Configure the control plane
The control plane for SAP Deployment Automation Framework consists of the following components:
- Deployer
- SAP library
Deployer
The deployer is the execution engine of SAP Deployment Automation Framework. It's a preconfigured virtual machine (VM) that's used for running Terraform and Ansible commands. When you use Azure DevOps, the deployer is a self-hosted agent.
The configuration of the deployer is performed in a Terraform tfvars variable file.
Terraform parameters
This table shows the Terraform parameters. These parameters need to be entered manually if you aren't using the deployment scripts.
| Variable | Description | Type |
|---|---|---|
tfstate_resource_id |
Azure resource identifier for the storage account in the SAP library that contains the Terraform state files | Required |
Environment parameters
This table shows the parameters that define the resource naming.
| Variable | Description | Type | Notes |
|---|---|---|---|
environment |
Identifier for the control plane (maximum of five characters). | Mandatory | For example, PROD for a production environment and NP for a nonproduction environment. |
location |
Azure region in which to deploy. | Required | Use lowercase. |
name_override_file |
Name override file. | Optional | See Custom naming. |
place_delete_lock_on_resources |
Place a delete lock on the key resources. | Optional |
Resource group
This table shows the parameters that define the resource group.
| Variable | Description | Type |
|---|---|---|
resource_group_name |
Name of the resource group to be created | Optional |
resource_group_arm_id |
Azure resource identifier for an existing resource group | Optional |
resourcegroup_tags |
Tags to be associated with the resource group | Optional |
Network parameters
The automation framework supports both creating the virtual network and the subnets (green field) or using an existing virtual network and existing subnets (brown field) or a combination of green field and brown field:
- Green-field scenario: The virtual network address space and the subnet address prefixes must be specified.
- Brown-field scenario: The Azure resource identifier for the virtual network and the subnets must be specified.
The recommended CIDR of the virtual network address space is /27, which allows space for 32 IP addresses. A CIDR value of /28 only allows 16 IP addresses. If you want to include Azure Firewall, use a CIDR value of /25, because Azure Firewall requires a range of /26.
The recommended CIDR value for the management subnet is /28, which allows 16 IP addresses. The recommended CIDR value for the firewall subnet is /26, which allows 64 IP addresses.
This table shows the networking parameters.
| Variable | Description | Type | Notes |
|---|---|---|---|
management_network_name |
The name of the virtual network into which the deployer will be deployed | Optional | For green-field deployments |
management_network_logical_name |
The logical name of the network (DEV-WEEU-MGMT01-INFRASTRUCTURE) | Required | |
management_network_arm_id |
The Azure resource identifier for the virtual network | Optional | For brown-field deployments |
management_network_address_space |
The address range for the virtual network | Mandatory | For green-field deployments |
management_subnet_name |
The name of the subnet | Optional | |
management_subnet_address_prefix |
The address range for the subnet | Mandatory | For green-field deployments |
management_subnet_arm_id |
The Azure resource identifier for the subnet | Mandatory | For brown-field deployments |
management_subnet_nsg_name |
The name of the network security group | Optional | |
management_subnet_nsg_arm_id |
The Azure resource identifier for the network security group | Mandatory | For brown-field deployments |
management_subnet_nsg_allowed_ips |
Range of allowed IP addresses to add to Azure Firewall | Optional | |
management_firewall_subnet_arm_id |
The Azure resource identifier for the Azure Firewall subnet | Mandatory | For brown-field deployments |
management_firewall_subnet_address_prefix |
The address range for the subnet | Mandatory | For green-field deployments |
management_bastion_subnet_arm_id |
The Azure resource identifier for the Azure Bastion subnet | Mandatory | For brown-field deployments |
management_bastion_subnet_address_prefix |
The address range for the subnet | Mandatory | For green-field deployments |
webapp_subnet_arm_id |
The Azure resource identifier for the web app subnet | Mandatory | For brown-field deployments by using the web app |
webapp_subnet_address_prefix |
The address range for the subnet | Mandatory | For green-field deployments by using the web app |
use_private_endpoint |
Use private endpoints. | Optional | |
use_service_endpoint |
Use service endpoints for subnets. | Optional |
Note
When you use an existing subnet for the web app, the subnet must be empty, in the same region as the resource group being deployed, and delegated to Microsoft.Web/serverFarms.
