To install pre-request packages

Server  Information = Opensuse 15

linux-osradar:~ # uname -a
Linux linux-osradar 4.12.14-lp150.12.28-default #1 SMP Mon Dec 3 16:46:15 UTC 2018 (b91289f) x86_64 x86_64 x86_64 GNU/Linux

First install the pre-request packages by utilizing the following command.

linux-osradar:~ # zypper install apache2 php7 gcc glibc gd wget perl make apache2-mod_php7
Retrieving repository 'openSUSE-Leap-15.0-Update' metadata ............................................................................................................................................[done]
Building repository 'openSUSE-Leap-15.0-Update' cache .................................................................................................................................................[done]
Loading repository data...
Reading installed packages...

Resolving package dependencies...

The following 35 NEW packages are going to be installed:
  apache2 apache2-mod_php7 apache2-prefork apache2-utils gcc gcc7 gd git-web glibc-devel libapr-util1 libapr1 libasan4 libatomic1 libbrotlicommon1 libbrotlienc1 libcilkrts5 libgomp1 libitm1 liblsan0
  libmpx2 libmpxwrappers2 libtsan0 libubsan0 linux-glibc-devel php7 php7-ctype php7-dom php7-iconv php7-json php7-pdo php7-sqlite php7-tokenizer php7-xmlreader php7-xmlwriter system-user-wwwrun

The following 8 recommended packages were automatically selected:
  php7-ctype php7-dom php7-iconv php7-json php7-sqlite php7-tokenizer php7-xmlreader php7-xmlwriter

The following 5 packages are suggested, but will not be installed:
  php7-gd php7-gettext php7-mbstring php7-mysql php7-pear

Enable php7

linux-osradar:/etc/apache2 # a2enmod php7

To check and restart the deleted files, you can use ‘ zypper ps’ to list these programs.

Then create user and group for nagios.

 # useradd nagios
 # groupadd ngadmin nagios nagcmd

Once you have created the user, add those user into the nagios group.

# usermod -a -G ngadmin nagios
# usermod -a -G ngadmin wwwrun

I- download and install Nagios Core

Download the nagios package by running the following command.

linux-osradar:~ # wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.4.3.tar.gz
--2019-01-16 07:56:02--  http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.4.3.tar.gz
Resolving prdownloads.sourceforge.net (prdownloads.sourceforge.net)... 216.105.38.13
..
2019-01-16 07:56:04 (11.0 MB/s) - ‘nagios-4.4.3.tar.gz’ saved [11302228/11302228]

Once the download is completed, extract the downloaded tar package.

linux-osradar:~ # tar  -xvf   nagios-4.4.3.tar.gz
nagios-4.4.3/
nagios-4.4.3/.gitignore
nagios-4.4.3/.travis.yml
nagios-4.4.3/CONTRIBUTING.md
nagios-4.4.3/Changelog
nagios-4.4.3/INSTALLING
nagios-4.4.3/LEGAL
nagios-4.4.3/LICENSE
nagios-4.4.3/Makefile.in
nagios-4.4.3/README.md
nagios-4.4.3/THANKS
nagios-4.4.3/UPGRADING
..

Now compile to install the Nagios.

linux-osradar:~ # cd   nagios-4.4.3/
linux-osradar:~/nagios-4.4.3 # ./configure --with-nagios-group=nagios --with-command-group=nagcmd
........
....

Web Interface Options:
————————
HTML URL: http://localhost/nagios/
CGI URL: http://localhost/nagios/cgi-bin/
Traceroute (used by WAP): /usr/sbin/traceroute

Review the options above for accuracy. If they look okay,
type ‘make all’ to compile the main program and CGIs.

Run the following command to install the Nagios package.

