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1.2.5 - 2014-07-07 | ||
- setting path-defaults to / | ||
fixing issue | ||
https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/issue/7/leaving-cookie-path-empty-in-module | ||
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1.2.4 - 2014-04-18 | ||
- fixed an compiling-issue on some systems (SLES, CentOS) | ||
https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/issue/5/nginx-compile-warning | ||
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1.2.3 - 2014-03-10 | ||
- sticky-module might work now with upstream-check-module | ||
https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/issue/3/patch-to-allow | ||
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1.2.2 - 2014-03-04 | ||
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- use "Expires" instead of "Max-Age" directive to set cookie expiration | ||
https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/issue/2/nginx-sticky-module-uses-max-age-directive | ||
- fix a bug due to a change in nginx-api (>= 1.5.8) | ||
https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/issue/1/nginx-158-api-change-for-ngx_sock_ntop | ||
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1.2.1 - 2014-02-20 | ||
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- cloned from: https://code.google.com/p/nginx-sticky-module/ | ||
- route-cookie might be configured to be httponly/secure | ||
patch included: https://code.google.com/p/nginx-sticky-module/issues/detail?id=24 |
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# Nginx Sticky Module | ||
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modified and extended version; see Changelog.txt | ||
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# Description | ||
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A nginx module to add a sticky cookie to be always forwarded to the same | ||
upstream server. | ||
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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). | ||
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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. | ||
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Using a cookie to track the upstream server makes each browser unique. | ||
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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). | ||
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Sticky module can't apply when cookies are not supported by the browser | ||
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> 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 | ||
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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): | ||
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./configure ... --add-module=/absolute/path/to/nginx-sticky-module-ng | ||
make | ||
make install | ||
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# Usage | ||
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upstream { | ||
sticky; | ||
server 127.0.0.1:9000; | ||
server 127.0.0.1:9001; | ||
server 127.0.0.1:9002; | ||
} | ||
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sticky [name=route] [domain=.foo.bar] [path=/] [expires=1h] | ||
[hash=index|md5|sha1] [no_fallback] [secure] [httponly]; | ||
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- name: the name of the cookies used to track the persistant upstream srv; | ||
default: route | ||
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- domain: the domain in which the cookie will be valid | ||
default: nothing. Let the browser handle this. | ||
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- path: the path in which the cookie will be valid | ||
default: / | ||
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- expires: the validity duration of the cookie | ||
default: nothing. It's a session cookie. | ||
restriction: must be a duration greater than one second | ||
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- hash: the hash mechanism to encode upstream server. It cant' be used with hmac. | ||
default: md5 | ||
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- 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! | ||
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- 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. | ||
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- hmac_key: the key to use with hmac. It's mandatory when hmac is set | ||
default: nothing. | ||
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- 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. | ||
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- secure enable secure cookies; transferred only via https | ||
- httponly enable cookies not to be leaked via js | ||
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# Detail Mechanism | ||
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- see docs/sticky.{vsd,pdf} | ||
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# Issues and Warnings: | ||
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- when using different upstream-configs with stickyness that use the same domain but | ||
refer to different location - configs it might be wise to set a different path / route - | ||
option on each of this upstream-configs like described here: | ||
https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/issue/7/leaving-cookie-path-empty-in-module | ||
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- sticky module does not work with the "backup" option of the "server" configuration item. | ||
- sticky module might work with the nginx_http_upstream_check_module (up from version 1.2.3) | ||
- sticky module may require to configure nginx with SSL support (when using "secure" option) | ||
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# Contributing | ||
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- please send/suggest patches as diffs | ||
- tickets and issues here: https://bitbucket.org/nginx-goodies/nginx-sticky-session-ng | ||
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# Downloads | ||
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- tarballs are available via tags from the repo: https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/downloads | ||
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# TODO | ||
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see Todo.md | ||
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# Authors & Credits | ||
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- Jerome Loyet, initial module | ||
- Markus Linnala, httponly/secure-cookies-patch | ||
- Peter Bowey, Nginx 1.5.8 API-Change | ||
- Michael Chernyak for Max-Age-Patch | ||
- anybody who suggested a patch, created an issue on bitbucket or helped improving this module | ||
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# Copyright & License | ||
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This module is licenced under the BSD license. | ||
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Copyright (C) 2010 Jerome Loyet (jerome at loyet dot net) | ||
Copyright (C) 2014 Markus Manzke (goodman at nginx-goodies dot com) | ||
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Redistribution and use in source and binary forms, with or without | ||
modification, are permitted provided that the following conditions | ||
are met: | ||
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1. Redistributions of source code must retain the above copyright | ||
notice, this list of conditions and the following disclaimer. | ||
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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. | ||
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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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