
Procfile Naming and Location
A Procfile is a simple text file. It should be named Procfile
 exactly and should not have any extensions, like .txt
 or .py
. Note that naming the file procfile
will not work either, as it is case-sensitive.
Locate your Procfile in the root folder of your project. It won’t work in any other location.
Procfile Processes
The Procfile
 outlines the type of processes a Backend Capsule needs to run before deploying a backend application. Common processes include but are not limited to web
, worker
, and clock
 processes. When declaring a process type, you should also write the command to run for that particular process.
A process type command allows you to specify the port you’d like the process to run, as well as other options that are process-specific.
Procfile Format
The Procfile’s format is a key value listing of process types and their commands on each line, as shown below:
<process type>: <command>
Example Procfile for Python’s Flask
Code Capsules only requires a Procfile for Python applications. Here is an example of what a Procfile for a Flask application might look:
web: python3 -m flask run --host=0.0.0.0 --port=$PORT
Procfiles for Other Languages
Express and Java applications don’t need a Procfile to be deployed. The Backend Capsule can detect these applications and run the processes relevant to the application being deployed.