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Sticky sessions for nginx
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michaelneale/nginx-sticky-module
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FROM http://code.google.com/p/nginx-sticky-module/source/browse/tags/1_0 Nginx Sticky Module -- Description: A nginx module to add a sticky cookie to be always forwarded the the same upstream server. When dealing with several backend servers, it's sometimes useful that one client (browser) is always served by the same backend server (for session persistance for example). Using a persistance by IP (with the ip_hash upstream module) is maybe not a good idea because there could be situations where a lot of different browsers are coming with the same IP address (behind proxies)and the load balancing system won't be fair. Using a cookie to track the upstream server makes each browser unique. When the sticky module can't apply, it switchs back to the classic Round Robin Upstream or returns a "Bad Gateway" (depending on the no_fallback flag). Sticky module can't apply when cookies are not supported by the browser * Sticky module is based on a "best effort" algorithm. Its aim is not to handle * security somehow. It's been made to ensure that normal users are always * redirected to the same backend server: that's all! Installation You'll need to re-compile Nginx from source to include this module. Modify your compile of Nginx by adding the following directive (modified to suit your path of course): ./configure ... --add-module=/absolute/path/to/nginx-sticky-module make make install Usage upstream { sticky; server 127.0.0.1:9000; server 127.0.0.1:9001; server 127.0.0.1:9002; } sticky [name=route] [domain=.foo.bar] [path=/] [expires=1h] [hash=index|md5|sha1] [no_fallback]; - name: the name of the cookies used to track the persistant upstream srv default: route - domain: the domain in which the cookie will be valid default: nothing. Let the browser handle this. - path: the path in which the cookie will be valid default: nothing. Let the browser handle this. - expires: the validity duration of the cookie default: nothing. It's a session cookie. restriction: must be a duration greater than one second - hash: the hash mechanism to encode upstream server. It cant' be used with hmac. md5|sha1: well known hash index: it's not hashed, an in-memory index is used instead it's quicker and the overhead is shorter Warning: the matching against upstream servers list is inconsistent. So, at reload, if upstreams servers has changed, index values are not guaranted to correspond to the same server as before! USE IT WITH CAUTION and only if you need to! default: md5 - hmac: the HMAC hash mechanism to encode upstream server It's like the hash mechanism but it uses hmac_key to secure the hashing. It can't be used with hash. md5|sha1: well known hash default: none. see hash. -hmac_key: the key to use with hmac. It's mandatory when hmac is set default: nothing. -no_fallback: when this flag is set, nginx will return a 502 (Bad Gateway or Proxy Error) if a request comes with a cookie and the corresponding backend is unavailable. Detail Mechanism see docs/sticky.{vsd,pdf} Contributing http://code.google.com/p/nginx-sticky-module/ TODO Stress Code review Author Jerome Loyet <jerome at loyet dot net> Copyright & License This module is licenced under the BSD license. Copyright (C) 2010 Jerome Loyet (jerome at loyet dot net) Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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