Dyups模块

发布于 2015-09-03 15:55:26 | 1818 次阅读 | 评论: 0 | 来源: 网络整理

• ngxhttpdyups_module

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

TODO:

It can not work with common nginx_upstream_check_module.

The module is not compiled into Tengine by default. It can be enabled with '--with-httpdyupsmodule' configuration parameter, and enabled lua support with '--with-httpdyupslua_api'. But it can not be compiled as a '.so'.

file: conf/nginx.conf

daemon off;
error_log logs/error.log debug;

events {
}

http {

    dyups_upstream_conf  conf/upstream.conf;

    include conf/upstream.conf;

    server {
        listen   8080;

        location / {
            proxy_pass http://$host;
        }
    }

    server {
        listen 8088;
        location / {
            echo 8088;
        }
    }

    server {
        listen 8089;
        location / {
            echo 8089;
        }
    }

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

file: conf/upstream.conf

upstream host1 {
    server 127.0.0.1:8088;
}

upstream host2 {
    server 127.0.0.1:8089;
}

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.

Syntax: dyups_read_msg_timeout time

Default: 1s

Context: main

This directive set the interval of workers readding the commands from share memory.

Syntax: dyups_shm_zone_size size

Default: 2M

Context: main

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

Syntax: dyups_upstream_conf path

Default: none

Context: main

This directive set the path of file which you dumped all of upstreams' configs, it will be loaded in init process after process respwan to restore upstreams.

Syntax: dyups_trylock on | off

Default: off

Context: main

You will get a better prefomance but it maybe not stable, and you will get a '409' when the update request conflicts with others.

• /detail get all upstreams and their servers
• /list get the list of upstreams
• /upstream/name find the upstream by it's name

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

• /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.

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

```bash » curl -H "host: dyhost" 127.0.0.1:8080

» 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

host2 server 127.0.0.1:8089

dyhost server 127.0.0.1:8089 server 127.0.0.1:8088

» 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

host2 server 127.0.0.1:8089 ```

c 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);

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

```lua contentbylua ' local dyups = require "ngx.dyups"

local status, rv = dyups.update("test", [[server 127.0.0.1:8088;]]);
ngx.print(status, rv)
if status ~= 200 then
    ngx.print(status, rv)
    return
end
ngx.print("update success")

status, rv = dyups.delete("test")
if status ~= 200 then
    ngx.print(status, rv)
    return
end
ngx.print("delete success")

';

```