bonding介绍
bonding(绑定)是一种linux系统下的网卡绑定技术，可以把服务器上n个物理网卡在系统内部抽象(绑定)成一个逻辑上的网卡，能够提升网络吞吐量、实现网络冗余、负载等功能，有很多优势。bonding技术是linux系统内核层面实现的，它是一个内核模块(驱动)。使用它需要系统有这个模块, 我们可以modinfo命令查看下这个模块的信息, 一般来说都支持.
bonding的七种模式
bonding技术提供了七种工作模式，在使用的时候需要指定一种，每种有各自的优缺点.
balance-rr (mode=0) 默认, 有高可用 (容错) 和负载均衡的功能, 需要交换机的配置，每块网卡轮询发包 (流量分发比较均衡).
active-backup (mode=1) 只有高可用 (容错) 功能, 不需要交换机配置, 这种模式只有一块网卡工作, 对外只有一个mac地址。缺点是端口利用率比较低
balance-xor (mode=2) 不常用
broadcast (mode=3) 不常用
802.3ad (mode=4) IEEE 802.3ad 动态链路聚合，需要交换机配置，没用过
balance-tlb (mode=5) 不常用
balance-alb (mode=6) 有高可用 ( 容错 )和负载均衡的功能，不需要交换机配置 (流量分发到每个接口不是特别均衡)
centos7.5 配置bonding
- 查看UP的网卡口
[root@t71 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp61s0f2: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 08:94:ef:65:3a:9a brd ff:ff:ff:ff:ff:ff
3: enp61s0f3: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 08:94:ef:65:3a:9b brd ff:ff:ff:ff:ff:ff
4: enp175s0f0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP group default qlen 1000
link/ether e8:61:1f:13:71:44 brd ff:ff:ff:ff:ff:ff
5: enp175s0f1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP group default qlen 1000
link/ether e8:61:1f:13:71:44 brd ff:ff:ff:ff:ff:ff
6: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether e8:61:1f:13:71:44 brd ff:ff:ff:ff:ff:ff
inet 192.168.4.71/22 brd 192.168.7.255 scope global bond0
valid_lft forever preferred_lft forever
inet6 fe80::ea61:1fff:fe13:7144/64 scope link
valid_lft forever preferred_lft forever
[root@t71 ~]#
这是配置bonding完成之后的情况。但是在配置之前，也可以看到enp175s0f0和enp175s0f1处于UP状态
- 修改/etc/sysconfig/network-scripts/ifcfg-enp175s0f0和/etc/sysconfig/network-scripts/ifcfg-enp175s0f1文件，具体修改内容如下：
DEVICE=enp175s0f0 # ifcfg-enp175s0f1文件对应的位置修改为enp175s0f1
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
- 创建bond文件:在/etc/sysconfig/network-scripts/创建文件ifcfg-bond0,具体内容如下：
DEVICE=bond0
TYPE=Bond
BOOTPROTO=none
USERCTL=no
IPADDR=192.168.4.74
NETMASK=255.255.252.0
GATEWAY=192.168.7.254
BONDING_OPTS="mode=4 miimon=100" #起初使用的是mode=6,后面修改为mode=4,需要添加具体配置
ONBOOT=yes
BONDING_MASTER=yes
- 加载bonding模块
modprobe bonding
- 查看bonding模块加载情况
[root@t74 ~]# lsmod | grep bonding
bonding 149864 0
[root@t74 ~]#
- 关闭NetworkManager
systemctl stop NetworkManager
systemctl disable NetworkManager
- 重启network服务
systemctl restart network
- 查看配置情况
[root@t74 ~]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer2 (0)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
802.3ad info
LACP rate: slow
Min links: 0
Aggregator selection policy (ad_select): stable
System priority: 65535
System MAC address: e8:61:1f:26:e5:78
Active Aggregator Info:
Aggregator ID: 1
Number of ports: 2
Actor Key: 15
Partner Key: 833
Partner Mac Address: 34:a2:a2:7a:5b:c0
Slave Interface: enp24s0f0
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: e8:61:1f:26:e5:78
Slave queue ID: 0
Aggregator ID: 1
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
system priority: 65535
system mac address: e8:61:1f:26:e5:78
port key: 15
port priority: 255
port number: 1
port state: 61
details partner lacp pdu:
system priority: 32768
system mac address: 34:a2:a2:7a:5b:c0
oper key: 833
port priority: 32768
port number: 6
port state: 61
Slave Interface: enp24s0f1
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: e8:61:1f:26:e5:79
Slave queue ID: 0
Aggregator ID: 1
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
system priority: 65535
system mac address: e8:61:1f:26:e5:78
port key: 15
port priority: 255
port number: 2
port state: 61
details partner lacp pdu:
system priority: 32768
system mac address: 34:a2:a2:7a:5b:c0
oper key: 833
port priority: 32768
port number: 5
port state: 61
因为选用的mode=4模式，所以需要进一步配置交换机，使用的交换机为华为S6720 具体配置如下：
system-view
interface eth-trunk 1
port link-type trunk
port trunk allow-pass vlan 10
mode lacp
trunkport XGigabitEthernet 0/0/1 to 0/0/2 #将交换机上的端口1和2聚合到trunk 1中
具体命令的作用，目前我也说不清楚，但是这样配置可以正常工作。不过经测试，io的能力并没有提高，这个问题仍需进一步关注
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