Detailed explanation of dual network card master and backup mode configuration under CentOS

1 Brief description

Set the active and backup mode through dual network cards, so that when one network card fails, the other network card can automatically replace the failed network card to ensure normal network access.

2 Implementation

2.1. View network card information

Execute ifconfig -a command

2.2. Modify the network card configuration file

Switch working directory

cd /etc/sysconfig/network-scripts/

Modify the network card configuration file ifcfg-eth0 and ensure that the following contents are correct:

TYPE=Ethernet

BOOTPROTO=dhcp

ONBOOT=yes

MASTER=bond0

SLAVE=yes

Modify the network card configuration file ifcfg-eth1. If it is not created, ensure that the following contents are correct (same as above):

DEVICE=eth1

TYPE=Ethernet

BOOTPROTO=dhcp

ONBOOT=yes

MASTER=bond0

SLAVE=yes

2.3. Virtual network card file configuration

Create a file

touch ifcfg-bond0

Edit the file and add the following content:

DEVICE=bond0

TYPE= Ethernet

ONBOOT=yes

BOOTPROTO=none

IPADDR="192.168.137.243"

NETMASK="255.255.255.0"

GATEWAY="192.168.137.1"

DNS="192.168.137.1"

NAME=bond0

BONDING_OPTS=”miimon=100 mode=1”

Note: If BONDING_OPTS is in a virtual machine, you need to add fail_over_mac=1 such as BONDING_OPTS=”miimon=100 mode=1 fail_over_mac=1”

The following items should be set according to the network environment:

IPADDR="192.168.137.243"

NETMASK="255.255.255.0"

GATEWAY="192.168.137.1"

DNS="192.168.137.1"

PREFIX=24

2.4. Restart the service

implement :

service network restart

Or reboot to restart the server

2.5. Check status

ifconfig

View active and backup information:

2.6. Test

Close the network card eth0

ifconfig eth0 down

Ping the ip to see if it can be connected.

Check whether the primary and secondary switches are switched:

Finish

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