ProcFile

About

A Procfile ¹⁾ is a text file that maps:

command
to a name

The command are executed by a manager used in the entrypoint

Syntax

name: <command>

where:

name is a command name

Example

A Procfile with two commands:

web: bundle exec rails server -p $PORT
foo: /app/foo

Docker and the overmind procfile manager

RUN apt-get update && \
    apt-get install -y \ 
        tmux \ # mandatory for overmind
        wget
# ...

RUN set -ex \
        && wget -q https://github.com/DarthSim/overmind/releases/download/v2.0.0/overmind-v2.0.0-linux-amd64.gz \
        && gunzip overmind-v2.0.0-linux-amd64.gz \
        && chmod +x overmind-v2.0.0-linux-amd64 \
        && mv overmind-v2.0.0-linux-amd64 /usr/local/bin/overmind

ADD Procfile /app/
CMD overmind start

Manager

Overmind

overmind

Because it wraps tmux, you can get a terminal window on any of your running programs.

After connecting to your container via bash

root@30952b25:/# cd /app
root@30952b25:/# overmind connect foo

Foreman

The first one formean

¹⁾

https://devcenter.heroku.com/articles/procfile