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 55阅读 0赞

介绍：

  1. 系统版本：
  2. [root@localhost ~]# cat /etc/redhat-release 
  3. CentOS Linux release 7.6.1810 (Core)
  5. 网卡eth0初始配置：
  6. [root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
  7. TYPE=Ethernet
  8. BOOTPROTO=static
  9. NAME=eth0
  10. DEVICE=eth0
  11. ONBOOT=yes
  12. IPADDR=192.168.14.211
  13. PREFIX=24
  14. GATEWAY=192.168.14.254
  15. DNS1=10.1.2.30
  16. DNS2=114.114.114.114
  18. 网卡eth1初始配置：
  19. [root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
  20. TYPE=Ethernet
  21. BOOTPROTO=static
  22. NAME=eth1
  23. DEVICE=eth1
  24. ONBOOT=yes
  25. IPADDR=192.168.14.215
  26. PREFIX=24
  27. GATEWAY=192.168.14.254
  28. DNS1=10.1.2.30
  29. DNS2=114.114.114.114

一、配置双网卡主备

1、关闭 NetworkManager服务

  1. [root@localhost ~]# systemctl stop  NetworkManager
  2. [root@localhost ~]# systemctl disable  NetworkManager

2、添加bond0

  1. [root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-bond0 
  2. TYPE=Bond
  3. DEVICE=bond0
  4. IPADDR=192.168.14.220
  5. PREFIX=24
  6. BONDING_OPTS=mode=active-backup
  7. NAME=bond0
  8. ONBOOT=yes

3、修改eth0

  1. [root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
  2. TYPE=Ethernet
  3. BOOTPROTO=static
  4. NAME=eth0
  5. DEVICE=eth0
  6. ONBOOT=yes
  7. IPADDR=192.168.14.211
  8. PREFIX=24
  9. GATEWAY=192.168.14.254
  10. DNS1=10.1.2.30
  11. DNS2=114.114.114.114
  12. MASTER=bond0                #新增
  13. SLAVE=yes                   #新增

4、修改eth1

  1. [root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
  2. TYPE=Ethernet
  3. BOOTPROTO=static
  4. NAME=eth1
  5. DEVICE=eth1
  6. ONBOOT=yes
  7. IPADDR=192.168.14.215
  8. PREFIX=24
  9. GATEWAY=192.168.14.254
  10. DNS1=10.1.2.30
  11. DNS2=114.114.114.114
  12. MASTER=bond0                #新增
  13. SLAVE=yes                   #新增

5、重启网卡

  1. [root@localhost ~]# systemctl restart network

6、查看状态

  1. [root@localhost ~]# cat /proc/net/bonding/bond0 
  2. Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
  4. Bonding Mode: fault-tolerance (active-backup)
  5. Primary Slave: None
  6. Currently Active Slave: eth0
  7. MII Status: up
  8. MII Polling Interval (ms): 0
  9. Up Delay (ms): 0
  10. Down Delay (ms): 0
  12. Slave Interface: eth0
  13. MII Status: up
  14. Speed: 1000 Mbps
  15. Duplex: full
  16. Link Failure Count: 0
  17. Permanent HW addr: 00:0c:29:08:01:5d
  18. Slave queue ID: 0
  20. Slave Interface: eth1
  21. MII Status: up
  22. Speed: 1000 Mbps
  23. Duplex: full
  24. Link Failure Count: 0
  25. Permanent HW addr: 00:0c:29:08:01:67
  26. Slave queue ID: 0

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7、添加临时默认路由（永久路由自行添加配置文件）

  1. [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

  1. [root@localhost ~]# ifdown eth0

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2、故障网卡eth0恢复之后并不会抢占eth1，从而避免网络波动

  1. [root@localhost ~]# ifup eth0

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