Bonding就是將多塊網卡綁定同一IP地址對外提供服務，可以實現高可用或者負載均衡。當然，直接給兩塊網卡設置同一IP地址是不可能的。通過bonding，虛擬一塊網卡對外提供連接，物理網卡的被修改爲相同的MAC地址。
一、Bonding的常用工作模式
Mode 0 (balance-rr)
輪轉（ Round-robin）策略：從頭到尾順序的在每一個slave接口上面發送數據包。本模式提供負載均衡和容錯的能力。
Mode 1 (active-backup)
活動-備份（主備）策略：在綁定中，只有一個slave被激活。當且僅當活動的slave接口失敗時纔會激活其他slave。爲了避免交換機發生混亂此時綁定的MAC地址只有一個外部端口上可見。
Mode 3 (broadcast)
廣播策略：在所有的slave接口上傳送所有的報文。本模式提供容錯能力。
二、Bonding配置
創建bonding設備的配置文件：
#vim /etc/sysconfig/network-scripts/ifcfg-bond0 DEVICE=bond0 BOOTPROTO=none BONDING_OPTS=“miimon=100 mode=0” #vim /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 BOOTPROTO=none MASTER=bond0 SLAVE=yes USERCTL=no
說明：miimon是用來進行鏈路監測的。如果miimon=100，那麼系統每100ms 監測一次鏈路連接狀態，如果有一條線路不通就轉入另一條線路
查看bond0狀態：cat /proc/net/bonding/bond
關於bonding的詳細配置請參照：
/usr/src/linux-3.18.41/Documentation/networking/bonding.txt
三、bonding實驗演示
步驟1：首先確定自己的操作系統是否支持bonding
[root@CentOS6 ~]# modinfo bonding filename: /lib/modules/2.6.32-642.el6.x86_64/kernel/drivers/net/bonding/bonding.ko author: Thomas Davis, [email protected] and many others description: Ethernet Channel Bonding Driver, v3.7.1 version: 3.7.1 ...
如果沒有消息返回，說明內核不支持bonding，需要重新編譯內核。
步驟2：創建bonding配置文件
[root@CentOS network-scripts]# cat ifcfg-bond0 DEVICE=bond0 BOOTPROTO=none IPADDR=192.168.1.9 GATEWAY=192.168.1.1 PREFIX=24 DNS1=8.8.8.8 BONDING_OPTS="miimon=100 mode=1"
步驟3：修改網卡配置文件
[root@CentOS network-scripts]# cat ifcfg-eth0 DEVICE=eth0 BOOTPROTO=none MASTER=bond0 SLAVE=yes [root@CentOS network-scripts]# cat ifcfg-eth1 DEVICE=eth1 BOOTOPRO=none MASTER=bond0 SLAVE=yes
步驟4：重啓網絡服務
[root@CentOS network-scripts]# service network restart Shutting down interface bond0: ...
步驟5：查看配置情況
[root@CentOS network-scripts]# ifconfig bond0 Link encap:Ethernet HWaddr 00:0C:29:30:84:C4 inet addr:192.168.1.9 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fe30:84c4/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:1000 errors:0 dropped:0 overruns:0 frame:0 TX packets:488 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:82884 (80.9 KiB) TX bytes:56939 (55.6 KiB) eth0 Link encap:Ethernet HWaddr 00:0C:29:30:84:C4 UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:1095 errors:0 dropped:0 overruns:0 frame:0 TX packets:677 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:95368 (93.1 KiB) TX bytes:75001 (73.2 KiB) eth1 Link encap:Ethernet HWaddr 00:0C:29:30:84:C4 UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:243 errors:0 dropped:0 overruns:0 frame:0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:14734 (14.3 KiB) TX bytes:614 (614.0 b) ... [root@CentOS network-scripts]# cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) 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: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:30:84:c4 Slave queue ID: 0 Slave Interface: eth1 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:30:84:ce Slave queue ID: 0
步驟6：測試
