[request] use environment variables for port numbers instead hard coding

[meokey]

It would offer much flexibility in doployment using docker, esp. when there are many containers running on the same host and there is conflict on the demanded port.

[sugarforever]

Thanks for raising it. That's a fair point. I will schedule it with priority. Docker support will be released in these 2 days. We can revisit this point and see what extra work needs to be done to support it.