Unicorn shell script

gistfile1.txt

#!/usr/bin/env bash
set -e

### Unicorn variables ###
TIMEOUT=${TIMEOUT-60}
APP_ROOT=/path/to/project
PID_PATH=$APP_ROOT/tmp/pids
PID=$PID_PATH/unicorn.pid
USER=ubuntu
GROUP=ubuntu

# See http://technology.customink.com/blog/2012/03/16/simple-garbage-collection-tuning-for-rails/
export RUBY_GC_MALLOC_LIMIT=60000000
export RUBY_HEAP_MIN_SLOTS=1800000          # Slots Live + 20%
export RUBY_FREE_MIN=18000                  # 1% of HEAP_MIN_SLOTS
export RUBY_HEAP_SLOTS_INCREMENT=144000     # 8% of HEAP_MIN_SLOTS
export RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
export LD_PRELOAD=/usr/lib/libtcmalloc_minimal.so.0.1.0

CMD="$APP_ROOT/bin/unicorn -D -E $RAILS_ENV -c $APP_ROOT/config/unicorn.rb"

INIT_CONF=$APP_ROOT/config/unicorn.conf

action="$1"
set -u

test -f "$INIT_CONF" && . $INIT_CONF

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`
}

workersig () {
  workerpid=$PID_PATH/worker.$2.pid
  test -s "$workerpid" && kill -$1 `cat $workerpid`
}

create_pid_path () {
  test -d $PID_PATH || ( mkdir -p $PID_PATH && chown $USER.$GROUP $PID_PATH )
}

run () {
  if [ "$(id -un)" = "$USER" ]; then
    eval $1
  else
    su -c "$1" - $USER
  fi
}

case $action in
start)
  create_pid_path
  sig 0 && echo >&2 "Already running" && exit 0
  run "$CMD"
;;
stop)
  sig QUIT && exit 0
  echo >&2 "Not running"
;;
force-stop)
  sig TERM && exit 0
  echo >&2 "Not running"
;;
restart|reload)
  sig HUP && echo reloaded OK && exit 0
  echo >&2 "Couldn't reload, starting '$CMD' instead"
  run "$CMD"
;;
upgrade)
  sig USR2 && exit 0
  echo >&2 "Couldn't upgrade, starting '$CMD' instead"
  run "$CMD"
;;
status)
  sig 0 && echo "running with pid `cat $PID`" && exit 0
  echo stopped && exit 1
;;
kill_worker)
  workersig QUIT $2 && exit 0
  echo >&2 "Worker not running"
;;
reopen-logs)
  sig USR1
;;
*)
  echo >&2 "Usage: $0 <start|stop|status|restart|upgrade|status|force-stop|reopen-logs|kill_worker>"
  exit 1
;;
esac