Using this guide, you can install the latest Check_MK and Nagios version.

Prerequisites

• RepoForge repository
• EPEL repository
• Disable SELinux. Normally i would SELinux be enabled, but a monitoring system is one of the few exceptions i make. The server does too many things SELinux doesn't like.

• Install rrdtool 1.4

  yum --enablerepo=repoforge install rrdtool
  
  # or install manually
  
  yum localinstall rrdtool-1.4.7-1.el6.rfx.x86_64.rpm  perl-rrdtool-1.4.7-1.el6.rfx.x86_64.rpm

• Install development tools.

  yum groupinstall development tools

• Install apache & php.

  yum install httpd php

• Install other requirements.

  yum install gd gd-devel php-gd openssl-devel net-snmp net-snmp-utils policycoreutils-python dejavu-fonts-common dejavu-sans-mono-fonts dejavu-lgc-sans-mono-fonts

• Create user and group.

  useradd nagios
  groupadd nagcmd
  usermod -a -G nagcmd nagios
  usermod -G nagcmd apache

• Download latest version

  wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.7.tar.gz

• Extract.

  tar zxvf nagios-4.0.7.tar.gz

• Compile Nagios 4.

  cd nagios-4.0.7
  ./configure --with-command-group=nagcmd --prefix=/opt/nagios --exec-prefix=/opt/nagios
  make all
  make install
  make install-init
  make install-config
  make install-commandmode
  make install-webconf
  cp -R contrib/eventhandlers/ /opt/nagios/libexec/
  chown -R nagios:nagios /opt/nagios/libexec/eventhandlers
  /opt/nagios/bin/nagios -v /opt/nagios/etc/nagios.cfg
  service nagios start

• Edit /opt/nagios/etc/resource.cfg

  $USER1$=/opt/nagios-plugins/libexec

• Add a default user for Web Interface Access

  htpasswd -c /opt/nagios/etc/htpasswd.users nagiosadmin

• Download Nagios plugins

  cd
  wget http://nagios-plugins.org/download/nagios-plugins-2.0.2.tar.gz

• Nagios Plugin Installation.

  tar zxvf nagios-plugins-2.0.2.tar.gz
  cd /tmp/nagios-plugins-2.0.2
  ./configure --with-nagios-user=nagios --with-nagios-group=nagios --prefix=/opt/nagios-plugins --exec-prefix=/opt/nagios-plugins
  make
  make install

• Service setup.

  chkconfig --add nagios
  chkconfig --level 35 nagios on
  chkconfig --add httpd
  chkconfig --level 35 httpd on

• Open port 80. Edit /etc/sysconfig/iptables add:

  -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

• Restart iptables

  service iptables restart

• Give the Nagios localhost http check something.

  touch /var/www/html/index.html

• Start Apache, Nagios should be running on your webserver /nagios

  service httpd start

• Download PNP4nagios.

  wget https://sourceforge.net/projects/pnp4nagios/files/latest

• Extract.

  tar zxvf pnp4nagios.tgz

• Compile.

  cd pnp4nagios-0.6.22
  ./configure --prefix=/opt/pnp4nagios --exec-prefix=/opt/pnp4nagios
  make all
  make fullinstall

• Configure apache, edit /etc/httpd/conf.d/pnp4nagios.conf

  AuthUserFile /opt/nagios/etc/htpasswd.users

• Restart apache.

  service httpd restart

• Configure Nagios to use PNP4nagios. Edit /opt/nagios/etc/nagios.cfg.

  #
  # Bulk / NPCD mode
  #
  
  process_performance_data=1
  
  # *** the template definition differs from the one in the original nagios.cfg
  #
  service_perfdata_file=/opt/pnp4nagios/var/service-perfdata
  service_perfdata_file_template=DATATYPE::SERVICEPERFDATA\tTIMET::$TIMET$\tHOSTNAME::$HOSTNAME$\tSERVICEDESC::$SERVICEDESC$\tSERVICEPERFDATA::$SERVICEPERFDATA$\tSERVICECHECKCOMMAND::$SERVICECHECKCOMMAND$\tHOSTSTATE::$HOSTSTATE$\tHOSTSTATETYPE::$HOSTSTATETYPE$\tSERVICESTATE::$SERVICESTATE$\tSERVICESTATETYPE::$SERVICESTATETYPE$
  service_perfdata_file_mode=a
  service_perfdata_file_processing_interval=15
  service_perfdata_file_processing_command=process-service-perfdata-file
  
