Environment variables and configuration in Azure - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are environment variables in cloud applications?

Environment variables are key-value pairs stored outside the application code. They provide configuration settings like database URLs or API keys, allowing apps to change behavior without changing code.

beginner

Why use environment variables instead of hardcoding settings?

Using environment variables keeps sensitive data like passwords safe and lets you change settings easily across different environments (development, testing, production) without changing the app code.

intermediate

How do Azure App Services manage environment variables?

Azure App Services let you set environment variables in the Application Settings section. These variables are injected into your app at runtime and override any default settings.

intermediate

What is the benefit of using Azure Key Vault with environment variables?

Azure Key Vault securely stores secrets like passwords or certificates. Your app can fetch these secrets at runtime, keeping sensitive info out of environment variables and code.

intermediate

How can you update environment variables without redeploying your Azure app?

You can update environment variables directly in Azure Portal under Application Settings. The app will use the new values on next restart or automatically if supported, avoiding full redeployment.

Where do environment variables typically store sensitive information in Azure apps?

A In user input forms

B In the application code files

C In Azure Application Settings

D In the app's UI

Environment variables are set in Azure Application Settings to keep sensitive info out of code.

What is a key advantage of using Azure Key Vault over environment variables for secrets?

A It stores secrets securely and separately from app settings

B It makes the app run faster

C It automatically writes code for you

D It replaces environment variables completely

Azure Key Vault securely stores secrets, reducing risk compared to environment variables.

How can you change an environment variable in Azure App Service without redeploying the app?

A Change the variable in Application Settings in Azure Portal

B Edit the code and redeploy

C Restart the computer

D Change the variable in the app's UI

Changing variables in Application Settings updates them without redeployment.

Why should sensitive data not be hardcoded in cloud apps?

A It makes the app slower

B It uses more memory

C It is required by law

D It risks exposing secrets and makes updates harder

Hardcoding secrets risks exposure and complicates updates.

What happens if an environment variable is set both in code and Azure Application Settings?

A The code value is used

B The Azure Application Settings value overrides the code

C The app crashes

D Both values are combined

Azure Application Settings override code values at runtime.

Explain how environment variables help manage configuration in Azure cloud apps.

Think about how apps can use settings that change by environment.

Describe the role of Azure Key Vault in securing application configuration.

Consider how to keep passwords and keys safe in the cloud.