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:

Unzip or clone this git repo into an empty directory
login to the Azure cli2 (az login)
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

jasonfare / az2tf