nginx+lua+redis+OpenResty缓存,限流

yum install -y gcc
yum install libtermcap-devel ncurses-devel libevent-devel readline-devel
curl -R -O http://www.lua.org/ftp/lua-5.3.5.tar.gz
tar -zxf lua-5.3.5.tar.gz
cd lua-5.3.5
make linux test
make install

yum install yum-utils
yum-config-manager --add-repo https://openresty.org/package/centos/openresty.repo
yum install openresty
安装成功后 会在默认的目录如下：
/usr/local/openresty

https://blog.csdn.net/qq_15070281/article/details/83073763?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param

#user nobody; 配置文件第一行原来为这样, 现改为下面的配置
user root root;

ngx.header.content_type="application/json;charset=utf8"
local uri_args = ngx.req.get_uri_args();
local id = uri_args["id"];  此处的id为获取传来的参数
-- --获取本地缓存
local cache_ngx = ngx.shared.dis_cache; 这个缓存是要读取nginx
-- --根据ID 获取本地缓存数据
local contentCache = cache_ngx:get('content_cache_'..id);
 
if contentCache == "" or contentCache == nil then
    local redis = require("resty.redis");
    local red = redis:new()
    red:set_timeout(2000)
    red:connect("192.168.16.55", 6379)更换自己的redis
    local rescontent=red:get("content_"..id);
 
    if ngx.null == rescontent then
        local cjson = require("cjson");
        local mysql = require("resty.mysql");
        local db = mysql:new();
        db:set_timeout(2000)
        local props = {
            host = "192.168.16.55",更换自己的mysql
            port = 3306,
            database = "gtf_content",更换自己的数据库mingz
            user = "root",
            password = "root"
        }
        local res = db:connect(props);
        local select_sql = "select url,pic from gtf_content where status ='1' and category_id="..id.." order by sort_order";
更换自己的sql语句
        res = db:query(select_sql);
        local responsejson = cjson.encode(res);
        red:set("content_"..id,responsejson);
        ngx.say(responsejson);
        db:close()
    else
        cache_ngx:set('content_cache_'..id, rescontent, 10*60);
        ngx.say(rescontent)
    end
    red:close()
else
    ngx.say(contentCache)
end

lua_shared_dict dis_cache 5m;  #共享内存开启
# 设置限流配置
    limit_req_zone $binary_remote_addr zone=myRateLimit:10m rate=2r/s;

    server {  
        listen       8081;
        server_name  localhost;
        charset utf-8;
        location / {
            limit_req zone=myRateLimit;
            root   html;
            index  index.html index.htm;
        }
location /ad_read {
            limit_req zone=myRateLimit;
            content_by_lua_file /root/lua/ad_read.lua;
        }
    }