Installation et configuration de Nagios pour débutants

supervision:~ # groupadd nagios

supervision:~ # useradd -m -G nagios nagios

supervision:~ # useradd -m -g nagios nagios

supervision:~ # passwd nagios

supervision:~ # groupadd nagcmd
supervision:~ # usermod -G nagcmd nagios
supervision:~ # usermod -G nagcmd wwwrun

supervision:~ # groupadd nagcmd
supervision:~ # usermod -g nagcmd nagios
supervision:~ # usermod -g nagcmd www-data

root@supervision:~# mkdir -p /nagios/download
root@supervision:~# cd /nagios/download
root@supervision:/nagios/download# wget https://sourceforge.net/projects/nagios/files/nagios-4.x/nagios-4.4.5/nagios-4.4.5.tar.gz
root@supervision:/nagios/download# wget http://www.nagios-plugins.org/download/nagios-plugins-2.3.1.tar.gz
root@supervision:/nagios/download# ls -alh
total 4,0M
drwxr-xr-x 2 root root 4,0K oct.  15 11:47 .
drwxr-xr-x 3 root root 4,0K oct.  15 11:45 ..
-rw-r--r-- 1 root root 1,8M août 12 2014 nagios-4.4.5.tar.gz
-rw-r--r-- 1 root root 2,4M oct.   2 17:27 nagios-plugins-2.3.1.tar.gz

supervision: # cd /nagios/download/
root@supervision:/nagios/download# tar -xzf nagios-4.4.5.tar.gz

supervision:/nagios/download # cd nagios-4.4.5/
supervision:/nagios/download/nagios # ./configure --with-command-group=nagcmd

supervision:/nagios/download/nagios-4.4.5 #  make all

supervision:/nagios/download/nagios-4.4.5 # make install

root@supervision:/nagios/download/nagios-4.4.5# make install-init
/usr/bin/install -c -m 755 -d -o root -g root /etc/init.d
/usr/bin/install -c -m 755 -o root -g root daemon-init /etc/init.d/nagios

*** Init script installed ***

sous Debian 7.x

root@supervision:/nagios/download/nagios-4.4.5# update-rc.d nagios defaults

ou sous Debian 8.x
root@supervision:/nagios/download/nagios-4.4.5# update-rc.d nagios defaults

root@supervision:/nagios/download/nagios-4.4.5# make install-config
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc/objects
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/nagios.cfg /usr/local/nagios/etc/nagios.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/cgi.cfg /usr/local/nagios/etc/cgi.cfg
/usr/bin/install -c -b -m 660 -o nagios -g nagios sample-config/resource.cfg /usr/local/nagios/etc/resource.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/templates.cfg /usr/local/nagios/etc/objects/templates.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/commands.cfg /usr/local/nagios/etc/objects/commands.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/contacts.cfg /usr/local/nagios/etc/objects/contacts.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/timeperiods.cfg /usr/local/nagios/etc/objects/timeperiods.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/localhost.cfg /usr/local/nagios/etc/objects/localhost.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/windows.cfg /usr/local/nagios/etc/objects/windows.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/printer.cfg /usr/local/nagios/etc/objects/printer.cfg
/usr/bin/install -c -b -m 664 -o nagios -g nagios sample-config/template-object/switch.cfg /usr/local/nagios/etc/objects/switch.cfg

*** Config files installed ***

Remember, these are *SAMPLE* config files.  You'll need to read
the documentation for more information on how to actually define
services, hosts, etc. to fit your particular needs.

root@supervision:/nagios/download/nagios-4.4.5# make install-commandmode
/usr/bin/install -c -m 775 -o nagios -g nagcmd -d /usr/local/nagios/var/rw
chmod g+s /usr/local/nagios/var/rw

*** External command directory configured ***

root@supervision:/nagios/download/nagios-4.4.5# vi /usr/local/nagios/etc/objects/contacts.cfg 

###############################################################################
# CONTACTS.CFG - SAMPLE CONTACT/CONTACTGROUP DEFINITIONS
#
# Last Modified: 05-31-2007
#
# NOTES: This config file provides you with some example contact and contact
#        group definitions that you can reference in host and service
#        definitions.
#       
#        You don't need to keep these definitions in a separate file from your
#        other object definitions.  This has been done just to make things
#        easier to understand.
#
###############################################################################



###############################################################################
###############################################################################
#
# CONTACTS
#
###############################################################################
###############################################################################

# Just one contact defined by default - the Nagios admin (that's you)
# This contact definition inherits a lot of default values from the 'generic-contact' 
# template which is defined elsewhere.

define contact{
       contact_name  nagiosadmin                   ; Short name of user
       use             generic-contact           ; Inherit default values from generic-contact template (defined above)
       alias         Administrateur Nagios         ; Full name of user
       email         toto@tutu.fr  ; Adresse Email pour les notifications
       }



