I recently moved a home-grown service I had running on a virtual machine (Debian 7.8) to a physical computer (Debian 8.5) and after the move, my init script stopped working. I understand there were some major changes to the init process etc. between Wheezy and Jessie, but so far as I can tell, the changes should still be compatible with my init script. I'm pretty sure I 'LSBized' the script per the directions on the Debian Wiki and stayed pretty close to the old skeleton example anyway.
I did a lot of bumping around, trying to figure out what was going on and I'm pretty sure that the script (usually?) is crashing - or at least stopping - while sourcing the functions at /lib/lsb/init-functions. I have no idea why that would happen.
After coming to this conclusion, I trimmed down the init script to a (pretty clumsy) shorter version that does not use the init-functions; it just forks a bash process into a sub-sub shell so it will be orphaned. That seems to work a bit better but it still has occasional issues with the new services set-up. I'm less interested in fixing this duct-tape-and-bailing-wire solution as I am figuring out why my more standard init script is misbehaved.
Any ideas?
Here's my old init script:
#! /bin/sh
### BEGIN INIT INFO
# Provides: myd
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Initscript for myService daemon
### END INIT INFO
# Do NOT "set -e"
# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="myService daemon"
NAME=myd
DAEMON=/home/uname/myService/bin/$NAME
DAEMON_ARGS=""
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0
# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions
#
# Function that starts the daemon/service
#
do_start()
{
# Return
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
start-stop-daemon --start --quiet \
--background \
--pidfile $PIDFILE \
--make-pidfile \
--user uname \
--chuid uname \
--startas /bin/bash \
--test \
-- -c "exec $DAEMON >> /.myd/var/init.log 2>&1" \
|| return 1
start-stop-daemon --start --quiet \
--background \
--pidfile $PIDFILE \
--make-pidfile \
--user uname \
--chuid uname \
--startas /bin/bash \
-- -c "exec $DAEMON >> /home/uname/.myd/var/init.log 2>&1" \
|| return 2
# Add code here, if necessary, that waits for the process to be ready
# to handle requests from services started subsequently which depend
# on this one. As a last resort, sleep for some time.
return 0
}
#
# Function that stops the daemon/service
#
do_stop()
{
# Return
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
# other if a failure occurred
start-stop-daemon --stop --quiet \
--retry=TERM/30/KILL/5 \
--pidfile $PIDFILE \
--name $NAME
RETVAL="$?"
[ "$RETVAL" = 2 ] && return 2
# Wait for children to finish too if this is a daemon that forks
# and if the daemon is only ever run from this initscript.
# If the above conditions are not satisfied then add some other code
# that waits for the process to drop all resources that could be
# needed by services started subsequently. A last resort is to
# sleep for some time.
start-stop-daemon --stop --quiet --oknodo \
--retry=0/30/KILL/5 \
--exec $DAEMON
[ "$?" = 2 ] && return 2
# Many daemons don't delete their pidfiles when they exit.
rm -f $PIDFILE
return "$RETVAL"
}
#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
#
# If the daemon can reload its configuration without
# restarting (for example, when it is sent a SIGHUP),
# then implement that here.
#
start-stop-daemon --stop --signal 1 --quiet \
--pidfile $PIDFILE \
--name $NAME
return 0
}
case "$1" in
start)
log_daemon_msg "Starting $DESC" "$NAME"
do_start
case "$?" in
0|1) log_end_msg 0
;;
2) log_end_msg 1
;;
esac
;;
stop)
log_daemon_msg "Stopping $DESC" "$NAME"
do_stop
case "$?" in
0|1) log_end_msg 0
;;
2) log_end_msg 1
;;
esac
;;
status)
status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
;;
#reload|force-reload)
#
# If do_reload() is not implemented then leave this commented out
# and leave 'force-reload' as an alias for 'restart'.
#
#log_daemon_msg "Reloading $DESC" "$NAME"
#do_reload
#log_end_msg $?
#;;
restart|force-reload)
#
# If the "reload" option is implemented then remove the
# 'force-reload' alias
#
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 ;; # Old process is still running
*) log_end_msg 1 ;; # Failed to start
esac
;;
*)
# Failed to stop
log_end_msg 1
;;
esac
;;
*)
#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
exit 3
;;
esac
:
And my new (clumsy) script that (mostly) works:
#! /bin/sh
### BEGIN INIT INFO
# Provides: myd
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Initscript for myService daemon
### END INIT INFO
# Do NOT "set -e"
# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="myService daemon"
NAME=myd
DAEMON=/home/uname/myService/bin/$NAME
DAEMON_ARGS=""
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0
#
# Function that starts the daemon/service
#
do_start()
{
(
runuser -l uname "$DAEMON" >/dev/null 2>&1 &
echo "$!" > "$PIDFILE"
)
return 0
}
#
# Function that stops the daemon/service
#
do_stop()
{
PID="$(cat $PIDFILE)"
kill "$PID" >/dev/null 2>&1
#Give myd 5 seconds for an orderly shutdown
for i in $(seq 1 5); do
sleep 1
if [ ! kill -0 "$PID" >/dev/null 2>&1 ]; then
rm "$PIDFILE"
return 0;
fi
done
#No more playing nice: KILL THE DAEMON
if [ kill -0 "$PID" >/dev/null 2>&1 ]; then
echo "Orderly shutdown failed, sending kill signal"
kill -9 "$PID" >/dev/null 2>&1
fi
#Give myd 5 more seconds then fail
for i in $(seq 1 5); do
sleep 1
if [ ! kill -0 "$PID" >/dev/null 2>&1 ]; then
rm "$PIDFILE"
return 0;
fi
done
#FAILED
echo "Failed to kill $DESC $NAME"
return 1
}
case "$1" in
start)
echo "Starting $DESC $NAME" >&2
do_start
;;
stop)
echo "Stopping $DESC $NAME" >&2
do_stop
;;
restart|force-reload)
#
# If the "reload" option is implemented then remove the
# 'force-reload' alias
#
echo "Restarting $DESC $NAME" >&2
do_stop
do_start
;;
*)
#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
exit 3
;;
esac
:
As an aside, after much googling and head-scratching, I'm still not very aware of the new system for dependency booting etc. Can somebody point me in the direction of some (current) documentation for this stuff so I can self educate a little better? I hate being in the dark about the systems I'm working with.
Thanks!
