nginx.conf

worker_processes  16;
error_log /usr/local/openresty/nginx/logs/perror.log;
events {
    worker_connections 1024;
}
stream {

    log_format tcp_proxy '$remote_addr [$time_local] '
                         '$protocol $status $bytes_sent $bytes_received '
                         '$session_time "$upstream_addr" '
                         '"$upstream_bytes_sent" "$upstream_bytes_received" "$upstream_connect_time"';

    access_log /usr/local/openresty/nginx/logs/paccess.log tcp_proxy;
    open_log_file_cache off;


    upstream backend{
        server 0.0.0.0:80;
        balancer_by_lua_block {

            local balancer = require "ngx.balancer"
            local host = ""
            local port = 0
            host = ngx.ctx.proxy_host
            port = ngx.ctx.proxy_port
            -- 设置 balancer
            local ok, err = balancer.set_current_peer(host, port)
            -- local ok=0
            if not ok then
                ngx.log(ngx.ERR, "failed to set the peer: ", err)
            end
        }
    }
    server {
        preread_by_lua_block{

                # local redis = require "resty.redis"
                # local red = redis:new()
                # red:set_timeouts(1000, 1000, 1000)
                # local ok, err = red:connect("192.168.110.3", 6379)
                
                # if not ok then
                #     ngx.log(ngx.ERR,"failed to connect: ", err)
                #     return red:close()
                # end
                
                # -- pass参数为你的redis连接密码
                # local pass = "123456"
                # local res, err = red:auth(pass)
                # if not res then
                #     ngx.log(ngx.ERR,"failed to authenticate: ", err)
                #     return
                # end

                # local rkey = "use_proxy"
                # local res, err = red:hkeys(rkey)
                # if not res then
                #         ngx.log(ngx.ERR,"res num error : ", err)
                #         return red:close()
                # end

                # local radmnum = math.randomseed(tonumber(tostring(ngx.now()):reverse():sub(1, 6)))
                # local proxy = res[math.random(#res)]
                # -- ngx.log(ngx.ERR,"res num : ", proxy)
                # local colon_index = string.find(proxy, ":")
                # local proxy_ip = string.sub(proxy, 1, colon_index - 1)
                # local proxy_port = string.sub(proxy, colon_index + 1)
                # ngx.log(ngx.ERR,"redis data = ", proxy_ip, ":", proxy_port);
                local proxy_ip = "192.168.110.2"
                local proxy_port = "7171"
                ngx.ctx.proxy_host = proxy_ip
                ngx.ctx.proxy_port = proxy_port

                # local ok, err = red:close()
                # if not ok then
                #      ngx.log(ngx.ERR,"failed to close: ",tostring(err))
                #      return
                # end

        }

       listen 0.0.0.0:80;
       proxy_connect_timeout 3s;
       proxy_timeout 10s;
       proxy_pass backend;
   }
}