Centos 7 双网卡绑定，主备工作状态

深藏阁楼爱情的钟 2023-07-25 05:25 12阅读 0赞

## 介绍： ##

系统版本：
    [root@localhost ~]# cat /etc/redhat-release 
    CentOS Linux release 7.6.1810 (Core)
    
    网卡eth0初始配置：
    [root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
    TYPE=Ethernet
    BOOTPROTO=static
    NAME=eth0
    DEVICE=eth0
    ONBOOT=yes
    IPADDR=192.168.14.211
    PREFIX=24
    GATEWAY=192.168.14.254
    DNS1=10.1.2.30
    DNS2=114.114.114.114
    
    网卡eth1初始配置：
    [root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
    TYPE=Ethernet
    BOOTPROTO=static
    NAME=eth1
    DEVICE=eth1
    ONBOOT=yes
    IPADDR=192.168.14.215
    PREFIX=24
    GATEWAY=192.168.14.254
    DNS1=10.1.2.30
    DNS2=114.114.114.114

## 一、配置双网卡主备 ##

1、关闭 NetworkManager服务

[root@localhost ~]# systemctl stop  NetworkManager
    [root@localhost ~]# systemctl disable  NetworkManager

2、添加bond0

[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-bond0 
    TYPE=Bond
    DEVICE=bond0
    IPADDR=192.168.14.220
    PREFIX=24
    BONDING_OPTS=mode=active-backup
    NAME=bond0
    ONBOOT=yes

3、修改eth0

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
    TYPE=Ethernet
    BOOTPROTO=static
    NAME=eth0
    DEVICE=eth0
    ONBOOT=yes
    IPADDR=192.168.14.211
    PREFIX=24
    GATEWAY=192.168.14.254
    DNS1=10.1.2.30
    DNS2=114.114.114.114
    MASTER=bond0                #新增
    SLAVE=yes                   #新增

4、修改eth1

[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
    TYPE=Ethernet
    BOOTPROTO=static
    NAME=eth1
    DEVICE=eth1
    ONBOOT=yes
    IPADDR=192.168.14.215
    PREFIX=24
    GATEWAY=192.168.14.254
    DNS1=10.1.2.30
    DNS2=114.114.114.114
    MASTER=bond0                #新增
    SLAVE=yes                   #新增

5、重启网卡

[root@localhost ~]# systemctl restart network

6、查看状态

[root@localhost ~]# cat /proc/net/bonding/bond0 
    Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
    
    Bonding Mode: fault-tolerance (active-backup)
    Primary Slave: None
    Currently Active Slave: eth0
    MII Status: up
    MII Polling Interval (ms): 0
    Up Delay (ms): 0
    Down Delay (ms): 0
    
    Slave Interface: eth0
    MII Status: up
    Speed: 1000 Mbps
    Duplex: full
    Link Failure Count: 0
    Permanent HW addr: 00:0c:29:08:01:5d
    Slave queue ID: 0
    
    Slave Interface: eth1
    MII Status: up
    Speed: 1000 Mbps
    Duplex: full
    Link Failure Count: 0
    Permanent HW addr: 00:0c:29:08:01:67
    Slave queue ID: 0

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70][]

7、添加临时默认路由（永久路由自行添加配置文件）

[root@localhost ~]# route add -net 0.0.0.0/0 gw 192.168.14.254 dev bond0

## 二、模拟生产环境网卡故障 ##

1、关闭eth0主网卡模拟故障，eth1从备转为主

[root@localhost ~]# ifdown eth0

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 1][]

2、故障网卡eth0恢复之后并不会抢占eth1，从而避免网络波动

[root@localhost ~]# ifup eth0

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70]: /images/20230528/5141c2d1e6f5466cb8b24e02c443e161.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 1]: /images/20230528/548de7aa19f0476bb26bee4841a0b112.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 2]: /images/20230528/46cd1367980843b6abb2aab8701e13be.png