NE-1530: Add API for AWS LB Subnet Selection

Allows users to specify subnets (i.e. Availability Zones) for
IngressControllers in AWS. Introduce under the
`AWSLoadBalancerSubnetSelection` FeatureGate.

openapi/openapi.json

@@ -25114,6 +25114,14 @@
           "description": "networkLoadBalancerParameters holds configuration parameters for an AWS network load balancer. Present only if type is NLB.",
           "$ref": "#/definitions/com.github.openshift.api.operator.v1.AWSNetworkLoadBalancerParameters"
         },
+        "subnets": {
+          "description": "subnets specifies the list of subnets for the load balancer to route traffic to. The values can be either a subnet ID or name. Each subnet must be from a different availability zones otherwise the load balancer will not be provisioned. Additionally, if a subnet is not found, the load balancer will not be provisioned.\n\nWhen omitted, the subnets will be auto-discovered per availability zone.",
+          "type": "array",
+          "items": {
+            "type": "string",
+            "default": ""
+          }
+        },
         "type": {
           "description": "type is the type of AWS load balancer to instantiate for an ingresscontroller.\n\nValid values are:\n\n* \"Classic\": A Classic Load Balancer that makes routing decisions at either\n  the transport layer (TCP/SSL) or the application layer (HTTP/HTTPS). See\n  the following for additional details:\n\n    https://docs.aws.amazon.com/AmazonECS/latest/developerguide/load-balancer-types.html#clb\n\n* \"NLB\": A Network Load Balancer that makes routing decisions at the\n  transport layer (TCP/SSL). See the following for additional details:\n\n    https://docs.aws.amazon.com/AmazonECS/latest/developerguide/load-balancer-types.html#nlb",
           "type": "string",
@@ -25125,7 +25133,8 @@
           "discriminator": "type",
           "fields-to-discriminateBy": {
             "classicLoadBalancer": "ClassicLoadBalancerParameters",
-            "networkLoadBalancer": "NetworkLoadBalancerParameters"
+            "networkLoadBalancer": "NetworkLoadBalancerParameters",
+            "subnets": "Subnets"
           }
         }
       ]

operator/v1/types_ingress.go

@@ -545,6 +545,19 @@ type AWSLoadBalancerParameters struct {
 	//
 	// +optional
 	NetworkLoadBalancerParameters *AWSNetworkLoadBalancerParameters `json:"networkLoadBalancer,omitempty"`
+
+	// subnets specifies the list of subnets for the load balancer to
+	// route traffic to. The values can be either a subnet ID or name.
+	// Each subnet must be from a different availability zones otherwise
+	// the load balancer will not be provisioned. Additionally, if a subnet
+	// is not found, the load balancer will not be provisioned.
+	//
+	// When omitted, the subnets will be auto-discovered per availability zone.
+	//
+	// +optional
+	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="subnets is immutable once set"
+	// +openshift:enable:FeatureGate=AWSLoadBalancerSubnetSelection
+	Subnets []string `json:"subnets,omitempty"`
 }
 
 // AWSLoadBalancerType is the type of AWS load balancer to instantiate.

operator/v1/zz_generated.crd-manifests/0000_50_ingress_00_ingresscontrollers.crd.yaml → operator/v1/zz_generated.crd-manifests/0000_50_ingress_00_ingresscontrollers-Default.crd.yaml

@@ -7,6 +7,7 @@ metadata:
     capability.openshift.io/name: Ingress
     include.release.openshift.io/ibm-cloud-managed: "true"
     include.release.openshift.io/self-managed-high-availability: "true"
+    release.openshift.io/feature-set: Default
   name: ingresscontrollers.operator.openshift.io
 spec:
   group: operator.openshift.io

operator/v1/zz_generated.featuregated-crd-manifests.yaml

@@ -174,7 +174,8 @@ ingresscontrollers.operator.openshift.io:
   CRDName: ingresscontrollers.operator.openshift.io
   Capability: Ingress
   Category: ""
-  FeatureGates: []
+  FeatureGates:
+  - AWSLoadBalancerSubnetSelection
   FilenameOperatorName: ingress
   FilenameOperatorOrdering: "00"
   FilenameRunLevel: "0000_50"