I want to redirect all the logs for my web app to a particular log file
I am looking for one common setting ( code/ini ) that can re-direct all the logs for my app to a particular file.
You should be able to use the regular python logging handlers to set up file logging. See Pyramid's docs and the Python docs. For example, here's part of a logger config I've used to set up a rotating file log on the file system:
[handler_filelog]
class = logging.handlers.TimedRotatingFileHandler
args = ('/path/to/mylog.log','D', 1, 15)
level = NOTSET
formatter = generic