Virtual machines and vApp

A virtual machine (VM) is a virtual computer consisting of a processor, memory, disks, and network adapters. You can install operating systems of the Windows, Linux, etc. on a virtual machine, as well as on a physical server. Unlike a physical server, a virtual machine is not tied to specific equipment and uses part of the shared resources.

VMs are created in the vApp container. One vApp can have multiple VMs. vApp allows you to combine VMs into groups, which in turn simplifies administration. For example, you can create one vApp for a test environment and another for a productive one. In this case, you will have the opportunity to isolate them using different networks. All VMs inside vApp can be turned on or off with one button.

There are two ways to create a VM:

— Using the template
It is enough to select a template with the desired OS from the catalog and determine the amount of resources that will be allocated to this VM. The VM will be automatically deployed and configured. VM templates with popular OS are available in the Public Catalogs section.

— Configure VM manually
When you create a VM from scratch, you have more options for customization and configuration. You can create an empty VM, which will contain only the parameters of the future VM, and separately load your own OS image.

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business challenge

The customer faced a technical issue with a persistent BGP session flag with Linxdatacenter hardware. We examined the problem and found out that one of customer’s hosts was under a DDoS attack.

Because of the distributed nature of the attack, traffic couldn’t be filtered effectively, and disconnecting the host from the external network wasn’t an option. The attack stopped after changes in the server configuration, but resumed the day after. A 5.5 Gbps attack overloaded the junctions with internet providers, affecting other Linx Cloud users. To mitigate the effects of the attack, we employed a dedicated DDoS protection service.


To ensure the continuous availability of resources hosted in Linx Cloud, we rerouted all the customer’s traffic through StormWall Anti-DDoS system. The attack was stopped within half an hour. To prevent future cyberattacks, we organized all connections to the customer’s resources through the StormWall network.

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