问题
I have a simple Procfile that reads:
web: bundle exec rails server thin -p $PORT
worker: bundle exec rake jobs:work
On Heroku, this will launch N worker tasks, where N is whatever I've scaled it to be.
On my development system,
$ foreman start
will only launch one worker task. If I want to launch three workers, I need a Procfile that looks like:
web: bundle exec rails server thin -p $PORT
worker: bundle exec rake jobs:work
worker: bundle exec rake jobs:work
worker: bundle exec rake jobs:work
This is a somewhat pedantic question, but if I want my development environment to behave like my Heroku environment, what's the best way to launch N worker tasks? Is the approved way to create (e.g.) Procfile_local and use it via foreman -f Procfile_local?
回答1:
Ah. Who would have guessed that there's an online man page for foreman? ;)
foreman start --concurrency="web=0,worker=6"
Does the trick nicely. No need to have a separate Procfile.
回答2:
Latest Foreman has renamed the option to --formation.
So, it's:
foreman start --formation="web=1,worker=2"
Source
来源：https://stackoverflow.com/questions/11423307/starting-multiple-workers-in-procfile-development-environment-vs-heroku