linux双网卡热备配置超详细（linux 使用bond实现双网卡绑定单个IP的示例代码）

#加载bonding模块，并确认已经加载
[root@web01 ~]# modprobe --first-time bonding
[root@web01 ~]# lsmod | grep bonding
bonding        141566 0 
#编辑bond1配置文件
[root@web01 ~]# cat > /etc/sysconfig/network-scripts/ifcfg-bond1 << EOF
> DEVICE=bond1
> TYPE=Bond
> IPADDR=192.168.171.111
> NETMASK=255.255.255.0
> GATEWAY==192.168.171.2
> DNS1=114.114.114.114
> DNS2=8.8.8.8
> USERCTL=no
> BOOTPROTO=none
> ONBOOT=yes
> EOF
#修改ens33配置文件
[root@web01 ~]# cat > /etc/sysconfig/network-scripts/ifcfg-ens33 << EOF
> DEVICE=ens33
> TYPE=Ethernet
> ONBOOT=yes
> BOOTPROTO=none
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=no
> NMAE=ens33
> MASTER=bond1        # 需要和上面的ifcfg-bond0配置文件中的DEVICE的值一致
> SLAVE=yes
> EOF
#修改ens36配置文件
[root@web01 ~]# cat > /etc/sysconfig/network-scripts/ifcfg-ens33 << EOF
> DEVICE=ens36
> TYPE=Ethernet
> ONBOOT=yes
> BOOTPROTO=none
> DEFROUTE=yes
> IPV4_FAILURE_FATAL=no
> NAME=ens36
> MASTER=bood1
> SLAVE=yes
> EOF

# 配置bonding
[root@web01 ~]# cat >> /etc/modules-load.d/bonding.conf << EOF
> alias bond1 bonding
> options bonding mode=1 miimon=200      # 加载bonding模块，对外虚拟网络接口设备为 bond1
> EOF

#重启网卡使配置生效
[root@web01 ~]# systemctl restart network

[root@web01 ~]# ip a show ens33
2: ens33: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond1 state UP group default qlen 1000
  link/ether 00:0c:29:9f:33:9f brd ff:ff:ff:ff:ff:ff
[root@web01 ~]# ip a show ens36
3: ens36: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond1 state UP group default qlen 1000
  link/ether 00:0c:29:9f:33:9f brd ff:ff:ff:ff:ff:ff
[root@web01 ~]# ip a show bond1
7: bond1: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
  link/ether 00:0c:29:9f:33:9f brd ff:ff:ff:ff:ff:ff
  inet 192.168.171.111/24 brd 192.168.171.255 scope global noprefixroute bond1
    valid_lft forever preferred_lft forever
  inet6 fe80::20c:29ff:fe9f:339f/64 scope link 
    valid_lft forever preferred_lft forever

#查看bond1的接口状态
[root@web01 ~]# cat /proc/net/bonding/bond1        
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: load balancing (round-robin)      # 绑定模式
MII Status: up      # 接口状态
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: ens33       # 备用接口: ens33
MII Status: up        # 接口状态
Speed: 1000 Mbps         # 端口速率
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:9f:33:9f       # 接口永久MAC地址
Slave queue ID: 0

Slave Interface: ens36      # 备用接口: ens36
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:9f:33:a9
Slave queue ID: 0