Nagios Core is a free and open source software application that provides monitoring and alerting services for servers, switches, applications and services. It monitors targets (i.e. hosts and services) and alerts users when something go wrong and alerts them a second time when the problem has been resolved. Nagios Core is primary application and monitoring and alerting engine, around that hundred of Nagios Projects are built.
In this article, we will install and configure Nagios Core 4.4 on CentOS 7 server.
Before moving forward, it is required to have basic concepts of Nagios Core 4. Therefore, it is highly recommended that you should have Learning Nagios - Third Edition. It will be really helpful for you during your Nagios journey.
This Article Provides:
System Specification:
We have configured a CentOS 7 virtual machine with following specifications:
- Operating System - CentOS 7.6
- Nagios Core - 4.4.2
- Hostname - nagios-01.example.com
- IP Address: - 192.168.116.130/24
Install Nagios Core 4.4 on CentOS 7:
Connect to nagios-01.example.com using ssh.
Install pre-requisite packages using yum command.
[root@nagios-01 setup]# yum install -y gcc glibc glibc-common wget unzip httpd php gd gd-devel perl postfix
...
Installed:
gcc.x86_64 0:4.8.5-36.el7 gd.x86_64 0:2.0.35-26.el7
gd-devel.x86_64 0:2.0.35-26.el7 httpd.x86_64 0:2.4.6-88.el7.centos
perl.x86_64 4:5.16.3-293.el7 php.x86_64 0:5.4.16-46.el7
unzip.x86_64 0:6.0-19.el7
Dependency Installed:
apr.x86_64 0:1.4.8-3.el7_4.1
apr-util.x86_64 0:1.5.2-6.el7
cpp.x86_64 0:4.8.5-36.el7
dejavu-fonts-common.noarch 0:2.33-6.el7
dejavu-sans-fonts.noarch 0:2.33-6.el7
expat-devel.x86_64 0:2.1.0-10.el7_3
fontconfig.x86_64 0:2.13.0-4.3.el7
fontconfig-devel.x86_64 0:2.13.0-4.3.el7
fontpackages-filesystem.noarch 0:1.44-8.el7
freetype-devel.x86_64 0:2.8-12.el7
glibc-devel.x86_64 0:2.17-260.el7
glibc-headers.x86_64 0:2.17-260.el7
httpd-tools.x86_64 0:2.4.6-88.el7.centos
kernel-headers.x86_64 0:3.10.0-957.1.3.el7
libICE.x86_64 0:1.0.9-9.el7
libSM.x86_64 0:1.2.2-2.el7
libX11.x86_64 0:1.6.5-2.el7
libX11-common.noarch 0:1.6.5-2.el7
libX11-devel.x86_64 0:1.6.5-2.el7
libXau.x86_64 0:1.0.8-2.1.el7
libXau-devel.x86_64 0:1.0.8-2.1.el7
libXext.x86_64 0:1.3.3-3.el7
libXpm.x86_64 0:3.5.12-1.el7
libXpm-devel.x86_64 0:3.5.12-1.el7
libXt.x86_64 0:1.1.5-3.el7
libjpeg-turbo.x86_64 0:1.2.90-6.el7
libjpeg-turbo-devel.x86_64 0:1.2.90-6.el7
libmpc.x86_64 0:1.0.1-3.el7
libpng-devel.x86_64 2:1.5.13-7.el7_2
libuuid-devel.x86_64 0:2.23.2-59.el7
libxcb.x86_64 0:1.13-1.el7
libxcb-devel.x86_64 0:1.13-1.el7
libzip.x86_64 0:0.10.1-8.el7
mailcap.noarch 0:2.1.41-2.el7
mpfr.x86_64 0:3.1.1-4.el7
perl-Carp.noarch 0:1.26-244.el7
perl-Encode.x86_64 0:2.51-7.el7
