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Dominic Burford - Professional Profile



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I am a professional software engineer and technical architect with over twenty years commercial development experience with a strong focus on the design and development of web and mobile applications.

I have experience of architecting scalable, distributed, high volume web applications that are accessible from multiple devices due to their responsive web design, including architecting enterprise service-oriented solutions. I have also developed enterprise mobile applications using Xamarin and Telerik Platform.

I have extensive experience using .NET, ASP.NET, Windows and Web Services, WCF, SQL Server, LINQ and other Microsoft technologies. I am also familiar with HTML, Bootstrap, Javascript (inc. JQuery and Node.js), CSS, XML, JSON, Apache Cordova, KendoUI and many other web and mobile related technologies.

I am enthusiastic about Continuous Integration, Continuous Delivery and Application Life-cycle Management having configured such environments using CruiseControl.NET, TeamCity and Team Foundation Services. I enjoy working in Agile and Test Driven Development (TDD) environments.

Outside of work I have two beautiful daughters. I am also an avid cyclist who enjoys reading, listening to music and travelling.

 

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GeneralManaging your Azure resources using Powershell scripting Pin
Dominic Burford13-Mar-20 6:42
professionalDominic Burford13-Mar-20 6:42 
I recently had a need to start / stop our Azure web application from our deployment pipeline. As part of our deployment process I have written a script that uploads the latest changes to our Azure web hosting via FTP (using the excellent WinSCP). In testing this however I was finding that sometimes not all the files were getting uploaded, in particular the application's main assembly would often fail to upload as it was in use. I therfore decided that I would stop / start the web application as part of the deployment.

- stop the web application
- upload the latest changes via FTP
- start the web application

After some research I discovered the following Powershell (PS) cmdlets that I would require.

Start-AzWebApp
Stop-AzWebApp
Restart-AzWebApp (not needed for this particular requirement but might be useful elsewhere in the deployment pipeline).

So I began implementing a PS script that would invoke the aforementioned cmdlets to stop / start our web application. However, the script kept failing with the following error message.
Quote:
No subscription found in the context. Please ensure that the credentials you provided are authorized to access the Azure subscription then run Connect-AzAccount to login.
Okay, so I need to programatically login to our Azure account before I can invoke the methods. This seemed reasonable, as I wouldn't want just anyone interacting with our Azure resources. So I began investigating how to login to Azure using the Connect-AzAccount cmdlet. This is where I got a bit stuck. The parameters I needed to pass to the cmdlet I didn't have and couldn't find them anywhere. I looked all through the Azure dashboard and in particular the settings relating to the web application.

After some further investigation it seemed that the correct approach (at least as far as my particular requirements were concerned) was to create an Azure Service Principal and to use this to interact with the Azure resources from the PS script. You give the Azure Service Principal only the minimum level of privilege to accomplish the task(s) you require. In this case, I needed the Azure Service Principal to have the ability to stop / start a web application. The privileges you can assign are extremely granular and you can choose the exact level of privilege you need to accomplish your task(s).

In order to create the Azure Service Principal I followed the instructions in this guide[^].

This was simple and I had the Azure Service Principal created in no time. As part of the configuration of the App Registration step, you will also need to create a new Client Secret (Home -> {Azure Active Directory} -> App Registrations -> Certificates & secrets). I called the App Registration "PowershellAutomation" and named the Client Secret "PowershellAutomationSecret". All very self explanatory should someone else have to maintain this later on. Be sure to make a note of the value for your generated Client Secret as you will need to use it in your PS script for logging into your Azure account.

Then all you need to do is plug all the values into your PS script and you're done. You can now manage your Azure resources directly from your PS scripts.

Here's my PS script for stopping the Azure web application.
cls

$ResourceGroupName = "MyWebAppGroup"
$Name = "MyWebApp"

"Stopping web application " + $Name

"ResourceGroupName: " + $ResourceGroupName
"Name: " + $Name

$SubscriptionId = "xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx"
"SubscriptionId is: " + $SubscriptionId

# from the Azure AD app registration 
$clientSecret = "xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx"
$azureAplicationId = "xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx"
$azureTenantId= "xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx"
$azurePassword = ConvertTo-SecureString $clientSecret -AsPlainText -Force
$psCred = New-Object System.Management.Automation.PSCredential($azureAplicationId , $azurePassword)

# login to Azure and set the current context
Connect-AzAccount -Credential $psCred -TenantId $azureTenantId -ServicePrincipal 
Set-AzContext -Subscription $SubscriptionId

Stop-AzWebApp -ResourceGroupName $ResourceGroupName -Name $Name

"Finished"
I am now able to stop / start the web application from our deployment pipeline using Powershell. This means I am still able to automate the entire deployment pipeline without it needing any manual input from me. So once we are in a position to deploy the web application to our STAGING or PRODUCTION environments, we can accomplish this entirely from our TFS deployment pipeline.

Now that I have managed to programatically login to our Azure account to accomplish these tasks, I am able to use the same process to carry out any number of other tasks where I want to automate the interaction of our Azure resources from a Powershell script. This gives me a whole new playing field of ideas where our build and deployment pipelines are concerned, or indeed where any of our Azure resources are concerned and could benefit from PS automation.
"There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult." - C.A.R. Hoare

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modified 16-Mar-20 4:12am.

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GeneralRe: Writing flexible filters for your data using Predicates Pin
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professionalSlacker00716-Jul-19 22:09 
GeneralRe: Writing flexible filters for your data using Predicates Pin
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GeneralImproving Your SQL Stored Procedures Pin
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GeneralPassing a list of items to a SQL stored procedure Pin
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GeneralSending Push Notifications with Azure Notification Hub Pin
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