Some pitfalls using docker to host Nginx and php-fpm

I'm deploying my WordPress on AWS with Lambda function, all the services are coerced in one container. (I was intended to separate into different services, e.g. MySQL, Nginx, lambda-php-server, but not necessary) And I would get into 504 for Nginx.

My frontend Nginx do a proxy_pass to the backend Lambda function which always shows timeout. I was to think the performance of the chassis is bad, or some cgroup stuff is cast on the service. The log from behind Nginx shows there's setrlimit(RLIMIT_NOFILE, 51200) failed (1: Operation not permitted) I realize I have to give privilege to the Docker runtime. It will setrlimit to the host machine.

docker run -c 1024 --blkio-weight 600  -d -e https_proxy= -e http_proxy= -p 8022:22  -p 8443:443 -p 888:888 -p 3306:3306 -p 8888:8888 yangyw12345/wordpress_mainpage sh -c "while true;do echo hello world; sleep 100000;done"