Services¶

To setup daemons to run at boot time or be able to easily start/stop them, we need to the init system. Create a file in /etc/init.d like the one below:

# /etc/init.d/netscan
#

# Some things that run always
DAEMON_USER=root
DIR=/home/pi/github/netscan
DAEMON_NAME=netscan
SERVER_NAME=simple_server
DAEMON=$DIR/$DAEMON_NAME.py
SERVER=$DIR/$SERVER_NAME.py
PIDFILE=/var/run/$DAEMON_NAME.pid
SERVER_PIDFILE=/var/run/$SERVER_NAME.pid

. /lib/lsb/init-functions

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting netscan"
    log_daemon_msg "Starting system $DAEMON_NAME daemon"
    start-stop-daemon --start --background --pidfile $PIDFILE --make-pidfile --u
ser $DAEMON_USER --chuid $DAEMON_USER --startas $DAEMON
    start-stop-daemon --start --background --pidfile $SERVER_PIDFILE --make-pidf
ile --user pi --chuid pi --startas $SERVER
    log_end_msg $?
    ;;
  stop)
    log_daemon_msg "Stopping system $DAEMON_NAME daemon"
    start-stop-daemon --stop --pidfile $PIDFILE --retry 10
    start-stop-daemon --stop --pidfile $SERVER_PIDFILE --retry 10
    log_end_msg $?
    ;;
  status)
    status_of_proc $SERVER_NAME $SERVER && status_of_proc $DAEMON_NAME $DAEMON &
& exit 0 || exit $?
    ;;
  *)
    echo "Usage: /etc/init.d/netscan {start|status|stop}"
    exit 1
    ;;
esac

exit 0

Another example:

# /etc/init.d/nodesjs
#

# Some things that run always
DAEMON_USER=root
DIR=/usr/local/bin
DAEMON_NAME=http-server
DAEMON=$DIR/$DAEMON_NAME
PIDFILE=/var/run/$DAEMON_NAME.pid
DAEMON_full="$DAEMON -- /mnt/usbdrive -p 9000 -s"

. /lib/lsb/init-functions

# Carry out specific functions when asked to by the system
case "$1" in
  start)
        echo "Starting Nodejs HTTP Server for movies"
        echo $DAEMON_full
        log_daemon_msg "Starting system $DAEMON_NAME daemon"
        start-stop-daemon --start --background --pidfile $PIDFILE --make-pidfile --user $DAEMON_USER --chuid $DAEMON_USER --startas $DAEMON_full
        log_end_msg $?
        ;;
  stop)
        log_daemon_msg "Stopping system $DAEMON_NAME daemon"
        start-stop-daemon --stop --pidfile $PIDFILE --retry 10
        log_end_msg $?
        ;;
  status)
        status_of_proc status_of_proc $DAEMON_NAME $DAEMON && exit 0 || exit $?
        ;;
  *)
        echo "Usage: /etc/init.d/nodejs-movies {start|status|stop}"
        exit 1
        ;;
esac

exit 0

Change the permissions with:

chmod 755 /etc/init.d/netscan

Add the service to the proper run levels:

update-rc.d netscan defaults

Services¶

References¶