nginx-lia.md

+###nginx-lua模块集中化管理
+-nginx代码实例
+```
+location / {
+    set $pass "127.0.0.1:6001";
+    set $cache 0;
+    set $fenxiLog 0;
+    access_by_lua_file /usr/local/nginx/lua_modules/lua_router.lua;
+}   
+location @cache {
+    include nginx_cache.conf;
+    if ($fenxiLog = 1) {
+        access_log /usr/local/nginx/logs/access.m.yohobuy.com.log  fenxi;
+    }
+    resolver 8.8.8.8;
+    proxy_pass http://$pass;
+}   
+location @noCache {
+    if ($fenxiLog = 1) {
+        access_log /usr/local/nginx/logs/access.m.yohobuy.com.log  fenxi;
+    }
+    resolver 8.8.8.8;
+    proxy_pass http://$pass;
+}
+```
+所有nginx请求由`` location / ``处理，初始化后续逻辑用到的参数，并调用lua模块
+-lua_router.lua lua处理模块
+```
+package.path = "/usr/local/nginx/lua_modules/?.lua"
+local config = require("lua_config")
+for k, v in ipairs(config) do
+    if ngx.re.match(ngx.var.uri, v.router) then
+        ngx.var.cache = v.cache
+        ngx.var.pass= v.proxy_pass
+        ngx.var.fenxiLog = v.fenxiLog
+        break;
+    end
+end
+if ngx.var.cache == "1" then
+    ngx.exec("@cache", ngx.var)
+else 
+    ngx.exec("@noCache", ngx.var)
+end     
+```
+lua导入配置文件中的路由配置，匹配到当前请求，获得配置数据（缓存配置需要分location内部转发，其他配置项通过变量返回到nginx作用域中）
+-以及lua配置文件 lua_config.lua
+```
+local config = {
+    {
+        router = "/product/product/show_", --路由规则
+        cache = 1,                         --是否缓存
+        proxy_pass = "127.0.0.1:6001",     --反向url
+        fenxiLog = 1                       --是否存储log（fenxi）
+    },{ 
+        router = "/boys",
+        cache = 1, 
+        proxy_pass = "127.0.0.1:6001",
+        fenxiLog = 1
+    },{ 
+        router = "/girls",
+        cache = 0, 
+        proxy_pass = "127.0.0.1:6001",
+        fenxiLog = 1
+    },{ 
+        router = "/home",
+        cache = 1, 
+        proxy_pass = "m.yohobuy.com",
+        fenxiLog = 1
+    }
+}
+return config
+```
+返回到nginx的location中后根据lua返回变量值处理不同情况的请求
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