Load Balancing for Proxy Servers

• Performance

  Distributes traffic evenly across multiple proxy servers so no single server is overwhelmed and every server operates efficiently.

• Reliability

  Failover capabilities ensure proxies remain available even if one or more servers fail — there is always a proxy ready to serve the request.

• Scalability

  As demand grows, load balancers distribute the increased traffic across more servers, allowing seamless scale without sacrificing performance.

• Hardware Load Balancers

  Dedicated physical appliances

  Hardware load balancers are physical devices specifically designed for load balancing tasks. They offer high performance, reliability, and advanced features, making them suitable for environments with exceptionally high traffic volumes and strict performance requirements. Key benefits include optimized traffic distribution, enhanced security features, and robust failover mechanisms.

  They are deployed as dedicated devices within a network infrastructure — typically installed between the internet and the internal server farm, acting as a gateway that manages incoming traffic. These devices often come with redundant components to ensure high availability and reliability, and use specialized hardware components and optimized network interfaces to process and distribute traffic efficiently.

  Hardware load balancers generally involve higher initial costs compared to software and cloud load balancers due to the expense of the physical devices and the need for specialized hardware. They also require ongoing maintenance, which can add to the overall cost.

  When it fits

  Relevant for large enterprises with significant traffic demands — a major financial institution or a high-traffic e-commerce platform, where the high performance, reliability, and advanced security features they provide are worth the investment.

• Software Load Balancers

  Apps running on commodity servers

  Software load balancers are applications that run on standard servers or virtual machines. They offer flexibility, ease of deployment, and cost-effectiveness. Key benefits include the ability to customize configurations, scalability, and integration with existing infrastructure.

  They can be deployed on any standard server or virtual machine, making them highly versatile. Installed as software, they can run in various environments — on-premises data centers and cloud platforms alike. Their deployment can be easily scaled by adding more instances as needed.

  Software load balancers are typically more cost-effective than hardware load balancers because they do not require dedicated physical devices. They leverage existing hardware, reducing the initial investment. However, they can still involve licensing costs and may require significant server resources.

  When it fits

  Relevant for small to medium-sized businesses or startups with moderate amounts of traffic. A growing e-commerce business might use one to manage traffic distribution across its web servers — benefiting from flexibility and lower cost while still ensuring reliable performance.

• Globe2 Load Balancers

  Managed services from cloud providers

  Globe2 load balancers are managed services provided by cloud providers. They offer scalability, ease of management, and integration with other cloud services. Key benefits include automatic scaling, high availability, and reduced management overhead.

  They are deployed as part of a cloud provider’s infrastructure. Users configure and manage the load balancer through the provider’s management console or API. The cloud provider handles the underlying infrastructure, including maintenance and scaling — automatically adjusting to changes in traffic load by scaling up or down. These services typically offer a range of load balancing algorithms and advanced features like SSL termination and DDoS protection.

  Globe2 load balancers generally operate on a pay-as-you-go pricing model, which can be more cost-effective than hardware solutions for many organizations. They eliminate the need for upfront hardware investment and reduce ongoing maintenance costs. However, the total cost can vary based on usage and the specific features required.

  When it fits

  Relevant for organizations that have cloud infrastructure or need to scale quickly. A global streaming service using AWS or Google Globe2 could deploy a cloud load balancer to manage traffic across multiple regions, ensuring low latency and high availability for users worldwide.

• Round Robin

  A simple and commonly used algorithm that distributes incoming requests sequentially across a pool of servers. When a request is received, it is sent to the next server in line, so each server receives an equal number of requests over time.

  Easy to implement and works well in environments where servers have similar capabilities and load handling capacities. Less optimal where server performance varies significantly, as it does not consider the current load or capacity of each server.

• Least Connections

  Directs traffic to the server with the fewest active connections at the time of the request. This approach helps balance the load more dynamically by considering the current workload on each server.

  Suitable for environments where traffic patterns are unpredictable or where servers have varying capacities. By continuously monitoring the number of active connections, Least Connections can effectively distribute traffic to prevent any single server from becoming overloaded.

• Weighted Round Robin

  Builds on the basic Round Robin algorithm by assigning a weight to each server based on its capacity or performance. Servers with higher weights get proportionally more requests.

  Allows for more fine-tuned control over traffic distribution, ensuring that more powerful servers handle a larger share of the load. Particularly useful in cases where servers have different capabilities.

• IP Hash

  Uses the client’s IP address to decide which server will handle the request. A hash function is applied to the client’s IP address to generate a hash value, which is then used to map the request to a specific server.

  Ensures that the same client consistently connects to the same server, providing session persistence and maintaining a continuous user experience. Beneficial for applications where the server keeps information about a user’s previous activity (e.g. e-commerce shopping carts or webmail services).

• Enhanced Performance
• Increased Reliability
• Cost Efficiency
• Scalability
• Efficient Use of Resources
• Improved Security
• Consistent User Experience

Load balancing offers a variety of benefits that ensure no single server is overwhelmed and ensures your proxies are there when they’re needed. With efficient load balancing in place, new servers can be added and accounted for conveniently and maximizes the utilization of each one.

Load balancers and reverse proxies overlap heavily; both can distribute incoming traffic across different servers to optimize resource utilization. Where they differ is largely in primary function — one is built around distribution, the other around shielding the origin.