Learn Complete Azure load Balancing Services - Front Door Traffic Manager Application Gateway

Learn Complete Microsoft Azure Load Balancing Services
There are two types of Load Balancing services we can think of Global and Regional services

Global Services
1) Azure Front Door
2) Azure Traffic Manager (Non-Http/s)

Regional Services
3) Azure Application Gateway
4) Azure Load Balancer (Non-Http/s)

Types of Azure load balancing services

Front Door is an application delivery network that provides global load balancing and site acceleration service for web applications. It offers Layer 7 capabilities for your application like SSL offload, path-based routing, fast failover, caching, etc. to improve the performance and high-availability of your applications.

Traffic Manager is a DNS-based traffic load balancer that enables you to distribute traffic optimally to services across global Azure regions while providing high availability and responsiveness. Because Traffic Manager is a DNS-based load-balancing service, it load balances only at the domain level. For that reason, it can't failover as quickly as Front Door, because of common challenges around DNS caching and systems not honoring DNS TTLs.

Application Gateway provides an application delivery controller (ADC) as a service, offering various Layer 7 load-balancing capabilities. Use it to optimize web farm productivity by offloading CPU-intensive SSL termination to the gateway.

Azure Load Balancer is a high-performance, ultra-low-latency Layer 4 load-balancing service (inbound and outbound) for all UDP and TCP protocols. It is built to handle millions of requests per second while ensuring your solution is highly available. Azure Load Balancer is zone-redundant, ensuring high availability across Availability Zones.

Decision tree for load balancing in Azure

When selecting the load-balancing options, here are some factors to consider:

Traffic type. Is it a web (HTTP/HTTPS) application? Is it public facing or a private application?

Global versus. regional. Do you need to load balance VMs or containers within a virtual network, or load balance scale unit/deployments across regions, or both?
Availability. What is the service SLA?

Cost. See Azure pricing. In addition to the cost of the service itself, consider the cost of the operations for managing a solution built on that service.

Features and limits. What are the overall limitations of each service? See Service limits.


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