Linux双网卡绑定——理论与实践（实践篇）

Linux双网卡绑定的主要实现步骤为：
1. 配置一个虚拟的网卡bond0
2. 配置eth0，eth1为slave模式
3. 加载bonding模块
4. 重启系统

下面将详细介绍每个步骤
一. 配置虚拟网卡bond0

新建/etc/sysconfig/network-scripts/ifcfg-bond0文件，内容如下：

#bond0配置文件
DEVICE=bond0
BOOTPROTO=static
IPADDR=192.168.0.100
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
GATEWAY=192.168.0.1
ONBOOT=yes
TYPE=Ethernet

二. 配置eth0，eth1为slave模式

更改配置文件/etc/sysconfig/network-scripts/ifcfg-eth0

#eth0配置文件
DEVICE=eth0
BOOTPROTO=none 
SLAVE=yes 
MASTER=bond0
USERCTL=yes

更改配置文件/etc/sysconfig/network-scripts/ifcfg-eth1

#eth1配置文件
DEVICE=eth1
BOOTPROTO=none 
SLAVE=yes 
MASTER=bond0
USERCTL=yes

三. 加载bonding模块

修改模块配置文件/etc/modprobe.conf，在最后加入以下内容：

alias bond0 bonding
options bond0 miimon=100 mode=0

四. 重启系统

重启之后，测试bonding是否正常运行，运行ifconfig命令，结果如下

[root@linux ~]# ifconfig
bond0     Link encap:Ethernet  HWaddr 00:0C:29:45:B4:D1 
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe45:b4d1/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:100 errors:0 dropped:0 overruns:0 frame:0
          TX packets:130 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:17527 (17.1 KiB)  TX bytes:20937 (20.4 KiB) eth0      Link encap:Ethernet  HWaddr 00:0C:29:45:B4:D1 
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:65 errors:0 dropped:0 overruns:0 frame:0
          TX packets:99 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:10340 (10.0 KiB)  TX bytes:15317 (14.9 KiB)
          Interrupt:18 Base address:0x1080 eth1      Link encap:Ethernet  HWaddr 00:0C:29:45:B4:D1 
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:40 errors:0 dropped:0 overruns:0 frame:0
          TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7487 (7.3 KiB)  TX bytes:7022 (6.8 KiB)
          Interrupt:19 Base address:0x1400

运行cat /proc/net/bonding/bond0，结果如下：

[root@linux ~]# cat /proc/net/bonding/bond0

Ethernet Channel Bonding Driver: v3.3.0 (June 10, 2008)

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: 0
Permanent HW addr: 00:0c:29:45:b4:d1

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:0c:29:45:b4:db