Hybrid firewall for data center security

1. A method for managing firewall requirements related to a

virtualized application by a cloud management entity having a processing engine, comprising:

responsive to determining, by the processing engine, that a virtualized application, associated with a first plurality of application virtual machines and a second plurality of firewall virtual machines, requires an increased number of application virtual machines in the first plurality, instantiating an application virtual machine;

comparing a bandwidth capacity of the required increased number of application virtual machines in the first plurality to a bandwidth capacity of the firewall virtual machines in the second plurality to determine whether a firewall ratio is exceeded by the increased number of application virtual machines; and

responsive to determining, by the processing engine, that the firewall ratio is exceeded, instantiating a firewall virtual machine.

2. The method of claim 1 , wherein the firewall ratio threshold is included in an application profile configured at deployment of the virtualized application.

3. The method of claim 1 , further including the step of comparing the required increased number of application virtual machines to the number of firewall virtual machines in the second plurality.

4. The method of claim 1 , further including the steps of:

computing a ratio of the required increased number of application virtual machines to the number of firewall virtual machines in the second plurality; and

comparing the computed ratio with a firewall ratio requirement associated with the virtualized application.

5. The method of claim 1 , further including the step of comparing a bandwidth capacity of the required increased number of application virtual machines in the first plurality to a sum of a bandwidth capacity of the firewall virtual machines in the second plurality and a bandwidth of a hardware firewall provisioned for use by the virtualized application.

6. The method of claim 1 , wherein the virtualized application is hosted on the first plurality of application virtual machines and the second plurality of firewall virtual machines provide firewalling services for traffic associated with the virtualized application.

7. The method of claim 1 , further including the steps of adding the instantiated application virtual machine to the first plurality; and adding the instantiated firewall virtual machine to the second plurality.

8. The method of claim 1 , further including responsive to determining that an increased number of load balancing virtual machines is required by the increased number of application virtual machines, instantiating a load balancing virtual machine.

9. The method of claim 1 , further including the steps of:

determining that the virtualized application requires a decreased number of application virtual machines in the first plurality;

determining that a decreased number of firewall virtual machines is required by the decreased number of application virtual machines;

shutting down an application virtual machine; and

shutting down a firewall virtual machine.

10. A cloud management entity, comprising:

a memory for storing instructions; and

a processing engine, configured to execute the instructions, for, responsive to

determining that a virtualized application, associated with a first plurality of application virtual machines and a second plurality of firewall virtual machines, requires an increased number of application virtual machines in the first plurality, instantiating an application virtual machine; for comparing a bandwidth capacity of the required increased number of application virtual machines in the first plurality to a bandwidth capacity of the firewall virtual machines in the second plurality to determine whether a firewall ratio is exceeded by the increased number of application virtual machines; and for, responsive to determining that the firewall ratio is exceeded, instantiating a firewall virtual machine.

11. The cloud management entity of claim 10 , further comprising a communication interface for communicating with the first plurality of application virtual machines and the second plurality of firewall virtual machines.

12. The cloud management entity of claim 10 , wherein the firewall ratio threshold is included in an application profile configured at deployment of the virtualized application by the processing engine.

13. The cloud management entity of claim 10 , wherein the processing engine compares the required increased number of application virtual machines in the first plurality to the number of firewall virtual machines in the second plurality.

14. The cloud management entity of claim 10 , wherein the processing engine computes a ratio of the required increased number of application virtual machines in the first plurality to the number of firewall virtual machines in the second plurality; and compares the computed ratio to a firewall ratio threshold associated with the virtualized application.

15. The cloud management entity of claim 10 , wherein the processing engine compares a bandwidth capacity of the increased number of application virtual machines in the first plurality to a sum of a bandwidth capacity of the firewall virtual machines in the second plurality and a bandwidth capacity of a hardware firewall provisioned for use by the virtualized application.

16. The cloud management entity of claim 10 , wherein the virtualized application is hosted on the first plurality of application virtual machines and the second plurality of firewall virtual machines provide firewalling services for traffic associated with the virtualized application.