Tutorial: Query a SQL Server Linux Docker container in a virtual network from an Azure Databricks notebook

Article
01/27/2022

This tutorial teaches you how to integrate Azure Databricks with a SQL Server Linux Docker container in a virtual network.

In this tutorial, you learn how to:

Deploy an Azure Databricks workspace to a virtual network
Install a Linux virtual machine in a public network
Install Docker
Install Microsoft SQL Server on Linux docker container
Query the SQL Server using JDBC from a Databricks notebook

Prerequisites

Create a Databricks workspace in a virtual network.
Install Ubuntu for Windows.
Download SQL Server Management Studio.

Create a Linux virtual machine

In the Azure portal, select the icon for Virtual Machines. Then, select + Add.
On the Basics tab, Choose Ubuntu Server 18.04 LTS and change the VM size to B2s. Choose an administrator username and password.
Navigate to the Networking tab. Choose the virtual network and the public subnet that includes your Azure Databricks cluster. Select Review + create, then Create to deploy the virtual machine.
When the deployment is complete, navigate to the virtual machine. Notice the Public IP address and Virtual network/subnet in the Overview. Select the Public IP Address
Change the Assignment to Static and enter a DNS name label. Select Save, and restart the virtual machine.
Select the Networking tab under Settings. Notice that the network security group that was created during the Azure Databricks deployment is associated with the virtual machine. Select Add inbound port rule.

Add a rule to open port 22 for SSH. Use the following settings:

Setting	Suggested value	Description
Source	IP Addresses	IP Addresses specifies that incoming traffic from a specific source IP Address will be allowed or denied by this rule.
Source IP addresses	<your public ip>	Enter your public IP address. You can find your public IP address by visiting bing.com and searching for "my IP".
Source port ranges	*	Allow traffic from any port.
Destination	IP Addresses	IP Addresses specifies that outgoing traffic for a specific source IP Address will be allowed or denied by this rule.
Destination IP addresses	<your vm public ip>	Enter your virtual machine's public IP address. You can find this on the Overview page of your virtual machine.
Destination port ranges	22	Open port 22 for SSH.
Priority	290	Give the rule a priority.
Name	ssh-databricks-tutorial-vm	Give the rule a name.

Add inbound security rule for port 22

Add a rule to open port 1433 for SQL with the following settings:

Setting	Suggested value	Description
Source	Any	Source specifies that incoming traffic from a specific source IP Address will be allowed or denied by this rule.
Source port ranges	*	Allow traffic from any port.
Destination	IP Addresses	IP Addresses specifies that outgoing traffic for a specific source IP Address will be allowed or denied by this rule.
Destination IP addresses	<your vm public ip>	Enter your virtual machine's public IP address. You can find this on the Overview page of your virtual machine.
Destination port ranges	1433	Open port 22 for SQL Server.
Priority	300	Give the rule a priority.
Name	sql-databricks-tutorial-vm	Give the rule a name.

Add inbound security rule for port 1433

Run SQL Server in a Docker container

Open Ubuntu for Windows, or any other tool that will allow you to SSH into the virtual machine. Navigate to your virtual machine in the Azure portal and select Connect to get the SSH command you need to connect.
Enter the command in your Ubuntu terminal and enter the admin password you created when you configured the virtual machine.
Use the following command to install Docker on the virtual machine.
```
sudo apt-get install docker.io
```
Verify the install of Docker with the following command:
```
sudo docker --version
```

Install the image.

sudo docker pull mcr.microsoft.com/mssql/server:2017-latest

Check the images.

sudo docker images

Run the container from the image.

sudo docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=Password1234' -p 1433:1433 --name sql1  -d mcr.microsoft.com/mssql/server:2017-latest

Verify that the container is running.

sudo docker ps -a

Create a SQL database

Open SQL Server Management Studio and connect to the server using the server name and SQL Authentication. The sign in username is SA and the password is the password set in the Docker command. The password in the example command is Password1234.

Once you've successfully connected, select New Query and enter the following code snippet to create a database, a table, and insert some records in the table.

CREATE DATABASE MYDB;
GO
USE MYDB;
CREATE TABLE states(Name VARCHAR(20), Capitol VARCHAR(20));
INSERT INTO states VALUES ('Delaware','Dover');
INSERT INTO states VALUES ('South Carolina','Columbia');
INSERT INTO states VALUES ('Texas','Austin');
SELECT * FROM states
GO

Query to create a SQL Server database

Query SQL Server from Azure Databricks

Navigate to your Azure Databricks workspace and verify that you created a cluster as part of the prerequisites. Then, select Create a Notebook. Give the notebook a name, select Python as the language, and select the cluster you created.
Use the following command to ping the internal IP Address of the SQL Server virtual machine. This ping should be successful. If not, verify that the container is running, and review the network security group (NSG) configuration.
```
%sh
ping 10.179.64.4
```
You can also use the nslookup command to review.
```
%sh
nslookup databricks-tutorial-vm.westus2.cloudapp.azure.com
```

Once you've successfully pinged the SQL Server, you can query the database and tables. Run the following python code:

jdbcHostname = "10.179.64.4"
jdbcDatabase = "MYDB"
userName = 'SA'
password = 'Password1234'
jdbcPort = 1433
jdbcUrl = "jdbc:sqlserver://{0}:{1};database={2};user={3};password={4}".format(jdbcHostname, jdbcPort, jdbcDatabase, userName, password)

df = spark.read.jdbc(url=jdbcUrl, table='states')
display(df)

Clean up resources

When no longer needed, delete the resource group, the Azure Databricks workspace, and all related resources. Deleting the job avoids unnecessary billing. If you're planning to use the Azure Databricks workspace in future, you can stop the cluster and restart it later. If you are not going to continue to use this Azure Databricks workspace, delete all resources you created in this tutorial by using the following steps:

From the left-hand menu in the Azure portal, click Resource groups and then click the name of the resource group you created.
On your resource group page, select Delete, type the name of the resource to delete in the text box, and then select Delete again.

Next steps

Advance to the next article to learn how to extract, transform, and load data using Azure Databricks.

Tutorial: Extract, transform, and load data by using Azure Databricks

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