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When migrating from physical infrastructure to virtual infrastructure, the virtual environment should be designed and laid out to mimic physical practices, enterprise-class virtualization software allows virtual switches to be created, virtual local area network (VLANS) and Private Cloud can assist in the migration, analyze physical and logical network maps, and replicate all channels and traffic flows.

A common way to use virtual machine technology is to wrap these guest operating systems (with applications) in ISO or other module images that can be deployed sequentially as server arrays as virtual guests.

Virtualization is about handing workloads off to virtual machines, and the most frequently asked question about virtualization is virtual machine performance, so most of the tips presented in this article are related to enhancing virtual machine performance, enhancing user experience, and reducing problems with traditional physical systems, while the rest are related to virtualization best practices for medium and large environments, and while those smaller environments will benefit from these tips, they will only be available if the number of virtual machines increases to 50 or more The advantages of these skills will really be reflected.

VM is the best choice to build honeypots, first create VMs based on templates, and then implement isolation, which is the best way to study threats to production systems, disable network interfaces when dealing with viruses or malware, so that threats remain within the VM, do not affect other systems (virtual or physical), when using Windows VM, please turn off the system restore function, ensure that files are modified or destroyed, the system will not automatically restore. Virtual machine templates allow virtualization administrators to quickly deploy new virtual machines using standard operating system images, templates are equivalent to golden images, virtual machines created based on templates can continue to install new patches, and new virtual machines can be converted to templates again.

Virtual hosts must use 64-bit multiprocessors, sufficient RAM and disk space for VMs, Gigabit network interfaces are also required, it is best to use multiple network interfaces, use separate interfaces for backup and virtual machine communication, most servers can meet these requirements, if using older servers, make sure the processor is 64-bit, and support multiple processors, RAM should be able to expand to a minimum of 8GB, 8GB is considered to be the minimum memory limit for building a VM host.

Time synchronization, time offset and network time are the biggest headaches for system and virtual administrators. Network Time Protocol (NTP) solves the problem of system time synchronization through third-party independent sources. There are many ways for clients and host hosts to synchronize, such as installing client plug-ins that allow time synchronization.(Click "Install Virtualization Tools * Enhanced * Client Plugins"), but synchronization can also be performed at the guest OS level, and the following example shows how to perform client (Linux) to host (Xen) synchronization.

When provisioning a new VM or creating a new disk for a VM, dense provisioning uses a static approach to allocating space to virtual disks if virtualization is important or disk contents change frequently, if you create a 30GB virtual disk it takes up 30GB of storage space, as opposed to thin provisioning, which means you can dynamically expand the virtual disk size, thin provisioning uses minimal space to create virtual disks, And then automatically scale up according to the needs of data growth, thin provisioning saves disk space, but performance is not good. Therefore, the rule of thumb for dense versus thin provisioning is: dense provisioning is recommended if your virtual disks require optimal performance or data writes are frequent.

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