WebSitesInProduction

Web Sites in Production

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Overview

Microsoft Azure offers secure and flexible development, deployment and scaling options for any size web application. Leverage your existing tools to create and deploy applications without the hassle of managing infrastructure.

Provision a production web application on your own in minutes by easily deploying content created using your favorite development tool. You can deploy an existing site directly from source control with support for Git, GitHub, Bitbucket, CodePlex, TFS, and even DropBox. Deploy directly from your favorite IDE or from scripts using PowerShell in Windows or CLI tools running on any OS. Once deployed, keep your sites constantly up-to-date with support for continuous deployment.

Microsoft Azure provides scalable, durable cloud storage, backup, and recovery solutions for any data, big or small. When deploying applications to a production environment, storage services such as Tables, Blobs and SQL Databases help you scale your application in the cloud.

With SQL Databases, it is important to keep your productive database up-to-date when deploying new versions of your application. Thanks to Entity Framework Migrations, the development and deployment of your data model has been simplified to update your environments in minutes.

This hands-on lab will show you the different topics you could encounter when deploying your site to production environments in Microsoft Azure.

Objectives

In this hands-on lab, you will learn how to:

• Enable Entity Framework Migrations with an existing model
• Update the object model and database accordingly using Entity Framework Migrations
• Deploy to a Microsoft Azure Web App using Git
• Rollback to a previous deployment using the Azure Portal
• Use Azure Storage to scale a Web App
• Configure auto-scaling for a Web App using the Azure Portal
• Create and configure a load test project in Visual Studio

Prerequisites

The following is required to complete this hands-on lab:

• Visual Studio Community 2015 or greater

• Azure SDK for Visual Studio 2015 or later

• GIT Version Control System

• Enable the ASP.NET Core command-line tools. Open a command-prompt and run:

   dnvm upgrade
  

• A Microsoft Azure subscription

  • Sign up for a Free Trial
  • If you are a Visual Studio Professional, Test Professional, Premium or Ultimate with MSDN or MSDN Platforms subscriber, activate your MSDN benefit now to start developing and testing on Microsoft Azure
  • BizSpark members automatically receive the Microsoft Azure benefit through their Visual Studio Ultimate with MSDN subscriptions
  • Members of the Microsoft Partner Network Cloud Essentials program receive monthly Microsoft Azure credits at no charge

Note: You can take advantage of the Visual Studio Dev Essentials subscription in order to get everything you need to build and deploy your app on any platform.

Setup

In order to run the exercises in this hands-on lab, you will need to set up your environment first.

1. Open Windows Explorer and browse to the lab's Source folder.
2. Right-click on Setup.cmd and select Run as administrator to launch the setup process that will configure your environment and install the Visual Studio code snippets for this lab.
3. If the User Account Control dialog box is shown, confirm the action to proceed.

Note: Make sure you have checked all the dependencies for this lab before running the setup.

Using the Code Snippets

Throughout the lab document, you will be instructed to insert code blocks. For your convenience, most of this code is provided as Visual Studio Code Snippets, which you can access from within Visual Studio 2015 to avoid having to add it manually.

Note: Each exercise is accompanied by a starting solution located in the Begin folder of the exercise that allows you to follow each exercise independently of the others. Please be aware that the code snippets that are added during an exercise are missing from these starting solutions and may not work until you have completed the exercise. Inside the source code for an exercise, you will also find an End folder containing a Visual Studio solution with the code that results from completing the steps in the corresponding exercise. You can use these solutions as guidance if you need additional help as you work through this hands-on lab.

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Exercises

This hands-on lab includes the following exercises:

1. Using Entity Framework Migrations
2. Deploying a Web Site to Staging
3. Performing Deployment Rollback in Production
4. Scaling Using Azure Storage
5. Using Autoscale for Web Sites (Optional for Visual Studio 2015 Ultimate edition)

Estimated time to complete this lab: 75 minutes

Note: When you first start Visual Studio, you must select one of the predefined settings collections. Each predefined collection is designed to match a particular development style and determines window layouts, editor behavior, IntelliSense code snippets, and dialog box options. The procedures in this lab describe the actions necessary to accomplish a given task in Visual Studio when using the General Development Settings collection. If you choose a different settings collection for your development environment, there may be differences in the steps that you should take into account.

