Get redis host url from terraform helm_release resource - kubernetes

Question

I'm using Terraform helm_release resource to install bitnami/redis instance in my K8s cluster.
The code looks like this:
resource "helm_release" "redis-chart" {
name = "redis-${var.env}"
repository = "https://charts.bitnami.com/bitnami"
chart = "redis"
namespace = "redis"
create_namespace = true
set {
name = "auth.enabled"
value = "false"
}
set {
name = "master.containerPort"
value = "6379"
}
set {
name = "replica.replicaCount"
value = "2"
}
}
It completes successfully and in a separate directory I have my app terraform configuration.
In the app configuration, I want to get get the redis host from the above helm_release.
I'm doing it like this:
data "kubernetes_service" "redis-master" {
metadata {
name = "redis-${var.env}-master"
namespace = "redis"
}
}
And then in the kubernetes_secret resource I'm passing the data to my app deployment:
resource "kubernetes_secret" "questo-server-secrets" {
metadata {
name = "questo-server-secrets-${var.env}"
namespace = kubernetes_namespace.app-namespace.metadata.0.name
}
data = {
REDIS_HOST = data.kubernetes_service.redis-master.metadata.0.name
REDIS_PORT = data.kubernetes_service.redis-master.spec.0.port.0.port
}
}
But unfortunately, when I run the app deployment I'm getting the following logs:
[ioredis] Unhandled error event: Error: getaddrinfo ENOTFOUND
redis-dev-master
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:66:26) [ioredis] Unhandled error event: Error: getaddrinfo ENOTFOUND
Which suggests that redis-dev-master is not a correct host for the redis instance.
How do I get the redis host from helm_release or any underlying services the release creates?
I've tried debugging and pinging a specific pod from my app deployment.
For reference, these are my redis resources:
NAME READY STATUS RESTARTS AGE
pod/redis-dev-master-0 1/1 Running 0 34m
pod/redis-dev-replicas-0 1/1 Running 1 34m
pod/redis-dev-replicas-1 1/1 Running 0 32m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/redis-dev-headless ClusterIP None <none> 6379/TCP 34m
service/redis-dev-master ClusterIP 172.20.215.60 <none> 6379/TCP 34m
service/redis-dev-replicas ClusterIP 172.20.117.134 <none> 6379/TCP 34m
NAME READY AGE
statefulset.apps/redis-dev-master 1/1 34m
statefulset.apps/redis-dev-replicas 2/2 34m

Answer 1

Maybe you were just using the wrong attribute to get that information. Checking the documentation at the Terraform Registry Website we can use the
cluster_ip attribute as described at the spec documentation description.
So you should end up with something like:
data.kubernetes_service.redis-master.spec.cluster_ip
And finally ending up with the following:
resource "kubernetes_secret" "questo-server-secrets" {
metadata {
name = "questo-server-secrets-${var.env}"
namespace = kubernetes_namespace.app-namespace.metadata.0.name
}
data = {
REDIS_HOST = data.kubernetes_service.redis-master.spec.cluster_ip
REDIS_PORT = data.kubernetes_service.redis-master.spec.port
}
}