Realizing multiple network card binding in Linux system in practice

Introduction

For servers, the stability of network equipment is also important, especially network cards. In production systems, the reliability of the network card is even more important. Multiple network cards are bound to one IP address. When one network card is physically damaged, the other network card is automatically enabled and provides normal services That is: by default, only one network card works, and other network cards serve as backup network cards to provide redundant support.

Highly efficient overlay network transmission rate, load balancing

Network load balancing is commonly used in file servers. For example, three network cards are used as one to solve the problem of excessive traffic and excessive pressure on the server network for one IP address.

For file servers, such as NFS or SAMBA file servers, no administrator will create multiple IP addresses for the file servers on the intranet to solve the network load problem. If the file server is on an intranet, most of the file servers use the same IP address for the convenience of management and application. For a local network of 100M, the network pressure is extremely high when the file server is used by multiple users at the same time, especially SAMABA and NFS servers. In order to solve the problem of using the same IP address and breaking through traffic restrictions, after all, network cables and network cards have limits on data throughput. If you have limited resources, implement network load balancing.

Steps:
1. First set up 2 network cards for the virtual machine:

2. Close NetworkManager in the system:

3. Edit the file /etc/modprobe.d/dist.conf and add alias bond0 bonding:

4. Modify ifcfg-eth0 ifcfg-eth1 in /etc/sysconfig/network-scripts and create bond0:

miimon refers to how often to check the network, the unit is ms (milliseconds)
mode=0: Balanced load mode, both network cards are working, load balancing.
mode=1: automatic active and backup mode, one of the network cards is working (if eth0 is disconnected)

will automatically switch to another block network card (eth1 as backup) Experimental results:

1. Restart the network. service network restart, or computer.
2. Use another virtual machine to ping the host to which the network card is bound.
3. If you ipdown any network card, network communication will not be affected.

Original article from: https://www.linuxprobe.com/ethernet-channel-bonding.html

Original address of this article: https://www.linuxprobe.com/ethernet-channel-bonding.htmlEditor: Liu Xun, auditor: None

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