How to give permissions to AKS to access ACR via terraform? - terraform

Question

Question and details
How can I allow a Kubernetes cluster in Azure to talk to an Azure Container Registry via terraform?
I want to load custom images from my Azure Container Registry. Unfortunately, I encounter a permissions error at the point where Kubernetes is supposed to download the image from the ACR.
What I have tried so far
My experiments without terraform (az cli)
It all works perfectly after I attach the acr to the aks via az cli:
az aks update -n myAKSCluster -g myResourceGroup --attach-acr <acrName>
My experiments with terraform
This is my terraform configuration; I have stripped some other stuff out. It works in itself.
terraform {
backend "azurerm" {
resource_group_name = "tf-state"
storage_account_name = "devopstfstate"
container_name = "tfstatetest"
key = "prod.terraform.tfstatetest"
}
}
provider "azurerm" {
}
provider "azuread" {
}
provider "random" {
}
# define the password
resource "random_string" "password" {
length = 32
special = true
}
# define the resource group
resource "azurerm_resource_group" "rg" {
name = "myrg"
location = "eastus2"
}
# define the app
resource "azuread_application" "tfapp" {
name = "mytfapp"
}
# define the service principal
resource "azuread_service_principal" "tfapp" {
application_id = azuread_application.tfapp.application_id
}
# define the service principal password
resource "azuread_service_principal_password" "tfapp" {
service_principal_id = azuread_service_principal.tfapp.id
end_date = "2020-12-31T09:00:00Z"
value = random_string.password.result
}
# define the container registry
resource "azurerm_container_registry" "acr" {
name = "mycontainerregistry2387987222"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
sku = "Basic"
admin_enabled = false
}
# define the kubernetes cluster
resource "azurerm_kubernetes_cluster" "mycluster" {
name = "myaks"
location = azurerm_resource_group.rg.location
resource_group_name = azurerm_resource_group.rg.name
dns_prefix = "mycluster"
network_profile {
network_plugin = "azure"
}
default_node_pool {
name = "default"
node_count = 1
vm_size = "Standard_B2s"
}
# Use the service principal created above
service_principal {
client_id = azuread_service_principal.tfapp.application_id
client_secret = azuread_service_principal_password.tfapp.value
}
tags = {
Environment = "demo"
}
windows_profile {
admin_username = "dingding"
admin_password = random_string.password.result
}
}
# define the windows node pool for kubernetes
resource "azurerm_kubernetes_cluster_node_pool" "winpool" {
name = "winp"
kubernetes_cluster_id = azurerm_kubernetes_cluster.mycluster.id
vm_size = "Standard_B2s"
node_count = 1
os_type = "Windows"
}
# define the kubernetes name space
resource "kubernetes_namespace" "namesp" {
metadata {
name = "namesp"
}
}
# Try to give permissions, to let the AKR access the ACR
resource "azurerm_role_assignment" "acrpull_role" {
scope = azurerm_container_registry.acr.id
role_definition_name = "AcrPull"
principal_id = azuread_service_principal.tfapp.object_id
skip_service_principal_aad_check = true
}
This code is adapted from https://github.com/terraform-providers/terraform-provider-azuread/issues/104.
Unfortunately, when I launch a container inside the kubernetes cluster, I receive an error message:
Failed to pull image "mycontainerregistry.azurecr.io/myunittests": [rpc error: code = Unknown desc = Error response from daemon: manifest for mycontainerregistry.azurecr.io/myunittests:latest not found: manifest unknown: manifest unknown, rpc error: code = Unknown desc = Error response from daemon: Get https://mycontainerregistry.azurecr.io/v2/myunittests/manifests/latest: unauthorized: authentication required]
Update / note:
When I run terraform apply with the above code, the creation of resources is interrupted:
azurerm_container_registry.acr: Creation complete after 18s [id=/subscriptions/000/resourceGroups/myrg/providers/Microsoft.ContainerRegistry/registries/mycontainerregistry2387987222]
azurerm_role_assignment.acrpull_role: Creating...
azuread_service_principal_password.tfapp: Still creating... [10s elapsed]
azuread_service_principal_password.tfapp: Creation complete after 12s [id=000/000]
azurerm_kubernetes_cluster.mycluster: Creating...
azurerm_role_assignment.acrpull_role: Creation complete after 8s [id=/subscriptions/000/resourceGroups/myrg/providers/Microsoft.ContainerRegistry/registries/mycontainerregistry2387987222/providers/Microsoft.Authorization/roleAssignments/000]
azurerm_kubernetes_cluster.mycluster: Still creating... [10s elapsed]
Error: Error creating Managed Kubernetes Cluster "myaks" (Resource Group "myrg"): containerservice.ManagedClustersClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="ServicePrincipalNotFound" Message="Service principal clientID: 000 not found in Active Directory tenant 000, Please see https://aka.ms/aks-sp-help for more details."
on test.tf line 56, in resource "azurerm_kubernetes_cluster" "mycluster":
56: resource "azurerm_kubernetes_cluster" "mycluster" {
I think, however, that this is just because it takes a few minutes for the service principal to be created. When I run terraform apply again a few minutes later, it goes beyond that point without issues.

