Linux系统下如何实现双网卡负载均衡

怎么在Linux下实现双网卡负载均衡？本文会给你答案。

系统环境：RHEL5
硬件环境：IBM X3650

一、建立虚拟网络接口ifcfg-bond0文件
[root@yangwenjun ~]# cd /etc/sysconfig/network-scripts/
[root@yangwenjun network-scripts]# cp ifcfg-eth0 ifcfg-bond0
其内容为：
[root@yangwenjun network-scripts]# more ifcfg-bond0
# Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
DEVICE=bond0
BROADCAST=192.168.1.255
IPADDR=192.168.1.3
NETMASK=255.255.255.0
NETWORK=192.168.1.0
MTU=1500
GATEWAY=192.168.1.1
[root@yangwenjun network-scripts]#

二、编辑原有网卡eth0和eth信息文件
使其内容为：
[root@yangwenjun network-scripts]# more ifcfg-eth0
# Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
MASTER=bond0
slave=yes
[root@yangwenjun network-scripts]# more ifcfg-eth1
# Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
MASTER=bond0
slave=yes
[root@yangwenjun network-scripts]#

三、编辑/etc/modprobe.conf加入下面两行
[root@yangwenjun network-scripts]# vi /etc/modprobe.conf
alias bond0 bonding
options bond0 miimon=100 mode=1
加入后我的modprobe.conf内容为：
[root@yangwenjun network-scripts]# more /etc/modprobe.conf
alias eth0 bnx2
alias eth1 bnx2
alias scsi_hostadapter aacraid
alias scsi_hostadapter1 ata_piix
alias peth0 bnx2
alias bond0 bonding
options bond0 miimon=100 mode=1

四、编辑/etc/rc.d/rc.local文件，加入
ifenslave bond0 eth0 eth1

重新启动后，负载均衡就能正常工作了，可以用ifconfig查看具体信息
[root@yangwenjun network-scripts]# ifconfig
bond0     Link encap:Ethernet  HWaddr 00:1A:64:6A:55:98
          inet addr:192.168.1.3  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21a:64ff:fe6a:5598/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:985369 errors:0 dropped:0 overruns:0 frame:0
          TX packets:804306 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:148943796 (142.0 MiB)  TX bytes:2097755332 (1.9 GiB)

eth0      Link encap:Ethernet  HWaddr 00:1A:64:6A:55:98
          inet6 addr: fe80::21a:64ff:fe6a:5598/64 Scope:Link
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:984133 errors:0 dropped:0 overruns:0 frame:0
          TX packets:804292 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:148805154 (141.9 MiB)  TX bytes:2097751381 (1.9 GiB)

eth1      Link encap:Ethernet  HWaddr 00:1A:64:6A:55:98
          inet6 addr: fe80::21a:64ff:fe6a:5598/64 Scope:Link
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:1236 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:138642 (135.3 KiB)  TX bytes:4275 (4.1 KiB)
          Interrupt:16 Memory:ca000000-ca011100

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:24 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1680 (1.6 KiB)  TX bytes:1680 (1.6 KiB)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:984026 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1657683 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:152730203 (145.6 MiB)  TX bytes:2150908601 (2.0 GiB)
          Interrupt:21 Memory:ce000000-ce011100

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:804296 errors:0 dropped:0 overruns:0 frame:0
          TX packets:984134 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2097747314 (1.9 GiB)  TX bytes:148805214 (141.9 MiB)

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:1532 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:132808 (129.6 KiB)  TX bytes:0 (0.0 b)

[root@yangwenjun network-scripts]#a