双网卡绑定bond0-anfenghu-ChinaUnix博客

网卡绑定技术有助于保证高可用性特性并提供其它优势以提高网络性能，在这介绍的Linux双网卡绑定实现就是使用两块网卡虚拟成为一块网卡，这个聚合起来的设备看起来是一个单独的以太网接口设备，通俗点讲就是两块网卡具有相同的IP地址而并行链接聚合成一个逻辑链路工作，这样即使其中的一块物理网卡出现故障，也不会导致连接中断。

网卡绑定就是多张网卡逻辑上作为一张网卡用。可分为，负载均衡绑定和冗余绑定两种。

1.编辑虚拟网络接口配置文件

[root@test~]# more /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
IPADDR=172.16.4.100
NETMASK=255.255.255.0
BROADCAST=172.16.4.255
NETWORK=172.168.4.100

GATEWAY=172.16.4.1

ONBOOT=yes

BOOTPROTO=none

USERCTL=no
TYPE=BOND
BONDING_OPTS="mode=1 miimon=50"

2.编辑各网卡的配置文件，注意编辑之前做好备份工作

[root@test~]# more /etc/sysconfig/network-scripts/ifcfg-eth0
BOOTPROTO=none
TYPE=Ethernet
DEVICE=eth0
ONBOOT=yes
MASTER=bond0
slave=yes

USERCTL=no
[root@test ~]# more /etc/sysconfig/network-scripts/ifcfg-eth1
BOOTPROTO=none
TYPE=Ethernet
DEVICE=eth1
ONBOOT=yes
MASTER=bond0
slave=yes

USERCTL=no

3.修改/etc/modprobe.conf 文件，同样做好备份，最后加入2行
alias bond0 bonding
options bond0 miimon=100 mode=1
注：
（1）、miimon 是链路监测的时间间隔单位是毫秒，miimon=100的意思就是，每100毫秒检测网卡和交换机之间是否连通，如不通则使用另外的链路。
（2)、mode=0 表示负载均衡方式，两块网卡都工作，需要交换机作支持
mode=1 表示冗余方式，网卡只有一个工作，一个出问题启用另外的
mode=6 表示负载均衡方式，两块网卡都工作，不需要交换机作支持

[root@test~]# more /etc/modprobe.conf
alias eth0 b44
alias eth1 8139too
alias usb-controller ehci-hcd
alias usb-controller1 ohci-hcd
alias bond0 bonding
options bond0 miimon=100 mode=0

4.在/etc/rc.d/rc.local 加入如下一行
ifenslave bond0 eth0 eth1

[root@test~]# more /etc/rc.d/rc.local
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local
ifenslave bond0 eth0 eth1

5.重新启动后负载平衡已经能正常工作，service network restart，6.查看bond0的工作状态

[root@test~]# more /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v2.6.1 (October 29, 2004)

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Link Failure Count: 1
Permanent HW addr: 00:1b:b9:58:8b:b2

Slave Interface: eth1
MII Status: down
Link Failure Count: 0
Permanent HW addr: 00:07:40:6c:ac:c8

7.查看经过绑定后的网卡工作情况

[root@test ~]# ifconfig -a
bond0 Link encap:Ethernet HWaddr00:1B:B9:58:8B:B2

inet addr:172.16.4.100 Bcast:172.16.4.255 Mask:255.255.255.0
inet6 addr:fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNINGMASTER MULTICAST MTU:1500 Metric:1
RX packets:744154errors:0 dropped:0 overruns:0 frame:0
TX packets:1866915errors:0 dropped:0 overruns:0 carrier:0
collisions:0txqueuelen:0
RX bytes:1099876146 (1.0GiB) TX bytes:121233595 (115.6 MiB)

eth0 Link encap:Ethernet HWaddr00:1B:B9:58:8B:B2
inet6 addr:fe80::21b:b9ff:fe58:8bb2/64 Scope:Link
UP BROADCAST RUNNINGSLAVE MULTICAST MTU:1500 Metric:1
RX packets:744154errors:0 dropped:0 overruns:0 frame:0
TX packets:1866905errors:0 dropped:0 overruns:0 carrier:0
collisions:0txqueuelen:1000
RX bytes:1099876146 (1.0GiB) TX bytes:121232839 (115.6 MiB)
Interrupt:9

eth1 Link encap:Ethernet HWaddr00:1B:B9:58:8B:B2
inet6 addr:fe80::21b:b9ff:fe58:8bb2/64 Scope:Link
UP BROADCAST SLAVEMULTICAST MTU:1500 Metric:1
RX packets:0 errors:0dropped:0 overruns:0 frame:0
TX packets:10 errors:0dropped:0 overruns:0 carrier:0
collisions:0txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:756 (756.0 b)
Interrupt:11 Baseaddress:0x1000

lo Link encap:Local Loopback
inetaddr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128Scope:Host
UP LOOPBACKRUNNING MTU:16436 Metric:1
RX packets:2129 errors:0dropped:0 overruns:0 frame:0
TX packets:2129 errors:0dropped:0 overruns:0 carrier:0
collisions:0txqueuelen:0
RX bytes:1998893 (1.9MiB) TX bytes:1998893 (1.9 MiB)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0dropped:0 overruns:0 frame:0
TX packets:0 errors:0dropped:0 overruns:0 carrier:0
collisions:0txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)