警告
本文最后更新于 2021-03-27，文中内容可能已过时。
bond 可以将多个网卡绑定到一起，可以让两个或多个接口作为一个接口，同时提高带宽，并提供网络链路的冗余，当有其中一块网卡故障的时候，不会中断服务器的业务。
查看系统 bond
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###bond模块常用信息
## 查看bond模块信息
modinfo bonding
## 查看bond模块是否加载
lsmod | grep bonding
## 加载bond模块
modprobe --first-time bonding ##临时加载，重启失效
modprobe bonding ##永久加载
## 可以卸载模块
modprobe -r bonding
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设置网卡bond
CentOS7 的网卡配置位于 ``/etc/sysconfig/network-scripts`
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cd /etc/sysconfig/network-scripts
-rw-r--r--. 1 root root 363 Mar 23 07:52 ifcfg-em1
-rw-r--r--. 1 root root 100 Mar 26 05:56 ifcfg-em2
-rw-r--r--. 1 root root 100 Mar 26 05:56 ifcfg-em3
-rw-r--r--. 1 root root 275 Mar 20 02:45 ifcfg-em4
-rw-r--r--. 1 root root 254 Aug 24 2018 ifcfg-lo
-rw-r--r--. 1 root root 281 Mar 22 08:42 ifcfg-p1p1
-rw-r--r--. 1 root root 312 Mar 25 06:27 ifcfg-p1p2
lrwxrwxrwx. 1 root root 24 Mar 20 02:42 ifdown -> ../../../usr/sbin/ifdown
-rwxr-xr-x. 1 root root 654 Aug 24 2018 ifdown-bnep
-rwxr-xr-x. 1 root root 6532 Aug 24 2018 ifdown-eth
-rwxr-xr-x. 1 root root 6190 Oct 30 2018 ifdown-ib
-rwxr-xr-x. 1 root root 781 Aug 24 2018 ifdown-ippp
-rwxr-xr-x. 1 root root 4540 Aug 24 2018 ifdown-ipv6
lrwxrwxrwx. 1 root root 11 Mar 20 02:42 ifdown-isdn -> ifdown-ippp
-rwxr-xr-x. 1 root root 2130 Aug 24 2018 ifdown-post
-rwxr-xr-x. 1 root root 1068 Aug 24 2018 ifdown-ppp
-rwxr-xr-x. 1 root root 870 Aug 24 2018 ifdown-routes
-rwxr-xr-x. 1 root root 1456 Aug 24 2018 ifdown-sit
-rwxr-xr-x. 1 root root 1621 Mar 17 2017 ifdown-Team
-rwxr-xr-x. 1 root root 1556 Mar 17 2017 ifdown-TeamPort
-rwxr-xr-x. 1 root root 1462 Aug 24 2018 ifdown-tunnel
lrwxrwxrwx. 1 root root 22 Mar 20 02:42 ifup -> ../../../usr/sbin/ifup
-rwxr-xr-x. 1 root root 12415 Aug 24 2018 ifup-aliases
-rwxr-xr-x. 1 root root 910 Aug 24 2018 ifup-bnep
-rwxr-xr-x. 1 root root 13475 Aug 24 2018 ifup-eth
-rwxr-xr-x. 1 root root 10114 Oct 30 2018 ifup-ib
-rwxr-xr-x. 1 root root 12075 Aug 24 2018 ifup-ippp
-rwxr-xr-x. 1 root root 11893 Aug 24 2018 ifup-ipv6
lrwxrwxrwx. 1 root root 9 Mar 20 02:42 ifup-isdn -> ifup-ippp
-rwxr-xr-x. 1 root root 650 Aug 24 2018 ifup-plip
-rwxr-xr-x. 1 root root 1064 Aug 24 2018 ifup-plusb
-rwxr-xr-x. 1 root root 4997 Aug 24 2018 ifup-post
-rwxr-xr-x. 1 root root 4154 Aug 24 2018 ifup-ppp
-rwxr-xr-x. 1 root root 2001 Aug 24 2018 ifup-routes
-rwxr-xr-x. 1 root root 3303 Aug 24 2018 ifup-sit
-rwxr-xr-x. 1 root root 1755 Mar 17 2017 ifup-Team
-rwxr-xr-x. 1 root root 1876 Mar 17 2017 ifup-TeamPort
-rwxr-xr-x. 1 root root 2711 Aug 24 2018 ifup-tunnel
-rwxr-xr-x. 1 root root 1836 Aug 24 2018 ifup-wireless
-rw-r--r--. 1 root root 2206 Mar 26 05:50 inactive
-rwxr-xr-x. 1 root root 5419 Aug 24 2018 init.ipv6-global
-rw-r--r--. 1 root root 20671 Aug 24 2018 network-functions
-rw-r--r--. 1 root root 31027 Aug 24 2018 network-functions-ipv6
