Ubuntu14.04安装配置Open vSwitch

最近在研究学习Open vSwitch，准备在本地Ubuntu14.04机器上安装一下，并基于其创建一些KVM虚拟机，下面就简要记录下在Ubuntu14.04系统上安装Open vSwitch的过程。

1、由于之前安装过KVM，其在本机生成了一个名为virbr0的bridge，这里我们需要事先将其删除，否则可能会与Open vSwitch产生不兼容的问题，命令如下：

◄►  virsh net-destroy default
Network default destroyed

◄►  virsh net-autostart --disable default
Network default unmarked as autostarted

2、这里我们同样也不需要bridge模块：

◄►  sudo aptitude purge ebtables
The following packages will be REMOVED:
  ebtables{p}
 packages upgraded,  newly installed,  to remove and  not upgraded.
Need to get  B of archives. After unpacking  kB will be freed.
Do you want to continue? [Y/n/?] y
(Reading database ...  files and directories currently installed.)
Removing ebtables (2.0.10.4-3ubuntu1) ...
 * Clearing ebtables rulesets                                                                                                                   [ OK ]
Purging configuration files for ebtables (2.0.10.4-3ubuntu1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...

3、下面开始安装openvswitch相关包：

◄►  sudo apt-get install openvswitch-switch

4、查看下ovs的运行状况：

◄►  ps -ea | grep ovs
 ?        :: ovsdb-server
 ?        :: ovs-vswitchd

5、查看下安装的ovs的版本：

◄►  ovs-appctl --version
ovs-appctl (Open vSwitch) 2.0.
Compiled May   ::

6、查看下当前ovs支持的OpenFlow协议的版本：

◄►  ovs-ofctl --version
ovs-ofctl (Open vSwitch) 2.0.
Compiled May   ::
OpenFlow versions 0x1:0x4

7、通过ovs创建一个网桥 br0，供kvm虚拟机使用：

◄►  sudo ovs-vsctl add-br br0
◄►  ifconfig
br0       Link encap:Ethernet  HWaddr ::fd::e5:4b
          inet6 addr: fe80::4c0a:7bff:fec6:98d7/ Scope:Link
          UP BROADCAST RUNNING  MTU:  Metric:
          RX packets: errors: dropped: overruns: frame:
          TX packets: errors: dropped: overruns: carrier:
          collisions: txqueuelen:
          RX bytes: (0.0 B)  TX bytes: (578.0 B)

通过ifconfig命令，我们发现多了一个br0网桥。

8、将物理网卡eth0添加到br0上：

◄►  sudo ovs-vsctl add-port br0 eth0

这步执行后，发现无法再访问外网，不过没关系，我们可以按照如下步骤解决：

1）先清除eth0的配置：

◄►  sudo ifconfig eth0 

2）让br0自动获取ip地址：

◄►  sudo dhclient br0

3）此时就又可以通外网了：

◄►  ping www.baidu.com
PING www.a.shifen.com (119.75.217.109) () bytes of data.
 bytes from 119.75.217.109: icmp_seq= ttl= time=30.9 ms
 bytes from 119.75.217.109: icmp_seq= ttl= time=31.9 ms

9、最后查看下目前br0和eth0的情况：

◄►  sudo ovs-vsctl show
1e6548a9-956e-4b86-b743-f8da0aa2b922
    Bridge "br0"
        Port "br0"
            Interface "br0"
                type: internal
        Port "eth0"
            Interface "eth0"
    ovs_version: "2.0.2"