  # *** the template definition differs from the one in the original nagios.cfg
  #
  host_perfdata_file=/opt/pnp4nagios/var/host-perfdata
  host_perfdata_file_template=DATATYPE::HOSTPERFDATA\tTIMET::$TIMET$\tHOSTNAME::$HOSTNAME$\tHOSTPERFDATA::$HOSTPERFDATA$\tHOSTCHECKCOMMAND::$HOSTCHECKCOMMAND$\tHOSTSTATE::$HOSTSTATE$\tHOSTSTATETYPE::$HOSTSTATETYPE$
  host_perfdata_file_mode=a
  host_perfdata_file_processing_interval=15
  host_perfdata_file_processing_command=process-host-perfdata-file

• Edit /opt/nagios/etc/objects/commands.cfg Disable sample performance data commands, add:

  #
  # Bulk mode
  #
  define command {
         command_name    process-service-perfdata-file
         command_line    /opt/pnp4nagios/libexec/process_perfdata.pl --bulk /opt/pnp4nagios/var/service-perfdata
  }
  define command {
         command_name    process-host-perfdata-file
         command_line    /opt/pnp4nagios/libexec/process_perfdata.pl --bulk /opt/pnp4nagios/var/host-perfdata
  }

• Remove install file.

  rm /opt/pnp4nagios/share/install.php

• Restart nagios.

  service nagios restart

• Open /pnp4nagios on your webserver.

• Install xinetd.

  yum install xinetd
  service xinetd start
  chkconfig xinetd on

• Install mod_python.

  yum install mod_python

• Download latest Check_MK version.

  wget http://mathias-kettner.de/download/check_mk-1.2.4p3.tar.gz

• Extract.

  tar zxvf check_mk-1.2.4p3.tar.gz

• Compile.

  cd check_mk-1.2.4p3
  ./setup.sh
  
  You have chosen the following directories: 
  
   Executable programs             /opt/check_mk/bin                       
   Check_MK configuration          /opt/check_mk/etc                       
   Check_MK software               /opt/check_mk/share                     
   documentation                   /opt/check_mk/share/doc                 
   check manuals                   /opt/check_mk/share/doc/check_mk/checks 
   working directory of check_mk   /opt/check_mk/var/lib                   
   extensions for agents           /usr/lib/check_mk_agent                 
   configuration dir for agents    /etc/check_mk                           
   Name of Nagios user             nagios                                  
   User of Apache process          apache                                  
   Common group of Nagios+Apache   nagcmd                                  
   Nagios binary                   /opt/nagios/bin/nagios                  
   Nagios main configuration file  /opt/nagios/etc/nagios.cfg              
   Nagios object directory         /opt/nagios/etc/check_mk.d              
   Nagios startskript              /etc/init.d/nagios                      
   Nagios command pipe             /opt/nagios/var/rw/nagios.cmd           
   Check results directory         /opt/nagios/var/spool/checkresults      
   Nagios status file              /opt/nagios/var/status.dat              
   Path to check_icmp              /opt/nagios-plugins/libexec/check_icmp  
   URL Prefix for Web addons       /                                       
   Apache config dir               /etc/httpd/conf.d                       
   HTTP authentication file        /opt/nagios/etc/htpasswd.users          
   HTTP AuthName                   Nagios Access                           
   PNP4Nagios templates            /opt/pnp4nagios/share/templates         
   RRD files                       /opt/pnp4nagios/var/perfdata            
   rrdcached socket                /tmp/rrdcached.sock                     
   compile livestatus module       yes                                     
   Nagios / Icinga version         4.0.7                                   
   check_mk's binary modules       /opt/check_mk/lib                       
   Unix socket for Livestatus      /opt/nagios/var/rw/live                 
   Backends for other systems      /opt/check_mk/share/livestatus          
   Install Event Console           no    
  
    Proceed with installation (y/n)? y
  (Compiling MK Livestatus....................................................)
  Installation completed successfully.
  Please restart Nagios and Apache in order to update/active check_mk's web pages.
  
  You can access the new Multisite GUI at http://localhost/check_mk/
                         

• Remove localhost from /opt/nagios/etc/nagios.cfg
• Install Check_MK client on host.
• Configure monitoring host in Check_MK itself.

