add doc for ngx_http_dyups_module

driftingsnow25 · Aug 13, 2015 · f40f0b7 · f40f0b7
1 parent e1b251c
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diff --git a/docs/modules/ngx_http_dyups_module.md b/docs/modules/ngx_http_dyups_module.md
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+Name
+====
+
+* ngx_http_dyups_module
+
+Description
+===========
+
+This module can be used to update your upstream-list without reloadding Nginx.
+
+TODO:
+
+It can not work with common `nginx_upstream_check_module`.
+
+
+Compilation
+===========
+
+The module is not compiled into Tengine by default. It can be enabled with '--with-http_dyups_module'
+configuration parameter, and enabled lua support with '--with-http_dyups_lua_api'.
+But it can not be compiled as a '.so'.
+
+Example
+==========
+
+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;
+    }
+
+
+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_read_msg_timeout
+-----------------------------
+
+**Syntax**: *dyups_read_msg_timeout time*
+
+**Default**: *1s*
+
+**Context**: *main*
+
+This directive set the interval of workers readding the commands from share memory.
+
+dyups_shm_zone_size
+-----------------------------
+
+**Syntax**: *dyups_shm_zone_size size*
+
+**Default**: *2M*
+
+**Context**: *main*
+
+This directive set the size of share memory which used to store the commands.
+
+dyups_upstream_conf
+-----------------------------
+
+**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.
+
+dyups_trylock
+-----------------------------
+
+**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.
+
+
+restful interface
+========================
+
+GET
+-------------------
+
+* `/detail`         get all upstreams and their servers
+* `/list`           get the list of upstreams
+* `/upstream/name`  find the upstream by it's name
+
+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.
+
+`ATTENEION`: You also need a `third-party` to generate the new config and dump it to Nginx'conf directory.
+
+Sample
+-------------------
+```bash
+» 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
+
+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
+```
+
+API
+========================
+
+```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);
+```
+
+## Lua API Example
+
+NOTICE:
+    you should add the directive `dyups_interface` into your config file to active this feature
+
+```lua
+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 ~= 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")
+';
+
+```