nginx+lua (二)请求分发
比如对产品productId=143这个请求分发
现编写lua脚本
distrib_product.lua
local uri_args = ngx.req.get_uri_args()
local productId = uri_args["productId"]
--获取链接地址 和 productId参数
local hosts = {"172.16.95.145","172.16.95.146","172.16.95.147"}
local hash = ngx.crc32_long(productId)
local hosts_cnt = #hosts
local index = (hash % hosts_cnt) + 1
--分发的主机地址 对参数取模
backend = "http://"..hosts[index]
local method = uri_args["method"]
local requestBody = "/"..method.."?productId="..productId
local http = require("resty.http")
local httpc = http.new()
local resp,err = httpc:request_uri(backend,{
method = "GET",
path = requestBody
})
if not resp then
ngx.say("requst err:",err)
return
end
ngx.say(resp.body)
httpc:close()
新建配置文件
distrib.conf
server {
listen 80;
server_name _;
location /dis {
default_type 'text/html';
#lua_code_cache off;
content_by_lua_file /usr/distrib_product/lua/distrib_product.lua;
}
}
在 ngix.conf 中 include /usr/distrib_product/distrib.conf;