worker_processes  1;
error_log logs/error.log;
events {
    worker_connections 1024;
}
http {
    server {
        listen 8080;
set $target '';
         location / {
            access_by_lua '
            local t = io.popen("/app/checkPort")
            local a = t:read("*all")

            if( string.gsub(a,"%D","") == "0"  )
            then
                ngx.var.target="http://127.0.0.1:5000"
            else
                ngx.var.target="http://127.0.0.1:2233"
            end
';
proxy_pass   $target;
         }
    }
}