Exercise 1: Using Entity Framework Migrations

When you are developing an application, your data model might change over time. These changes could affect the existing model in your database (if you are creating a new version) and it is important to keep your database up-to-date to prevent errors.

To simplify the tracking of these changes in your model, Entity Framework Code First Migrations automatically detect changes comparing your model with the database schema and generates specific code to update your database, creating new versions of your database.

This exercise shows you how to enable Migrations for your application and how you can easily detect and generate changes to update your databases.

Task 1 - Enabling Migrations

In this task, you will go through the steps of enabling Entity Framework Code First Migrations to the Geek Quiz database, changing the model and understanding how those changes are reflected in the database.

1. Open the GeekQuiz.sln solution file from Source\Ex1-UsingEntityFrameworkMigrations\Begin in Visual Studio.

2. Build the solution in order to download and install the NuGet package dependencies. To do this, right-click the solution and click Build Solution or press Ctrl + Shift + B.

3. In the Solution Explorer, select the GeekQuiz project and press Shift + Alt + , to open a Command Prompt in the folder where the project is located.

4. In the Command Prompt you just opened, enter the following command and then press Enter. An initial migration based on the existing model will be created.

   dnx ef migrations add InitialMigration --context TriviaDbContext

   

   Creating the initial migration

   Note: Make sure that there is no database named "GeekQuizProd" in your LocalDB instance.

   Note: dnx ef migrations add will scaffold the next migration based on changes you have made to your model since the last migration was created. In this case, being the first migration of the project, it will add the scripts to create all the tables defined in the TriviaDbContext class.

5. Back in Visual Studio, verify that the new migration was created inside the TriviaDb folder located under the Migrations folder.

   

   Verifying the initial migration

6. Execute the migration to update the database by running the following command in the Command Prompt.

   Note: dnx ef database update will apply any pending migrations to the database. In this case, it will create the database using the connection string defined in your appsettings.json file.

   dnx ef database update --context TriviaDbContext

   

7. Go to the View menu and open SQL Server Object Explorer.

   

   Open in SQL Server Object Explorer

8. In the SQL Server Object Explorer window, verify that you have the (localdb)\MSSQLLocalDB database in the list. If the database is not in the list, connect to your LocalDB instance by right-clicking the SQL Server node and selecting Add SQL Server....

   

   Adding a SQL Server instance to SQL Server Object Explorer

9. Open the GeekQuizProd database and expand the Tables node. As you can see, the dnx ef database update command generated all the tables defined in the TriviaDbContext class. Locate the dbo.TriviaQuestion table and open the columns node. In the next task, you will add a new column to this table and update the database using Migrations.

   

   Trivia Questions Columns

Task 2 - Updating Database Schema Using Migrations

In this task, you will use Entity Framework Code First Migrations to detect a change in your model and generate the necessary code to update the database. You will update the TriviaQuestion entity by adding a new property to it. Then you will run commands to create a new Migration to include the new column in the table.

1. In Solution Explorer, double-click the TriviaQuestion.cs file located in the Models folder.

2. Add a new property named Hint, as shown in the following code snippet.

   public class TriviaQuestion
   {
       [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
       public int Id { get; set; }
   
       [Required]
       public string Title { get; set; }
   
       public virtual List<TriviaOption> Options { get; set; }
   
       public string Hint { get; set; }
   }

3. Switch back to the Command Prompt, enter the following command and then press Enter. A new migration will be created reflecting the change in our model.

   dnx ef migrations add QuestionHint --context TriviaDbContext

   

   Adding the QuestionHint migration

   Note: A Migration file is composed of two methods, Up and Down.

   • The Up method will be used to specify the changes the current version of our application needs to apply to the database.
   • The Down method is used to reverse the changes we have added to the Up method.

   When the Database Migration updates the database, it will run all migrations that have not been used since the last update in the timestamp (The _EFMigrationsHistory table keeps track of which migrations have been applied). The Up method of all migrations will be called and will make the changes we have specified to the database. If we decide to go back to a previous migration, the Down method will be called to redo the changes in reverse order.

