如何在Ubuntu Linux 16.04 LTS服务器上通过绑定设置KVM桥接器。
我总共有四个Intel I350千兆网络连接(NIC)。
如何将eth0通过eth2绑定/奴役到一个绑定的接口，该接口称为bond0，具有802.3ad动态链接聚合模式。
如何配置与Ubuntu Server 16.04 LTS的桥接和绑定？
您需要设置桥接，以便基于KVM/XEN或者LXC容器的虚拟机(来宾)显示在与主机服务器相同的网络上。
桥接配置需要安装bridge-utils。
绑定配置需要ifenslave实用程序。
在本教程中，您将"学习如何在Ubuntu 16.04 LTS服务器上创建绑定和桥接网络"。

在Ubuntu LTS服务器上具有绑定功能的示例设置KVM桥接器

在Ubuntu上安装ifenslave

执行以下命令：

$ sudo apt install ifenslave bridge-utils

在Ubuntu上使用Bonding桥接

备份您的/etc/network/interfaces文件，运行：

$ sudo cp /etc/network/interfaces /etc/network/interfaces.bakup

编辑/etc/network/interfaces，运行：

$ sudo vi /etc/network/interfaces

首先创建不带IP地址的bond0接口配置，并按如下方式奴役eth0和eth2：

auto bond0
iface bond0 inet manual
bond-lacp-rate 1
post-up ifenslave bond0 eth0 eth2
pre-down ifenslave -d bond0 eth0 eth2
bond-slaves none
bond-mode 4
bond-lacp-rate fast
bond-miimon 100
bond-downdelay 0
bond-updelay 0
bond-xmit_hash_policy 1

下一步编辑/更新eth0，而没有绑定主键bond0的IP地址：

auto eth0
iface eth0 inet manual
bond-master bond0
 
auto eth2
iface eth2 inet manual
bond-master bond0

最后，创建br0网桥并分配IP地址和其他IP设置，包括网关：

auto br0
iface br0 inet static
address 10.86.115.66
netmask 255.255.255.192
broadcast 10.86.115.127
gateway 10.86.115.65
# -----------------------------------------
# Example: set dns server too
# dns-nameservers 8.8.8.8 8.8.4.4 10.86.115.1
# -----------------------------------------
# Static route example 
#up route add -net 10.0.0.0/8 gateway 10.86.115.65
#down route del -net 10.0.0.0/8
#up route add -net 161.26.0.0/16 gateway 10.86.115.65
#down route del -net 161.26.0.0/16
# -----------------------------------------
# Want to know what the default and more info 
# on the following options? 
# Read brctl(8) man page
# -----------------------------------------
bridge_ports bond0
bridge_stp off
bridge_fd 9
bridge_hello 2
bridge_maxage 12

保存并关闭文件。
重新启动服务器或者重新启动网络服务：

$ sudo systemctl restart networking

验证一下：

$ brctl show

输出示例：

bridge name	bridge id		STP enabled	interfaces
br0		8000.0025904fb06c	no		bond0

查看bond0状态和其他信息：

$ more /proc/net/bonding/bond0

输出示例：

Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
 
Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer3+4 (1)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
 
802.3ad info
LACP rate: fast
Min links: 0
Aggregator selection policy (ad_select): stable
System priority: 65535
System MAC address: 00:25:90:4f:b0:6c
Active Aggregator Info:
	Aggregator ID: 1
	Number of ports: 1
	Actor Key: 9
	Partner Key: 43
	Partner Mac Address: b0:fa:eb:13:97:00
 
Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:25:90:4f:b0:6c
Slave queue ID: 0
Aggregator ID: 1
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
    system priority: 65535
    system mac address: 00:25:90:4f:b0:6c
    port key: 9
    port priority: 255
    port number: 1
    port state: 63
details partner lacp pdu:
    system priority: 32768
    system mac address: b0:fa:eb:13:97:00
    oper key: 43
    port priority: 32768
    port number: 300
    port state: 61
 
Slave Interface: eth2
MII Status: down
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 00:25:90:4f:b0:6e
Slave queue ID: 0
Aggregator ID: 2
Actor Churn State: churned
Partner Churn State: churned
Actor Churned Count: 1
Partner Churned Count: 1
details actor lacp pdu:
    system priority: 65535
    system mac address: 00:25:90:4f:b0:6c
    port key: 0
    port priority: 255
    port number: 2
    port state: 71
details partner lacp pdu:
    system priority: 65535
    system mac address: 00:00:00:00:00:00
    oper key: 1
    port priority: 255
    port number: 1
    port state: 1

确保路由正确无误：

$ ip r show
$ ping google.com
$ ping www.theitroad.local