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可以看到，当前系统有4个 em 千兆网卡，已经2个 p1 万兆网卡，接下来我们把 em2 和 em3 bond 到一个虚拟网卡上。注意，最好先备份网卡配置信息，因为我们做 bond 的时候不需要网卡 mac 地址，所以原来的信息会被删除，备份一个原来的文件比较安全。
说明：把原有的配置 ip 信息去掉，把 BOOTPROTO 修改成 none，然后新加 MASTER=bond0，SLAVE=yes 即可
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## 网卡 em2，不需要 mac 地址，绑定到 bond0
vim ifcfg-em2
NAME=em2
DEVICE=em2
TYPE=Ethernet
BOOTPROTO=none
NM_CONTROLLED=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
## 网卡 em3，不需要 mac 地址，绑定到 bond0
vim ifcfg-em3
NAME=em3
DEVICE=em3
TYPE=Ethernet
BOOTPROTO=none
NM_CONTROLLED=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
## 开始设置 bond0，设置模式 6：负载均衡
vim ifcfg-bond0
DEVICE=bond0
TYPE=Ethernet
BOOTPROTO=static
BONDING_MASTER=yes
ONBOOT=yes
BOOTPROTO=none
BONDING_OPTS="mode=6 miimon=100" ## 配置此项就无需创建modprobe.conf文件
IPADDR=192.168.1.213
PREFIX=24
GATEWAY=192.168.1.1
DNS1=8.8.8.8
DNS2=114.114.114.114
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现在，我们可以重启网络
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# 重启网络
systemctl restart network
## 如果报错 Failed to start LSB: Bring up/down networking
## 可能跟 NetworkManager 服务有冲突
systemctl stop NetworkManager
chkconfig NetworkManager off
# 查看bond信息
cat /proc/net/bonding/bond0
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看到，目前的模式已经是 adaptive load balancing
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Bonding Mode: adaptive load balancing
Primary Slave: None
Currently Active Slave: em2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Slave Interface: em2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 2c:ea:7f:ea:9b:29
Slave queue ID: 0
Slave Interface: em3
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 2c:ea:7f:ea:9b:2a
Slave queue ID: 0
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我们可以查看一下当前 bond0 的网络配置，看出来网卡已经可以使用叠加后的网速了
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ethtool bond0
Settings for bond0:
Supported ports: [ ]
Supported link modes: Not reported
Supported pause frame use: No
Supports auto-negotiation: No
Supported FEC modes: Not reported
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Advertised FEC modes: Not reported
Speed: 13000Mb/s
Duplex: Full
Port: Other
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Link detected: yes
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bond 的配置参数详解
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miimon 指定链路监控频率，单位毫秒，默认值为0(关闭),一般设置100以上
mode 指定一种绑定策略，默认值为0(balance-rr)轮询。
0 balance-rr 轮询策略(round-robin)
1 active-backup 主备策略(当主网卡不可用时，启动备用)
2 balance-xor XOR策略
3 broadcast 广播策略
4 802.3ad 动态链接聚合,创建具有相同速度的聚合组和双工设置
5 balance-tlb 发送负载均衡
6 balance-alb 收发负载均衡(各个网络实现负载均衡，我们选择此模式)
max_bonds 指定创建bond的数量，默认1
更多帮助查看/usr/share/doc/iputils-20160308/README.bonding
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常用命令
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ifdown em1
ifup em1
ethtool em1
ethtool bond0
cat /proc/net/bonding/bond0
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