rjohnson318 / az2tf

az2tf

This utility 'Azure to Terraform' (az2tf) reads an Azure Subscription and generates all the required terraform configuration files (.tf) from each of the composite Azure Resource Groups It also imports the terraform state using a

"terraform import ...." command

And finally runs a

"terraform plan ." command

There should hopefully be no subsequent additions or deletions reported by the terraform plan command as all the approriate terraform configuration files will have have automatically been created.

Supported Resource Types

The following terraform resource types are supported by this tool at this time:

Base Resources

• azurerm_resource_group (full)

Authorization Resources

• azurerm_role_definition (subscription level)
• azurerm_role_assignment (subscription level)

Active Directory Resources

Automation Resources

• azurerm_automation_account

Compute Resources

• azurerm_availability_set (full)
• azurerm_image
• azurerm_managed_disk (Common)
• azurerm_virtual_machine (Common)

Container Resources

• azurerm_container_registry (full)
• azurerm_kubernetes_cluster

Key Vault Resources

• azurerm_key_vault (Common)
• azurerm_key_vault_secret (full)

Load Balancer Resources

• azurerm_lb (full)
• azurerm_lb_backend_address_pool (full)
• azurerm_lb_rule (full)
• azure_nat_rule (full - needs more testing)
• azurerm_lb_probe (full)
• azure_nat_pool (full - needs more testing)

Management Resources

• azurerm_management_lock (full)

Network Resources

• azurerm_application_security_group (full)
• azurerm_express_route_circuit (full)
• azurerm_express_route_circuit_authorization (full)
• azurerm_express_route_circuit_peering (partial)
• azurerm_local_network_gateway
• azurerm_network_interface (Common)
• azurerm_network_security_group (full)
• azurerm_network_watcher
• azurerm_public_ip (Common)
• azurerm_route_table (full)
• azurerm_subnet (full)
• azurerm_virtual_network (full)
• azurerm_virtual_network_gateway
• azurerm_virtual_network_gateway_connection
• azurerm_virtual_network_peering (full)

Policy Resources

• azurerm_policy_definition (custom poicies only)
• azurerm_policy_assignment

OMS Resources

• azurerm_log_analytics_solution (partial)
• azurerm_log_analytics_workspace (full)

Recovery Services

• azurerm_recovery_services_vault (full)

Storage Resources

• azurerm_storage_account (Common - tf full support lacking)

(Full) = full support for all terraform attributes (Common) = support for the most Common terraform attributes (Partial) = support for some of the terraform attributes

Requirements & Prerequisites

• The tool is written for the bash shell script and has been tested on a MAC
• Azure cli2 version 2.0.31 or higher needs to be installed and you need a login with at least "Read" priviledges
• terraform needs to be installed

Quickstart guide to using the tool

Running the tool required these steps:

1. Unzip or clone this git repo into an empty directory
2. login to the Azure cli2 (az login)
3. run the tool giving the ID of a subscription as a paremeter ./az2tf.sh Your-subscription-ID

Be patient - lots of output is given as az2tf:

• Loops for each provider through your resource groups &
• Creates the requited *.tf configuration files
• Performs the necessary 'terraform import' commands
• And finally runs a 'terraform plan'

For smaller tests where all resources are contained in a single Resource Group run

./az2tf.sh Your-subscription-ID RG-Name

Planned Additions

• Application Gateways
• PaaS databases and apps
• Storage firewall rules
• ongoing better AKS support as AKS evolves
• Other terraform providers where terraform & Azure cli2 mutually support

Known problems

Speed

It is quite slow to loop around everything in large subscriptions, there are ways to speed this tool up (make fewer az cli command calls) but it would also make it harder to debug, I may look at doing this after I finish building out support for more providers.

KeyVault:

Can fail if your login/SPN doesn't have acccess to the KeyVault

Virtual machines:

These attributes always get reported in terraform plan set to false by default - may need to manually override

• delete_data_disks_on_termination: "" => "false"
• delete_os_disk_on_termination: "" => "false"

Storage Account

awaiting terraform support for VNet service endpoints/firewalling

Can fail if your login/SPN doesn't have acccess the KeyVault used for encryption

OMS

Not all OMS solutions can be imported (naming issues with Azure)

ExpressRoute

No support for MS peering (don't have one to test!)

Key Vault

terraform doesn't support Backup and Restore as certificate permissions

Virtual Network Gateway

if no bgp settings specified for VNet Gateway, terraform plan will report a benign change see issue in github

~ update in-place
Terraform will perform the following actions:

~ azurerm_virtual_network_gateway.rg-$RGNAME__vgw-$VGWNAME
	bgp_settings.#: "" => <computed>