Service that uses libcurl not auto-starting on Debian? - linux

Question

I've written and compiled a daemon program in C which is meant to run in the background with root access. My program uses libcurl to make some occasional network calls. I've also written a simple init.d script to govern its startup and shutdown procedures. I would like this service to automatically start on boot, and based on what I've done I would expect it to already be doing this. However, I'm noticing an error in the logs relating to libcurl, and as a result the service is not being started automatically.
My program is located in /usr/bin/myprog and I have the following bash script located in /etc/init.d/myprog:
#!/bin/bash
### BEGIN INIT INFO
# Provides: myprog
# Required-Start: $remote_fs $network $syslog
# Required-Stop: $remote_fs $network $syslog
# Default-Start: 3 4 5
# Default-Stop: 0 1 2 6
# Short-Description: myprog
# Description: My Daemon Program
### END INIT INFO
. /lib/lsb/init-functions
SCRIPT=/usr/bin/myprog
PIDFILE=/var/run/myprog.pid
start() {
if [ -f $PIDFILE ]; then
echo "Service is already started"
return 2
else
$SCRIPT
$RETVAL="$?"
return "${RETVAL}"
fi
}
stop() {
if [ -f $PIDFILE ]; then
kill $(cat $PIDFILE)
rm -f $PIDFILE
return 0
else
echo "Service is not running"
return 2
fi
}
case "$1" in
start)
log_daemon_msg "Starting myprog" "myprog"
start
;;
stop)
log_daemon_msg "Stopping myprog" "myprog"
stop
;;
status)
status_of_proce "$SCRIPT" "myprog" && exit 0 || exit $?
;;
restart)
log_daemon_msg "Restarting myprog" "myprog"
stop
start
;;
*)
echo $"Usage: $0 {start|stop|status|restart}" >&2
exit 3
;;
esac
I then ran sudo update-rc.d myprog defaults and this created the following files:
/etc/rc0.d/K01myprog
/etc/rc1.d/K01myprog
/etc/rc2.d/K01myprog
/etc/rc3.d/S02myprog
/etc/rc4.d/S02myprog
/etc/rc5.d/S02myprog
/etc/rc6.d/K01myprog
And as far as I can tell, each of those 7 files are identical copies of the one I posted above. Based on the various tutorials and forums I've been reading, I would think this would be sufficient. However, my service does not appear to be auto-starting on boot. If I call sudo /etc/init.d/myprog start directly, then it starts up fine. But otherwise it does not appear to be launched.
I then noticed an error message in the logs which said "curl error: could not resolve host," even though the particular host it was referencing was definitely valid. So I think perhaps it's trying to launch my application before something that libcurl needs is ready, and is therefore failing to launch. Again, if I launch it manually it works fine. How can I fix this?

Answer 1

If DNS resolution is the point of failure then use the IP address instead. If you are unwilling to use the IP address, add the hostname and IP address to /etc/hosts.