借助
bonding将多个物理网卡创建为单个虚拟逻辑网卡
1. 什么是 bonding
网卡bond是通过多张网卡绑定为一个逻辑网卡，实现本地网卡冗余、带宽扩容和负载均衡。内核版本2.4.12以上均提供了bonding模块，之前的版本可以通过patch实现。
2. 检查并开启 bonding 模块
首先检查内核是否支持bonding：
> cat /etc/redhat-release
CentOS Linux release 7.8.2003 (Core)
> uname -r
3.10.0-1127.el7.x86_64
> cat /boot/config-3.10.0-1127.el7.x86_64 | grep -i bonding
CONFIG_BONDING=m
可以看到当前内核支持bonding，查看bonding模块信息：
> modinfo bonding | less
filename: /lib/modules/3.10.0-1127.el7.x86_64/kernel/drivers/net/bonding/bonding.ko
.xz
author: Thomas Davis, tadavis@lbl.gov and many others
description: Ethernet Channel Bonding Driver, v3.7.1
version: 3.7.1
license: GPL
alias: rtnl-link-bond
retpoline: Y
rhelversion: 7.8
srcversion: 02BB340820F6F1A042A3033
depends:
intree: Y
vermagic: 3.10.0-1127.el7.x86_64 SMP mod_unload modversions
......
启用bonding模块，并查看是否加载：
> modprobe bonding
> lsmod | grep bonding
bonding 152979 0
3. 创建 bond0 接口配置文件
Dell PowerEdge R730 服务器拥有四路全双工千兆网口，先查看当前的网络连接与设备：
> nmcli c show
NAME UUID TYPE DEVICE
em1 d4d8562f-91e2-4f9f-af48-485d2b0d744f ethernet em1
em2 d82f2490-8fa3-49b9-8e40-275bec92d230 ethernet em2
em3 24c1fdcd-56b2-4d09-ab1b-ab347a73a3ad ethernet em3
em4 31a2eadc-2528-4f4f-907e-35a5801090a2 ethernet --
> nmcli d status
DEVICE TYPE STATE CONNECTION
em1 ethernet connected em1
em2 ethernet connected em2
em3 ethernet connected em3
em4 ethernet unavailable --
bond0 bond unmanaged --
lo loopback unmanaged --
可以看到此时系统中已经创建了bond0设备，因为NetworkManager在/etc/sysconfig/network-scripts/目录下没有找到bond0对应的配置文件ifcfg-bond0，所以当前处于unmanaged状态。
创建ifcfg-bond0配置文件，并输入以下内容：
> vim /etc/sysconfig/network-scripts/ifcfg-bond0
> cat /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
TYPE=Bond
NAME=bond0
BOOTPROTO=none
ONBOOT=yes
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
IPADDR=xxx.xxx.xxx.xxx
PREFIX=24
GATEWAY=xxx.xxx.xxx.xxx
DNS1=xxx.xxx.xxx.xxx
BONDING_MASTER=yes
BONDING_OPTS="mode=6 miimon=100"
之后创建em1和em2对应的 Slave 配置文件：
> cat /etc/sysconfig/network-scripts/ifcfg-bond-slave-em1
TYPE=Ethernet
NAME=bond-slave-em1
DEVICE=em1
ONBOOT=yes
MASTER=bond0
SLAVE=yes
> cat /etc/sysconfig/network-scripts/ifcfg-bond-slave-em2
TYPE=Ethernet
NAME=bond-slave-em2
DEVICE=em2
ONBOOT=yes
MASTER=bond0
SLAVE=yes
最后，将ifcfg-em1和ifcfg-em2中的ONBOOT=yes替换为ONBOOT=no：
> sed -i '/ONBOOT/c ONBOOT=no' /etc/sysconfig/network-scripts/ifcfg-em1
> sed -i '/ONBOOT/c ONBOOT=no' /etc/sysconfig/network-scripts/ifcfg-em2
重启网络服务：
> systemctl restart network
4. 检查 bonding 状态
检查当前的bonding状态：
[root@idv-node1 ~] cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
Bonding Mode: adaptive load balancing
Primary Slave: None
Currently Active Slave: em1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Slave Interface: em1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 18:66:da:f3:b4:28
Slave queue ID: 0
Slave Interface: em2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 18:66:da:f3:b4:29
Slave queue ID: 0
使用ethtool查看bond0速率，已达到2000Mb/s：
[root@idv-node1 ~] 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: 2000Mb/s
Duplex: Full
Port: Other
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Link detected: yes
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