deb sysfsutils_2.1.0+repack-2_amd64.deb