application_configuration

AKS Application Configuration

Terraform code for generating the application configuration.

Terraform documentation

For the list of requirement, inputs, outputs, resources... check the terraform module documentation.

Usage

module "application_configuration" {
  source = "git::https://github.com/DFE-Digital/terraform-modules.git//aks/application_configuration?ref=stable"

  namespace             = var.namespace
  environment           = local.environment
  azure_resource_prefix = var.azure_resource_prefix
  service_short         = local.service_short
  config_short          = var.config_short

  config_variables      = {}
  config_variables_path = "config.yaml"

  secret_variables      = {}
}

Rails applications

If is_rails_application is set to true, this will automatically set the following config variables:

RAILS_SERVE_STATIC_FILES=true
RAILS_LOG_TO_STDOUT=true

Secrets

Secrets are automatically extracted from an Azure Key Vault using the AKS Secrets module and exposed to the application via environment variables.

Azure Key Vault doesn't allow keys with underscores and environment variable names can't have dashes, so dashes are automatically replaced with underscores before being exposed as environment variables.

The short name of the key vault can be customised by setting secret_key_vault_short, usually this should either be null or set to "app". Any dashes in the keys are automatically converted to underscores.

If your application still has an old-style YAML secret in the key vault, this module can be used to extract the values from it by setting the secret_yaml_key variable.

Outputs

kubernetes_config_map_name

The name of the Kubernetes ConfigMap.

kubernetes_secret_name

The name of the Kubernetes secrets.