Answer 1

(I did up the answer above)
Just adding a simpler way where you don't need to create a service principal for anyone else that might need it.
resource "azurerm_kubernetes_cluster" "kubweb" {
name = local.cluster_web
location = local.rgloc
resource_group_name = local.rgname
dns_prefix = "${local.cluster_web}-dns"
kubernetes_version = local.kubversion
# used to group all the internal objects of this cluster
node_resource_group = "${local.cluster_web}-rg-node"
# azure will assign the id automatically
identity {
type = "SystemAssigned"
}
default_node_pool {
name = "nodepool1"
node_count = 4
vm_size = local.vm_size
orchestrator_version = local.kubversion
}
role_based_access_control {
enabled = true
}
addon_profile {
kube_dashboard {
enabled = true
}
}
tags = {
environment = local.env
}
}
resource "azurerm_container_registry" "acr" {
name = "acr1"
resource_group_name = local.rgname
location = local.rgloc
sku = "Standard"
admin_enabled = true
tags = {
environment = local.env
}
}
# add the role to the identity the kubernetes cluster was assigned
resource "azurerm_role_assignment" "kubweb_to_acr" {
scope = azurerm_container_registry.acr.id
role_definition_name = "AcrPull"
principal_id = azurerm_kubernetes_cluster.kubweb.kubelet_identity[0].object_id
}

Answer 2

This code worked for me.
resource "azuread_application" "aks_sp" {
name = "sp-aks-${local.cluster_name}"
}
resource "azuread_service_principal" "aks_sp" {
application_id = azuread_application.aks_sp.application_id
app_role_assignment_required = false
}
resource "azuread_service_principal_password" "aks_sp" {
service_principal_id = azuread_service_principal.aks_sp.id
value = random_string.aks_sp_password.result
end_date_relative = "8760h" # 1 year
lifecycle {
ignore_changes = [
value,
end_date_relative
]
}
}
resource "azuread_application_password" "aks_sp" {
application_object_id = azuread_application.aks_sp.id
value = random_string.aks_sp_secret.result
end_date_relative = "8760h" # 1 year
lifecycle {
ignore_changes = [
value,
end_date_relative
]
}
}
data "azurerm_container_registry" "pyp" {
name = var.container_registry_name
resource_group_name = var.container_registry_resource_group_name
}
resource "azurerm_role_assignment" "aks_sp_container_registry" {
scope = data.azurerm_container_registry.pyp.id
role_definition_name = "AcrPull"
principal_id = azuread_service_principal.aks_sp.object_id
}
# requires Azure Provider 1.37+
resource "azurerm_kubernetes_cluster" "pyp" {
name = local.cluster_name
location = azurerm_resource_group.pyp.location
resource_group_name = azurerm_resource_group.pyp.name
dns_prefix = local.env_name_nosymbols
kubernetes_version = local.kubernetes_version
default_node_pool {
name = "default"
node_count = 1
vm_size = "Standard_D2s_v3"
os_disk_size_gb = 80
}
windows_profile {
admin_username = "winadm"
admin_password = random_string.windows_profile_password.result
}
network_profile {
network_plugin = "azure"
dns_service_ip = cidrhost(local.service_cidr, 10)
docker_bridge_cidr = "172.17.0.1/16"
service_cidr = local.service_cidr
load_balancer_sku = "standard"
}
service_principal {
client_id = azuread_service_principal.aks_sp.application_id
client_secret = random_string.aks_sp_password.result
}
addon_profile {
oms_agent {
enabled = true
log_analytics_workspace_id = azurerm_log_analytics_workspace.pyp.id
}
}
tags = local.tags
}
source https://github.com/giuliov/pipeline-your-pipelines/tree/master/src/kubernetes/terraform