4. In the Command Prompt, enter the following command and then press Enter.

   dnx ef database update --context TriviaDbContext

   

   Applying the QuestionHint migration

5. In SQL Server Object Explorer, refresh the dbo.TriviaQuestion table and check that the new Hint column is displayed.

   

   Checking the new Hint Column

Exercise 2: Deploying a Web Site to Staging

Azure Web Apps enables you to perform staged publishing. When you deploy your site to an Azure Web App, you can choose to deploy it to a separate deployment slot instead of the default production slot. And then swap the deployments in these two slots with no down time. This is really useful for validating changes before releasing to the public, incrementally integrating site content, and rolling back if changes are not working as expected.

In this exercise, you will deploy the Geek Quiz application to the staging environment of your Azure Web App using Git source control. To do this, you will create the Web App and provision the required components at the management portal, configure a Git repository and push the application source code from your local computer to a deployment slot. You will also update your production database with the Code First Migrations you created in the previous exercise. You will then execute the application in this staging environment to verify its operation. Once you are satisfied that it is working according to your expectations, you will promote the application to production.

Note: To enable staged publishing, the Web App must be on one of the Standard plans. Note that additional charges will be incurred if you upgrade your Web App to a Standard plan. For more information about pricing, see App Service Pricing.

Task 1 - Creating a Microsoft Azure Web App

In this task, you will create a Microsoft Azure Web App from the management portal. You will also configure a SQL Database to persist the application data, and configure a local Git repository for source control.

1. Go to the Azure Portal and sign in using the Microsoft account associated with your subscription.

   

   Sign in to the Azure Portal

2. Click New in the left command bar and then search for Web App + SQL.

   

   Searching for Web App + SQL

3. Select Web App + SQL from the list.

   

   Selecting Web App + SQL

4. In the Web App + SQL blade, click Create in order to continue to the configuration of the site.

   

   Creating the Web App + SQL

5. In the new Web App + SQL blade, select a Resource Group or create a new one. Then, click App Service Name, provide an available URL (e.g. geekquiz-site), create a new AppService Plan, then choose the pricing tier and location. Finally, click OK.

   

   Configure the new Web App

6. Next, select Database and create a new database, specifying the required information for the new server. Then, click OK in both New server and New database blades.

   

   Configure a new SQL Database

7. Finally, in the Web App + SQL blade, click Create and wait until the Web App is created.

   Note: By default, Microsoft Azure provides domains at azurewebsites.net but also gives you the possibility to set custom domains using the Azure Portal. However, you cannot use custom domains with a free Web App.

   Microsoft Azure offers 5 plans for users to run their Web Apps - Free, Shared, Basic, Standard and Premium. In Free and Shared, all Web Apps run in a multi-tenant environment and have quotas for CPU, Memory, and Network usage. You can mix and match which sites are Free (strict quotas) vs. Shared (more flexible quotas). The maximum number of free Web Apps may vary with your plan. In Standard, you choose which Web Apps run on dedicated virtual machines that correspond to the standard Azure compute resources. You can change the mode of your Web App by clicking the Pricing tier tile in the Usage section of the corresponding App Service plan blade.

   

   If you are using Shared or Standard, you will be able to manage custom domains for your Web Apps by going to your Web App's Settings blade and clicking Custom domains and SSL.

   

8. Once the Web app is created, select it and click the Browse button to validate that the new Web app is running.

   

   Browsing to the new web app

   

   Web app running

Task 2 - Deploying Geek Quiz to Staging Using Git

In this task, you will create a staging deployment slot for your Web App. Then, you will use Git to publish the Geek Quiz application directly from your local computer to the staging environment of your Web App.

1. Go back to the portal and open your Web App.

2. Select Scale Up (App Service Plan) in the Settings blade of your web app.

   

   Scaling up the App Service Plan

3. If your Web App is not on a Standard plan, select one by clicking the Pricing tier tile. For instance, select the S1 Standard plan.

   

   Upgrading the Web app to a Standard plan

4. Click Continuous deployment in the Settings blade of your web app and then choose Local Git Repository as source. Then, click OK to save the changes.

   

   Configuring the Git Deployment in staging Web App

5. Now, click Deployment credentials in the Settings blade of your web app to configure the user that will perform the deployments. Fill in the credentials and then click Save at the top.

   

   Setting deployment credentials

6. Back in the Settings blade, select Deployment slots.

   

   Opening deployment slots

7. Click the Add Slot command at the top and create a new slot named staging. Set your Web App as Configuration Source and then click OK.

