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**If you found this page via Google, I would recommend to use [[check_mk_raw_centos]] instead. Using the 1.4 stable branch.**\\
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====== Check_MK monitoring (from source) - CentOS7 ======
Use this guide to install the latest version of Check_MK and Nagios.

Prerequisites
  * EPEL repository
  * Disable SELinux. Normally i would let SELinux be enabled, but with a monitoring system it is one of the few exceptions I make. This service does too many things SELinux doesn't like.

====Install packages====
  * Install rrdtool: <code>yum install rrdtool perl-rrdtool</code>
  * Install development tools: <code>yum groupinstall development tools</code>
  * Install apache & php. <code>yum install httpd php</code>
  * Install other requirements. <code>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</code>
====Install Nagios 4====
  * Create user and group.<code>useradd nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -G nagcmd apache</code>
  * Download latest version. 
  * Extract. <code>tar zxvf nagios-4.0.8.tar.gz</code>
  * Compile Nagios 4. <code>cd nagios-4.0.8
./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</code>
  * Test and start Nagios, it still uses legacy init:<code>/opt/nagios/bin/nagios -v /opt/nagios/etc/nagios.cfg
service nagios start</code>
  * Edit **/opt/nagios/etc/resource.cfg** <code>$USER1$=/opt/nagios-plugins/libexec</code>
  * Add a default user for Web Interface Access <code>htpasswd -c /opt/nagios/etc/htpasswd.users nagiosadmin</code>
  * Download latest Nagios plugins.
  * Install Nagios Plugins: <code>cd
tar zxvf nagios-plugins-2.0.3.tar.gz
cd /tmp/nagios-plugins-2.0.3
./configure --with-nagios-user=nagios --with-nagios-group=nagios --prefix=/opt/nagios-plugins --exec-prefix=/opt/nagios-plugins
make
make install</code>
====Configure services and firewall====
  * Service setup. <code>chkconfig --add nagios
chkconfig --level 35 nagios on
systemctl enable httpd</code>
  * Open port 80 / 443: <code>firewall-cmd --permanent --zone public --add-service=http
firewall-cmd --permanent --zone public --add-service=https
firewall-cmd --reload</code> 
  * Give the Nagios localhost http check something. <code>touch /var/www/html/index.html</code>
  * Start Apache, restart Nagios, it should be running on your webserver /nagios <code>service nagios restart
systemctl start httpd</code>
====Install PNP4Nagios====
  * Download the latest PNP4nagios.
  * Extract. <code>tar zxvf pnp4nagios.tgz</code>
  * Compile.<code>cd pnp4nagios-0.6.25
./configure --prefix=/opt/pnp4nagios --exec-prefix=/opt/pnp4nagios
make all
make fullinstall</code>
  * Configure apache, edit **/etc/httpd/conf.d/pnp4nagios.conf** <code>AuthUserFile /opt/nagios/etc/htpasswd.users</code>
  * Restart apache. <code>systemctl restart httpd</code>
  * Configure Nagios to use PNP4nagios. Edit **/opt/nagios/etc/nagios.cfg**. <code>#
# 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</code>
  * Edit **/opt/nagios/etc/objects/commands.cfg** Disable sample performance data commands, add: <code>#
# 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
}</code>

  * Remove install file. <code>rm /opt/pnp4nagios/share/install.php</code>
  * Restart nagios. <code>service nagios restart</code>
  * Open /pnp4nagios on your webserver, it might take a while before data has been processed and images are shown.

====Install Check_MK====
  * Install xinetd. <code>yum install xinetd
service xinetd start
chkconfig xinetd on</code>
  * Download latest Check_MK version.
  * Extract. <code>tar zxvf check_mk-1.2.6p1.tar.gz</code>
  * Compile. <code>cd check_mk-1.2.6p1
./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.modules.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         4.0.8
 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           yes
 working directory of mkeventd   /opt/mkeventd/lib

  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/
                       
</code>
====mod_python====
The current version (1.2.6x) of Check_MK still needs the old mod_python. 
  * Install development tools:<code>yum install python-devel httpd-devel</code>
  * Download latest modpython source code.
  * Extract:<code>tar zxvf mod_python-3.5.0.tgz</code>
  * Install:<code>cd mod_python-3.5.0
./configure
make
make install

# Edit /usr/lib64/python2.7/site-packages/mod_python/version.py
# Change version line to: version = "3.5.0"
vi /usr/lib64/python2.7/site-packages/mod_python/version.py</code>
  * Configure and Apache:<code># in /etc/httpd/conf.modules.d, create 00-python.conf with the following LoadModule line inside it
LoadModule python_module modules/mod_python.so

systemctl restart httpd</code>
====Check_MK Config====
  * Enable and Start mkeventd:<code>chkconfig --add mkeventd
chkconfig --level 35 mkeventd on
service mkeventd start</code>
  * Install Check_MK client on host. <code>yum install xinetd

cd check_mk-1.2.6p1
mkdir agents
cd agents
tar zxvf ../agents.tar.gz

mkdir /opt/check_mk_agent
cp check_mk_agent.linux /opt/check_mk_agent/bin/check_mk_agent

cp xinetd.conf /etc/xinetd.d/check_mk_agent
# Edit path and allowed hosts
#        server         = /opt/check_mk_agent/bin/check_mk_agent
#        only_from      = 127.0.0.1
vi /etc/xinetd.d/check_mk_agent

systemctl enable xinetd
systemctl start xinetd



# Test agent
nc 127.0.0.1 6556

</code>
  * Configure monitoring host in Check_MK itself, add host, IP-address 127.0.0.1.
  * Remove localhost from **/opt/nagios/etc/nagios.cfg**, then restart all of Check_MK:<code>/opt/check_mk/bin/cmk -R.</code>
====Set rights to enable config 'discard changes'====
  * Modify rights:<code>chown -R apache.nagcmd /opt/check_mk/etc
chown -R nagios.nagcmd /opt/check_mk/var/lib/
chown -R apache.nagcmd /opt/check_mk/var/lib/wato
chgrp -R nagcmd /opt/nagios/etc/
chown -R apache.nagcmd /opt/check_mk/var/lib/wato

chmod g+w /opt/check_mk/etc
chmod g+w /opt/check_mk/var/lib/
chmod g+w /opt/nagios/etc/</code>
====Modify template====
  * Nagios warns about obsoleted feature, remove **failure_prediction_enabled** from template file **/opt/nagios/etc/check_mk.d/check_mk_templates.cfg**
====Disable Nagios logging to syslog====
  * Edit **/opt/nagios/etc/nagios.cfg** <code>use_syslog=0</code>
  * Restart nagios. <code>service nagios restart</code>


====Quick start agent setup====
**Note: the EPEL version is older and might have some incompatibilities, you can also install the RPM provided with the Check_MK tar.gz**

  * Install check_mk agent via EPEL:<code>yum -y install check-mk-agent
vi /etc/xinetd.d/check-mk-agent # change only_from

firewall-cmd --permanent --zone trusted --add-service=checkmkagent
firewall-cmd --reload

systemctl enable xinetd
systemctl restart xinetd</code>

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

{{tag>[linux monitoring check_mk centos7]}}