Add support for custom ALB subnets

Signed-off-by: Manuel Alejandro de Brito Fontes <[email protected]>

Author: aledbf

.env.example

@@ -28,3 +28,8 @@ IMAGE_PULL_SECRET=
 # https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.2/guide/ingress/annotations/#scheme
 # https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/how-elastic-load-balancing-works.html#load-balancer-scheme
 USE_INTERNAL_ALB=false
+
+# Configure custom Availability Zone/s that ALB will route traffic to.
+# https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.2/guide/ingress/annotations/#subnets
+# Default: use auto discovery (empty)
+ALB_SUBNETS=

lib/gitpod.ts

@@ -93,6 +93,10 @@ export class GitpodStack extends cdk.Stack {
             manifest.metadata.annotations["alb.ingress.kubernetes.io/scheme"] = 'internet-facing';
         }
 
+        if (process.env.ALB_SUBNETS) {
+            manifest.metadata.annotations["alb.ingress.kubernetes.io/subnets"] = `${process.env.ALB_SUBNETS}`;
+        }
+
         const gitpodIngress = new KubernetesManifest(this, "gitpod-ingress", {
             cluster,
             overwrite: true,