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yzprofile/ngx_http_dyups_module

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Description

This module can be used to update your upstream-list without reloadding Nginx.

Table of Contents

Example

file: conf/nginx.conf

ATTENTION: You MUST use nginx variable to do proxy_pass

daemon off;
error_log logs/error.log debug;

events {
}

http {

    include conf/upstream.conf;

    server {
        listen   8080;

        location / {
            # The upstream here must be a nginx variable
            proxy_pass http://$dyups_host;
        }
    }

    server {
        listen 8088;
        location / {
            return 200 "8088";
        }
    }

    server {
        listen 8089;
        location / {
            return 200 "8089";
        }
    }

    server {
        listen 8081;
        location / {
            dyups_interface;
        }
    }
}

If your original config looks like this:

proxy_pass http://upstream_name;

please replace it with:

set $ups upstream_name;
proxy_pass http://$ups;

$ups can be any valid nginx variable.

file: conf/upstream.conf

upstream host1 {
    server 127.0.0.1:8088;
}

upstream host2 {
    server 127.0.0.1:8089;
}

Installation

  • Only install dyups module
$ git clone git://github.com/yzprofile/ngx_http_dyups_module.git

# to compile as a static module
$ ./configure --add-module=./ngx_http_dyups_module

# to compile as a dynamic module
$ ./configure --add-dynamic-module=./ngx_http_dyups_module
  • Install dyups module with lua-nginx-module and upstream check module
    • upstream check module: To make upstream check module work well with dyups module, you should use patched upstream check module.
    • lua-nginx-module: To enable dyups LUA API, you MUST put --add-module=./lua-nginx-module in front of --add-module=./ngx_http_dyups_module in the ./configure command.
$ git clone git://github.com/yzprofile/ngx_http_dyups_module.git
$ git clone git@github.com:yzprofile/nginx_upstream_check_module.git
$ git clone git@github.com:openresty/lua-nginx-module.git

# to compile as a static module
$ ./configure --add-module=./nginx_upstream_check_module --add-module=./lua-nginx-module --add-module=./ngx_http_dyups_module

Directives

dyups_interface

Syntax: dyups_interface

Default: none

Context: loc

This directive set the interface location where you can add or delete the upstream list. See the section of Interface for detail.

dyups_shm_zone_size

Syntax: dyups_shm_zone_size size

Default: 2MB

Context: main

This directive set the size of share memory which used to store the commands.

restful interface

GET

  • /list get the list of upstreams

POST

  • /upstream/name update one upstream
  • body commands;
  • body server ip:port;

DELETE

  • /upstream/name delete one upstream

Call the interface, when you get the return code is HTTP_INTERNAL_SERVER_ERROR 500, you need to reload nginx to make the Nginx work at a good state.

If you got HTTP_CONFLICT 409, you need resend the same commands again latter.

The /list and /detail interface will return HTTP_NO_CONTENT 204 when there is no upstream.

Other code means you should modify your commands and call the interface again.

ATTENTION: You also need a third-party to generate the new config and dump it to Nginx'conf directory.

Sample

» curl -H "host: dyhost" 127.0.0.1:8080
<html>
<head><title>502 Bad Gateway</title></head>
<body bgcolor="white">
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.3.13</center>
</body>
</html>

» curl -d "server 127.0.0.1:8089;server 127.0.0.1:8088;" 127.0.0.1:8081/upstream/dyhost
success

» curl -H "host: dyhost" 127.0.0.1:8080
8089

» curl -H "host: dyhost" 127.0.0.1:8080
8088

» curl 127.0.0.1:8081/detail
host1
server 127.0.0.1:8088 weight=1 max_conns=0 max_fails=1 fail_timeout=10 backup=0 down=0

host2
server 127.0.0.1:8089 weight=1 max_conns=0 max_fails=1 fail_timeout=10 backup=0 down=0

dyhost
server 127.0.0.1:8089 weight=1 max_conns=0 max_fails=1 fail_timeout=10 backup=0 down=0
server 127.0.0.1:8088 weight=1 max_conns=0 max_fails=1 fail_timeout=10 backup=0 down=0

