Quickstart: Create an instance of Azure Database for MySQL - Flexible Server by using Terraform

APPLIES TO: Azure Database for MySQL - Flexible Server

This quickstart was tested by using the following Terraform and Terraform provider versions:

Azure Database for MySQL - Flexible Server is a managed service that you use to run, manage, and scale highly available MySQL databases in the cloud. You can use an Azure Resource Manager template (ARM template) to provision Azure Database for MySQL - Flexible Server to deploy multiple servers or to deploy multiple databases on a server.

This article shows you how to use Terraform to deploy an instance of Azure Database for MySQL - Flexible Server and a database in a virtual network.

In this article, you learn how to:

Note

The example code that appears in this article is located in the Azure Terraform GitHub repo.

Prerequisites

Implement the Terraform code

  1. Create a directory that you can use to test the sample Terraform code. Make the Terraform directory the current directory.

  2. Create a file named providers.tf and insert the following code:

    terraform {
      required_version = ">=1.0"
    
      required_providers {
        azurerm = {
          source  = "hashicorp/azurerm"
          version = "~>3.0"
        }
    
        random = {
          source  = "hashicorp/random"
          version = "~>3.0"
        }
      }
    }
    
    provider "azurerm" {
      features {}
    }
    
  3. Create a file named main.tf and insert the following code:

    # Generate random resource group name
    resource "random_pet" "rg_name" {
      prefix = var.resource_group_name_prefix
    }
    
    resource "azurerm_resource_group" "rg" {
      location = var.resource_group_location
      name     = random_pet.rg_name.id
    }
    
    # Generate random value for the name
    resource "random_string" "name" {
      length  = 8
      lower   = true
      numeric = false
      special = false
      upper   = false
    }
    
    # Generate random value for the login password
    resource "random_password" "password" {
      length           = 8
      lower            = true
      min_lower        = 1
      min_numeric      = 1
      min_special      = 1
      min_upper        = 1
      numeric          = true
      override_special = "_"
      special          = true
      upper            = true
    }
    
    # Manages the Virtual Network
    resource "azurerm_virtual_network" "default" {
      address_space       = ["10.0.0.0/16"]
      location            = azurerm_resource_group.rg.location
      name                = "vnet-${random_string.name.result}"
      resource_group_name = azurerm_resource_group.rg.name
    }
    
    # Manages the Subnet
    resource "azurerm_subnet" "default" {
      address_prefixes     = ["10.0.2.0/24"]
      name                 = "subnet-${random_string.name.result}"
      resource_group_name  = azurerm_resource_group.rg.name
      virtual_network_name = azurerm_virtual_network.default.name
      service_endpoints    = ["Microsoft.Storage"]
    
      delegation {
        name = "fs"
    
        service_delegation {
          name = "Microsoft.DBforMySQL/flexibleServers"
          actions = [
            "Microsoft.Network/virtualNetworks/subnets/join/action",
          ]
        }
      }
    }
    
    # Enables you to manage Private DNS zones within Azure DNS
    resource "azurerm_private_dns_zone" "default" {
      name                = "${random_string.name.result}.mysql.database.azure.com"
      resource_group_name = azurerm_resource_group.rg.name
    }
    
    # Enables you to manage Private DNS zone Virtual Network Links
    resource "azurerm_private_dns_zone_virtual_network_link" "default" {
      name                  = "mysqlfsVnetZone${random_string.name.result}.com"
      private_dns_zone_name = azurerm_private_dns_zone.default.name
      resource_group_name   = azurerm_resource_group.rg.name
      virtual_network_id    = azurerm_virtual_network.default.id
    
      depends_on = [azurerm_subnet.default]
    }
    
    # Manages the MySQL Flexible Server
    resource "azurerm_mysql_flexible_server" "default" {
      location                     = azurerm_resource_group.rg.location
      name                         = "mysqlfs-${random_string.name.result}"
      resource_group_name          = azurerm_resource_group.rg.name
      administrator_login          = random_string.name.result
      administrator_password       = random_password.password.result
      backup_retention_days        = 7
      delegated_subnet_id          = azurerm_subnet.default.id
      geo_redundant_backup_enabled = false
      private_dns_zone_id          = azurerm_private_dns_zone.default.id
      sku_name                     = "GP_Standard_D2ds_v4"
      version                      = "8.0.21"
    
