Snipplr - alexwilliams

(Apache) HAProxy URL Rewriting with query strings (ugly URLs)

Mon, 17 Aug 2009 15:08:34 GMT

This line can be added to 'backend', 'frontend', 'listen' directives in the HAProxy config. It will redirect all requests for /books/mysql to /books.php?title=mysql

(Apache) HAProxy URL Rewriting

Thu, 13 Aug 2009 14:10:49 GMT

In this example: *rewrite urls from domain.com to www.domain.com* This is somewhat documented elsewhere, but not very well, so here's an example on how to perform simple URL rewriting with HAProxy (instead of using mod_rewrite with apache). This works great if your servers use lighttpd, nginx, or anything that doesnt provide its own simple url rewriting.

(Apache) HAProxy database load-balancing and redundancy

Fri, 07 Aug 2009 13:55:46 GMT

_This hasn't been tested in production yet. Use at your own risk_ The read cluster contains 7 servers which can accept *READ* requests, but not all at once (see Failure Scenarios). The write cluster contains 4 servers which can accept *WRITE* requests (only 1 at a time though, *don't be stupid*). Port 9201 is an HTTP service which checks if replication is running fine (SlaveIO yes, SlaveSQL yes, SecondsBehindMaster 0). Port 9200 is an HTTP service which checks if mysql is running fine (results appear after performing 'show databases'). In both cases (ports 9200 and 9201), a simple shell script is installed on each server which then runs as a STREAM daemon through xinetd) and outputs a "200 OK" or "503 Service Unavailable".

(Other) Haproxy load-balanced web cluster with different backends through acl's

Mon, 27 Jul 2009 11:08:44 GMT

How to send load-balanced requests to a web cluster and split the requests to different server pools based on specific ACL rules. This configuration sends files ending with .php to a pool of "dynamic" web servers (running Apache). It sends all other files (.js, .jpg, .css, .html) to a pool of "static" web servers (running Lighttpd).

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