Scalling Up Application with Docker

Hi Everyone, I just wondering to know how can I scale up my application which is running into a docker container.
For example I have a web server, That is packaged into a docker Image. Lets say, I have deployed the container using this image. After some days, If I need more processing power, more ram then how can I scale up. Besides I would like to know can I bind a container with specific amount of ram and cpu.
Thanks in Advanced.