Azure DNS RBAC for integration with Kubernetes Cert Manager

Module configures IAM permissions that allow Cert Manager to be integrated with the Azure DNS service for DNS-01 ACME challenges.

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License

Once you have a Corewide Solutions Portal account, this one-time action will use your browser session to retrieve credentials:

 shellterraform login solutions.corewide.com

Provision instructions

Initialize mandatory providers:

hashicorp/azurerm

Copy and paste into your Terraform configuration and insert the variables:

 hclmodule "tf_k8s_cert_manager_dns_azure" {
  source  = "solutions.corewide.com/azure/tf-k8s-cert-manager-dns-azure/azurerm"
  version = "~> 1.0.0"

  # specify module inputs here or try one of the examples below
  ...
}

Initialize the setup:

 shellterraform init

Define update strategy

Corewide DevOps team strictly follows Semantic Versioning Specification to provide our clients with products that have predictable upgrades between versions. We recommend pinning patch versions of our modules using pessimistic constraint operator (~>) to prevent breaking changes during upgrades.

To get new features during the upgrades (without breaking compatibility), use ~> 1.0 and run terraform init -upgrade

For the safest setup, use strict pinning with version = "1.0.0"

v1.0.0 released 1 month, 2 weeks ago

Changelog

Setup with custom Cert Manager Kubernetes ServiceAccount name, namespace, tags, DNS zone ID fetched from tf-azure-dns module, OIDC provider URL fetched from the tf-azure-k8s-aks module and outputs passed to the tf-k8s-cert-manager module:

 hclmodule "aks" {
  source  = "solutions.corewide.com/azure/tf-azure-k8s-aks/azurerm"
  version = "~> 5.0"
  # ...
}

resource "azurerm_resource_group" "main" {
  name     = "foo"
  location = "westus2"
}

module "dns" {
  source  = "solutions.corewide.com/azure/tf-azure-dns/azurerm"
  version = "~> 1.0"

  resource_group_name = azurerm_resource_group.main.name
  create_zone         = true
  zone_name           = "example.com"

  records = {
    "@" = {
      type  = "A"
      ttl   = 300
      value = ["192.0.2.1"]
    }
  }
}

module "azure_cert_manager" {
  source  = "solutions.corewide.com/azure/tf-k8s-cert-manager-dns-azure/azurerm"
  version = "~> 1.0"

  name_suffix            = "foo"
  resource_group_name    = azurerm_resource_group.main.name
  region                 = azurerm_resource_group.main.location
  hosted_zone_name       = "example.com"
  hosted_zone_id         = module.dns.zone.id
  subscription_id        = "bar"
  oidc_provider_url      = module.aks.cluster.oidc_issuer_url
  cert_manager_namespace = "cert-manager-foo"
  cert_manager_sa_name   = "cert-manager-bar"

  tags = {
    env = "example"
  }
}

module "cert_manager" {
  source  = "solutions.corewide.com/kubernetes/tf-k8s-cert-manager/helm"
  version = "~> 1.1"

  acme_email             = "[email protected]"
  ingress_classes        = ["nginx"]
  dns_solver_config      = module.azure_cert_manager.issuer_spec
  service_account_labels = module.azure_cert_manager.service_account_label
  pod_labels             = module.azure_cert_manager.pod_label
}

Minimal setup with mandatory parameters, DNS zone ID fetched from tf-azure-dns module, OIDC provider URL fetched from the tf-azure-k8s-aks module and outputs passed to the tf-k8s-cert-manager module:

 hclmodule "aks" {
  source  = "solutions.corewide.com/azure/tf-azure-k8s-aks/azurerm"
  version = "~> 5.0"
  # ...
}

resource "azurerm_resource_group" "main" {
  name     = "foo"
  location = "westus2"
}

module "dns" {
  source  = "solutions.corewide.com/azure/tf-azure-dns/azurerm"
  version = "~> 1.0"

  resource_group_name = azurerm_resource_group.main.name
  create_zone         = true
  zone_name           = "example.com"

  records = {
    "@" = {
      type  = "A"
      ttl   = 300
      value = ["192.0.2.1"]
    }
  }
}

module "azure_cert_manager" {
  source  = "solutions.corewide.com/azure/tf-k8s-cert-manager-dns-azure/azurerm"
  version = "~> 1.0"

  resource_group_name = azurerm_resource_group.main.name
  region              = azurerm_resource_group.main.location
  hosted_zone_name    = "example.com"
  hosted_zone_id      = module.dns.zone.id
  subscription_id     = "bar"
  oidc_provider_url   = module.aks.cluster.oidc_issuer_url
}

module "cert_manager" {
  source  = "solutions.corewide.com/kubernetes/tf-k8s-cert-manager/helm"
  version = "~> 1.1"

  acme_email             = "[email protected]"
  ingress_classes        = ["nginx"]
  dns_solver_config      = module.azure_cert_manager.issuer_spec
  service_account_labels = module.azure_cert_manager.service_account_label
  pod_labels             = module.azure_cert_manager.pod_label
}

Variable	Description	Type	Default	Required	Sensitive
`hosted_zone_id`	Azure DNS hosted zone ID	`string`		yes	no
`hosted_zone_name`	Azure DNS hosted zone name	`string`		yes	no
`oidc_provider_url`	OpenID Connect provider URL	`string`		yes	no
`region`	Region of a Resource Group to create resources in	`string`		yes	no
`resource_group_name`	Name of the Resource Group to create resources in	`string`		yes	no
`subscription_id`	Azure Subscription ID to create resources in	`string`		yes	no
`cert_manager_namespace`	Kubernetes namespace to configure RBAC for Cert Manager in	`string`	`cert-manager`	no	no
`cert_manager_sa_name`	Kubernetes Cert Manager's `ServiceAccount` name to configure RBAC for	`string`	`cert-manager`	no	no
`name_suffix`	Name suffix for RBAC resources to create	`string`	`cert-manager`	no	no
`tags`	Map of tags to assign to resources	`map(string)`	`{}`	no	no

Output	Description	Type	Sensitive
`issuer_spec`	Cert Manager parameters for Azure DNS DNS-01 ACME challenge provider	`map`	no
`pod_label`	Label to add to the Cert Manager controller's `Pod`	`map`	no
`service_account_label`	Label to add to the Cert Manager controller's `ServiceAccount`	`map`	no