Linux网卡绑定

  很多情况下我们都需要用到网卡绑定这中情况，例如：大数据传输备份、网卡冗余。使用网卡绑定可以提高网络的传输速度，并且还能保证网络安全性，做到网卡的高可用，甚至可以节省IP地址。

网卡绑定模式

• mode=0：轮询模式

链路的负载均衡，传输带宽增加，具有容错性，当其中一条链路有故障时可以自动切换到正常链路。

• mode=1：主备模式

一块网卡处于活跃状态，另一块处于备份状态，时刻检查活跃网卡的使用情况，当网卡出现故障时，备份网卡自动切换为主网卡。

• mode=2：平衡策略

基于指定的传输HASH策略传输数据包。对负载和容错能力有提升。

• mode=3：广播策略

在每个slave接口上传输每个数据包，此模式提供了容错能力。

• mode=4：动态链路聚合

创建聚合组，根据802.3ad规范将多个slave工作在同一个激活的聚合体下。

• mode=5：适配器传输负载均衡

根据每个slave的负载情况选择slave进行发送，接收时使用当前轮到的slave。该模式要求slave接口的网络设备驱动有某种ethtool支持；而且ARP监控不可用。

• mode=6：适配器适应性负载均衡

在适配器传输负载均衡的基础上增加了接收负载均衡，接收负载均衡通过ARP协商实现。

配置网卡绑定

查看当前内核是否支持bonding

modinfo bonding

filename:       /lib/modules/3.10.0-693.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
rhelversion:    7.4
srcversion:     3F7A5A65495F3B40F22AEFD
depends:
intree:         Y
vermagic:       3.10.0-693.el7.x86_64 SMP mod_unload modversions
signer:         CentOS Linux kernel signing key
sig_key:        DA:18:7D:CA:7D:BE:53:AB:05:BD:13:BD:0C:4E:21:F4:22:B6:A4:9C
sig_hashalgo:   sha256
parm:           max_bonds:Max number of bonded devices (int)
parm:           tx_queues:Max number of transmit queues (default = 16) (int)
parm:           num_grat_arp:Number of peer notifications to send on failover event (alias of num_unsol_na) (int)
parm:           num_unsol_na:Number of peer notifications to send on failover event (alias of num_grat_arp) (int)
parm:           miimon:Link check interval in milliseconds (int)
parm:           updelay:Delay before considering link up, in milliseconds (int)
parm:           downdelay:Delay before considering link down, in milliseconds (int)
parm:           use_carrier:Use netif_carrier_ok (vs MII ioctls) in miimon; 0 for off, 1 for on (default) (int)
parm:           mode:Mode of operation; 0 for balance-rr, 1 for active-backup, 2 for balance-xor, 3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, 6 for balance-alb (charp)
parm:           primary:Primary network device to use (charp)
parm:           primary_reselect:Reselect primary slave once it comes up; 0 for always (default), 1 for only if speed of primary is better, 2 for only on active slave failure (charp)
parm:           lacp_rate:LACPDU tx rate to request from 802.3ad partner; 0 for slow, 1 for fast (charp)
parm:           ad_select:802.3ad aggregation selection logic; 0 for stable (default), 1 for bandwidth, 2 for count (charp)
parm:           min_links:Minimum number of available links before turning on carrier (int)
parm:           xmit_hash_policy:balance-xor and 802.3ad hashing method; 0 for layer 2 (default), 1 for layer 3+4, 2 for layer 2+3, 3 for encap layer 2+3, 4 for encap layer 3+4 (charp)
parm:           arp_interval:arp interval in milliseconds (int)
parm:           arp_ip_target:arp targets in n.n.n.n form (array of charp)
parm:           arp_validate:validate src/dst of ARP probes; 0 for none (default), 1 for active, 2 for backup, 3 for all (charp)
parm:           arp_all_targets:fail on any/all arp targets timeout; 0 for any (default), 1 for all (charp)
parm:           fail_over_mac:For active-backup, do not set all slaves to the same MAC; 0 for none (default), 1 for active, 2 for follow (charp)
parm:           all_slaves_active:Keep all frames received on an interface by setting active flag for all slaves; 0 for never (default), 1 for always. (int)
parm:           resend_igmp:Number of IGMP membership reports to send on link failure (int)
parm:           packets_per_slave:Packets to send per slave in balance-rr mode; 0 for a random slave, 1 packet per slave (default), >1 packets per slave. (int)
parm:           lp_interval:The number of seconds between instances where the bonding driver sends learning packets to each slaves peer switch. The default is 1. (uint)

modprobe bonding
lssmod |grep "bonding"

bonding               145728  0

  以上信息表名，我们的内核已经支持bonding，后续直接配置即可，目前大多数的操作系统都已经支持网卡绑定了，我们这里就不在过多的描述不支持该操作的服务器如何进行安装了，如果不支持，网上搜个博客看看吧。

操作前规划

物理接口	绑定后的虚拟接口
ens192/ens224	bond0

  当前双网卡的速率都是万兆网。

修改物理网卡配置文件

vim /etc/sysconfig/network-scripts/ifcfg-ens224

DEVICE=ens224
BOOTPROTO=none
MASTER=bond0
SLAVE=yes

vim /etc/sysconfig/network-scripts/ifcfg-ens192

DEVICE=ens192
BOOTPROTO=none
MASTER=bond0
SLAVE=yes

配置虚拟网卡配置文件

vim /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
BONDING_OPTS="mode=0 miimon=100"
BOOTPROTO=none
ONBOOT=yes
BROADCAST=10.240.1.255
IPADDR=10.240.1.1
NETMASK=255.255.0.0
NETWORK=10.240.0.0
USERCTL=no

修改modprobe相关文件

vim /etc/modprobe.d/bonding.conf

alias bond0 bonding
options bonding mode=0 miimon=100

miimon：监控网络链接的频率，单位为毫秒。
mode:配置绑定选用模式。

systemctl restart network

查看绑定后信息

  我们可以发现绑定的虚拟网卡已经启动，并且传输速率为20000Mb/S。

  查看当前网卡绑定信息。