Another one Puma shell script. Here i can set path to Puma config. Very useful for multiple environments.

puma.rb

# Capistrano 3 tasks for Puma

namespace :puma do

  %w[start stop restart status].each do |command|
    desc "#{command} puma"
    task command do
      on roles (:app) do
        within current_path do
          execute "bin/puma.sh", "#{command} -c config/puma/#{fetch(:stage)}.rb"
        end
      end
    end
  end

end

puma.sh

#!/usr/bin/env bash

# Simple move this file into your Rails `script` folder. Also make sure you `chmod +x puma.sh`.
# Please modify the CONSTANT variables to fit your configurations.

# The script will start with config set by $PUMA_CONFIG_FILE by default

PUMA_CONFIG_FILE=config/puma.rb
PUMA_PID_FILE=tmp/pids/puma.pid
PUMA_SOCKET=tmp/sockets/puma.sock
# PUMA_ENVIRONMENT=development

# check if puma process is running
puma_is_running() {
  if [ -S $PUMA_SOCKET ] ; then    
    if [ -e $PUMA_PID_FILE ] ; then
      if kill -0 `cat $PUMA_PID_FILE` ; then
        return 0
      else
        echo "No puma process found"
      fi
    else
      echo "No puma pid file found"
    fi
  else
    echo "No puma socket found"
  fi

  return 1
}

case "$2" in
  # -e|--environment) PUMA_ENVIRONMENT="$3" ;;
  -c|--config) PUMA_CONFIG_FILE="$3" ;;
  --) ;;
  *) ;;
esac

case "$1" in
  start)
    echo "Starting puma..."
    rm -f $PUMA_SOCKET
    if [ -e $PUMA_CONFIG_FILE ] ; then
      bundle exec puma --config $PUMA_CONFIG_FILE #--environment $PUMA_ENVIRONMENT
    else
      bundle exec puma --daemon --bind unix://$PUMA_SOCKET --pidfile $PUMA_PID_FILE #--environment $PUMA_ENVIRONMENT
    fi

    echo "done"
    ;;

  stop)
    echo "Stopping puma..."
      kill -s SIGTERM `cat $PUMA_PID_FILE`
      rm -f $PUMA_PID_FILE
      rm -f $PUMA_SOCKET

    echo "done"
    ;;

  restart)
    if puma_is_running ; then
      echo "Hot-restarting puma..."
      kill -s SIGUSR2 `cat $PUMA_PID_FILE`

      echo "Doublechecking the process restart..."
      sleep 5
      if puma_is_running ; then
        echo "done"
        exit 0
      else
        echo "Puma restart failed :/"
      fi
    fi

    echo "Trying cold reboot"
    bin/puma.sh start --config $PUMA_CONFIG_FILE
    ;;
    
  status)
    if puma_is_running ; then
      echo "puma is running"
      exit 0
    else
      echo "puma is not running"
      exit 1 # return error
    fi
 
    ;;

  *)
    echo "Usage: bin/puma.sh {start|stop|restart|status}" >&2
    ;;
esac