# make all 
.......

     
       ..
 make test

- This runs the test suite

  make install
     - This installs the main program, CGIs, and HTML files

  make install-init
     - This installs the init script in /usr/lib/systemd/system

  make install-daemoninit
     - This will initialize the init script
       in /usr/lib/systemd/system
 make install-groups-users
     - This adds the users and groups if they do not exist

  make install-commandmode
     - This installs and configures permissions on the
       directory for holding the external command file

  make install-config
     - This installs *SAMPLE* config files in /usr/local/nagios/etc
       You'll have to modify these sample files before you can
       use Nagios.  Read the HTML documentation for more info
       on doing this.  Pay particular attention to the docs on
       object configuration files, as they determine what/how
       things get monitored!

  make install-webconf
     - This installs the Apache config file for the Nagios
       web interface

  make install-exfoliation
     - This installs the Exfoliation theme for the Nagios
       web interface

  make install-classicui
     - This installs the classic theme for the Nagios
       web interface

 # make install

*** Main program, CGIs and HTML files installed ***

You can continue with installing Nagios as follows (type 'make'
without any arguments for a list of all possible options):

  make install-init
     - This installs the init script in /usr/lib/systemd/system

  make install-commandmode
     - This installs and configures permissions on the
       directory for holding the external command file

  make install-config
     - This installs sample config files in /usr/local/nagios/etc

..

After installing Nagios, run the make install-init command to add  nagios ervice to   systemd.

linux-osradar:~/nagios-4.4.3 # make install-init
/usr/bin/install -c -m 755 -d -o root -g root /usr/lib/systemd/system
/usr/bin/install -c -m 755 -o root -g root startup/default-service /usr/lib/systemd/system/nagios.service

After installing Nagios, run the make install-config command.

linux-osradar:~/nagios-4.4.3 # 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
.

Then run the make install-commandmode command.

linux-osradar:~/nagios-4.4.3 # 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 ***

Finally use the below command for the webconf installation.

linux-osradar:~/nagios-4.4.3 #  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

*** Nagios/Apache conf file installed ***

Verify the nagios access details as shown below.

# vi /usr/local/nagios/etc/objects/contacts.cfg

After verifying the Nagios access details, create password for nagios login and restart the apache services.

linux-osradar:~/nagios-4.4.3 # htpasswd2 -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin
linux-osradar:~/nagios-4.4.3 #

Adding password for user nagiosadmin

~ # systemctl restart apache2

Invalid command ‘<IfVersion’, perhaps misspelled or defined by a module not included in the server configuration

to solve this. please add this command bellow to your apache or nagios web config

LoadModule version_module /usr/lib64/apache2/mod_version.so

check your apache Now

linux-osradar:~/nagios-4.4.3 # systemctl restart apache2
linux-osradar:~/nagios-4.4.3 # systemctl status apache2
● apache2.service - The Apache Webserver
Loaded: loaded (/usr/lib/systemd/system/apache2.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2019-01-16 08:31:53 EST; 14s ago
Process: 12177 ExecStop=/usr/sbin/start_apache2 -DSYSTEMD -DFOREGROUND -k graceful-stop (code=exited, status=0/SUCCESS)
Main PID: 12185 (httpd-prefork)
Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec"
Tasks: 6
Memory: 4.2M
CPU: 56ms
CGroup: /system.slice/apache2.service
├─12185 /usr/sbin/httpd-prefork -DSYSCONFIG -C PidFile /var/run/httpd.pid -C Include /etc/apache2/sysconfig.d//loadmodule.conf -C Include /etc/apache2/sysconfig.d//global.conf -f /etc/apache2/httpd.conf -c Include /etc/apache>
├─12191 /usr/sbin/httpd-prefork -DSYSCONFIG -C PidFile /var/run/httpd.pid -C Include /etc/apache2/sysconfig.d//loadmodule.conf -C Include /etc/apache2/sysconfig.d//global.conf -f /etc/apache2/httpd.conf -c Include /etc/apache>



Jan 16 08:31:53 linux-osradar systemd[1]: Stopped The Apache Webserver.
Jan 16 08:31:53 linux-osradar systemd[1]: Starting The Apache Webserver...
Jan 16 08:31:53 linux-osradar systemd[1]: Started The Apache Webserver.

