Unicorn init script and configuration

unicorn_conf.rb

app_dir = File.expand_path("../..", __FILE__)
shared_dir = "#{app_dir}/shared"
working_directory app_dir
pid "#{shared_dir}/pids/unicorn.pid"

worker_processes 2
preload_app true
timeout 30

listen "#{shared_dir}/sockets/unicorn.sock", backlog: 64

stderr_path "#{shared_dir}/log/unicorn.stderr.log"
stdout_path "#{shared_dir}/log/unicorn.stdout.log"

before_fork do |server, worker|
  # Disconnect since the database connection will not carry over
  if defined? ActiveRecord::Base
    ActiveRecord::Base.connection.disconnect!
  end
end

after_fork do |server, worker|
  # Start up the database connection again in the worker
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
  end

  server.logger.info("worker=#{worker.nr} spawning in #{Dir.pwd}")

  # graceful shutdown.
  old_pid_file = "#{shared_dir}/pids/unicorn.pid.oldbin"

  if File.exists?(old_pid_file) && server.pid != old_pid_file
    begin
      old_pid = File.read(old_pid_file).to_i
      server.logger.info("sending QUIT to #{old_pid}")
      # we're killing old unicorn master right there
      Process.kill("QUIT", old_pid)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end
end

unicorn_foo

#!/bin/sh
set -u
set -e
# Example init script, this can be used with nginx, too,
# since nginx and unicorn accept the same signals

# Feel free to change any of the following variables for your app:
APP_ROOT=/path/to/app
PID=$APP_ROOT/shared/pids/unicorn.pid
ENV=production
CMD="$APP_ROOT/bin/unicorn -D -E $ENV -c config/unicorn.rb"

old_pid="$PID.oldbin"

cd $APP_ROOT || exit 1

sig () {
  test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
  test -s $old_pid && kill -$1 `cat $old_pid`
}

case $1 in
start)
  sig 0 && echo >&2 "Already running" && exit 0
  $CMD
  ;;
stop)
  sig QUIT && exit 0
  echo >&2 "Not running"
  ;;
force-stop)
  sig TERM && exit 0
  echo >&2 "Not running"
  ;;
upgrade)
  sig USR2 && exit 0
  echo >&2 "Couldn't upgrade, starting '$CMD' instead"
  $CMD
  ;;
rotate)
  sig USR1 && echo rotated logs OK && exit 0
  echo >&2 "Couldn't rotate logs" && exit 1
  ;;
*)
  echo >&2 "Usage: $0 <start|stop|upgrade|rotate|force-stop>"
  exit 1
  ;;
esac