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What is the difference between Azure VNET integration and VNET injection?

The two terms VNET integration and VNET injection seem to be used often for the same thing. However for some services like Azure Web Apps the VNET integration just allows outbound traffic from the service to the VNET. And for other services like PostgreSQL Flex Server both terms seem to be used for inbound access from VNET to Postgres as described here: https://learn.microsoft.com/en-us/azure/postgresql/flexible-server/concepts-networking-private

What are the general differences between both? Or do both terms have different meanings for each service?

Solution

  • What is the difference between Azure VNET integration and VNET injection?

    Here is the detailed explanation about VNET injection and VNET integration.

    VNET Integration: It is mainly used to connect an Azure Pass service to a virtual network to enable communication between the Paas service and resources within the VNET.

    You can also use network security groups or route tables on this subnet to control all outbound traffic from your applications.

    It mainly used for Outbound traffic from the Azure PaaS applications, Follow the link by KapilAnanth-MSFT

    Example: When you enable VNET Integration for an Azure Web App, the web app can send traffic to Azure resources inside a VNET, but it doesn't directly receive traffic from the VNET. It's primarily for outbound connections.

    VNET Injection: VNET injection is a more specific term that often implies deploying an Azure service directly into a VNET subnet, making it part of the VNET's private IP address space.

    The virtual network injection allows an Azure resource to inject containerized workloads into an Azure virtual network so that resources in Azure can be accessed via a private IP address on the virtual network. After you've configured virtual network injection for a resource in a virtual network and enabled the resource as a target, follow the Virtual network injection for more details.

    Example : The Azure VNET injection allows the Azure database server to be deployed into a VNET subnet, enabling private access from other resources within the VNET.