Bonding工做模式介绍

Bonding

将多块网卡绑定于同一IP地址来对外提供服务，能够实现高可用或者负载均
衡功能。由于直接给两块网卡设置同一IP地址是不能够的，因此能够经过bon-
ding，虚拟出一块网卡提供对外链接，物理网卡则被修改为相同的MAC地址。

Bonding工做模式

Mode 0 (balance-rr)

轮转（Round-robin）策略：从头至尾顺序的在每个slave接口上面发送数
据包。本模式提供负载均衡和容错的能力

Mode 1 (active-backup)

活动-备份（主备）策略：只有一个slave被激活，当且仅当活动的slave接口
失败时才会激活其余slave.为了不交换机发生混乱此时绑定的MAC地址只
有一个外部端口上可见

Mode 3 (broadcast)

广播策略：在全部的slave接口上传送全部的报文,提供容错能力

active-backup、balance-tlb 和 balance-alb 模式不须要交换机的任何特
殊配置。其余绑定模式须要配置交换机以便整合连接。如：Cisco 交换机需
要在模式 0、2 和 3 中使用 EtherChannel，但在模式4中须要 LACP和
EtherChannel

Bonding的实现

1.将主机的两块网卡所有设置为仅主机模式
2.用vim /etc/sysconfig/network-scripts/ifcfg-bond0命令建立ifcfg-bond0文件，
在里面写入

DEVICE=bond0
IPADDR=192.168.30.6
PREFIX=24
BONDING_OPTS='miimon=100 mode=1'     
## 每间隔100ms检查一次，工做模式为模式1

3.设置eth0和eth1

DEVICE=eth0    ## 或者  eth1
BOOTPROTO=none
MASTER=bond0
SLAVE=yes
USERCTL=no
```bash
4.查看bond0的状态
[root@centos6 ~]#cat /proc/net/bonding/bond0 
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)  ##主备模式
Primary Slave: None
Currently Active Slave: eth0  ##网卡eth0在使用
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:29:63:47:1c
Slave queue ID: 0

Slave Interface: eth1   ## 备用网卡
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:63:47:26
Slave queue ID: 0

5.用ip a命令查看网卡信息(肯定mac地址是否都相同)

[root@centos6 ~]#ifconfig 
bond0     Link encap:Ethernet  HWaddr 00:0C:29:63:47:1C  
          inet addr:192.168.12.6  Bcast:192.168.12.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe63:471c/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:36 errors:0 dropped:0 overruns:0 frame:0
          TX packets:52 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:4121 (4.0 KiB)  TX bytes:5881 (5.7 KiB)

eth0      Link encap:Ethernet  HWaddr 00:0C:29:63:47:1C  
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:23 errors:0 dropped:0 overruns:0 frame:0
          TX packets:50 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3341 (3.2 KiB)  TX bytes:5735 (5.6 KiB)

eth1      Link encap:Ethernet  HWaddr 00:0C:29:63:47:1C  
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:13 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:780 (780.0 b)  TX bytes:146 (146.0 b)

6.是否能够ping通

[09:02:24 root@centos7 ~]#ping 192.168.12.6
PING 192.168.12.6 (192.168.12.6) 56(84) bytes of data.
64 bytes from 192.168.12.6: icmp_seq=1 ttl=64 time=2.83 ms
64 bytes from 192.168.12.6: icmp_seq=2 ttl=64 time=0.255 ms
64 bytes from 192.168.12.6: icmp_seq=3 ttl=64 time=0.237 ms
...
--- 192.168.12.6 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2006ms
rtt min/avg/max/mdev = 0.237/1.107/2.831/1.219 ms

7.能够ping通，试验成功
8.卸载

ifconfig  bond0 down ##中止bond0
rm -f  /etc/sysconfig/network-scripts/ifcfg-bond0 ##删除文件
vim  /etc/sysconfig/network-scripts/ifcfg-eth0 ##改回网卡配置
vim  /etc/sysconfig/network-scripts/ifcfg-eth1
rmmod bonding ##卸载bonding模块
service network restart ##重启服务