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Daemonize and Autostart under Debian and RHEL
#############################################
:date: 2012-04-05 11:57
:tags: debian,redhat,autostart
Daemonizing and autostarting a process is still a pain in the ass, so
here are two scripts which can be placed under /etc/init.d and if you
are lucky everything will work.
Example is the punani backend, an universal package resolver and installer
which is essentially a python webserver (now obsolete).
debian init-script
==================
.. code-block:: bash
#! /bin/sh
# uses template from /etc/init.d/skeleton
### BEGIN INIT INFO
# Provides: punani
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: punani
# Description: starts punani daemon
#
### END INIT INFO
PATH=/sbin:/usr/sbin:/bin:/usr/bin
NAME=punani
DESC="$NAME daemon"
DAEMON=/usr/bin/python
DAEMON_ARGS="/krebs/punani/index.py"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
[ -x "$DAEMON" ] || exit 0
[ -r /etc/default/$NAME ] && . /etc/default/$NAME
. /lib/init/vars.sh
. /lib/lsb/init-functions
do_start()
{
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
start-stop-daemon -b --start --quiet --make-pidfile --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
|| return 1
start-stop-daemon -b --start --quiet --make-pidfile --pidfile $PIDFILE --exec $DAEMON -- \
$DAEMON_ARGS \
|| return 2
}
do_stop()
{
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
start-stop-daemon --stop --retry=TERM/30/KILL/5 --pidfile $PIDFILE
RETVAL="$?"
[ "$RETVAL" = 2 ] && return 2
rm -f $PIDFILE
return "$RETVAL"
}
do_reload() {
start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE
return 0
}
case "$1" in
start)
[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
do_start
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
stop)
[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
do_stop
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
status)
status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
;;
restart|force-reload)
log_daemon_msg "Restarting $DESC" "$NAME"
do_stop
case "$?" in
0|1)
do_start
case "$?" in
0) log_end_msg 0 ;;
1) log_end_msg 1 ;;
*) log_end_msg 1 ;;
esac
;;
*)
# Failed to stop
log_end_msg 1
;;
esac
;;
*)
echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
exit 3
;;
esac
:
register the script
-------------------
.. code-block:: bash
update-rc.d punani defaults
service punani start
RHEL Init Script
================
.. code-block:: bash
#!/bin/bash
# `forked` (read stolen) from http://bitten.edgewall.org/wiki/BittenSlaveDaemonRedhat
#
# processname: punani
# config: /krebs/punani/config.json
# pidfile: /var/run/punani.pid
# chkconfig: 2345 99 01
# description: punani daemon
# Source function library.
. /etc/rc.d/init.d/functions
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="punani daemon"
NAME=punani
DAEMON=/usr/bin/python
DAEMON_ARGS="/krebs/punani/index.py"
DAEMON_USER=nobody
PIDFILE=/var/run/$NAME.pid
[ -x "$DAEMON" ] || exit 0
[ -r /etc/sysconfig/$NAME ] && . /etc/sysconfig/$NAME
start() {
echo -n $"Starting $NAME: "
daemon --user="$DAEMON_USER" --pidfile="$PIDFILE" "$DAEMON $DAEMON_ARGS &" # daemonize here
RETVAL=$?
pid=`ps -A | grep $NAME | cut -d" " -f2`
pid=`echo $pid | cut -d" " -f2`
if [ -n "$pid" ]; then
echo $pid > "$PIDFILE"
fi
echo
return $RETVAL
}
stop() {
echo -n $"Stopping $NAME: "
killproc -p "$PIDFILE" -d 10 "$DAEMON"
RETVAL="$?"
echo
[ $RETVAL = 0 ] && rm -f "$PIDFILE"
return "$RETVAL"
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
*)
echo "Usage: $NAME {start|stop|restart}" >&2
exit 1
;;
esac
exit $RETVAL
register RHEL init-config
-------------------------
.. code-block:: bash
chkconfig punani on
service punani start
|