» curl -i -X DELETE 127.0.0.1:8081/upstream/dyhost
success

» curl 127.0.0.1:8081/detail
host1
server 127.0.0.1:8088 weight=1 max_conns=0 max_fails=1 fail_timeout=10 backup=0 down=0

host2
server 127.0.0.1:8089 weight=1 max_conns=0 max_fails=1 fail_timeout=10 backup=0 down=0

C API

extern ngx_flag_t ngx_http_dyups_api_enable;
ngx_int_t ngx_dyups_update_upstream(ngx_str_t *name, ngx_buf_t *buf,
    ngx_str_t *rv);
ngx_int_t ngx_dyups_delete_upstream(ngx_str_t *name, ngx_str_t *rv);

extern ngx_dyups_add_upstream_filter_pt ngx_dyups_add_upstream_top_filter;
extern ngx_dyups_del_upstream_filter_pt ngx_dyups_del_upstream_top_filter;

Lua API Example

NOTICE: you should add the directive dyups_interface into your config file to active this feature

content_by_lua '
    local dyups = require "ngx.dyups"

    local status, rv = dyups.update("test", [[server 127.0.0.1:8088;]]);
    ngx.print(status, rv)
    if status ~= ngx.HTTP_OK then
        ngx.print(status, rv)
        return
    end
    ngx.print("update success")

    status, rv = dyups.delete("test")
    if status ~= ngx.HTTP_OK then
        ngx.print(status, rv)
        return
    end
    ngx.print("delete success")
';

Change Log

RELEASE V0.2.9

Feature: Added add/del upstream filter to make other modules operate upstream easily after upstream changed

RELEASE V0.2.8

Bugfixed: upstream connect failed caused coredump

RELEASE V0.2.7

Supported: C API and Lua API

RELEASE V0.2.6

Bugfixed: Supported sandbox before updatting

RELEASE V0.2.5

  1. Bugfixed: wrong string comparison for string "upstream", @chobits
  2. Bugfixed: that response of /detail uri has no Content-Length header, @chobits
  3. Feature: if you use this branch of tengine, update upstream rbtree, @SarahWang
  4. Feature: simplify upstream parsing methods via ngx_conf_parse api, @chobits

RELEASE V0.2.4

  1. Bugfixed: client timed out cause a coredumped while adding an exist upstream
  2. Bugfixed: when proxy_pass to a no-variable address dyups will coredump

RELEASE V0.2.2

  1. Bugfixed: upstream will be deleted in the process of finding upstream.

RELEASE V0.2.0

  1. check every commands to make sure they are all ok before update upstream. done

  2. support ip_hash and keepalive or other upstream module done

  3. support weight,max_fails,fail_timeout,backup done

  4. support health check module, you should use this branch of Tengine or wait for it's release. done

  5. restore upstream configuration in init process handler. done

Compatibility

Tengine Compatibility

This module has been merged into Tengine.

Module Compatibility

Run Tests

$ hg clone http://hg.nginx.org/nginx-tests/ ..
(Or git clone git@github.com:nginx/nginx-tests/ .. if you prefer the GitHub mirror)
$ TEST_NGINX_BINARY=/path/to/your/nginx/dir/sbin/nginx prove -I ../nginx-tests/lib ./t/dyups.t

To make the tests pass, you should also install lua-nginx-module and patched upstream check module.

Author

yzprofile (袁茁) yzprofile@gmail.com

chobits (王笑臣) wangxiaochen0@gmail.com, Alibaba Inc.

Copyright & License

These codes are licenced under the BSD license.

Copyright (C) 2012-2020 by Zhuo Yuan (yzprofile) <yzprofiles@gmail.com>

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    * 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 THE COPYRIGHT HOLDERS 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 THE COPYRIGHT
HOLDER 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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[Deprecated] update upstreams' config by restful interface

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