- 1 OVS中的bridge
- OVS常用操作
- 使用OVS实现单网卡多网络平面
http://www.voidcn.com/article/p-ndfxasid-gr.html
https://blog.csdn.net/Moolight_shadow/article/details/52909986
https://blog.csdn.net/jiashanshan521/article/details/52266156
http://sdnhub.cn/index.php/openv-switch-full-guide/
https://blog.csdn.net/zengxiaosen/article/details/79083205
在 OVS 中, 有几个非常重要的概念：
- Bridge: Bridge 代表一个以太网交换机（Switch），一个主机中可以创建一个或者多个 Bridge 设备。
- Port: 端口与物理交换机的端口概念类似，每个 Port 都隶属于一个 Bridge。
- Interface: 连接到 Port 的网络接口设备。在通常情况下，Port 和 Interface 是一对一的关系, 只有在配置 Port 为 bond 模式后，Port 和 Interface 是一对多的关系。
注意: 网桥名字最好不要带"-"
1 OVS中的bridge
一个桥就是一个交换机。在OVS中，
ovs-vsctl add-br brname(br-int)
当我们创建了一个交换机（网桥）以后，此时网络功能不受影响，但是会产生一个虚拟网卡，名字就是brname，之所以会产生一个虚拟网卡，是为了实现接下来的网桥（交换机）功能。有了这个交换机以后，我还需要为这个交换机增加端口(port)，一个端口，就是一个物理网卡，当网卡加入到这个交换机之后，其工作方式就和普通交换机的一个端口的工作方式类似了。
ovs-vsctl add-port brname port
这里要特别注意，网卡加入网桥以后，要按照网桥的工作标准工作，那么加入的一个端口就必须是以混杂模式工作，工作在链路层，处理2层的帧，所以这个port就不需要配置IP了。（你没见过哪个交换的端口有IP的吧）
那么接下来你可能会问，通常的交换机不都是有一个管理接口，可以telnet到交换机上进行配置吧，那么在OVS中创建的虚拟交换机有木有这种呢，有的！上面既然创建交换机brname的时候产生了一个虚拟网口brname,那么，你给这个虚拟网卡配置了IP以后，就相当于给交换机的管理接口配置了IP，此时一个正常的虚拟交换机就搞定了。
ip address add 192.168.1.1/24 dev brname
最后查看一个br的具体信息
[root@compute1 ~]# ovs-vsctl show
b97e9aa2-620f-40ba-b2cd-2a5b6f46d824
Bridge "br1"
Port "patch-to-br1-brex"
Interface "patch-to-br1-brex"
type: patch
options: {peer="patch-to-br1"}
Port "br1"
Interface "br1"
type: internal
首先, 这里显示一个名为br1的桥(交换机), 这个交换机有两个接口, 一个是patch-to-br1-brex, 一个是"br1". 上面说到，创建桥的时候会创建一个和桥名字一样的接口，并自动作为该桥的一个端口，那么这个虚拟接口的作用，一方面是可以作为交换机的管理端口，另一方面也是基于这个虚拟接口，实现了桥的功能。
OVS常用操作
以下操作都需要root权限运行，在所有命令中br0表示网桥名称，eth0为网卡名称。
添加网桥：
#ovs-vsctl add-br br0
列出open vswitch中的所有网桥：
#ovs-vsctl list-br
判断网桥是否存在
#ovs-vsctl br-exists br0
将物理网卡挂接到网桥：
#ovs-vsctl add-port br0 eth0
列出网桥中的所有端口：
#ovs-vsctl list-ports br0
列出所有挂接到网卡的网桥：
#ovs-vsctl port-to-br eth0
查看open vswitch的网络状态：
#ovs-vsctl show
删除网桥上已经挂接的网口：
#vs-vsctl del-port br0 eth0
删除网桥：
#ovs-vsctl del-br br0
使用OVS实现单网卡多网络平面
首先, 安装openvswitch
yum install openvswitch
配置这个网卡的网桥使用, 记得备份哈
[root@controller124 ~]# cat /etc/sysconfig/network-scripts/ifcfg-br-ex
DEVICE=br-ex
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=10.121.2.124
NETMASK=255.255.255.0
GATEWAY=10.121.2.1
DNS1=114.114.114.114
ONBOOT=yes
[root@controller124 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp10s0f0
TYPE=OVSPort
DEVICETYPE=ovs
DEVICE=enp10s0f0
ONBOOT=yes
OVS_BRIDGE=br-ex
重启网络服务
systemctl restart network
然后使用分别创建网桥以及port连接
[root@controller124 ~]# ovs-vsctl add-br br1
[root@controller124 ~]# ovs-vsctl add-br br2
[root@controller124 ~]# ovs-vsctl add-br br3
[root@controller124 ~]# ovs-vsctl add-br br4
[root@controller124 ~]# ovs-vsctl list-br
br-ex
br1
br2
br3
br4
[root@controller124 ~]# ovs-vsctl add-port br-ex patch-to-br1
[root@controller124 ~]# ovs-vsctl set interface patch-to-br1 type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br1 options:peer=patch-to-br1-brex
[root@controller124 ~]# ovs-vsctl add-port br1 patch-to-br1-brex
[root@controller124 ~]# ovs-vsctl set interface patch-to-br1-brex type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br1-brex options:peer=patch-to-br1
[root@controller124 ~]#
[root@controller124 ~]#
[root@controller124 ~]# ovs-vsctl add-port br-ex patch-to-br2
[root@controller124 ~]# ovs-vsctl set interface patch-to-br2 type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br2 options:peer=patch-to-br2-brex
[root@controller124 ~]# ovs-vsctl add-port br2 patch-to-br2-brex
[root@controller124 ~]# ovs-vsctl set interface patch-to-br2-brex type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br2-brex options:peer=patch-to-br2
[root@controller124 ~]#
[root@controller124 ~]#
[root@controller124 ~]# ovs-vsctl add-port br-ex patch-to-br3