perl-Exporter.noarch 0:5.68-3.el7
perl-File-Path.noarch 0:2.09-2.el7
perl-File-Temp.noarch 0:0.23.01-3.el7
perl-Filter.x86_64 0:1.49-3.el7
perl-Getopt-Long.noarch 0:2.40-3.el7
perl-HTTP-Tiny.noarch 0:0.033-3.el7
perl-PathTools.x86_64 0:3.40-5.el7
perl-Pod-Escapes.noarch 1:1.04-293.el7
perl-Pod-Perldoc.noarch 0:3.20-4.el7
perl-Pod-Simple.noarch 1:3.28-4.el7
perl-Pod-Usage.noarch 0:1.63-3.el7
perl-Scalar-List-Utils.x86_64 0:1.27-248.el7
perl-Socket.x86_64 0:2.010-4.el7
perl-Storable.x86_64 0:2.45-3.el7
perl-Text-ParseWords.noarch 0:3.29-4.el7
perl-Time-HiRes.x86_64 4:1.9725-3.el7
perl-Time-Local.noarch 0:1.2300-2.el7
perl-constant.noarch 0:1.27-2.el7
perl-libs.x86_64 4:5.16.3-293.el7
perl-macros.x86_64 4:5.16.3-293.el7
perl-parent.noarch 1:0.225-244.el7
perl-podlators.noarch 0:2.5.1-3.el7
perl-threads.x86_64 0:1.87-4.el7
perl-threads-shared.x86_64 0:1.43-6.el7
php-cli.x86_64 0:5.4.16-46.el7
php-common.x86_64 0:5.4.16-46.el7
xorg-x11-proto-devel.noarch 0:2018.4-1.el7
zlib-devel.x86_64 0:1.2.7-18.el7
Complete!
Currently, Nagios Core does not compliance with SELinux, therefore we have to disable SELinux.
[root@nagios-01 setup]# sed -i 's/SELINUX=.*/SELINUX=disabled/g' /etc/selinux/config
[root@nagios-01 setup]# setenforce 0
Create a directory for downloading Nagios Core source.
[root@nagios-01 ~]# mkdir setup
Download Nagios Core from https://www.nagios.org/downloads/nagios-core/.
[root@nagios-01 ~]# cd ~/setup
[root@nagios-01 setup]# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.2.tar.gz
--2018-12-23 10:35:22-- https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.2.tar.gz
Resolving assets.nagios.com (assets.nagios.com)... 72.14.181.71, 2600:3c00::f03c:91ff:fedf:b821
Connecting to assets.nagios.com (assets.nagios.com)|72.14.181.71|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 11301454 (11M) [application/x-gzip]
Saving to: ânagios-4.4.2.tar.gzâ
100%[======================================>] 11,301,454 1.16MB/s in 10s
2018-12-23 10:35:34 (1.03 MB/s) - ânagios-4.4.2.tar.gzâ saved [11301454/11301454]
Extract downloaded source of Nagios Core.
[root@nagios-01 setup]# tar xvf nagios-4.4.2.tar.gz
...
nagios-4.4.2/xdata/xpddefault.h
nagios-4.4.2/xdata/xrddefault.c
nagios-4.4.2/xdata/xrddefault.h
nagios-4.4.2/xdata/xsddefault.c
nagios-4.4.2/xdata/xsddefault.h
Compile and install Nagios Core from extracted source.
[root@nagios-01 setup]# cd ~/setup/nagios-4.4.2
[root@nagios-01 nagios-4.4.2]# ./configure
config.status: creating t/Makefile
config.status: creating t-tap/Makefile
config.status: creating include/config.h
config.status: creating lib/snprintf.h
config.status: creating lib/iobroker.h
Creating sample config files in sample-config/ ...