###############################################################################
###############################################################################
#
# CONTACT GROUPS
#
###############################################################################
###############################################################################

# We only have one contact in this simple configuration file, so there is
# no need to create more than one contact group.

define contactgroup{
       contactgroup_name       admins
       alias                   Administrateurs Nagios
       members                 nagiosadmin
       }

root@supervision:/nagios/download/nagios-4.4.5# make install-webconf
/usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/conf.d/nagios.conf
if [ 0 -eq 1 ]; then \
        ln -s /etc/apache2/conf.d/nagios.conf /etc/apache2/sites-enabled/nagios.conf; \
fi

root@supervision:/nagios/download/nagios-4.4.5# a2enmod rewrite
root@supervision:/nagios/download/nagios-4.4.5# a2enmod a2enmod cgi

root@supervision:/nagios/download/nagios-4.4.5# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
New password:
Re-type new password:

root@supervision:/nagios/download/nagios-4.4.5# /etc/init.d/apache2 stop
[ OK ] Stopping apache2 (via systemctl): apache2.service.
root@supervision:/nagios/download/nagios-4.4.5# /etc/init.d/apache2 start
[ OK ] Starting apache2 (via systemctl): apache2.service.

Ou

service apache2 restart


ou

systemctl restart apache2.service

root@supervision:/nagios/download/nagios-4.4.5# cd /nagios/download/
root@supervision:/nagios/download# tar -xzf nagios-plugins-2.3.1.tar.gz
root@supervision:/nagios/download# cd nagios-plugins-2.3.1/
root@supervision:/nagios/download/nagios-plugins-2.3.1# ./configure --with-nagios-user=nagios --with-nagios-group=nagios

root@supervision:/nagios/download/nagios-plugins-2.3.1# make
root@supervision:/nagios/download/nagios-plugins-2.3.1# make install

root@supervision:/nagios/download/nagios-plugins-2.3.1# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Core 4.4.5
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 2019-08-20
License: GPL

Website: https://www.nagios.org
Reading configuration data...
   Read main config file okay...
   Read object config files okay...

Running pre-flight check on configuration data...

Checking objects...
        Checked 8 services.
        Checked 1 hosts.
        Checked 1 host groups.
        Checked 0 service groups.
        Checked 1 contacts.
        Checked 1 contact groups.
        Checked 24 commands.
        Checked 5 time periods.
        Checked 0 host escalations.
        Checked 0 service escalations.
Checking for circular paths...
        Checked 1 hosts
        Checked 0 service dependencies
        Checked 0 host dependencies
        Checked 5 timeperiods
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0
Total Errors:   0

Things look okay - No serious problems were detected during the pre-flight check

supervision:/nagios/download/nagios-plugins-2.3.1 # chkconfig --add apache2
supervision:/nagios/download/nagios-plugins-2.3.1 # chkconfig --add nagios
supervision:/nagios/download/nagios-plugins-2.3.1 # chkconfig nagios on
supervision:/nagios/download/nagios-plugins-2.3.1 # chkconfig apache2 on

# update-rc.d nagios defaults

root@supervision:/nagios/download/nagios-plugins-2.3.1# update-rc.d nagios defaults
update-rc.d: using dependency based boot sequencing
insserv: Script nagios is broken: incomplete LSB comment.
insserv: missing `Default-Start:'  entry: please add even if empty.
insserv: missing `Default-Stop:'   entry: please add even if empty.
insserv: Default-Start undefined, assuming empty start runlevel(s) for script `nagios'
insserv: Default-Stop  undefined, assuming empty stop  runlevel(s) for script `nagios'
root@supervision:/nagios/download/nagios-plugins-2.3.1#

# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6

#!/bin/sh

# Nagios        Startup script for the Nagios monitoring daemon
#
# chkconfig:    - 85 15
# description:  Nagios is a service monitoring system
# processname: nagios
# config: /etc/nagios/nagios.cfg
# pidfile: /var/nagios/nagios.pid
#
### BEGIN INIT INFO
# Provides:             nagios
# Required-Start:       $local_fs $syslog $network
# Required-Stop:        $local_fs $syslog $network
# Short-Description:    start and stop Nagios monitoring server
# Description:          Nagios is is a service monitoring system
### END INIT INFO

# Source function library.
. /etc/rc.d/init.d/functions

cp /etc/init.d/nagios /nagios/download/nagios.old

#!/bin/sh

# Nagios        Startup script for the Nagios monitoring daemon
#
# chkconfig:    - 85 15
# description:  Nagios is a service monitoring system
# processname: nagios
# config: /etc/nagios/nagios.cfg
# pidfile: /var/nagios/nagios.pid
#
### 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:    start and stop Nagios monitoring server
# Description:          Nagios is is a service monitoring system
### END INIT INFO