II-Download  and Install  the Nagios plugin.

linuxhelp:/tmp # wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz 
--2016-09-16 19:42:48-- http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
Resolving nagios-plugins.org (nagios-plugins.org)... 72.14.186.43
Connecting to nagios-plugins.org (nagios-plugins.org)|72.14.186.43|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2659772 (2.5M) [application/x-gzip]
Saving to: ‘ nagios-plugins-2.0.3.tar.gz’ 

nagios-plugins-2.0.3.tar.gz 100%[=================================================> ] 2.54M 581KB/s in 5.1s

2016-09-16 19:42:53 (512 KB/s) - ‘ nagios-plugins-2.0.3.tar.gz’  saved [2659772/2659772]

Run the following command to extract the nagios plugin.

linux-osradar:~ # wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
--2019-01-16 08:34:23--  https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
Resolving nagios-plugins.org (nagios-plugins.org)... 72.14.186.43
Connecting to nagios-plugins.org (nagios-plugins.org)|72.14.186.43|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2728818 (2.6M) [application/x-gzip]
Saving to: ‘nagios-plugins-2.2.1.tar.gz’

nagios-plugins-2.2.1.tar.gz                                  12%[================>

After extraction, compile and install the nagios plugin.

linux-osradar:~ # tar -xvf nagios-plugins-2.2.1.tar.gz 
linux-osradar:~ # cd nagios-plugins-2.2.1/
linux-osradar:~/nagios-plugins-2.2.1 # ./configure --with-nagios-user=nagios --with-nagios-group=nagios

--with-trusted-path: /bin:/sbin:/usr/bin:/usr/sbin
--enable-libtap: no

Use the following command to start installing the Nagios plugin.

'
linux-osradar:~/nagios-plugins-2.2.1 # make
checking for symlink... yes
checking for mbsinit... yes
checking for mbrtowc... yes
checking for mprotect... yes
checking for _set_invalid_parameter_handler... no
checking for nl_langinfo... yes
checking for isblank... yes
.

After the plugins are installed, check the nagios configuration file.

linux-osradar:~/nagios-plugins-2.2.1 #  /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Core 4.4.3
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 2019-01-15
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

Lets Start the nagios service

linux-osradar:~/nagios-plugins-2.2.1 # systemctl restart   nagios
linux-osradar:~/nagios-plugins-2.2.1 # systemctl  status   nagios
● nagios.service - Nagios Core 4.4.3
   Loaded: loaded (/usr/lib/systemd/system/nagios.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2019-01-16 08:42:51 EST; 4s ago
     Docs: https://www.nagios.org/documentation
  Process: 32229 ExecStopPost=/usr/bin/rm -f /usr/local/nagios/var/rw/nagios.cmd (code=exited, status=0/SUCCESS)
  Process: 32228 ExecStop=/usr/bin/kill -s TERM ${MAINPID} (code=exited, status=0/SUCCESS)
  Process: 32231 ExecStart=/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
  Process: 32230 ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (code=exited, status=0/SUCCESS)
 Main PID: 32232 (nagios)
    Tasks: 6 (limit: 4915)
   Memory: 2.3M
      CPU: 17ms

You can also use the following command to start the nagios and apache  on boot itself.

linux-osradar:~/nagios-plugins-2.2.1 # systemctl    enable  nagios
Created symlink /etc/systemd/system/multi-user.target.wants/nagios.service → /usr/lib/systemd/system/nagios.service.
linux-osradar:~/nagios-plugins-2.2.1 # systemctl    enable  apache2
Created symlink /etc/systemd/system/httpd.service → /usr/lib/systemd/system/apache2.service.
Created symlink /etc/systemd/system/apache.service → /usr/lib/systemd/system/apache2.service.
Created symlink /etc/systemd/system/multi-user.target.wants/apache2.service → /usr/lib/systemd/system/apache2.service.
linux-osradar:~/nagios-plugins-2.2.1 #

Trigger the browser with the following URL http://< IP_address> /nagios and enter the user credentials to login into the Nagios. please  login with nagiosadmin user

if you have issues to detect the plugins directory, please copy them all to /usr/local/nagios/lib/

This Tutorial is tested under  my Opensuse 15 VM ,  and  its working 100%

Now you can start checking the status of your server.

if you have  issues with  PHP please  consult install lamp  on opensuse15

How to Install Apache, MariaDB, PHP7 (LAMP) on openSUSE Leap 15

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