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nagios4/daemon-init.in

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#!/bin/sh
#
# chkconfig: 345 99 01
# description: Nagios network monitor
# processname: nagios
# File : nagios
#
# Author : Jorge Sanchez Aymar (jsanchez@lanchile.cl)
#
# Changelog :
#
# 1999-07-09 Karl DeBisschop <kdebisschop@infoplease.com>
# - setup for autoconf
# - add reload function
# 1999-08-06 Ethan Galstad <egalstad@nagios.org>
# - Added configuration info for use with RedHat's chkconfig tool
# per Fran Boon's suggestion
# 1999-08-13 Jim Popovitch <jimpop@rocketship.com>
# - added variable for nagios/var directory
# - cd into nagios/var directory before creating tmp files on startup
# 1999-08-16 Ethan Galstad <egalstad@nagios.org>
# - Added test for rc.d directory as suggested by Karl DeBisschop
# 2000-07-23 Karl DeBisschop <kdebisschop@users.sourceforge.net>
# - Clean out redhat macros and other dependencies
# 2003-01-11 Ethan Galstad <egalstad@nagios.org>
# - Updated su syntax (Gary Miller)
#
# Description: Starts and stops the Nagios monitor
# used to provide network services status.
#
### BEGIN INIT INFO
# Provides: nagios
# Required-Start: $local_fs $syslog $network
# Required-Stop: $local_fs $syslog $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Starts and stops the Nagios monitoring server
# Description: Starts and stops the Nagios monitoring server
### END INIT INFO
# Our install-time configuration.
prefix=@prefix@
exec_prefix=@exec_prefix@
NagiosBin=@bindir@/nagios
NagiosCfgFile=@sysconfdir@/nagios.cfg
NagiosCfgtestFile=@localstatedir@/nagios.configtest
NagiosStatusFile=@localstatedir@/status.dat
NagiosRetentionFile=@localstatedir@/retention.dat
NagiosCommandFile=@localstatedir@/rw/nagios.cmd
NagiosVarDir=@localstatedir@
NagiosRunFile=@lockfile@
NagiosLockDir=/var/lock/subsys
NagiosLockFile=nagios
NagiosCGIDir=@sbindir@
NagiosUser=@nagios_user@
NagiosGroup=@nagios_grp@
checkconfig="true"
# Source function library
# Some *nix do not have an rc.d directory, so do a test first
if [ -f /etc/rc.d/init.d/functions ]; then
. /etc/rc.d/init.d/functions
elif [ -f /etc/init.d/functions ]; then
. /etc/init.d/functions
elif [ -f /lib/lsb/init-functions ]; then
. /lib/lsb/init-functions
fi
# Load any extra environment variables for Nagios and its plugins.
if test -f /etc/sysconfig/nagios; then
. /etc/sysconfig/nagios
fi
# Automate addition of RAMDISK based on environment variables
USE_RAMDISK=${USE_RAMDISK:-0}
if test "$USE_RAMDISK" -ne 0 && test "$RAMDISK_SIZE"X != "X"; then
ramdisk=`mount |grep "${RAMDISK_DIR} type tmpfs"`
if [ "$ramdisk"X == "X" ]; then
mkdir -p -m 0755 ${RAMDISK_DIR}
mount -t tmpfs -o size=${RAMDISK_SIZE}m tmpfs ${RAMDISK_DIR}
mkdir -p -m 0755 ${RAMDISK_DIR}/checkresults
chown -h -R $NagiosUser:$NagiosGroup ${RAMDISK_DIR}
fi
fi
check_config ()
{
rm -f "$NagiosCfgtestFile";
if test -e "$NagiosCfgtestFile"; then
echo "ERROR: Could not delete '$NagiosCfgtestFile'"
exit 8
fi
if ! su $NagiosUser -c "touch $NagiosCfgtestFile"; then
echo "ERROR: Could not create or update '$NagiosCfgtestFile'"
exit 8
fi
TMPFILE=$(mktemp /tmp/.configtest.XXXXXXXX)
$NagiosBin -vp $NagiosCfgFile > "$TMPFILE"
WARN=`grep ^"Total Warnings:" "$TMPFILE" |awk -F: '{print \$2}' |sed s/' '//g`
ERR=`grep ^"Total Errors:" "$TMPFILE" |awk -F: '{print \$2}' |sed s/' '//g`
if test "$WARN" = "0" && test "${ERR}" = "0"; then
echo "OK - Configuration check verified" > $NagiosCfgtestFile
/bin/rm "$TMPFILE"
return 0
elif test "${ERR}" = "0"; then
# Write the errors to a file we can have a script watching for.
echo "WARNING: Warnings in config files - see log for details: $NagiosCfgtestFile" > $NagiosCfgtestFile
egrep -i "(^warning|^error)" "$TMPFILE" >> $NagiosCfgtestFile
/bin/rm "$TMPFILE"
return 0
else
# Write the errors to a file we can have a script watching for.
echo "ERROR: Errors in config files - see log for details: $NagiosCfgtestFile" > $NagiosCfgtestFile
egrep -i "(^warning|^error)" "$TMPFILE" >> $NagiosCfgtestFile
cat "$TMPFILE"
exit 8
fi
}
status_nagios ()
{
if test -x $NagiosCGI/daemonchk.cgi; then
if $NagiosCGI/daemonchk.cgi -l $NagiosRunFile > /dev/null 2>&1; then return 0; fi
else
if ps -p $NagiosPID > /dev/null 2>&1; then return 0; fi
fi
return 1
}
printstatus_nagios ()
{
if status_nagios; then
echo "nagios (pid $NagiosPID) is running..."