   

   Creating deployment slot

8. After a few seconds you will see a new slot with the name of your Web App followed by -staging. Select it to navigate to the staging Web App settings.

   

   Navigating to the staging Web App

9. Repeat Step 4 to configure continuous deployment in the staging Web App using Local Git Repository as source.

10. Now, click the staging Web App Settings command, select Properties and then copy the GIT URL value. You will use it later in this exercise.

    

    Copying the Git URL value

11. Open a new Git Bash console and execute the following commands. Update the [YOUR-APPLICATION-PATH] placeholder with the path to the GeekQuiz solution, located in the Source\Ex2-DeployingWebSiteToStaging\Begin folder of this lab.

    cd "[YOUR-APPLICATION-PATH]"
    git init
    git config --global user.email "{username@example.com}"
    git config --global user.name "{your-user-name}"
    git add .
    git commit -m "Initial commit"
    

12. Run the following command to push your site to the remote Git repository. Replace the placeholder with the URL you obtained from the Azure Portal.

    Note: When you deploy content to the FTP host or GIT repository of a Microsoft Azure Web App you must authenticate using the deployment credentials that you configured in a previous step. If you do not know your deployment credentials you can easily reset them in the Azure Portal by opening the Web App Settings and clicking Deployment credentials. These deployment credentials are valid for all the Web Apps associated with your subscription.

    git remote add azure [GIT-URL-STAGING-SLOT]
    git push azure master
    

13. In order to verify that the site was successfully deployed, go back to the Azure Portal and select your Web App.

14. Navigate to the staging slot of this Web App by clicking Deployment slots in the Settings blade and then selecting its row inside the Deployments blade.

15. In the staging Web App, verify that there is an Active deployment with your "initial commit" in the Continuous deployment blade.

    

    Active deployment

16. Finally, click the Browse command to navigate to the deployed site.

    

    Browse site

17. If the application was successfully deployed, you will see the Geek Quiz Log in page.

    Note: The address URL of the deployed application contains the name of your Web App followed by -staging.

    

    Application running in the staging environment

18. If you wish to explore the application, click Register to configure a new user. Complete the account details by entering a user name, email address and password. Next, the application shows the first question of the quiz. Answer a few questions to make sure it is working as expected.

    

    Application ready to be used

Task 3 - Promoting the Web App to Production

Now that you have verified that the site is working correctly in the deployment slot, you are ready to promote it to production. In this task, you will swap the site in a staging slot with the production slot.

1. Go back to the Azure Portal and navigate to the staging Web App.

2. Click the Swap command at the top.

   

   Swap to production

3. Verify that the Source targets the staging slot and the Destination targets production, and then click OK to proceed with the swap operation. Azure will immediately swap the content of the production site with the content of the staging site.

   Note: Some settings from the staged version will automatically be copied to the production version (e.g. connection string overrides, handler mappings, etc.) but others will stay the same (e.g. DNS endpoints, SSL bindings, etc.).

   

   Confirming swap operation

4. Once the swap is complete, browse to your Web App in both slots. You can verify that the production site is now the one with the GeekQuiz site.

   Note: You might need to refresh your browser to clear the cache. In Microsoft Edge, you can do this by pressing CTRL+F5.

   

5. In the GitBash console, update the remote URL for the local Git repository to target the production slot. To do this, run the following command replacing the placeholders with your deployment username and the name of your Web App.

   Note: In the following exercises, you will push changes to the production site instead of staging just for the simplicity of the lab. In a real-world scenario, it is recommended to verify the changes in the staging environment before promoting to production.

   git remote set-url azure https://<your-user>@<your-web-site>.scm.azurewebsites.net:443/<your-web-site>.git
   

Exercise 3: Performing Deployment Rollback in Production

There are scenarios where you do not have a staging slot to perform hot swap between staging and production, for example, if you are working with Web Apps running in Free or Shared mode. In those scenarios, you should test your application in a testing environment (either locally or in a remote site) before deploying to production. However, it is possible that an issue not detected during the testing phase may arise in the production site. In this case, it is important to have a mechanism to easily switch to a previous and more stable version of the application as quickly as possible.

In Azure Web Apps, continuous deployment from source control makes this possible thanks to the Redeploy action available in the Azure Portal. Microsoft Azure keeps track of the deployments associated with the commits pushed to the repository and provides an option to redeploy your application using any of your previous deployments, at any time.

