Ordering of interface adapters in virtual machines

1. A computing device, comprising:

a hardware processor; and

a machine-readable storage medium storing instructions, the instructions executable by the hardware processor to:

initiate a virtual machine (VM) using a user specification including a plurality of virtual interface adapters in a first order;

identify a first virtual slot associated with a first virtual interface adapter of the plurality of virtual interface adapters;

identify, based on the first virtual slot, a first virtual device identifier associated with the first virtual interface adapter;

identify, based on the first virtual device identifier, an ordered interface name of the first virtual interface adapter; and

reorder, based on the ordered interface name, an interface ordering file to list the plurality of virtual interface adapters in a second order.

2. The computing device of claim 1 , the instructions executable to identify an entry of the interface ordering file associated with the ordered interface name of the first virtual interface adapter.

3. The computing device of claim 2 , the instructions executable to modify the identified entry to be in a highest position in an order of the interface ordering file.

4. The computing device of claim 3 , the instructions executable to modify remaining entries of the interface ordering file to be below the identified entry.

5. The computing device of claim 4 , wherein the remaining entries of the interface ordering file represent virtual external network adapters.

6. The computing device of claim 5 , wherein the first virtual interface adapter is a virtual local bus adapter.

7. The computing device of claim 6 , wherein the virtual local bus adapter is a Peripheral Component Interconnect (PCI) passthrough adapter assigned to the VM.

8. A computer implemented method comprising:

initiating, by a hypervisor, a virtual machine (VM) based on a user specification specifying a plurality of virtual interface adapters in a first order;

determining, by the hypervisor, a first virtual slot identifier associated with a first virtual interface adapter of the plurality of virtual interface adapters;

determining, by the hypervisor, using the first virtual slot identifier, a first virtual device identifier associated with the first virtual interface adapter;

determining, by the hypervisor, using the first virtual device identifier, an ordered interface name of the first virtual interface adapter; and

modifying by the hypervisor, using the ordered interface name, an interface ordering file to list the plurality of virtual interface adapters in a second order.

9. The computer implemented method of claim 8 , wherein determining the first virtual slot identifier comprises querying an application programming interface (API) of a datacenter management application.

10. The computer implemented method of claim 8 , wherein determining the first virtual device identifier comprises using an “lspci” command to access virtual device information associated with the first virtual slot identifier.

11. The computer implemented method of claim 8 , wherein determining the ordered interface name of the first virtual interface adapter comprises using an “ethtool” command to access interface information associated with the first virtual device identifier.

12. The computer implemented method of claim 8 , wherein modifying the interface ordering file comprises:

identifying an entry of the interface ordering file associated with the ordered interface name of the first virtual interface adapter;

modifying the identified entry to be in a highest position in an order of the interface ordering file; and

modifying remaining entries of the interface ordering file to be below the identified entry.

13. The computer implemented method of claim 12 , wherein the remaining entries of the interface ordering file represent virtual external network adapters.

14. The computer implemented method of claim 13 , wherein the first virtual interface adapter is a virtual local bus adapter.

15. An article comprising a non-transitory machine-readable storage medium storing instructions that upon execution cause a processor to:

execute a virtual machine (VM) based on a user specification including a plurality of virtual interface adapters in a first order;

determine a first virtual slot identifier associated with a first virtual interface adapter of the plurality of virtual interface adapters;

determine, based on the first virtual slot identifier, a first virtual device identifier associated with the first virtual interface adapter;

determine, based on the first virtual device identifier, an ordered interface name of the first virtual interface adapter; and

generate, based on the ordered interface name, an interface ordering file to list the plurality of virtual interface adapters in a second order.

16. The article of claim 15 , the instructions executable to identify an entry of the interface ordering file associated with the ordered interface name of the first virtual interface adapter.

17. The article of claim 16 , the instructions executable to:

modify the identified entry to be in a highest position in an order of the interface ordering file; and

modify remaining entries of the interface ordering file to be below the identified entry.

18. The article of claim 17 , wherein the remaining entries of the interface ordering file represent virtual external network adapters.

19. The article of claim 15 , wherein the first virtual interface adapter is a virtual local bus adapter.

20. The article of claim 19 , wherein the virtual local bus adapter is a Peripheral Component Interconnect (PCI) passthrough adapter assigned to the VM.