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Abiquo 2.3


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What is a Virtual Datacenter

A virtual datacenter is an abstraction of a physical datacenter that offers the same capabilities (such as computing power, network infrastructure, external storage system, backup, security, etc) with the advantages of cloud computing technology:

  • Virtualization
  • Pay-as-you-go billing
  • Quickly scalability
  • Technology and hardware abstraction.

This allows cloud users to run their applications in a more economical and flexible way. A virtual datacenter offers datacenter infrastructure as a service. With Abiquo, it is easy to create, manage and configure virtual datacenters from the Virtual Datacenters view.

If you have permission to manage virtual datacenters, from the Virtual Datacenters view you can:

Button Action
Create a new Virtual Datacenter
Remove an existing Virtual Datacenter
Edit the selected Virtual Datacenter

Creating a Virtual Datacenter

API Documentation

For the Abiquo API documentation of this feature, see Abiquo API Resources and the page for this resource VirtualDatacenterResource.

To create a new virtual datacenter, click the button and complete the form:

Creating Virtual Datacenter Networks

Abiquo offers these types of virtual datacenter networks (VLANs):

  • public networks: with Internet addressable public IP addresses.
  • external networks: assigned to an enterprise and can be accessed by more than one virtual datacenter.
  • unmanaged networks: receive their IP addresses outside of Abiquo.
  • private networks: with private IP addresses and restricted to a single virtual datacenter.

External and private VLANs can be the default for a virtual datacenter and for an enterprise. When you create a virtual datacenter, its default network will be your enterprise's default. This can be the automatically-created private VLAN, named "default_network", or an external VLAN, set as the default in Users view.

If you wish to override the default network for your virtual datacenter, you will need to create a new custom private network to be the default. After you create the virtual datacenter, you can change the default network; see Manage Networks.

 

Creating a Virtual Datacenter with a Custom Private Network

Select the Custom option in Private Network configuration and complete this form.

You can manage the VLANs of your virtual datacenter in the Network tab; See Manage Networks.

Allocation Limits Management

The allocation limits tab allows the administrator to limit the amount of physical and virtual resources a virtual datacenter may consume. This is very useful in preventing common problems on cloud platforms, including resource over allocation, virtual datacenters allocating resources from other virtual datacenters, and DoS attacks. Allocation limits also help system administrators to anticipate user needs and to forecast resource demands.

The cloud administrator can set the allocation limits for enterprises and then the enterprise administrator can set allocation limits for virtual datacenters.

Hard and Soft Limits
  • Hard Limit: The maximum amount of virtual resources (RAM, virtual CPU, local hard disk, external storage, VLANs and public IPs) that a virtual datacenter will be allowed to consume.
  • Soft Limit: This limit is always lower than the hard limit and it is used to alert users. When a virtual datacenter reaches the soft limit, users will see a warning that they are reaching the resource allocation limits for their virtual datacenter.

To manage the virtual datacenter allocation limits, click the Allocation Limits tab when creating your virtual datacenter and you will see the following panel:

The default configuration is with all limits set to 0, as shown above. It means that the virtual datacenter will have *no soft or hard limits*. However, there may *enterprise* hard or soft limits set for users too. If both virtual datacenter and enterprise limits are set to 0, then the only limits will be the actual resources available in the datacenter, rack and physical machine.

After you complete the allocation limits form, Abiquo will create the *virtual datacenter* and the associated VLAN and display it in the [Virtual Datacenters View].

After you complete the form, Abiquo will create the virtual datacenter and the associated VLAN and display it in the Virtual Datacenters View.

Hard and Soft Limit Messages

The following configuration shows some soft and hard limits for a very small virtual datacenter. As you can see, the soft limit is just one virtual CPU and the hard limit is 4 virtual CPUs.

Hard and Soft Limits

  • Remember that soft limits must be always lower than hard limits.
  • Limits equal to 0 means that there is no limit to resource usage.
Soft Limit Messages

If you try to deploy a virtual appliance with more than one CPU in this virtual datacenter, then the soft limits will be exceeded. You will see a pop-up that will allow you to to acknowledge the message and continue with the operation.

There are two types of soft limit messages, depending on the soft limit details message option on the General page of Configuration View 

If the soft limit details message option is selected on the General page of Configuration View, you will see this message.

 

If the soft limit details option is not selected, you will see a general message.

 

It is also possible to receive this message when enterprise soft limits have been reached or exceeded but virtual datacenter soft limits have not.

Hard Limit Messages

If you try to deploy a virtual appliance with more than four CPUs in this virtual datacenter, then the hard limits will be exceeded. You will see a pop-up that will allow you to to acknowledge the message and terminate the operation.

There are two types of hard limit messages, depending on the hard limit details message option on the General page of Configuration View 

If the hard limit details message option is selected on the General page of Configuration View, you will see this message.

 

If the soft limit details option is not selected, you will see a general message.

 

It is also possible to receive this message when enterprise hard limits have been exceeded but virtual datacenter hard limits have not been exceeded.

 

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