In this exercise you will perform a change to the code in the Geek Quiz application that intentionally injects a bug. You will deploy the application to production to see the error, and then you will take advantage of the redeploy feature to go back to the previous state.

Task 1 - Updating the Geek Quiz Application

In this task, you will refactor a small piece of code from the TriviaController class by extracting part of the logic that retrieves the selected quiz option from the database to a new method.

1. Switch to the Visual Studio instance with the GeekQuiz solution from the previous exercise.

2. In Solution Explorer, open the AnswersService.cs file in the Services folder.

3. Replace the StoreAsync method implementation with the following code snippet.

   (Code Snippet - WebSitesInProduction - Ex3 - StoreAsync)

   public async Task<bool> StoreAsync(TriviaAnswer answer)
   {
       var selectedOption = await this.db.TriviaOptions.FirstOrDefaultAsync(o =>
           MatchesOption(answer, o));
   
       if (selectedOption != null)
       {
           answer.TriviaOption = selectedOption;
           this.db.TriviaAnswers.Add(answer);
   
           await this.db.SaveChangesAsync();
       }
   
       return selectedOption.IsCorrect;
   }
   
   private static bool MatchesOption(TriviaAnswer answer, TriviaOption o)
   {
       var a = answer.OptionId / 0;
       return o.Id == answer.OptionId
                               && o.QuestionId == answer.QuestionId;
   }

4. Press CTRL + S to save the changes.

Task 2 - Redeploying the Geek Quiz Application

You will now push the changes you made in the previous task to the repository, which will trigger a new deployment to the production environment. Then, you will troubleshoot an issue using the F12 development tools provided by Microsoft Edge and then perform a rollback to the previous deployment from the Azure Portal.

1. Open a new Git Bash console to deploy the updated application to Azure Web Apps.

2. Execute the following commands to push the changes to Microsoft Azure. Update the [YOUR-APPLICATION-PATH] placeholder with the path to the GeekQuiz solution. You will be prompted for your deployment password.

   cd "[YOUR-APPLICATION-PATH]"
   git add .
   git commit -m "Refactored answer check"
   git push azure master
   

3. Open Microsoft Edge and navigate to your site (e.g. http://geek-quiz-site.azurewebsites.net/). Log in with your user credentials.

4. Press F12 to launch the development tools, select the Network tab and click the Clear Session button.

   

   Starting network recording

5. Select any of the quiz options. You will see that nothing happens.

6. In the F12 window, the entry corresponding to the POST HTTP request shows an HTTP 500 result.

   

   HTTP 500 error

7. Select the Console tab. An error is logged with the details of the cause. This error is caused by the code refactoring you committed in the previous steps

   

   Logged error

8. Do not close the browser.

9. In a new browser instance, navigate to the Azure Portal and sign in using the Microsoft account associated with your subscription.

10. Select App Services and click the Web app you created in Exercise 2.

11. Open the Deployments blade by clicking the Continuous deployment option in the Settings blade. Notice that all the commits performed are listed in the deployment history.

    

    List of existing deployments

12. Select the previous commit and then click Redeploy on the command bar.

    

    Redeploying the previous commit

13. When prompted to confirm, click Yes.

    

14. When the deployment completes, switch back to the browser instance with your site and press CTRL + F5.

15. Click any of the options. The flip animation will now take place and the result (correct/incorrect) will be displayed.

16. (Optional) Switch to the Git Bash console and execute the following commands to revert to the previous commit.

    Note: These commands create a new commit that undoes all changes in the Git repository that were made in the bad commit. Azure will then redeploy the application using the new commit.

    git revert HEAD --no-edit
    git push azure master
    

Exercise 4: Scaling Using Azure Storage

Blobs are the simplest way to store large amounts of unstructured text or binary data such as video, audio and images. Moving the static content of your application to Storage helps scale your application by serving images or documents directly to the browser.

In this exercise, you will move the static content of your application to a Blob container. Then you will configure your application to add an ASP.NET URL rewrite rule in the Web.config to redirect your content to the Blob container.

Task 1 - Creating an Azure Storage Account

In this task you will learn how to create a new storage account using the management portal.

