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As per the (verbose) topic, are there any advantages over using a Keepalived & HAProxy as an HA webserver loadbalancer vs a pure keepalived solution?
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HAProxy (High Availability Proxy) is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. On the other hand, Keepalived is detailed as "A routing software written in C".
The most basic Keepalived configuration enables a shared IP address between two servers. In the above topology, server1 is the master, and server2 is the backup. The configuration for both servers is simple.
HAProxy is a high-performance, open-source load balancer and reverse proxy for TCP and HTTP applications. Users can make use of HAProxy to improve the performance of websites and applications by distributing their workloads. Performance improvements include minimized response times and increased throughput.
Keepalived is working in layer 4 so doesn't have layer 7 knowledge at all. By using HAProxy and Keepalived together you can get benefit of having some options that HAProxy provides in layer 7 like Stickiness, Sampling and converting information, ACLs and conditions, Content switching, Stick-tables, Formated strings, HTTP rewriting and redirection, Server protection, etc.
If you only need to have a load balancer without any manipulating or any high level decision (layer 7) you can use only Keepalived and it will be faster because it works in layer 4.
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