How do you use Helm with Terraform for infrastructure as code integration?

Combining Helm with Terraform enables infrastructure and application deployment in the same IaC workflow.

Terraform Helm provider example: # providers.tf terraform { required_providers { helm = { source = "hashicorp/helm" version = "~> 2.9" } kubernetes = { source = "hashicorp/kubernetes" version = "~> 2.20" } } } # Configure Kubernetes provider provider "kubernetes" { config_path = "~/.kube/config" } # Configure Helm provider provider "helm" { kubernetes { config_path = "~/.kube/config" } }

Deploy Helm chart with Terraform: # helm_release resource resource "helm_release" "nginx" { name = "nginx-ingress" repository = "https://kubernetes.github.io/ingress-nginx" chart = "ingress-nginx" version = "4.7.1" namespace = "ingress-nginx" create_namespace = true values = [ <<-EOT controller: replicaCount: 2 service: type: LoadBalancer resources: requests: cpu: 100m memory: 128Mi EOT ] set { name = "controller.metrics.enabled" value = "true" } set_string { name = "controller.service.annotations.service\\\\.beta\\\\.kubernetes\\\\.io/aws-load-balancer-type" value = "nlb" } depends_on = [ kubernetes_namespace.ingress ] } # Deploy local chart resource "helm_release" "myapp" { name = "myapp" chart = "${path.module}/charts/myapp" namespace = "production" values = [ file("${path.module}/environments/prod.yaml") ] timeout = 300 # Lifecycle rules lifecycle { ignore_changes = [ set # Ignore individual set changes if using values file ] } }

Deploy from OCI registry: resource "helm_release" "oci_app" { name = "oci-app" repository = "oci://myregistry.azurecr.io/helm" chart = "myapp" version = "1.2.3" namespace = "default" verify = true # Verify signature }

Multiple environments with Terraform workspaces: # main.tf locals { environment = terraform.workspace values_file = "${path.module}/environments/${local.environment}.yaml" } resource "helm_release" "myapp" { name = "myapp-${local.environment}" chart = "./myapp" namespace = local.environment values = [ file(local.values_file) ] } # Usage: # terraform workspace new dev # terraform workspace new prod # terraform apply -var-file=environments/prod.tfvars

Data sources for existing releases: data "helm_release" "existing" { name = "nginx-ingress" namespace = "ingress-nginx" } output "nginx_version" { value = data.helm_release.existing.version }

Best practices: Use terraform state locking with remote backend, manage secrets with Vault provider, use depends_on for chart ordering, and implement drift detection with terraform plan.

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