Tutorial: Connect an AKS app to Azure SQL Database (preview)

In this tutorial, you learn how to connect an application deployed to AKS, to an Azure SQL Database, using service connector (preview). You complete the following tasks:

• Create an Azure SQL Database resource
• Create a connection between the AKS cluster and the database with Service Connector.
• Update your container
• Update your application code
• Clean up Azure resources.

Warning

Microsoft recommends that you use the most secure authentication flow available. The authentication flow described in this procedure requires a very high degree of trust in the application, and carries risks that are not present in other flows. You should only use this flow when other more secure flows, such as managed identities, aren't viable. See the tutorial using a managed identity.

Prerequisites

• An Azure account with an active subscription. Create an account for free.
• An application deployed to AKS.

• • Use the Bash environment in Azure Cloud Shell. For more information, see Quickstart for Bash in Azure Cloud Shell.

    

  • If you prefer to run CLI reference commands locally, install the Azure CLI. If you're running on Windows or macOS, consider running Azure CLI in a Docker container. For more information, see How to run the Azure CLI in a Docker container.

    • If you're using a local installation, sign in to the Azure CLI by using the az login command. To finish the authentication process, follow the steps displayed in your terminal. For other sign-in options, see Sign in with the Azure CLI.

    • When you're prompted, install the Azure CLI extension on first use. For more information about extensions, see Use extensions with the Azure CLI.

    • Run az version to find the version and dependent libraries that are installed. To upgrade to the latest version, run az upgrade.

Create an Azure SQL Database

1. Create a resource group to store the Azure resources you create in this tutorial using the az group create command.

   az group create \
       --name $RESOURCE_GROUP \
       --location eastus
   

2. Follow the instructions to create an Azure SQL Database in the resource group you created in the previous step. Make note of the server name, database name, and the database credentials for use throughout this tutorial.

Create a service connection in AKS with Service Connector (preview)

Register the Service Connector and Kubernetes Configuration resource providers

Register the Service Connector and Kubernetes Configuration resource providers using the az provider register command.

az provider register --namespace Microsoft.ServiceLinker

az provider register --namespace Microsoft.KubernetesConfiguration

Tip

You can check if these resource providers are already registered using the az provider show --namespace "Microsoft.ServiceLinker" --query registrationState and az provider show --namespace "Microsoft.KubernetesConfiguration" --query registrationState commands. If the output is Registered, then the service provider is already registered.

Create a new connection

Create a service connection between your AKS cluster and your SQL database in the Azure portal or the Azure CLI.

Azure portal

1. In the Azure portal, navigate to your AKS cluster resource.

2. Select Settings > Service Connector (Preview) > Create.

3. On the Basics tab, configure the following settings:

   • Kubernetes namespace: Select default.
   • Service type: Select SQL Database.
   • Connection name: Use the connection name provided by Service Connector or enter your own connection name.
   • Subscription: Select the subscription that includes the Azure SQL Database service.
   • SQL server: Select your SQL server.
   • SQL database: Select your SQL database.
   • Client type: The code language or framework you use to connect to the target service, such as Python.

   

4. Select Next: Authentication. On the Authentication tab, enter your database username and password.

5. Select Next: Networking > Next: Review + create >Create.

6. Once the deployment is successful, you can view information about the new connection in the Service Connector pane.

Azure CLI

Create a service connection to the SQL database using the az aks connection create sql command. You can run this command in two different ways:

• generate the new connection step by step.

  az aks connection create sql
  

• generate the new connection at once. Make sure you replace the following placeholders with your own information: <source-subscription>, <source_resource_group>, <cluster>, <target-subscription>, <target_resource_group>, <server>, <database>, and <***>.

  az aks connection create sql \
     --source-id /subscriptions/<source-subscription>/resourceGroups/<source_resource_group>/providers/Microsoft.ContainerService/managedClusters/<cluster> \
     --target-id /subscriptions/<target-subscription>/resourceGroups/<target_resource_group>/providers/Microsoft.Sql/servers/<server>/databases/<database> \
     --secret name=<secret-name> secret=<secret>
  

Update your container

Now that you created a connection between your AKS cluster and the database, you need to retrieve the connection secrets and deploy them in your container.

1. In the Azure portal, navigate to your AKS cluster resource and select Service Connector (Preview).

2. Select the newly created connection, and then select YAML snippet. This action opens a panel displaying a sample YAML file generated by Service Connector.

3. To set the connection secrets as environment variables in your container, you have two options:

   • Directly create a deployment using the YAML sample code snippet provided. The snippet includes highlighted sections showing the secret object that will be injected as the environment variables. Select Apply to proceed with this method.

     

   • Alternatively, under Resource Type, select Kubernetes Workload, and then select an existing Kubernetes workload. This action sets the secret object of your new connection as the environment variables for the selected workload. After selecting the workload, select Apply.

     

Update your application code

As a final step, update your application code to use your environment variables, by following these instructions.

Clean up resources

If you no longer need the resources you created when following this tutorial, you can remove them by deleting the Azure resource group.

Delete your resource group using the az group delete command.

az group delete --resource-group $RESOURCE_GROUP

Related content

Read the following articles to learn more about Service Connector concepts and how it helps AKS connect to Azure services:

• Use Service Connector to connect AKS clusters to other cloud services
• Learn about Service Connector concepts