# Source function library.
. /etc/rc.d/init.d/functions

root@supervision:/nagios/download/nagios-plugins-2.3.1# update-rc.d nagios defaults
update-rc.d: using dependency based boot sequencing

root@supervision:/nagios/download/nagios-plugins-2.3.1# /etc/init.d/nagios start

root@supervision:/nagios/download/nagios-plugins-2.3.1# /etc/init.d/nagios start
/etc/init.d/nagios: 22: .: Can't open /etc/rc.d/init.d/functions

. /etc/rc.d/init.d/functions

# Source function library.
# . /etc/rc.d/init.d/functions
. /lib/lsb/init-functions

root@supervision:/nagios/download/nagios-plugins-2.3.1# /etc/init.d/nagios start
/etc/init.d/nagios: 119: /etc/init.d/nagios: status: not found
/etc/init.d/nagios: 76: test: false: unexpected operator
$Starting nagios: Invalid --user argument: 'd' (unknown user d)
usage: daemon [options] [--] [cmd arg...]
options:
...

/sbin/service nagios configtest > "$TMPFILE"

/usr/sbin/service nagios configtest > "$TMPFILE"

killproc -p ${pidfile} -d 10 $exec

killproc -p ${pidfile} $exec

$nice runuser -s /bin/bash - $user -c "$corelimit >/dev/null 2>&1 ; $exec -vp $config"

$nice su -s /bin/bash - nagios -c "$corelimit >/dev/null 2>&1 ; $exec -vp $config"

if test "$checkconfig" == "false"; then
…
daemon --user=$user $exec -ud $config

if test "$checkconfig" = "false"; then
…
daemon --user=$user -- $exec -d $config

lockfile=/var/lock/subsys/$prog

lockfile=/var/lock/$prog

#!/bin/sh

# Nagios   Startup script for the Nagios monitoring daemon
#
# chkconfig:   - 85 15
# description:   Nagios is a service monitoring system
# processname: nagios
# config: /etc/nagios/nagios.cfg
# pidfile: /var/nagios/nagios.pid
#
### 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:   start and stop Nagios monitoring server
# Description:      Nagios is is a service monitoring system
### END INIT INFO

# Source function library.
# . /etc/rc.d/init.d/functions
. /lib/lsb/init-functions

prefix="/usr/local/nagios"
exec_prefix="${prefix}"
exec="${exec_prefix}/bin/nagios"
prog="nagios"
config="${prefix}/etc/nagios.cfg"
pidfile="${prefix}/var/nagios.lock"
user="nagios"
group="nagios"
checkconfig="false"
ramdiskdir="/var/nagios/ramcache"

test -e /etc/sysconfig/$prog && . /etc/sysconfig/$prog

lockfile=/var/lock/$prog
USE_RAMDISK=${USE_RAMDISK:-0}

if test "$USE_RAMDISK" -ne 0 && test "$RAMDISK_SIZE"X != "X"; then
   ramdisk=`mount |grep "$ramdiskdir type tmpfs"`
   if [ "$ramdisk"X == "X" ]; then
  mkdir -p -m 0755 $ramdiskdir
  mount -t tmpfs -o size=${RAMDISK_SIZE}m tmpfs $ramdiskdir
  mkdir -p -m 0755 $ramdiskdir/checkresults
  chown -R $user:$group $ramdiskdir
   fi
fi

check_config() {
   TMPFILE="/tmp/.configtest.$$"
   /usr/sbin/service nagios configtest > "$TMPFILE"
   WARN=`grep ^"Total Warnings:" "$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" > /var/run/nagios.configtest
  chmod 0644 /var/run/nagios.configtest
  /bin/rm "$TMPFILE"
   return 0
   else
  # We'll write out the errors to a file we can have a
  # script watching for
  echo "WARNING: Errors in config files - see log for details: $TMPFILE" > /var/run/nagios.configtest
  egrep -i "(^warning|^error)" "$TMPFILE" >> /var/run/nagios.configtest
  chmod 0644 /var/run/nagios.configtest
  cat "$TMPFILE"
   exit 8
   fi
}

start() {
   test -x $exec || exit 5
   test -f $config || exit 6
   if test "$checkconfig" = "false"; then
  check_config
   fi
   echo -n $"Starting $prog: "
   # We need to _make sure_ the precache is there and verified
   # Raise priority to make it run better
   daemon --user=$user -- $exec -d $config
   retval=$?
   echo
   test $retval -eq 0 && touch $lockfile
   return $retval
}

stop() {
   echo -n $"Stopping $prog: "
   killproc -p ${pidfile}  $exec
   retval=$?
   echo
   test $retval -eq 0 && rm -f $lockfile
   return $retval
}


