RHEL6 双网卡绑定
为了提供网络的高可用性,我们可能需要将多块网卡绑定成一块虚拟网卡对外提供服务,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。多网卡绑定这个词在不同的平台有不同叫法,在Linux下叫bonding,IBM称为etherchanel,broadcom叫team,但是名字怎么变,效果都是将两块或更多的网卡当做一块网卡使用,在增加带宽的同时也可以提高冗余性。比如我们在RHEL6下可以将eth0和eth1绑定成虚拟网卡bond0。
1、 添加虚拟网卡
# vim /etc/sysconfig/network-scripts/ifcfg-bond0 # cat /etc/sysconfig/network-scripts/ifcfg-bond0 DEVICE=bond0 BOOTPROTO=static ONBOOT=yes IPADDR=192.168.12.128 NETMASK=255.255.255.0 USERCTL=no # |
2、 配置本地网卡信息
# vim /etc/sysconfig/network-scripts/ifcfg-eth0 # vim /etc/sysconfig/network-scripts/ifcfg-eth1 # cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE="eth0" TYPE=Ethernet BOOTPROTO=static ONBOOT="yes" MASTER=bond0 SLAVE=yes USERCTL=no # cat /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE="eth1" TYPE=Ethernet BOOTPROTO=static ONBOOT="yes" MASTER=bond0 SLAVE=yes USERCTL=no # |
3、 模块加载
# vim /etc/modprobe.d/dist.conf # grep bond0 /etc/modprobe.d/dist.conf alias bond0 bonding options bond0 miimon=100 mode=1 //miimon是指多久时间要检查网络一次,单位是ms(毫秒)这边的100,是100ms,即是0.1秒 //mode共有七种(0~6),这里解释两个常用的选项。 Ø mode=0:平衡负载模式,两块网卡都在工作。 Ø mode=1:自动主备模式,其中一块网卡在工作(若eth0断掉),则自动切换到另一个块网卡(eth1做备份)。 |
4、 重启网络服务,使配置生效
# service network restart # cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009) Bonding Mode: fault-tolerance (active-backup) Primary Slave: None Currently Active Slave: eth0 MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth0 MII Status: up Speed: 100 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:45:bf:a0 Slave queue ID: 0 Slave Interface: eth1 MII Status: up Speed: 100 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:45:bf:aa Slave queue ID: 0 # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.128.0 0.0.0.0 255.255.255.0 U 0 0 0 bond0 169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 0 bond0 # lsmod | grep bond bonding 109558 0 # |
5、 测试
选择一台Linux机器ping测试机,然后停掉当前使用的网卡eth0,查看是否能够继续ping通
# ifdown eth0 # cat /proc/net/bonding/bond0 //发现此时激活的网卡为eth1了,如果测试可以ping通,则实验完成 Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009) Bonding Mode: fault-tolerance (active-backup) Primary Slave: None Currently Active Slave: eth1 MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth1 MII Status: up Speed: 100 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:45:bf:aa Slave queue ID: 0 # |