I am trying to retrieve the hostname in my Application Load Balancer that I configured as ingress.
The scenario currently is: I am deploying a helm chart using terraform, and have configured an ALB as ingress. The ALB and the Helm chart was deployed normally and is working, however, I need to retrieve the hostname of this ALB to create a Route53 record pointing to this ALB. When I try to retrieve this information, it returns null values.
According to terraform's own documentation, the correct way is as follows:
data "kubernetes_ingress" "example" {
metadata {
name = "terraform-example"
}
}
resource "aws_route53_record" "example" {
zone_id = data.aws_route53_zone.k8.zone_id
name = "example"
type = "CNAME"
ttl = "300"
records = [data.kubernetes_ingress.example.status.0.load_balancer.0.ingress.0.hostname]
}
I did exactly as in the documentation (even the provider version is the latest), here is an excerpt of my code:
# Helm release resource
resource "helm_release" "argocd" {
name = "argocd"
repository = "https://argoproj.github.io/argo-helm"
chart = "argo-cd"
namespace = "argocd"
version = "4.9.7"
create_namespace = true
values = [
templatefile("${path.module}/settings/helm/argocd/values.yaml", {
certificate_arn = module.acm_certificate.arn
})
]
}
# Kubernetes Ingress data to retrieve de ingress hostname from helm deployment (ALB Hostname)
data "kubernetes_ingress" "argocd" {
metadata {
name = "argocd-server"
namespace = helm_release.argocd.namespace
}
depends_on = [
helm_release.argocd
]
}
# Route53 record creation
resource "aws_route53_record" "argocd" {
name = "argocd"
type = "CNAME"
ttl = 600
zone_id = aws_route53_zone.r53_zone.id
records = [data.kubernetes_ingress.argocd.status.0.load_balancer.0.ingress.0.hostname]
}
When I run the terraform apply I've get the following error:
╷
│ Error: Attempt to index null value
│
│ on route53.tf line 67, in resource "aws_route53_record" "argocd":
│ 67: records = [data.kubernetes_ingress.argocd.status.0.load_balancer.0.ingress.0.hostname]
│ ├────────────────
│ │ data.kubernetes_ingress.argocd.status is null
│
│ This value is null, so it does not have any indices.
My ingress configuration (deployed by Helm Release):
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: argocd-server
namespace: argocd
uid: 646f6ea0-7991-4a13-91d0-da236164ac3e
resourceVersion: '4491'
generation: 1
creationTimestamp: '2022-08-08T13:29:16Z'
labels:
app.kubernetes.io/component: server
app.kubernetes.io/instance: argocd
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: argocd-server
app.kubernetes.io/part-of: argocd
helm.sh/chart: argo-cd-4.9.7
annotations:
alb.ingress.kubernetes.io/backend-protocol: HTTPS
alb.ingress.kubernetes.io/certificate-arn: >-
arn:aws:acm:us-east-1:124416843011:certificate/7b79fa2c-d446-423d-b893-c8ff3d92a5e1
alb.ingress.kubernetes.io/group.name: altb-devops-eks-support-alb
alb.ingress.kubernetes.io/listen-ports: '[{"HTTPS":443}]'
alb.ingress.kubernetes.io/load-balancer-name: altb-devops-eks-support-alb
alb.ingress.kubernetes.io/scheme: internal
alb.ingress.kubernetes.io/tags: >-
Name=altb-devops-eks-support-alb,Stage=Support,CostCenter=Infrastructure,Project=Shared
Infrastructure,Team=DevOps
alb.ingress.kubernetes.io/target-type: ip
kubernetes.io/ingress.class: alb
meta.helm.sh/release-name: argocd
meta.helm.sh/release-namespace: argocd
finalizers:
- group.ingress.k8s.aws/altb-devops-eks-support-alb
managedFields:
- manager: controller
operation: Update
apiVersion: networking.k8s.io/v1
time: '2022-08-08T13:29:16Z'
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:finalizers:
.: {}
v:"group.ingress.k8s.aws/altb-devops-eks-support-alb": {}
- manager: terraform-provider-helm_v2.6.0_x5
operation: Update
apiVersion: networking.k8s.io/v1
time: '2022-08-08T13:29:16Z'
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.: {}
f:alb.ingress.kubernetes.io/backend-protocol: {}
f:alb.ingress.kubernetes.io/certificate-arn: {}
f:alb.ingress.kubernetes.io/group.name: {}
f:alb.ingress.kubernetes.io/listen-ports: {}
f:alb.ingress.kubernetes.io/load-balancer-name: {}
f:alb.ingress.kubernetes.io/scheme: {}
f:alb.ingress.kubernetes.io/tags: {}
f:alb.ingress.kubernetes.io/target-type: {}
f:kubernetes.io/ingress.class: {}
f:meta.helm.sh/release-name: {}
f:meta.helm.sh/release-namespace: {}
f:labels:
.: {}
f:app.kubernetes.io/component: {}
f:app.kubernetes.io/instance: {}
f:app.kubernetes.io/managed-by: {}
f:app.kubernetes.io/name: {}
f:app.kubernetes.io/part-of: {}
f:helm.sh/chart: {}
f:spec:
f:rules: {}
- manager: controller
operation: Update
apiVersion: networking.k8s.io/v1
time: '2022-08-08T13:29:20Z'
fieldsType: FieldsV1
fieldsV1:
f:status:
f:loadBalancer:
f:ingress: {}
subresource: status
selfLink: /apis/networking.k8s.io/v1/namespaces/argocd/ingresses/argocd-server
status:
loadBalancer:
ingress:
- hostname: >-
internal-altb-devops-eks122-support-alb-1845221539.us-east-1.elb.amazonaws.com
spec:
rules:
- host: argocd.altb.co
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: argocd-server
port:
number: 80
The terraform datasource for Ingress is : kubernetes_ingress_v1. https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs/data-sources/ingress_v1
data "kubernetes_ingress_v1" "argocd" {
metadata {
name = "argocd-server"
namespace = helm_release.argocd.namespace
}
depends_on = [
helm_release.argocd
]
}
This should work.