Deployer virtual machine parameters
This table shows the parameters related to the deployer VM.
| Variable | Description | Type |
|---|---|---|
deployer_size |
Defines the VM SKU to use, for example, Standard_D4s_v3 | Optional |
deployer_count |
Defines the number of deployers | Optional |
deployer_image |
Defines the VM image to use | Optional |
plan |
Defines the plan associated to the VM image | Optional |
deployer_disk_type |
Defines the disk type, for example, Premium_LRS | Optional |
deployer_use_DHCP |
Controls if the Azure subnet-provided IP addresses should be used (dynamic) true | Optional |
deployer_private_ip_address |
Defines the private IP address to use | Optional |
deployer_enable_public_ip |
Defines if the deployer has a public IP | Optional |
auto_configure_deployer |
Defines if the deployer is configured with the required software (Terraform and Ansible) | Optional |
add_system_assigned_identity |
Defines if the deployer is assigned a system identity | Optional |
The VM image is defined by using the following structure:
xxx_vm_image = {
os_type = ""
source_image_id = ""
publisher = "Canonical"
offer = "0001-com-ubuntu-server-focal"
sku = "20_04-lts"
version = "latest"
type = "marketplace"
}
Note
The type can be marketplace/marketplace_with_plan/custom.
Using an image of type marketplace_with_plan requires that the image in question was used at least once in the subscription. The first usage prompts the user to accept the license terms and the automation has no means to approve it.
Authentication parameters
This section defines the parameters used for defining the VM authentication.
| Variable | Description | Type |
|---|---|---|
deployer_vm_authentication_type |
Defines the default authentication for the deployer | Optional |
deployer_authentication_username |
Administrator account name | Optional |
deployer_authentication_password |
Administrator password | Optional |
deployer_authentication_path_to_public_key |
Path to the public key used for authentication | Optional |
deployer_authentication_path_to_private_key |
Path to the private key used for authentication | Optional |
Key vault parameters
This section defines the parameters used for defining the Azure Key Vault information.
| Variable | Description | Type |
|---|---|---|
user_keyvault_id |
Azure resource identifier for the user key vault. | Optional |
spn_keyvault_id |
Azure resource identifier for the key vault that contains the deployment credentials. | Optional |
deployer_private_key_secret_name |
The key vault secret name for the deployer private key. | Optional |
deployer_public_key_secret_name |
The key vault secret name for the deployer public key. | Optional |
deployer_username_secret_name |
The key vault secret name for the deployer username. | Optional |
deployer_password_secret_name |
The key vault secret name for the deployer password. | Optional |
additional_users_to_add_to_keyvault_policies |
A list of user object IDs to add to the deployment key vault access policies. | Optional |
set_secret_expiry |
Set expiry of 12 months for key vault secrets. | Optional |
DNS support
| Variable | Description | Type |
|---|---|---|
dns_label |
DNS name of the Private DNS zone. | Optional |
use_custom_dns_a_registration |
Uses an external system for DNS, set to false for Azure native. | Optional |
management_dns_subscription_id |
Subscription ID for the subscription that contains the Private DNS zone. | Optional |
management_dns_resourcegroup_name |
Resource group that contains the Private DNS zone. | Optional |
Other parameters
| Variable | Description | Type | Notes |
|---|---|---|---|
firewall_deployment |
Boolean flag that controls if an Azure firewall is to be deployed. | Optional | |
bastion_deployment |
Boolean flag that controls if Azure Bastion host is to be deployed. | Optional | |
bastion_sku |
SKU for Azure Bastion host to be deployed (Basic/Standard). | Optional | |
enable_purge_control_for_keyvaults |
Boolean flag that controls if purge control is enabled on the key vault. | Optional | Use only for test deployments. |
enable_firewall_for_keyvaults_and_storage |
Restrict access to selected subnets. | Optional |
Web App parameters
| Variable | Description | Type | Notes |
|---|---|---|---|
use_webapp |
