CentOS网卡绑定实现

NIC channel bonding allows multiple network cards to act as one,allowing increased bandwidth and redundancy.Let's assume we have two network interfaces ("eth0" and "eth1") and we want to bond them so they look like a single interface ("bond0").Add the following line to the "/etc/modprobe.conf" file.============================= alias bond0 bonding============================= The files defining the regular and bonded interfaces are located in the "/etc/sysconfig/network-scripts" directory. Create a new file called "ifcfg-bond0" for the bonded interface with the following contents (adjust the network parameters as applicable).============================= [root@rhel5 network-scripts]# cat ifcfg-bond0# Intel Corporation 82540EM Gigabit Ethernet ControllerDEVICE=bond0BOOTPROTO=staticONBOOT=yesUSERCTL=noIPADDR=192.168.99.131NETMASK=255.255.255.0BONDING_OPTS="mode=1 miimon=100"============================= 说明：miimon是用来进行链路监测的。 比如:miimon=100，那么系统每100ms监测一次链路连接状态，如果有一条线路不通就转入另一条线路；mode的值表示工作模式，他共有0，1,2,3四种模式，常用的为0,1两种。mode=0表示load balancing (round-robin)为负载均衡方式，两块网卡都工作。mode=1表示fault-tolerance (active-backup)提供冗余功能，工作方式是主备的工作方式,也就是说默认情况下只有一块网卡工作,另一块做备份.bonding只能提供链路监测，即从主机到交换机的链路是否接通。如果只是交换机对外的链路down掉了，而交换机本身并没有故障，那么bonding会认为链路没有问题而继续使用Amend the existing "ifcfg-eth0" and "ifcfg-eth1" files,adding the "MASTER" and "SLAVE" parameters. The contents of these files should look like this.============================= [root@rhel5 network-scripts]# cat ifcfg-eth0# Intel Corporation 82540EM Gigabit Ethernet ControllerDEVICE=eth0BOOTPROTO=noneUSERCTL=noONBOOT=yesMASTER=bond0SLAVE=yes[root@rhel5 network-scripts]# cat ifcfg-eth1# Intel Corporation 82540EM Gigabit Ethernet ControllerDEVICE=eth1BOOTPROTO=noneONBOOT=yesUSERCTL=noneMASTER=bond0SLAVE=yes============================= Restart the network service.============================= # service network restart============================= Once the bond is configured it acts like any other Ethernet device. For example,you can configure alias interfaces to handle multiple IP addresses,as shown below.Create the "ifcfg-bond0:1" and "ifcfg-bond0:2" files in the "/etc/sysconfig/network-scripts" directory with the following contents.============================= # ifcfg-bond0:1 file contentsDEVICE=bond0:1BOOTPROTO=noneONBOOT=yesNETWORK=192.168.0.0NETMASK=255.255.255.0IPADDR=192.168.0.172USERCTL=noBONDING_OPTS="mode=1 miimon=100"# ifcfg-bond0:2 file contentsDEVICE=bond0:2BOOTPROTO=noneONBOOT=yesNETWORK=192.168.0.0NETMASK=255.255.255.0IPADDR=192.168.0.173USERCTL=noBONDING_OPTS="mode=1 miimon=100"============================= Restart the network service for the changes to take effect.通过查看bond0的工作状态查询能详细的掌握bonding的工作状态[root@redflag bonding]# cat /proc/net/bonding/bond0bonding.c:v2.4.1 (September 15,2003)Bonding Mode: load balancing (round-robin)MII Status: upMII Polling Interval (ms): 0Up Delay (ms): 0Down Delay (ms): 0Multicast Mode: all slavesSlave Interface: eth1MII Status: upLink Failure Count: 0Permanent HW addr: 00:0e:7f:25:d9:8aSlave Interface: eth0MII Status: upLink Failure Count: 0Permanent HW addr: 00:0e:7f:25:d9:8b