Load balancing is process of balancing incoming requests to multiple machines, processes or services. In this video we will explain two types of load balancers, layer 4 and layer 7.
Layer 4 - haproxy, NLB
Pros
- great for simple packet-level load balancing
Fast and efficient doesn’t look at the data
More secure as it cant really look at your packets. So if it was compromised no one can look
- Uses NAT - One connection between client and server NATed
Cons
- Can't do smart load balancing based on the content, such as switch request based on the requested media type
- Cant do microservices with this type
- Has to be sticky as it is a stateful protocol (all segments)
Layer 7 (Nginx , haproxy)
This type of proxy actually looks at the content and have more context, it knows you are visiting the /users resources so it may forward it to a different server. Essential and Great for microservices , it knows the content is video:image etc..
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