Boolean value indicating if a webapp should be deployed. | Optional | |
app_service_SKU_name |
The SKU of the App Service Plan. | Optional | |
app_registration_app_id |
The app registration id to be used for the webapp. | Optional | |
webapp_client_secret |
The SKU of the App Service Plan. | Optional | Will be persisted in Key Vault |
Example parameters file for deployer (required parameters only)
# The environment value is a mandatory field, it is used for partitioning the environments, for example (PROD and NP)
environment="MGMT"
# The location/region value is a mandatory field, it is used to control where the resources are deployed
location="westeurope"
# management_network_address_space is the address space for management virtual network
management_network_address_space="10.10.20.0/25"
# management_subnet_address_prefix is the address prefix for the management subnet
management_subnet_address_prefix="10.10.20.64/28"
# management_firewall_subnet_address_prefix is the address prefix for the firewall subnet
management_firewall_subnet_address_prefix="10.10.20.0/26"
# management_bastion_subnet_address_prefix is a mandatory parameter if bastion is deployed and if the subnets are not defined in the workload or if existing subnets are not used
management_bastion_subnet_address_prefix = "10.10.20.128/26"
deployer_enable_public_ip=false
firewall_deployment=true
bastion_deployment=true
SAP library
The SAP library provides the persistent storage of the Terraform state files and the downloaded SAP installation media for the control plane.
The configuration of the SAP library is performed in a Terraform tfvars variable file.
Terraform parameters
This table shows the Terraform parameters. These parameters need to be entered manually if you aren't using the deployment scripts or Azure Pipelines.
| Variable | Description | Type | Notes |
|---|---|---|---|
deployer_tfstate_key |
State file name for the deployer | Required |
Environment parameters
This table shows the parameters that define the resource naming.
| Variable | Description | Type | Notes |
|---|---|---|---|
environment |
Identifier for the control plane (maximum of five characters) | Mandatory | For example, PROD for a production environment and NP for a nonproduction environment. |
location |
Azure region in which to deploy | Required | Use lowercase. |
name_override_file |
Name override file | Optional | See Custom naming. |
Resource group
This table shows the parameters that define the resource group.
| Variable | Description | Type |
|---|---|---|
resource_group_name |
Name of the resource group to be created | Optional |
resource_group_arm_id |
Azure resource identifier for an existing resource group | Optional |
resourcegroup_tags |
Tags to be associated with the resource group | Optional |
SAP installation media storage account
| Variable | Description | Type |
|---|---|---|
library_sapmedia_arm_id |
Azure resource identifier | Optional |
Terraform remote state storage account
| Variable | Description | Type |
|---|---|---|
library_terraform_state_arm_id |
Azure resource identifier | Optional |
DNS support
| Variable | Description | Type |
|---|---|---|
dns_label |
DNS name of the Private DNS zone. | Optional |
use_custom_dns_a_registration |
Use an existing Private DNS zone. | Optional |
management_dns_subscription_id |
Subscription ID for the subscription that contains the Private DNS zone. | Optional |
management_dns_resourcegroup_name |
Resource group that contains the Private DNS zone. | Optional |
Extra parameters
| Variable | Description | Type |
|---|---|---|
use_private_endpoint |
Use private endpoints. | Optional |
use_service_endpoint |
Use service endpoints for subnets. | Optional |
enable_firewall_for_keyvaults_and_storage |
Restrict access to selected subnets. | Optional |
subnets_to_add_to_firewall_for_keyvaults_and_storage |
Subnets that need access to key vaults and storage accounts. | Optional |
Example parameters file for the SAP library (required parameters only)
# The environment value is a mandatory field, it is used for partitioning the environments, for example (PROD and NP)
environment = "MGMT"
# The location/region value is a mandatory field, it is used to control where the resources are deployed
location = "westeurope"
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