Check_MK monitoring (from source) - CentOS7

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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:
```
yum install rrdtool perl-rrdtool
```
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

Install Nagios 4

Create user and group.

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

Download latest version.
Extract.
```
tar zxvf nagios-4.0.8.tar.gz
```

Compile Nagios 4.

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

Test and start Nagios, it still uses legacy init:

/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 latest Nagios plugins.

Install Nagios Plugins:

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

Configure services and firewall

Service setup.

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

Open port 80 / 443:

firewall-cmd --permanent --zone public --add-service=http
firewall-cmd --permanent --zone public --add-service=https
firewall-cmd --reload

Give the Nagios localhost http check something.
```
touch /var/www/html/index.html
```
Start Apache, restart Nagios, it should be running on your webserver /nagios
```
service nagios restart
systemctl start httpd
```

Install PNP4Nagios

Download the latest PNP4nagios.
Extract.
```
tar zxvf pnp4nagios.tgz
```

Compile.

cd pnp4nagios-0.6.25
./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.
```
systemctl restart httpd
```

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, it might take a while before data has been processed and images are shown.

Install Check_MK

Install xinetd.

yum install xinetd
service xinetd start
chkconfig xinetd on

Download latest Check_MK version.
Extract.
```
tar zxvf check_mk-1.2.6p1.tar.gz
```

Compile.

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/

mod_python

The current version (1.2.6x) of Check_MK still needs the old mod_python.

Install development tools:
```
yum install python-devel httpd-devel
```
Download latest modpython source code.
Extract:
```
tar zxvf mod_python-3.5.0.tgz
```

Install:

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

Configure and Apache:

# 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

Check_MK Config

Enable and Start mkeventd:

chkconfig --add mkeventd
chkconfig --level 35 mkeventd on
service mkeventd start

Install Check_MK client on host.

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

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:
```
/opt/check_mk/bin/cmk -R.
```

Set rights to enable config 'discard changes'

Modify rights:

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/

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
```
use_syslog=0
```
Restart nagios.
```
service nagios restart
```

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:

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

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)

[linux, monitoring, check mk, centos7]

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