First you will need somewhere to store your settings. Create a file called
example.yml in the
configdirectory and a file called
example.rb in the
config/initializers directory. A minimal
example.yml file contains this
development:
pid_file: /var/run/example.pid
sleep_for: 10
# Same for production and test
The
example.rb file should look like this
EXAMPLE = YAML.load_file("#{RAILS_ROOT}/config/example.yml")[RAILS_ENV]
You can now access all your settings from the global
EXAMPLE hash. Now we need to create a script to run, the skeleton of which is stored in the
scripts directory (using the same
set_pid code from a previous post)
def set_pid(filename)
# Code from the previous post
end
logger = Logger.new("#{RAILS_ROOT}/log/example.log", 'daily')
logger.formatter = Logger::Formatter.new()
if set_pid(EXAMPLE['pid_file'])
logger.info "Example started, polling every #{EXAMPLE['sleep_for']} seconds"
else
logger.error "Example is already running"
exit
end
$continue = true
trap(:SIGTERM) { $continue = false }
while $continue
# Do your stuff here
sleep POLL['sleep_for']
end
logger.info "Shutting down"
Finally we need to make sure that the process is started up when the machine starts up we need this script (
example._ctl) in
/etc/init.d#!/bin/sh
PID=/var/run/example.pid
# Find the name of the script
NAME=`basename $0`
script_result=0
start()
{
su --login example_user --command "cd /home/application/path/current ; /usr/bin/env ruby script/runner -e production script/example.rb &"
echo "Starting $NAME service: OK"
}
stop()
{
if [ -r $PID ]
then
kill `cat $PID`
STATUS="OK"
else
STATUS="FAILED"
script_result=1
fi
echo "Stopping $NAME service: $STATUS"
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
*)
echo "Usage: $0 {start|stop|restart}"
exit 1
esac
exit $script_result