[root@controller124 ~]# ovs-vsctl set interface patch-to-br3 type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br3 options:peer=patch-to-br3-brex
[root@controller124 ~]# ovs-vsctl add-port br3 patch-to-br3-brex
[root@controller124 ~]# ovs-vsctl set interface patch-to-br3-brex type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br3-brex options:peer=patch-to-br3
[root@controller124 ~]#
[root@controller124 ~]#
[root@controller124 ~]# ovs-vsctl add-port br-ex patch-to-br4
[root@controller124 ~]# ovs-vsctl set interface patch-to-br4 type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br4 options:peer=patch-to-br4-brex
[root@controller124 ~]# ovs-vsctl add-port br4 patch-to-br4-brex
[root@controller124 ~]# ovs-vsctl set interface patch-to-br4-brex type=patch
[root@controller124 ~]# ovs-vsctl set interface patch-to-br4-brex options:peer=patch-to-br4
[root@controller ~]# ovs-vsctl show
baea5b51-90c4-4cc2-b764-34719a29e7ac
Bridge br-ex
Port "patch-to-br3"
Interface "patch-to-br3"
type: patch
options: {peer="patch-to-br3-brex"}
Port "patch-to-br2"
Interface "patch-to-br2"
type: patch
options: {peer="patch-to-br2-brex"}
Port "patch-to-br4"
Interface "patch-to-br4"
type: patch
options: {peer="patch-to-br4-brex"}
Port "patch-to-br1"
Interface "patch-to-br1"
type: patch
options: {peer="patch-to-br1-brex"}
Port br-ex
Interface br-ex
type: internal
Bridge "br1"
Port "br1"
Interface "br1"
type: internal
Port "patch-to-br1-brex"
Interface "patch-to-br1-brex"
type: patch
options: {peer="patch-to-br1"}
Bridge "br4"
Port "br4"
Interface "br4"
type: internal
Port "patch-to-br4-brex"
Interface "patch-to-br4-brex"
type: patch
options: {peer="patch-to-br4"}
Bridge "br2"
Port "patch-to-br2-brex"
Interface "patch-to-br2-brex"
type: patch
options: {peer="patch-to-br2"}
Port "br2"
Interface "br2"
type: internal
Bridge "br3"
Port "br3"
Interface "br3"
type: internal
Port "patch-to-br3-brex"
Interface "patch-to-br3-brex"
type: patch
options: {peer="patch-to-br3"}
ovs_version: "2.0.0"
[root@controller124 ~]# ip address add 10.121.2.134/24 dev br1
[root@controller124 ~]# ip address add 10.121.2.135/24 dev br2
[root@controller124 ~]# ip address add 10.121.2.136/24 dev br3
[root@controller124 ~]# ip address add 10.121.2.137/24 dev br4
ovs-vsctl add-port br-ex patch-to-br1 ovs-vsctl set interface patch-to-br1 type=patch ovs-vsctl set interface patch-to-br1 options:peer=patch-to-br1-brex ovs-vsctl add-port br1 patch-to-br1-brex ovs-vsctl set interface patch-to-br1-brex type=patch ovs-vsctl set interface patch-to-br1-brex options:peer=patch-to-br1
ovs-vsctl add-port br-ex patch-to-br2 ovs-vsctl set interface patch-to-br2 type=patch ovs-vsctl set interface patch-to-br2 options:peer=patch-to-br2-brex ovs-vsctl add-port br2 patch-to-br2-brex ovs-vsctl set interface patch-to-br2-brex type=patch ovs-vsctl set interface patch-to-br2-brex options:peer=patch-to-br2
ovs-vsctl add-port br-ex patch-to-br3 ovs-vsctl set interface patch-to-br3 type=patch ovs-vsctl set interface patch-to-br3 options:peer=patch-to-br3-brex ovs-vsctl add-port br3 patch-to-br3-brex ovs-vsctl set interface patch-to-br3-brex type=patch ovs-vsctl set interface patch-to-br3-brex options:peer=patch-to-br3
ovs-vsctl add-port br-ex patch-to-br4 ovs-vsctl set interface patch-to-br4 type=patch ovs-vsctl set interface patch-to-br4 options:peer=patch-to-br4-brex ovs-vsctl add-port br4 patch-to-br4-brex ovs-vsctl set interface patch-to-br4-brex type=patch ovs-vsctl set interface patch-to-br4-brex options:peer=patch-to-br4
ip address add 10.121.2.154/24 dev br1 ip address add 10.121.2.155/24 dev br2 ip address add 10.121.2.156/24 dev br3 ip address add 10.121.2.157/24 dev br4