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HAProxy vs ProxySQL: 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 ProxySQL? A High-performance, GPL licensed MySQL proxy. It has an advanced multi-core architecture. It's built from the ground up to support hundreds of thousands of concurrent connections, multiplexed to potentially hundreds of backend servers. It helps you squeeze the last drop of performance out of your MySQL cluster, without controlling the applications that generate the queries.

HAProxy belongs to "Load Balancer / Reverse Proxy" category of the tech stack, while ProxySQL can be primarily classified under "Database Tools".

Instagram, Dropbox, and Medium are some of the popular companies that use HAProxy, whereas ProxySQL is used by 000webhost, Singular Group, and Bamboo Group. HAProxy has a broader approval, being mentioned in 602 company stacks & 1060 developers stacks; compared to ProxySQL, which is listed in 5 company stacks and 3 developer stacks.

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What is HAProxy?

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 ProxySQL?

It has an advanced multi-core architecture. It's built from the ground up to support hundreds of thousands of concurrent connections, multiplexed to potentially hundreds of backend servers. It helps you squeeze the last drop of performance out of your MySQL cluster, without controlling the applications that generate the queries.
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      What are some alternatives to HAProxy and ProxySQL?
      nginx
      nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. According to Netcraft nginx served or proxied 30.46% of the top million busiest sites in Jan 2018.
      Traefik
      A modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components and configures itself automatically and dynamically.
      Envoy
      Originally built at Lyft, Envoy is a high performance C++ distributed proxy designed for single services and applications, as well as a communication bus and “universal data plane” designed for large microservice “service mesh” architectures.
      Squid
      Squid reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.
      Varnish
      Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 - 1000x, depending on your architecture.
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      Decisions about HAProxy and ProxySQL
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      How developers use HAProxy and ProxySQL
      Avatar of Trello
      Trello uses HAProxyHAProxy

      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.

      Avatar of The Independent
      The Independent uses HAProxyHAProxy

      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.

      Avatar of Packet
      Packet uses HAProxyHAProxy

      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.

      Avatar of ssshake
      ssshake uses HAProxyHAProxy

      I use HAproxy primarily for application routing and SSL termination. I also use its logs and statistics to visualize incoming traffic in Kibana.

      Avatar of Clarabridge Engage
      Clarabridge Engage uses HAProxyHAProxy

      We use HAProxy to load balance web requests for our web application, but also for some internal load balancing of microservices.

      How much does HAProxy cost?
      How much does ProxySQL cost?
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