Answer 3

Just want to go into more depth as this was something I struggled with as-well.
The recommended approach is to use Managed Identities instead of Service Principal due to less overhead.
Create a Container Registry:
resource "azurerm_container_registry" "acr" {
name = "acr"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
sku = "Standard"
admin_enabled = false
}
Create a AKS Cluster, the code below creates the AKS Cluster with 2 Identities:
A System Assigned Identity which is assigned to the Control Plane.
A User Assigned Managed Identity is also automatically created and assigned to the Kubelet, notice I have no specific code for that as it happens automatically.
The Kubelet is the process which goes to the Container Registry to pull the image, thus we need to make sure this User Assigned Managed Identity has the AcrPull Role on the Container Registry.
resource "azurerm_kubernetes_cluster" "aks" {
name = "aks"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
dns_prefix = "aks"
node_resource_group = "aks-node"
default_node_pool {
name = "default"
node_count = 1
vm_size = "Standard_Ds2_v2"
enable_auto_scaling = false
type = "VirtualMachineScaleSets"
vnet_subnet_id = azurerm_subnet.aks_subnet.id
max_pods = 50
}
network_profile {
network_plugin = "azure"
load_balancer_sku = "Standard"
}
identity {
type = "SystemAssigned"
}
}
Create Role Assignment mentioned above to allow the User Assigned Managed Identity to Pull from the Container Registry.
resource "azurerm_role_assignment" "ra" {
principal_id = azurerm_kubernetes_cluster.aks.kubelet_identity[0].object_id
role_definition_name = "AcrPull"
scope = azurerm_container_registry.acr.id
skip_service_principal_aad_check = true
}
Hope that clears things up for you, as I have seen some confusion on the internet about the two identities created.
source: https://jimferrari.com/2022/02/09/attach-azure-container-registry-to-azure-kubernetes-service-terraform/

Answer 4

The Terraform documentation for the Azure Container Registry resource now keeps track of this, which should always be up to date.
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/container_registry#example-usage-attaching-a-container-registry-to-a-kubernetes-cluster
resource "azurerm_resource_group" "example" {
name = "example-resources"
location = "West Europe"
}
resource "azurerm_container_registry" "example" {
name = "containerRegistry1"
resource_group_name = azurerm_resource_group.example.name
location = azurerm_resource_group.example.location
}
resource "azurerm_kubernetes_cluster" "example" {
name = "example-aks1"
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
dns_prefix = "exampleaks1"
default_node_pool {
name = "default"
node_count = 1
vm_size = "Standard_D2_v2"
}
identity {
type = "SystemAssigned"
}
tags = {
Environment = "Production"
}
}
resource "azurerm_role_assignment" "example" {
principal_id = azurerm_kubernetes_cluster.example.kubelet_identity[0].object_id
role_definition_name = "AcrPull"
scope = azurerm_container_registry.example.id
skip_service_principal_aad_check = true
}