      high_availability {
        mode                      = "SameZone"
      }
      maintenance_window {
        day_of_week  = 0
        start_hour   = 8
        start_minute = 0
      }
      storage {
        iops    = 360
        size_gb = 20
      }
    
      depends_on = [azurerm_private_dns_zone_virtual_network_link.default]
    }
    
  4. Create a file named mysql-fs-db.tf and insert the following code:

    # Manages the MySQL Flexible Server Database
    resource "azurerm_mysql_flexible_database" "main" {
      charset             = "utf8mb4"
      collation           = "utf8mb4_unicode_ci"
      name                = "mysqlfsdb_${random_string.name.result}"
      resource_group_name = azurerm_resource_group.rg.name
      server_name         = azurerm_mysql_flexible_server.default.name
    }
    
  5. Create a file named variables.tf and insert the following code:

    variable "resource_group_location" {
      type        = string
      default     = "westeurope"
      description = "Location of the resource group."
    }
    
    variable "resource_group_name_prefix" {
      type        = string
      default     = "mysql-fs-db-rg"
      description = "Prefix of the resource group name that's combined with a random ID so name is unique in your Azure subscription."
    }
    
  6. Create a file named outputs.tf and insert the following code:

    output "azurerm_mysql_flexible_server" {
      value = azurerm_mysql_flexible_server.default.name
    }
    
    output "admin_login" {
      value = azurerm_mysql_flexible_server.default.administrator_login
    }
    
    output "admin_password" {
      sensitive = true
      value     = azurerm_mysql_flexible_server.default.administrator_password
    }
    
    output "mysql_flexible_server_database_name" {
      value = azurerm_mysql_flexible_database.main.name
    }
    
    output "resource_group_name" {
      value = azurerm_resource_group.rg.name
    }
    

Initialize Terraform

Run terraform init to initialize the Terraform deployment. This command downloads the Azure provider required to manage your Azure resources.

terraform init -upgrade

Key points:

  • The -upgrade parameter upgrades the necessary provider plugins to the newest version that complies with the configuration's version constraints.

Create a Terraform execution plan

Run terraform plan to create an execution plan.

terraform plan -out main.tfplan

Key points:

  • The terraform plan command creates an execution plan, but doesn't execute it. Instead, it determines what actions are necessary to create the configuration specified in your configuration files. This pattern allows you to verify whether the execution plan matches your expectations before making any changes to actual resources.
  • The optional -out parameter allows you to specify an output file for the plan. Using the -out parameter ensures that the plan you reviewed is exactly what is applied.

Apply a Terraform execution plan

Run terraform apply to apply the execution plan to your cloud infrastructure.

terraform apply main.tfplan

Key points:

  • The example terraform apply command assumes you previously ran terraform plan -out main.tfplan.
  • If you specified a different filename for the -out parameter, use that same filename in the call to terraform apply.
  • If you didn't use the -out parameter, call terraform apply without any parameters.

Verify the results

To display the Azure Database for MySQL - Flexible Server database, run az mysql flexible-server db show:

az mysql flexible-server db show \
    --resource-group <resource_group_name> \
    --server-name <azurerm_mysql_flexible_server> \
    --database-name <mysql_flexible_server_database_name>

Consider the following key points:

  • The values for <resource_group_name>, <azurerm_mysql_flexible_server>, and <mysql_flexible_server_database_name> are displayed in the terraform apply output. You can also run the terraform output command to view these values.

Clean up resources

When you no longer need the resources created via Terraform, do the following steps:

  1. Run terraform plan and specify the destroy flag.

    terraform plan -destroy -out main.destroy.tfplan
    

    Key points:

    • The terraform plan command creates an execution plan, but doesn't execute it. Instead, it determines what actions are necessary to create the configuration specified in your configuration files. This pattern allows you to verify whether the execution plan matches your expectations before making any changes to actual resources.
    • The optional -out parameter allows you to specify an output file for the plan. Using the -out parameter ensures that the plan you reviewed is exactly what is applied.
  2. Run terraform apply to apply the execution plan.

    terraform apply main.destroy.tfplan
    

Troubleshoot Terraform on Azure

Explore how to troubleshoot common problems for using Terraform on Azure.

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