feat(aws-elasticloadbalancing): add crossZone property

Ability to enable cross-zone load balancing for a Classic Load Balancer closes aws#2786
ScOut3R · Jun 7, 2019 · 0e5ec0c · 0e5ec0c
1 parent e3df21a
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diff --git a/packages/@aws-cdk/aws-elasticloadbalancing/lib/load-balancer.ts b/packages/@aws-cdk/aws-elasticloadbalancing/lib/load-balancer.ts
@@ -49,6 +49,16 @@ export interface LoadBalancerProps {
    * @default - None.
    */
   readonly healthCheck?: HealthCheck;
+
+  /**
+   * Whether cross zone load balancing is enabled
+   *
+   * This controls whether the load balancer evenly distributes requests
+   * across each availability zone
+   *
+   * @default - false.
+   */
+  readonly crossZone?: boolean;
 }
 
 /**
@@ -226,6 +236,7 @@ export class LoadBalancer extends Resource implements IConnectable {
       listeners: new Token(() => this.listeners),
       scheme: props.internetFacing ? 'internet-facing' : 'internal',
       healthCheck: props.healthCheck && healthCheckToJSON(props.healthCheck),
+      crossZone: props.crossZone || false,
     });
     if (props.internetFacing) {
       this.elb.node.addDependency(...subnets.map(s => s.internetConnectivityEstablished));

diff --git a/packages/@aws-cdk/aws-elasticloadbalancing/test/test.loadbalancer.ts b/packages/@aws-cdk/aws-elasticloadbalancing/test/test.loadbalancer.ts
@@ -92,6 +92,25 @@ export = {
       ],
     }));
 
+    test.done();
+  },
+
+  'enable cross zone load balancing'(test: Test) {
+    // GIVEN
+    const stack = new Stack();
+    const vpc = new Vpc(stack, 'VCP');
+
+    // WHEN
+    new LoadBalancer(stack, 'LB', {
+      vpc,
+      crossZone: true,
+    });
+
+    // THEN
+    expect(stack).to(haveResource('AWS::ElasticLoadBalancing::LoadBalancer', {
+      CrossZone: true
+    }));
+
     test.done();
   }
 };