Accessing Graph API with an Azure Function through Impersonation
Azure functions allow developers to focus on business logic. With the addition of the built in Authentication and Authorization feature a simple application can be developed that pulls specific information about a logged in user from graph API without having to write any code that requests access tokens on behalf of the user. Background The…
Application Initialization with Azure Functions
TL/DR You can warm up a function app using an applicationhost.config transform with an appliationhost.xdt. This ONLY works with Windows as application initialization is a concept built into IIS. I’m not aware of the same feature set available in Linux. Skip to the config section for the transformation setup. Background A couple months ago I…
Application Insights Integration with Function Apps in Azure Government or other Clouds
The use of the APPLICATIONINSIGHTS_CONNECTION_STRING in Azure Functions is now built into the runtime. Note my examples are for Azure US Government cloud but this can ultimately be used in any cloud with the correct endpoints specified. ********Update 4/28/2020********The Application Insights product team updated the certificate so you can now use the following connection string…
Azure Function Trigger Cheat Sheet
This is a quick reference covering general topics for the most common Azure Function triggers I deal with on a weekly basis. Knowing some of the high level terminology and architecture has helped me *maybe* sound somewhat knowledgeable in conversations with colleagues and customers. Its by no means a conclusive list or troubleshooting guide but…
ARM Template for Event Grid integration with a new Azure Function
TL/DR – Link to the template: https://github.com/jcbrooks92/EventGridAzureFunctionARMTemplate/tree/master Creating an ARM template with integration between an Azure function and Event Grid requires the general function template, Event Grid resource and lastly a system key from the Azure function that is used to authenticate the validation call from Event Grid. Update 2/12/2020There has been a recent update…
ARM Template for Event Grid integration with an Existing Azure Function
Recently the Azure Functions Team released a set of ARM APIs related to retrieving information about your function app such as the function keys, host key, functions deployed to the function app, and the system keys. The system keys are required to wire up Event Grid with your function app since Event Grid has to…
Load Root Certificate in an ILB ASE
Here’s the steps to upload a certificate to the Root Certificate store on the instance of an ILB ASE. This feature only works for ASEs. Brief overview: Go to an app that needs the cert to be available. Prepare your cert as a cer file (see steps below for more detail with screenshots) Go to…
Restoring Deleted Function Code
The three hosting models for Azure Functions are Consumption (serverless), Dedicated, and Premium (hybrid of dedicated and serverless). Depending on the type of function used dictates if and how the function app code can be restored. Restoring Deleted Code from Consumption and Premium Functions Consumption and Premium by default require users to have an app…
Accessing Azure Functions on ILB ASEs in the Azure Portal
There are two versions of ILB ASEs, one where a custom domain must be provided with a certificate and the newer version that is created with the .appserviceenvrionment.net domain (default configuration after May 2019 unless you specify an older version of the API). If you have an ASE that has the .appserviceenvironment.net domain you will…
Troubleshooting App Initialization (IIS Warmup) on Azure Web Apps
Troubleshooting App Init (IIS Warmup) Lately our team has been getting a higher load of issues related to customers trying to utilize the Application Initialization Module. This module is handy feature that allows you to warm your app prior to the application receiving requests to help avoid the dreaded cold-start or slow initial load times…