else
echo "nagios is not running"
fi
}
killproc_nagios ()
{
kill -s "$1" $NagiosPID
}
pid_nagios ()
{
if test ! -f $NagiosRunFile; then
echo "No lock file found in $NagiosRunFile"
exit 1
fi
NagiosPID=`head -n 1 $NagiosRunFile`
}
remove_commandfile ()
{
# Removing a stalled command file, while there are processes trying/waiting to write into it,
# will deadlock those processes in a blocking open() system call. To allow such processes to
# die on a broken pipe, the pipe must be opened for reading without actually reading from it,
# which is what dd does here. To avoid a chicken-egg problem, the pipe is renamed beforehand.
# In order for the dd to not deadlock when there is no writing process, it is executed in the
# background in a subshell together with an empty echo to have at least one writing process.
# see http://unix.stackexchange.com/questions/335406/opening-named-pipe-blocks-forever-if-pipe-is-deleted-without-being-connected
if [ -p $NagiosCommandFile ]; then
mv -f $NagiosCommandFile $NagiosCommandFile~
(dd if=$NagiosCommandFile~ count=0 2>/dev/null & echo -n "" >$NagiosCommandFile~)
fi
rm -f $NagiosCommandFile $NagiosCommandFile~
}
# Check that nagios exists.
if [ ! -f $NagiosBin ]; then
echo "Executable file $NagiosBin not found. Exiting."
exit 1
fi
# Check that nagios.cfg exists.
if [ ! -f $NagiosCfgFile ]; then
echo "Configuration file $NagiosCfgFile not found. Exiting."
exit 1
fi
# See how we were called.
case "$1" in
start)
echo -n "Starting nagios:"
if test "$checkconfig" = "true"; then
check_config
# check_config exits on configuration errors.
fi
if test -f $NagiosRunFile; then
NagiosPID=`head -n 1 $NagiosRunFile`
if status_nagios; then
echo " another instance of nagios is already running."
exit 0
fi
fi
su $NagiosUser -c "touch $NagiosVarDir/nagios.log $NagiosRetentionFile"
remove_commandfile
touch $NagiosRunFile
$NagiosBin -d $NagiosCfgFile
if [ -d $NagiosLockDir ]; then touch $NagiosLockDir/$NagiosLockFile; fi
echo " done."
;;
stop)
echo -n "Stopping nagios:"
pid_nagios
killproc_nagios TERM
# now we have to wait for nagios to exit and remove its
# own NagiosRunFile, otherwise a following "start" could
# happen, and then the exiting nagios will remove the
# new NagiosRunFile, allowing multiple nagios daemons
# to (sooner or later) run - John Sellens
#echo -n 'Waiting for nagios to exit .'
for i in {1..90}; do
if status_nagios > /dev/null; then
echo -n '.'
sleep 1
else
break
fi
done
if status_nagios > /dev/null; then
echo ''
echo 'Warning - nagios did not exit in a timely manner - Killing it!'
killproc_nagios KILL
else
echo ' done.'
fi
remove_commandfile
rm -f $NagiosStatusFile $NagiosRunFile $NagiosLockDir/$NagiosLockFile
;;
status)
pid_nagios
printstatus_nagios
;;
checkconfig)
if test "$checkconfig" = "true"; then
printf "Running configuration check...\n"
check_config
fi
if [ $? -eq 0 ]; then
echo " OK."
else
echo " CONFIG ERROR! Check your Nagios configuration."
exit 1
fi
;;
restart)
if test "$checkconfig" = "true"; then
printf "Running configuration check...\n"
check_config
fi
$0 stop
$0 start
;;
reload|force-reload)
if test "$checkconfig" = "true"; then
printf "Running configuration check...\n"
check_config
fi
if test ! -f $NagiosRunFile; then
$0 start
else
pid_nagios
if status_nagios > /dev/null; then
printf "Reloading nagios configuration...\n"
killproc_nagios HUP
echo "done"
else
$0 stop
$0 start
fi
fi
;;
configtest)
$NagiosBin -vp $NagiosCfgFile
;;
*)
echo "Usage: nagios {start|stop|restart|reload|force-reload|status|checkconfig|configtest}"
exit 1
;;
esac
# End of this script
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