CentOS7 Network Adapter Bonding Configuration Guide

NIC (Network Interface Card) bonding is also called network bonding. It can be defined as an aggregation or combination of multiple NICs to a single key interface. Its main purpose is to provide high availability and redundancy.

Experimental environment: DELL CentOS 7

Dual network card: em1/em2

# Check the network card name

ip link | awk 'NR%2==1' | awk '{print $2,$8,$9}' | tr -d ':' | grep -v lo | awk '{print $1}'

prerequisites

Confirm whether the bonding module has been loaded into the Linux environment, use the following command to load it:

modprobe bonding

List bound module information

modinfo bonding

Step one: Create binding interface file

Create the bonding interface file (ifcfg-bond0) under the folder "/etc/sysconfig/network-scripts/"

[root@kvm-centos7 ~]# cd /etc/sysconfig/network-scripts/

[root@kvm-centos7 network-scripts]# cat ifcfg-bond0

DEVICE=bond0

TYPE=Bond

NAME=bond0

BONDING_MASTER=yes

BOOTPROTO=none

ONBOOT=yes

IPADDR=192.168.1.133

NETMASK=255.255.255.0

GATEWAY=192.168.1.1

BONDING_OPTS="mode=5 miimon=100"Use 'mode = 5' to provide fault tolerance and load balancing

Step 2: Edit the NIC interface file (ifcfg-em1, ifcfg-em2)

[root@kvm-centos7 network-scripts]# clear

[root@kvm-centos7 network-scripts]# cat ifcfg-em1

TYPE=Ethernet

BOOTPROTO=none

UUID=f6f140af-1885-47d6-b22f-51e232d966e9

DEVICE=em1

ONBOOT=yes

MASTER=bond0

SLAVE=yes

[root@kvm-centos7 network-scripts]# cat ifcfg-em2

UUID=fe4606d1-23b8-48c7-a7e0-c858978ba4a9

DEVICE=em2

ONBOOT=yes

TYPE=Ethernet

BOOTPROTO=none

MASTER=bond0

SLAVE=yes

Step 3: Restart the network service

systemctl restart network.service

Step 4: Test and verify bond interface

Use ipconfig to check the network card status

View bonding interface settings, such as bonding mode and slave interface

cat /proc/net/bonding/bond0

Step 5: Fault Tolerance Test

Test fault tolerance, stop a network card to see if the server can be accessed and the interface status

ifdown em1 #Disable

ifconfig checks the network status and finds that the network status is normal

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