Introduction to Virtualization

What if we need to deploy virtualization applications in a large scale in the production environment? Xen and KVM support real-time migration, so virtualization is in the production environment. Faced with some problems? It is very useful to provide solutions, especially when our sessions or other mechanisms cannot be interrupted. For example, for Web Services, we build Web Services on xen, when a host fault occurs on the xen itself, it can be directly migrated to other hosts in real time. The services provided in the middle will not be affected. Therefore, virtualization-based solutions are increasingly common for many enterprises. The real-time migration of virtualization requires automatic migration. When any physical host fails, it is automatically migrated to another host. Under what circumstances does a resource or service process have this function? How can we ensure that the resources running on a physical host are migrated to other nodes when a fault occurs. In highly available environments.

In fact, compared to our entire service or KVM \ Zen, we can install and provide a so-called qtk or other service on the xen Virtual Machine to monitor the xen host running on the current host at any time, once the VM monitors the VM instance, other nodes cannot receive heartbeat information, and the xen is automatically redirected to other nodes. This is achieved by using the high-availability underlying functions.

For example, if we have 50 servers, we want

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Introduction to Virtualization