1. Navigate to the Azure Portal and sign in using the Microsoft account associated with your subscription.

2. Select New | Data + Storage | Storage account to start creating a new storage account.

   

   Creating a new storage account

3. In the Storage account blade, click Create.

   

   Creating the storage account

4. Enter a unique name for the account and select a Location from the list. Click Create to continue.

   

   Configuring the new storage account

5. Once the storage account is created it will open automatically. Click Properties in the Settings blade to see the information about the service endpoints that can be used within your applications.

   

   Storage Account created

6. Click the Manage Keys button in the navigation bar.

   

   Manage Access Keys button

7. Take note of the Storage Account Name and Primary Access Key in the Manage Keys dialog box, as you will need them in the following exercise. Then, close the dialog box.

   

   Manage Keys blade

Task 2 - Uploading an Asset to Azure Blob Storage

In this task, you will use the Server Explorer window from Visual Studio to connect to your storage account. You will then create a blob container and upload a file with the Geek Quiz logo to the container.

1. Switch to the Visual Studio instance with the GeekQuiz solution from the previous exercise.

2. From the menu bar, select View and then click Server Explorer.

3. In Server Explorer, right-click the Azure node and select Connect to Microsoft Azure Subscription.... Then, sign in using the Microsoft account associated with your subscription.

   

   Connect to Microsoft Azure

4. Expand the Azure node, right-click Storage and select Attach External Storage....

   

   Attaching an external storage

5. In the Add New Storage Account dialog box, enter the Account name and Account key you obtained in the previous task and click OK.

   

   Add New Storage Account dialog box

6. Your storage account should appear under the Storage node. Expand your storage account, right-click Blobs and select Create Blob Container....

   

   Create Blob Container

7. In the Create Blob Container dialog box, enter images as the name for the blob container and click OK.

   

   Create Blob Container dialog box

8. The new blob container should be added to the Blobs node. Change the access permissions in the container to make the container public. To do this, right-click the images container and select Properties.

   

   Images container properties

9. In the Properties window, set the Public Read Access to Container.

   

   Changing public read access property

10. When prompted if you are sure you want to change the public access property, click Yes.

    

    Microsoft Visual Studio warning

11. In Server Explorer, right-click the images blob container and select View Blob Container.

    

    View Blob Container

12. The images container should open in a new window and a legend with no entries should be shown. Click the Upload Blob icon to upload a file to the blob container.

    

    Images container with no entries

13. Upload the logo-big.png file located in the Assets folder of this lab. Leave the Folder (optional) field empty.

    

    Uploading the asset

14. When the upload completes, the file should be listed in the images container. Right-click the file entry and select Copy URL.

    

    Copy blob file URL

15. Open Microsoft Edge and paste the URL. The following image should be shown in the browser.

    

    logo-big.png image from Azure Blob Storage

Task 3 - Updating the Solution to Consume Static Content from Azure Blob Storage

In this task, you will configure the GeekQuiz solution to consume the image uploaded to Azure Blob Storage (instead of the image located in the web site) by adding an ASP.NET URL rewrite rule in the web.config file.

1. In Visual Studio, open the web.config file located in the wwwroot folder in the GeekQuiz project and locate the <system.webServer> element.

2. Add the following code to add a URL rewrite rule, updating the placeholder with your storage account name.

   (Code Snippet - WebSitesInProduction - Ex4 - UrlRewriteRule)

   <system.webServer>
   	<rewrite>
   		<rules>
   			<rule name="redirect-images" stopProcessing="true">
   				<match url="img/(.*)"/>
   				<action type="Redirect" url="http://[YOUR-STORAGE-ACCOUNT].blob.core.windows.net/images/{R:1}"></action>
   			</rule>
   		</rules>
   	</rewrite>

   Note: URL rewriting is the process of intercepting an incoming Web request and redirecting the request to a different resource. The URL rewriting rules tells the rewriting engine when and where a request needs to be redirected. A rewriting rule is composed of two strings: the pattern to look for in the requested URL (usually, using regular expressions), and the string to replace the pattern with, if found. For more information, see URL Rewriting in ASP.NET.

3. Press CTRL + S to save the changes.

4. Open the Index.cshtml file located at Views | Home and add the following header row inside the div element with the container class.

