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Showing of 26What is load balancing and why is it necessary?
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Load balancing is the process of distributing incoming network traffic or computational workload across multiple servers or resources to ensure no single server becomes overwhelmed. It's necessary for several reasons:
- Improved availability: If one server fails, others can continue serving requests
- Better performance: Distributes load to prevent server overload and reduce response times
- Scalability: Allows adding more servers to handle increased traffic
- Resource utilization: Ensures efficient use of all available servers
Think of it like having multiple checkout counters in a store instead of just one - customers get served faster and if one counter breaks down, others are still available.
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What are the main types of load balancers based on the OSI layer they operate on?
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There are two main types:
Layer 4 (Transport Layer) Load Balancers:
- Operate at the TCP/UDP level
- Make routing decisions based on IP address and port numbers
- Faster and more efficient
- Cannot inspect application data
- Example: AWS Network Load Balancer
Layer 7 (Application Layer) Load Balancers: - Operate at the HTTP/HTTPS level
- Can make routing decisions based on content (headers, URLs, cookies)
- More intelligent routing capabilities
- Can perform SSL termination
- Example: AWS Application Load Balancer
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Explain the difference between hardware and software load balancers.
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- Dedicated physical appliances (F5, Citrix NetScaler)
- High performance and reliability
- Expensive and less flexible
- Vendor lock-in
- Difficult to scale quickly
Software Load Balancers:
- Run on standard servers or virtual machines
- More cost-effective and flexible
- Easier to configure and update
- Can be cloud-native
- Examples: HAProxy, NGINX, Traefik
Most modern applications prefer software load balancers due to their flexibility and integration with cloud environments.
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What is the Round Robin load balancing algorithm?
What are health checks in load balancing?
Explain the Least Connections load balancing algorithm.
What is session persistence (sticky sessions) and when should you use it?
What is SSL termination and what are its benefits?
Explain the Weighted Round Robin algorithm.
What is the difference between a reverse proxy and a load balancer?
What are the different load balancing algorithms and their use cases?
How do you handle failover scenarios in load balancing?
How do you implement global load balancing and what are the challenges?
Explain load balancing strategies for microservices architectures.
How do you troubleshoot load balancer performance issues?
What are the security considerations for load balancers?
How do you implement auto-scaling with load balancers?
How do you design load balancing for high availability across multiple data centers?
What are the performance optimization techniques for load balancers?
How do you implement health checks for complex applications with dependencies?
What are the challenges and solutions for load balancing WebSocket connections?
How do you implement blue-green deployments with load balancers?
What are the key metrics and monitoring strategies for load balancers?
How do you handle load balancing for applications with varying resource requirements?
How do you implement disaster recovery strategies for load-balanced systems?
How do you perform rolling updates with zero downtime?
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Load Balancing, in short videos.
Load Balancing cheatsheet
- Types of Load Balancers01
- Load Balancing Algorithms02
- Load Balancer Placement03
- Health Checks04
- Session Persistence (Sticky Sessions)05
- Advanced Concepts06
- Performance Metrics07
- Critical Interview Topics08
- Design Considerations09
- Best Practices10
- Quick Implementation Examples11
- Interview Strategy12
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