logging - How to read files and stdout from a running Docker container

Question

How would I go about starting an application in my host machine in order to read files and stdout from a running docker container?

Essentially I want to do this:

docker start containerid   
./myapp // This app will *somehow* have access files and stdout generated by the container I just stared. 

How would I go about doing that? To be more specific with where I am trying to go with this; I want to read the logs and stdout of a docker container and have those logs processed somewhere else.

I am also willing to create another docker container which can read files and stdout from another container, but I don't know if that's possible.

Answer 1

Waitting for answers