Terraform common modules

• app_config
• argocd_app
• azure_blob_storage
• azure_blob_storage_assets
• azure_service_bus
• firebase
• key_vault
• managed_identity
• mssql_database_user
• mssql_server
• posgresql
• tags

Warnings

Creating resource groups and using Azure modules in the same project

Azure modules (azure_blob_storage, azure_service_bus, key_vault) read resource group as a data source. Because azurerm_resource_group.name is known before apply, data sources will fail if the resource group is not yet created. You need to partially apply the resource group or pass it as depends_on. See the example.

Using mssql_server and mssql_database_user modules in the same project

MSSQL provider requires the database to be create before plan. You have to use partial apply to create the database first.

Creating AD users in postgresql module

Terraform cannot create an AD user for Postgres. Instead it generates a script to be applied on the database. More details in the module readme.

Modules relationships

A birds eye view of what is managed by a module and how they would typically interact with each other. For brevity, it ignores the fact that eventually all the modules have outputs that will be stored in app_config (connection strings, access keys, etc).

flowchart BT
    subgraph managed_identity
    direction LR
    managed_identity_identity[Azure Managed Identity]
    managed_identity_workload_identity[AKS Workload Identity]
    end

    subgraph mssql_server
    direction LR
    mssql_server_server[MSSQL Server]
    mssql_server_database[MSSQL Databases]
    mssql_server_firewall[Firewall configuration]
    mssql_server_admin[MSSQL AD Admin]
    end

    subgraph mssql_database_user
    direction LR
    mssql_database_user_user[MSSQL User]
    mssql_database_user_role[MSSQL User Roles]
    end

    subgraph app_config
    direction LR
    key_vault_secrets[Key Vault Secrets]
    access_policy[Key Vault access policy for application]
    configmaps[Kubernetes Config Maps]
    secrets[Kubernetes Secrets]
    end

    subgraph key_vault
    direction LR
    key_vault_vault[Azure Key Vault]
    key_vault_deploy_policy[Key Vault access policy for management]
    end

    subgraph azure_service_bus
    direction LR
    azure_service_bus_namespace[Azure Service Bus]
    azure_service_bus_access[Access role for application]
    end

    subgraph azure_blob_storage
    direction LR
    azure_blob_storage_account[Azure Storage Account]
    azure_blob_storage_container[Blob Storage Containers]
    azure_blob_storage_access[Access role for application]
    end

    subgraph azure_blob_storage_assets
    storage_assets[Files uploaded to Blob Storage]
    end

    subgraph postgresql
    direction LR
    postgresql_server[Postgres Flexible Server]
    postgresql_database[Postgres Databases]
    postgresql_roles[Postgres Roles]
    postgresql_admin[Postgres AD Admin]
    postgresql_firewall[Firewall configuration]
    end

    subgraph firebase
    firebase_app[Firebase]
    end

    subgraph argocd
    argocd_config[ArgoCD apps setup]
    end

    mssql_database_user --> managed_identity
    app_config --> managed_identity
    mssql_database_user --> mssql_server
    app_config --> key_vault

    azure_blob_storage --> managed_identity
    azure_blob_storage_assets --> azure_blob_storage
    azure_service_bus --> managed_identity
    postgresql --> managed_identity

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