Menu

Load Balancer as a Service

Overview

A load balancer is a hardware or software device that distributes incoming network and application traffic across multiple servers to ensure no single server is overwhelmed. By acting as a reverse proxy, it improves application reliability, availability, and performance. Load balancers are used in distributed systems to handle fluctuating traffic by scaling capacity up or down and can route requests based on various algorithms and health checks

Package
FAQS

How much does a load balancer cost?
The cost of a load balancer varies widely based on the vendor, type (hardware vs. software), and capacity.

  • Cloud-based load balancers (e.g., AWS, Azure, Google Cloud, Oracle): Often follow a consumption-based pricing model. Costs can be based on the number of load balancer hours and the amount of data processed (per hour, per megabit per second, or other metrics). Cloud providers offer different tiers with varying performance and cost.
  • Hardware load balancers (e.g., F5, Citrix, A10): Are physical appliances with a high upfront cost, with some models costing hundreds of thousands of rupees.
  • Software load balancers: Can be purchased with perpetual or subscription licenses.

How is a load balancer different from a reverse proxy?
A load balancer and a reverse proxy are very similar and can even be combined in one device, but they have distinct primary functions. 

  • Reverse proxy: Sits in front of one or more web servers. It directs incoming client requests to the appropriate backend server and can also provide services like caching, SSL termination, and enhanced security. A reverse proxy is also useful for a single-server setup to provide security and performance benefits.
  • Load balancer: Specifically distributes incoming traffic across a group of backend servers to prevent a single server from being overwhelmed. It improves scalability and availability in multi-server environments. A Layer 7 load balancer is a reverse proxy, as it handles web requests based on application-level information. 

How is a load balancer different from a firewall?
Load balancers and firewalls have different roles in securing and managing network traffic, but they can work together. 

  • Load balancer: Primarily focuses on distributing traffic to prevent server overload and ensure high availability. While it can help mitigate the impact of certain attacks like a DDoS, its main function is not security.
  • Firewall: Enforces access control policies and filters malicious traffic to protect a network. A Web Application Firewall (WAF), a specialized type of firewall, inspects and filters HTTP traffic for specific threats like SQL injection and cross-site scripting (XSS).
  • Combined approach: A load balancer can be placed behind a firewall or in a cluster of firewalls to balance the traffic sent to the security devices, creating a more scalable and resilient security infrastructure.