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This article mainly introduces "how to set up Linux virtual network for KVM". In daily operation, I believe many people have doubts about how to set up Linux virtual network for KVM. Xiaobian consulted all kinds of information and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how to set up Linux virtual network for KVM"! Next, please follow the small series to learn together!

One of the most complex aspects of virtual hardware in KVM virtual environments is setting up virtual networks. In this article, Sander van Vugt, a contributing expert at TechTarget China, explains how to set up network interfaces.

There are two things to consider when configuring virtual networks. First, configure the physical network card in the host operating system. Then configure the virtual network interface in the virtual machine.

Comparison of physical and virtual network configurations

Before you start configuring virtual networks, you need to determine what you want to configure. In modern networks, there are many different configurations because servers are usually equipped with several network cards. The fact that your server has more network cards raises *** important questions: Would you use these cards to add performance and redundancy to a NIC aggregation configuration? Or do you want to configure network cards individually so that you can assign a virtual machine to a virtual network?

There are good reasons to prefer either approach. If the workload on one or both virtual machines does not show significant network I/O, the *** way to configure the virtual network may be by setting up NIC bonding configurations in the host operating system. Most Linux distributions provide solutions for such environments. The upshot is that instead of using a separate network card, you can only use one network interface, bond0. On top of the bond0 interface, you can create virtual bridge interfaces (which behave like real switches). All individual virtual machines will then use the ports on this virtual bridge, with no priority for any virtual machine.

The advantage of this approach is that the host operating system can assign equal priority to the available virtual machines. At the same time, network binding interfaces ensure that redundancy exists in the network. If one interface in the bonding environment crashes, other interfaces can take over its work, ensuring network continuity.

manual priority assignment

You can choose not to bind the physical network interface to a large bound device in the host operating system. This approach also provides the advantage that you can manually decide which virtual network card will be used by which virtual machine. Suppose you have four virtual machines in your environment, but one of them causes a fairly high workload. In this case, you *** use two (or more) different network interfaces. What you need to do is configure bridges on each interface and assign one interface specifically for virtual machines that require high bandwidth, and assign all other virtual machines to other interfaces. This approach allows you to manually Load Balancer virtual machines across the network.

You should also configure the network in the virtual machine. Nothing stops you from creating network bound devices in virtual machines. From a more practical point of view, this is not a good idea. If you configure the network on the host, all virtual machines can use this configuration. If you configure networking in virtual machines, you should need to repeat the network configuration process for each virtual machine.

KVM Network Settings *** Tips

When setting up a KVM network, you can configure a benefit network card in a server in a network-bound device that communicates with the network bridge. This is a good idea if the virtual machine you want to use on the host has similar requirements for network bandwidth usage. If the bandwidth requirements of virtual machines vary significantly, *** create multiple virtual bridges so that machines with high bandwidth requirements have dedicated network bridges.

At this point, the study of "how to set up Linux virtual network for KVM" is over, hoping to solve everyone's doubts. Theory and practice can better match to help you learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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