Thank you very much, Jeff. One follow-up: Is the hashing algorithm consistent across multiple instances of HAproxy? If you and I set up identical configurations (in different locations), and the same IP connected to both, would they be routed in the same way?
-----Original Message----- From: Jeff Zellner [mailto:[email protected]] Sent: Tuesday, April 02, 2013 17:58 To: Jim Gronowski Cc: [email protected] Subject: Re: balance source and weighted records Hey Jim, Here's the pertinent section from the docs (http://cbonte.github.com/haproxy-dconv/configuration-1.4.html#4-balance ) "The source IP address is hashed and divided by the total weight of the running servers to designate which server will receive the request. This ensures that the same client IP address will always reach the same server as long as no server goes down or up. If the hash result changes due to the number of running servers changing, many clients will be directed to a different server." Cheers! -Jeff On Tue, Apr 2, 2013 at 4:04 PM, Jim Gronowski <[email protected]> wrote: > > Can someone provide some insight into what's happening when balancing > based on source? Is it consistent across different haproxy instances? > > For example, in a simple setup with one frontend balancing between two > backends, A and B - does balance source send 0.0.0.0-127.255.255.255 > to backend A and 128.0.0.0-255.255.255.255 to backend B? > > How does backend weight affect the distribution - does it just move > the proportion up or down? > > Thanks, > > Jim > > > > > > Ditronics, LLC email disclaimer: > > This communication, including attachments, is intended only for the exclusive use of addressee and may contain proprietary, confidential, or privileged information. Any use, review, duplication, disclosure, dissemination, or distribution is strictly prohibited. If you were not the intended recipient, you have received this communication in error. Please notify sender immediately by return e-mail, delete this communication, and destroy any copies. > >