   <div class="row header">
       <img src="@Url.Content("~/img/logo-big.png")" alt="" />
   </div>

   

   Updated index view

5. Now you will deploy the updated application to Azure. Open a new Git Bash console and execute the following commands to push the changes into the repository and trigger a new deployment. Update the [YOUR-APPLICATION-PATH] placeholder with the path to the GeekQuiz solution.

   Note: When you deploy content to the FTP host or GIT repository of an Azure Web App you must authenticate using the deployment credentials associated with your subscription. If you do not know your deployment credentials you can easily reset them in the Azure Portal by opening the Web App Settings and clicking Deployment credentials.

   cd "[YOUR-APPLICATION-PATH]"
   git add .
   git commit -m "Added URL rewrite rule in web.config file"
   git push azure master
   

Task 4 - Verification

In this task you will use Microsoft Edge to browse the Geek Quiz application and check that the URL rewrite rule for images works and that you are redirected to the image hosted on Azure Blob Storage.

1. Open Microsoft Edge and navigate to your site (e.g. http://geek-quiz-site.azurewebsites.net/). Log in using the credentials you created previously.

   

   Showing the Geek Quiz website with the image

2. Press F12 to launch the development tools, select the Network tab and start recording.

   

   Starting network recording

3. Press CTRL + F5 to refresh the web page.

4. Once the page has finished loading, you should see an HTTP request for the /img/logo-big.png URL with an HTTP 301 result (redirect) and another request for http://[YOUR-STORAGE-ACCOUNT].blob.core.windows.net/images/logo-big.png URL with an HTTP 200 result.

   

   Verifying the URL redirect

Exercise 5: Using Autoscale for Web Sites

Note: This exercise is optional, since it requires support for Web Load & Performance Testing which is only available for Visual Studio 2015 Ultimate Edition. For more information on specific Visual Studio 2015 features, compare versions here.

Azure Web Apps provides the Autoscale feature for Web Apps running on a Standard plan. Autoscale lets Azure automatically scale the instance count of your Web App depending on the load. When Autoscale is enabled, Azure checks the CPU of your Web App once every five minutes and adds instances as needed at that point in time. If the CPU usage is low, Azure will remove instances once every two hours to ensure that the performance of your Web App is not degraded.

In this exercise you will go through the steps required to configure the Autoscale feature for the Geek Quiz Web App. You will verify this feature by running a Visual Studio load test to generate enough CPU load on the application to trigger an instance upgrade.

Task 1 - Configuring Autoscale Based on the CPU Metric

In this task you will use the Azure Portal to enable the Autoscale feature for the Web App you created in Exercise 2.

1. In the Azure Portal, select App Services and click the Web app you created in Exercise 2.

2. Navigate to the Scale Out (App Service Plan) option in the Settings blade. In the Scale setting blade, select the CPU Percentage option for the Scale by configuration.

   Note: When scaling by CPU, Azure dynamically adjusts the number of instances that the Web app uses if the CPU usage changes.

   

   Selecting to scale by CPU

3. Set the maximum number of Instances to 3 and the Target range to 5-25 percent. Then, click Save in the command bar at the top to save the changes.

   Note: This range represents the average CPU usage for your Web App. Azure will add or remove instances to keep the CPU within this range. The minimum and maximum number of instances used for scaling is specified in the Instance configuration. Azure will never go above or beyond that limit.

   The default Target range values are modified just for the purposes of this lab. By configuring the CPU range with these small values, you are increasing the chances to trigger Autoscale when a moderate load is placed on the application.

   

   Changing the Target range to be between 5 and 25 percent

Task 2 - Load Testing with Visual Studio

Now that Autoscale has been configured, you will create a Web Performance and Load Test Project in Visual Studio to generate some CPU load on your Web App.

1. Open Visual Studio Ultimate 2015 and select File | New | Project... to start a new solution.

   

   Creating a new project

2. In the New Project dialog box, select Web Performance and Load Test Project under the Visual C# | Test tab. Make sure .NET Framework 4.5 is selected, name the project WebAndLoadTestProject, choose a Location and click OK.

   

   Creating a new Web and Load Test project

3. Inside the WebTest1.webtest window, right-click the WebTest1 node and select Add Request.

   

   Adding a request to WebTest1

4. In the Properties window of the new request node, update the Url property to point to the URL of your Microsoft Azure Web App (e.g. http://geek-quiz.azurewebsites.net/).

