HAProxy vs Vulcand: What are the differences?
What is HAProxy? The Reliable, High Performance TCP/HTTP Load Balancer. 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.
What is Vulcand? Programmatic load balancer backed by Etcd. Vulcand is a programmatic extendable proxy for microservices and API management. It is inspired by Hystrix and powers Mailgun microservices infrastructure.
HAProxy and Vulcand can be primarily classified as "Load Balancer / Reverse Proxy" tools.
Vulcand is an open source tool with 2.8K GitHub stars and 214 GitHub forks. Here's a link to Vulcand's open source repository on GitHub.
What is HAProxy?
What is Vulcand?
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We use HAProxy to load balance between our webservers. It balances TCP between the machines round robin and leaves everything else to Node.js, leaving the connections open with a reasonably long time to live to support WebSockets and re-use of a TCP connection for AJAX polling.
HAProxy manages internal and origin load balancing using KeepaliveD. Two small servers host the entire site, never moving about 15% load even during the largest load spikes.
We use HAProxy to balance traffic at various points in our stack, includgin nginx nodes on different physical machines, and api nodes on the backend.
I use HAproxy primarily for application routing and SSL termination. I also use its logs and statistics to visualize incoming traffic in Kibana.