restart() {
   check_config
   checkconfig="true"
   stop
   start
}

reload() {
   echo -n $"Reloading $prog: "
   killproc -p ${pidfile} $exec -HUP
   RETVAL=$?
   echo
}

force_reload() {
   restart
}

case "$1" in
   start)
  status_of_proc $prog && exit 0
  $1
  ;;
   stop)
  status_of_proc $prog|| exit 0
  $1
  ;;
   restart)
  $1
  ;;
   reload)
  status_of_proc $prog || exit 7
  $1
  ;;
   force-reload)
  force_reload
  ;;
   status)
  status_of_proc $prog
  ;;
   condrestart|try-restart)
  status_of_proc $prog|| exit 0
  restart
  ;;
   configtest)
  $nice su -s /bin/bash - nagios -c "$corelimit >/dev/null 2>&1 ; $exec -vp $config"
  RETVAL=$?
  ;;
   *)
  echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"
  exit 2
esac
exit $?

root@supervision:# /etc/init.d/nagios stop
[ OK ] is running.
$Stopping nagios:
root@supervision:# ps -aux | grep nagios
warning: bad ps syntax, perhaps a bogus '-'?
See http://gitorious.org/procps/procps/blobs/master/Documentation/FAQ
root      3541  0.0  0.0   3564   788 pts/0    S+   13:17   0:00 grep nagios
root@supervision:# /etc/init.d/nagios stop
[FAIL] is not running ... failed!
root@supervision:# /etc/init.d/nagios start
[FAIL] is not running ... failed!
$Starting nagios:
root@supervision:# ps -aux | grep nagios
warning: bad ps syntax, perhaps a bogus '-'?
See http://gitorious.org/procps/procps/blobs/master/Documentation/FAQ
nagios    3630  0.0  0.1   7304  1136 ?        Ss   13:18   0:00 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
nagios    3631  0.0  0.0   2672   588 ?        S    13:18   0:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios    3632  0.0  0.0   2672   588 ?        S    13:18   0:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios    3633  0.0  0.0   2672   588 ?        S    13:18   0:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios    3634  0.0  0.0   2672   580 ?        S    13:18   0:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios    3635  0.0  0.0   6928   400 ?        S    13:18   0:00 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
root      3637  0.0  0.0   3564   792 pts/0    S+   13:18   0:00 grep nagios
root@supervision:# /etc/init.d/nagios status
[ OK ] is running.
root@supervision:#

root@supervision:/nagios/download/nagios-plugins-2.3.1# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

root@supervision:/nagios/download/nagios-plugins-2.3.1# /etc/init.d/nagios stop; pkill nagios; /etc/init.d/nagios start

supervision:/nagios/download/nagios-plugins-2.3.1 # chown nagios.nagcmd /usr/local/nagios/var/rw

iptables -I INPUT -p tcp --destination-port 80 -j ACCEPT
apt-get install -y iptables-persistent

check_command                   check_local_disk!20%!10%!/

# 'check_local_disk' command definition
define command{
       command_name    check_local_disk
       command_line    $USER1$/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$ -u $ARG4$
       }

supervision:~ # /usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
DISK OK - free space: / 137429 MB (97% inode=98%);| /=3734MB;118974;133846;0;148718
supervision:~ # echo $?
0

supervision:~ # /usr/local/nagios/libexec/check_disk -w 20% -c 10% -p / -u GB
DISK OK - free space: / 134 GB (97% inode=98%);| /=3GB;116;130;0;145

supervision:~ # cat /usr/local/nagios/etc/objects/commands.cfg | grep check_disk
       command_line    $USER1$/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$ -u $ARG4$
supervision:~ # cat /usr/local/nagios/etc/objects/localhost.cfg | grep check_local_disk
       check_command                   check_local_disk!20%!10%!/!GB

# find / -name libssl.so*
/usr/lib64/libssl.so.0.9.8
/usr/lib/libssl.so.0.9.8

# cd /tmp
# wget https://djibril.developpez.com/tutoriels/linux/nagios-pour-debutant/fichiers/zlib-devel-1.2.3-106.34.x86_64.rpm
# wget https://djibril.developpez.com/tutoriels/linux/nagios-pour-debutant/fichiers/libopenssl-devel-0.9.8j-0.26.1.x86_64.rpm
# rpm -ivh zlib-devel-1.2.3-106.34.x86_64.rpm
# rpm -ivh libopenssl-devel-0.9.8j-0.26.1.x86_64.rpm
# find / -name libssl.so*
/usr/lib64/libssl.so
/usr/lib64/libssl.so.0.9.8
/usr/lib/libssl.so.0.9.8