Nagios Not Functioning

[psd401]

We have Nagios Core v4.3.4. Lately when users apply configuration changes or add Hosts to Nagios the changes are not applied, when looking into the Nagios server itself we see that Nagios seems to be running as a service on our Linux system, but when doing an service Nagios status I see the following error:

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No lock file found in /usr/local/nagios/var/nagios.lock

I then did a vim /usr/local/nagios/etc/nagios.cfg and saw this for the lock file:

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lock_file=/var/run/nagios/nagios.pid

I was not sure if nagios.pid is correct for the lock file, but I also am not sure if perhaps this may be the root of the problem for Nagios to not function correctly. We are however able to access the web GUI. Any help on this would be appreciated!

[scottwilkerson]

You are going to want to edit the /usr/local/nagios/etc/nagios.cfg to use

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lock_file=/usr/local/nagios/var/nagios.lock

[psd401]

When doing the change for the lock_file it led to Nagios being unaccessible, with the same error of

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No lock file found in /usr/local/nagios/var/nagios.lock

existant as before. However when changing the lock_file back to lock_file=/var/run/nagios/nagios.pid it allows for the nagios service to work again but as the same error as before. Perhaps I am missing another configuration file?

[scottwilkerson]

Can you share your /etc/init.d/nagios file

Also, the output of the following command

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ls -l /var/run/nagios/nagios.pid

Thanks

[psd401]

Here is the output of /etc/init.d/nagios:

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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
# 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=/usr/local/nagios
exec_prefix=${prefix}
NagiosBin=${exec_prefix}/bin/nagios
NagiosCfgFile=${prefix}/etc/nagios.cfg
NagiosCfgtestFile=${prefix}/var/nagios.configtest
NagiosStatusFile=${prefix}/var/status.dat
NagiosRetentionFile=${prefix}/var/retention.dat
NagiosCommandFile=${prefix}/var/rw/nagios.cmd
NagiosVarDir=${prefix}/var
NagiosRunFile=${prefix}/var/nagios.lock
NagiosLockDir=/var/lock/subsys
NagiosLockFile=nagios
NagiosCGIDir=${exec_prefix}/sbin
NagiosUser=nagios
NagiosGroup=nagios
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 -R $NagiosUser:$NagiosGroup ${RAMDISK_DIR}
	fi
fi


check_config ()
{
	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
		chmod 0644 $NagiosCfgtestFile
		chown $NagiosUser:$NagiosGroup $NagiosCfgtestFile
		/bin/rm "$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
		chmod 0644 $NagiosCfgtestFile
		chown $NagiosUser:$NagiosGroup $NagiosCfgtestFile
		/bin/rm "$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
		chmod 0644 $NagiosCfgtestFile
		chown $NagiosUser:$NagiosGroup $NagiosCfgtestFile
		cat "$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`
}



# 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

		touch $NagiosVarDir/nagios.log $NagiosRetentionFile
		rm -f $NagiosCommandFile
		touch $NagiosRunFile
		chown $NagiosUser:$NagiosGroup $NagiosRunFile $NagiosVarDir/nagios.log $NagiosRetentionFile
		$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 2 3 4 5 6 7 8 9 10 ; 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'
		else
			echo ' done.'
		fi

		rm -f $NagiosStatusFile $NagiosRunFile $NagiosLockDir/$NagiosLockFile $NagiosCommandFile
		;;

	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

This is the output of ls -l /var/run/nagios/nagios.pid

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-rw-r--r--. 1 nagios nagios 5 Nov 28 11:08 /var/run/nagios/nagios.pid

[scottwilkerson]

In that file change this line

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NagiosRunFile=${prefix}/var/nagios.lock

to this

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NagiosRunFile=/var/run/nagios/nagios.pid

Then they will match (which is required) if you had already change the one in the nagios.cfg back.

[psd401]

That seemed to fix it! Once I restarted Nagios, I tested a random config file and saw the web GUI pick it up instantly. Thank you for the quick help!

[scottwilkerson]

That seemed to fix it! Once I restarted Nagios, I tested a random config file and saw the web GUI pick it up instantly. Thank you for the quick help!

Great! Glad to hear it is resolved!

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