   

   Changing the Url property

5. Back in the WebTest1.webtest window, right-click WebTest1 and select Add Loop....

   

   Adding a loop to WebTest1

6. In the Add Conditional Rule and Items to Loop dialog box, select the For Loop rule and modify the following properties.

   1. Terminating value: 1000
   2. Context Parameter Name: Iterator
   3. Increment Value: 1

   

   Selecting the For Loop rule and updating the properties

7. Under the Items in loop section, select the request you created previously as the first and last items for the loop. Click OK to continue.

   

   Selecting the first and last items for the loop

8. In Solution Explorer, right-click the WebAndLoadTestProject project, expand the Add menu and select Load Test....

   

   Adding a Load Test to the WebAndLoadTestProject project

9. In the New Load Test Wizard dialog box, click Next.

   

   New Load Test Wizard

10. In the Scenario page, select Do not use think times and click Next.

    

    Selecting not to use think times

11. In the Load Pattern page, make sure the Constant Load option is selected. Change the User Count setting to 250 users and click Next.

    

    Changing the user count to 250

12. In the Test Mix Model page, select Based on sequential test order and click Next.

    

    Selecting the test mix model

13. In the Test Mix Model page, click Add... to add a test to the mix.

    

    Adding a test to the test mix

14. In the Add Tests dialog box, double-click WebTest1 to add the test to the Selected tests list. Click OK to continue.

    

    Adding the WebTest1 test

15. Back in the Test Mix page, click Next.

    

    Completing the Test Mix page

16. In the Network Mix page, click Next.

    

    Clicking Next in the Network Mix page

17. In the Browser Mix page, select Internet Explorer 11.0 as the browser type and click Next.

    

    Selecting the browser type

18. In the Counter Sets page, click Next.

    

    Clicking Next in the Counter Sets page

19. In the Run Settings page, select Load test duration, make sure the Run duration is set to 5 minutes and then click Finish.

    

    Setting the load test duration to 5 minutes

20. In Solution Explorer, double-click the Local.settings file to explore the test settings. Make sure that Visual Studio uses your local computer to run the tests.

    Note: Alternatively, you can configure your test project to run the load tests in the cloud using Visual Studio Online (VSO). VSO provides a cloud-based load testing service that simulates a more realistic load, avoiding local environment constraints like CPU capacity, available memory and network bandwidth. For more information about using VSO to run load tests, see this article.

    

Task 3 - Autoscale Verification

You will now execute the load test you created in the previous task and see how your Web App behaves under load.

1. In Solution Explorer, double-click LoadTest1.loadtest to open the load test.

   

   Opening LoadTest1.loadtest

2. In the LoadTest1.loadtest windows, right-click the Run Settings1 node and select Properties or press ALT + Enter.

   

   Open Run Settings properties

3. Update the WebTest Connection Pool Size to 100 and save the changes.

   

   Run Settings properties

4. In the LoadTest1.loadtest window, click the first button in the toolbox to run the load test.

   

   Running the load test

5. Wait until the load test completes.

   Note: The load test simulates multiple users that send requests to the site simultaneously. When the test is running, you can monitor the available counters to detect any errors, warnings or other information related to your load test run.

   

   Load test running

6. Once the test completes, go back to the Azure Portal and navigate to the App Service Plan in which your web app was created. In the Scale tile under the Usage section, you should see that the number of instances has increased.

   

   New instance automatically deployed

   Note: It may take several minutes for the changes to appear in the graph (press CTRL + F5 periodically to refresh the page). If you do not see any changes, you can try the following:

   • Increase the duration of the load test (e.g. to 10 minutes)
   • Reduce the maximum and minimum values of the Target CPU range in the Autoscale configuration of your Web App
   • Run the load test in the cloud with Visual Studio Online. More information here

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Summary

In this hands-on lab, you have learned how to set up and deploy your application to a production Web App in Microsoft Azure. You started by detecting and updating your databases using Entity Framework Code First Migrations, then continued by deploying new versions of your site to different deployment slots using Git and performing rollbacks to the latest stable version of your site. Additionally, you learned how to scale your Web App using Storage to move your static content to a Blob container.

Note: You can take advantage of the Visual Studio Dev Essentials subscription in order to get everything you need to build and deploy your app on any platform.