Configuring service load balancers with specified backend virtual networks

1. A system comprising:

an orchestrator for a virtualized computing infrastructure, wherein the orchestrator comprises processing circuitry coupled to memory, configured to:

receive a service definition for a service, wherein the service definition specifies an identifier of a backend virtual network for the service, wherein the backend virtual network is one of a plurality of virtual networks implemented on a physical network for the virtualized computing infrastructure,

create a load balancer object for a load balancer, wherein the load balancer object comprises a load balancer member object, and

annotate the load balancer member object to specify a virtual network interface corresponding to a network label identifying the backend virtual network; and

a network controller, wherein the network controller comprises processing circuitry coupled to memory, configured to:

send, to a computing device that hosts a backend virtual execution element for the service, interface configuration data to configure, for the backend virtual execution element, the virtual network interface for the backend virtual network to enable communications with the load balancer on the backend virtual network, and

configure, based on the load balancer member object annotation specifying the virtual network interface, the load balancer to load balance service traffic for the service in part to the virtual network interface for the backend virtual network.

2. The system of claim 1 , wherein the orchestrator is configured to direct the network controller to create the load balancer for the service.

3. The system of claim 1 , wherein the network controller is configured to:

allocate a service Internet Protocol (IP) address for the service; and

configure the service with the service IP address.

4. The system of claim 1 ,

wherein the orchestrator is configured to annotate configuration data for the backend virtual execution element to specify the backend virtual network, and

wherein the network controller is configured to, based on the annotated configuration data for the backend virtual execution element, send the interface configuration data to configure, for the backend virtual execution element, the virtual network interface for the backend virtual network.

5. The system of claim 1 , wherein to configure the load balancer, the network controller is configured to:

receive a virtual network address for the virtual network interface for the backend virtual network; and

configure the load balancer to load balance the service traffic in part to the virtual network address.

6. The system of claim 1 , wherein to configure the load balancer, the network controller is configured to:

receive a virtual network address for the virtual network interface for the backend virtual network in association with a service Internet Protocol (IP) address for the service; and

configure the load balancer to load balance the service traffic, sent to the service IP address, in part to the virtual network address.

7. The system of claim 1 ,

wherein the virtual network interface for the backend virtual network is the primary interface of the backend virtual execution element.

8. The system of claim 1 , wherein the backend virtual execution element comprises a Kubernetes pod.

9. The system of claim 8 , wherein the load balancer comprises a Kubernetes service that provides access to the Kubernetes pod via a service Internet Protocol (IP) address assigned to the Kubernetes service.

10. The system of claim 1 , wherein the orchestrator is configured to:

select the network label identifying the backend virtual network, and configure the load balancer object based on the network label.

11. The system of claim 1 , wherein the load balancer object comprises a load balancer listener object, and a load balancer pool object.

12. An orchestrator for a virtualized computing infrastructure, the orchestrator comprising:

processing circuitry coupled to memory, configured to:

receive a service definition for a service, wherein the service definition specifies an identifier of a backend virtual network for the service, wherein the backend virtual network is one of a plurality of virtual networks implemented on a physical network for the virtualized computing infrastructure;

create a load balancer object for a load balancer, wherein the load balancer object comprises a load balancer member object;

annotate the load balancer member object to specify a virtual network interface corresponding to a network label identifying the backend virtual network; and

configure, based in part on the load balancer member object annotation specifying the virtual network interface, a network controller to configure the load balancer to load balance service traffic for the service in part to the virtual network interface, of a backend virtual execution element, for the backend virtual network to enable communications with the load balancer on the backend virtual network.

13. A method comprising:

receiving, by an orchestrator for a virtualized computing infrastructure, a service definition for a service, wherein the service definition specifies an identifier of a backend virtual network for the service, wherein the backend virtual network is one of a plurality of virtual networks implemented on a physical network for the virtualized computing infrastructure;

creating, by the orchestrator, a load balancer object for a load balancer, wherein the load balancer object comprises a load balancer member object;

annotating the load balancer member object to specify a virtual network interface corresponding to a network label identifying the backend virtual network;

sending, by a network controller, to a computing device that hosts a backend virtual execution element for the service, interface configuration data to configure, for the backend virtual execution element, the virtual network interface for the backend virtual network to enable communications with the load balancer on the backend virtual network; and

configuring, by the network controller and based on the load balancer member object annotation specifying the virtual network interface, the load balancer to load balance service traffic for the service in part to the virtual network interface for the backend virtual network.

14. The method of claim 13 , further comprising creating the load balancer for the service.

15. The method of claim 13 , further comprising:

allocating a service Internet Protocol (IP) address for the service; and

configuring the service with the service IP address.

16. The method of claim 13 , further comprising:

annotating, by the orchestrator, configuration data for the backend virtual execution element to specify the backend virtual network; and

sending, based on the annotated configuration data for the backend virtual execution element, the interface configuration data to configure, for the backend virtual execution element, the virtual network interface for the backend virtual network.

17. The method of claim 13 , wherein configuring the load balancer further comprises:

receiving a virtual network address for the virtual network interface for the backend virtual network; and

configuring the load balancer to load balance the service traffic in part to the virtual network address.

18. The method of claim 13 , wherein configuring the load balancer further comprises:

receiving a virtual network address for the virtual network interface for the backend virtual network in association with a floating Internet Protocol (IP) address for the service; and

configuring the load balancer to load balance the service traffic, sent to the service IP address, in part to the virtual network address.

19. The method of claim 13 , further comprising:

selecting, by the orchestrator, the network label identifying the backend virtual network; and

configuring, by the orchestrator, the load balancer object based on the network label.

20. The method of claim 13 , wherein the load balancer object comprises a load balancer listener object, and a load balancer pool object.