lua与redis结合应用于nginx的动态upstream
技术要求很简明： nginx分发请求的时候，upstream是由lua从redis中读取配置动态生成的，这样便于用程序动态修改。 装好nginx+lua，过程不表。 把lua redis的模块配到路径中 wget https://raw.github.com/nrk/redis-lua/version-2.0/src/redis.lua nginx配置如下： server { listen 80; server_name _; server_name_in_redirect off; port_in_redirect off; root /root/html; location / { set $upstream ""; rewrite_by_lua ' -- load global route cache into current request scope -- by default vars are not shared between requests local routes = _G.routes -- setup routes cache if empty if routes == nil then routes = {} ngx.log(ngx.ALERT, "Route cache is empty.") end -- try cached route first local route = routes[ngx.var.http_host] if route == nil then local redis = require "redis" local client = redis.connect("localhost", 6379) route = client:get(ngx.var.http_host) end -- fallback to redis for lookups if route ~= nil then ngx.var.upstream = route routes[ngx.var.http_host] = route _G.routes = routes else ngx.exit(ngx.HTTP_NOT_FOUND) end '; proxy_buffering off; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_redirect off; proxy_connect_timeout 10; proxy_send_timeout 30; proxy_read_timeout 30; proxy_pass http://$upstream; } } 送进redis一些数据 ...