The Azure application gateway is another form of load balancing in Azure. Application load balancing enables Azure Customers to create routing rules for network traffic based on HTTP protocols like for publishing Websites on the same IP Address.
Application gateways currently support layer-7 application delivery for the following application-based load balancing algorithms:
- HTTP load balancing
- Cookie-based session affinity
- Secure Sockets Layer (SSL) offload
- URL-based content routing
- Multi-site routing
Application gateways currently offer the sizes small, medium, and large.
You can create up to 50 application gateways per subscription. Each application gateway can have up to 10 instances each, which makes up to 500 instances depending on the gateway site.
Please note that the small size is only for testing purpose and shouldn't be used in production.
Every gateway has a limited throughput performance. The following table shows the performance per gateway:
|
Back-end page response |
Small |
Medium |
Large |
|
6 K |
7.5 Mbps |
13 Mbps |
50 Mbps |
|
100 K |
35 Mbps |
100 Mbps |
200 Mbps |
The Azure application gateway is represented in the Azure portal with the symbol shown in the following screenshot:
We will not cover Azure application gateways further in this book, but to get more information, you can access the Azure application gateway documentation at https://azure.microsoft.com/en-us/documentation/articles/application-gateway-introduction/.