• Edit /opt/nagios/etc/nagios.cfg

  use_syslog=0

• Restart nagios.

  service nagios restart

• Edit /opt/check_mk/share/check_mk_templates.cfg

  #change the command to force an explicit /bin/sh
  
  define command {
    command_name check-mk-notify
    command_line \
         /bin/sh -c "NOTIFY_CONTACTNAME='$CONTACTNAME$' \
         NOTIFY_CONTACTEMAIL='$CONTACTEMAIL$' \
         NOTIFY_CONTACTPAGER='$CONTACTPAGER$' \
         NOTIFY_NOTIFICATIONTYPE='$NOTIFICATIONTYPE$' \
         NOTIFY_HOSTNOTIFICATIONNUMBER='$HOSTNOTIFICATIONNUMBER$' \
         NOTIFY_SERVICENOTIFICATIONNUMBER='$SERVICENOTIFICATIONNUMBER$' \
         NOTIFY_HOSTPROBLEMID='$HOSTPROBLEMID$' \
         NOTIFY_SERVICEPROBLEMID='$SERVICEPROBLEMID$' \
         NOTIFY_HOSTNAME='$HOSTNAME$' \
         NOTIFY_HOSTALIAS='$HOSTALIAS$' \
         NOTIFY_HOSTADDRESS='$HOSTADDRESS$' \
         NOTIFY_LASTHOSTSTATE='$LASTHOSTSTATE$' \
         NOTIFY_LASTHOSTSTATECHANGE='$LASTHOSTSTATECHANGE$' \
         NOTIFY_HOSTSTATE='$HOSTSTATE$' \
         NOTIFY_HOSTSTATEID='$HOSTSTATEID$' \
         NOTIFY_HOSTCHECKCOMMAND='$HOSTCHECKCOMMAND$' \
         NOTIFY_HOSTOUTPUT='$HOSTOUTPUT$' \
         NOTIFY_HOSTPERFDATA='$HOSTPERFDATA$' \
         NOTIFY_LONGHOSTOUTPUT='$LONGHOSTOUTPUT$' \
         NOTIFY_SERVICEDESC='$SERVICEDESC$' \
         NOTIFY_LASTSERVICESTATE='$LASTSERVICESTATE$' \
         NOTIFY_LASTSERVICESTATECHANGE='$LASTSERVICESTATECHANGE$' \
         NOTIFY_SERVICESTATE='$SERVICESTATE$' \
         NOTIFY_SERVICESTATEID='$SERVICESTATEID$' \
         NOTIFY_SERVICEOUTPUT='$SERVICEOUTPUT$' \
         NOTIFY_LONGSERVICEOUTPUT='$LONGSERVICEOUTPUT$' \
         NOTIFY_SERVICEPERFDATA='$SERVICEPERFDATA$' \
         NOTIFY_SERVICECHECKCOMMAND='$SERVICECHECKCOMMAND$' \
         NOTIFY_DATE='$DATE$' \
         NOTIFY_SHORTDATETIME='$SHORTDATETIME$' \
         NOTIFY_LONGDATETIME='$LONGDATETIME$' \
         NOTIFY_HOSTDOWNTIME='$HOSTDOWNTIME$' \
         NOTIFY_NOTIFICATIONCOMMENT='$NOTIFICATIONCOMMENT$' \
         NOTIFY_NOTIFICATIONAUTHOR='$NOTIFICATIONAUTHOR$' \
         NOTIFY_NOTIFICATIONAUTHORNAME='$NOTIFICATIONAUTHORNAME$' \
         NOTIFY_NOTIFICATIONAUTHORALIAS='$NOTIFICATIONAUTHORALIAS$' \
         NOTIFY_HOSTTAGS='$_HOSTTAGS$' \
         NOTIFY_HOST_SL='$_HOSTEC_SL$' \
         NOTIFY_SVC_SL='$_SERVICEEC_SL$' \
         NOTIFY_SERVICE_SL='$_SERVICEEC_SL$' \
         NOTIFY_HOST_EC_CONTACT='$_HOSTEC_CONTACT$' \
         NOTIFY_SERVICE_EC_CONTACT='$_SERVICEEC_CONTACT$' \
         /usr/bin/check_mk --notify"
  }

• Download latest tar.gz
• Extract
• Run ./setup.sh
• Restart nagios and apache
• Fix notifications (see above), after run cmk -O (captital o)