*** Configuration summary for nagios 4.4.2 2018-08-16 ***:
General Options:
-------------------------
Nagios executable: nagios
Nagios user/group: nagios,nagios
Command user/group: nagios,nagios
Event Broker: yes
Install ${prefix}: /usr/local/nagios
Install ${includedir}: /usr/local/nagios/include/nagios
Lock file: /run/nagios.lock
Check result directory: /usr/local/nagios/var/spool/checkresults
Init directory: /lib/systemd/system
Apache conf.d directory: /etc/httpd/conf.d
Mail program: /usr/sbin/sendmail
Host OS: linux-gnu
IOBroker Method: epoll
Web Interface Options:
------------------------
HTML URL: http://localhost/nagios/
CGI URL: http://localhost/nagios/cgi-bin/
Traceroute (used by WAP):
Review the options above for accuracy. If they look okay,
type 'make all' to compile the main program and CGIs.
[root@nagios-01 nagios-4.4.2]# make all
...
make[1]: Entering directory `/root/setup/nagios-4.4.2/worker'
cd ./ping && make all
make[2]: Entering directory `/root/setup/nagios-4.4.2/worker/ping'
gcc -I.. -I ../../include -I ../.. -g -O2 -DHAVE_CONFIG_H -o worker-ping worker-ping.c -L ../../lib -l nagios
make[2]: Leaving directory `/root/setup/nagios-4.4.2/worker/ping'
make[1]: Leaving directory `/root/setup/nagios-4.4.2/worker'
*** Compile finished ***
If the main program and CGIs compiled without any errors, you
can continue with testing or installing Nagios as follows (type
'make' without any arguments for a list of all possible options):
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 /lib/systemd/system
make install-daemoninit
- This will initialize the init script
in /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
*** Support Notes *******************************************
If you have questions about configuring or running Nagios,
please make sure that you:
- Look at the sample config files
- Read the documentation on the Nagios Library at:
https://library.nagios.com
before you post a question to one of the mailing lists.
Also make sure to include pertinent information that could
help others help you. This might include:
- What version of Nagios you are using
- What version of the plugins you are using
- Relevant snippets from your config files
- Relevant error messages from the Nagios log file
For more information on obtaining support for Nagios, visit:
https://support.nagios.com
*************************************************************
Enjoy.
Create OS user and groups for Nagios Core.
[root@nagios-01 nagios-4.4.2]# make install-groups-users
groupadd -r nagios
useradd -g nagios nagios
[root@nagios-01 nagios-4.4.2]# usermod -a -G nagios apache
Install Nagios Core 4.4 now.
[root@nagios-01 nagios-4.4.2]# make install
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/libexec
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/var
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/var/archives
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/var/spool/checkresults
chmod g+s /usr/local/nagios/var/spool/checkresults
*** 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 /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
make[1]: Leaving directory `/root/setup/nagios-4.4.2'
Install Nagios Core service.
[root@nagios-01 nagios-4.4.2]# make install-daemoninit
/usr/bin/install -c -m 755 -d -o root -g root /lib/systemd/system
/usr/bin/install -c -m 755 -o root -g root startup/default-service /lib/systemd/system/nagios.service
Created symlink from /etc/systemd/system/multi-user.target.wants/nagios.service to /usr/lib/systemd/system/nagios.service.
*** Init script installed ***
Enable httpd service.
[root@nagios-01 nagios-4.4.2]# systemctl enable httpd.service
Created symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service.
Install and configure external command file.
[root@nagios-01 nagios-4.4.2]# make install-commandmode
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/var/rw
chmod g+s /usr/local/nagios/var/rw
*** External command directory configured ***
Install Sample configuration files for Nagios Core.
[root@nagios-01 nagios-4.4.2]# make install-config
/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.
Add Nagios Core configurations to Apache Web Server.
[root@nagios-01 nagios-4.4.2]# make install-webconf
/usr/bin/install -c -m 644 sample-config/httpd.conf /etc/httpd/conf.d/nagios.conf
if [ 0 -eq 1 ]; then \
ln -s /etc/httpd/conf.d/nagios.conf /etc/apache2/sites-enabled/nagios.conf; \
fi
*** Nagios/Apache conf file installed ***
Configure Linux Firewall to allow http service.
[root@nagios-01 nagios-4.4.2]# firewall-cmd --permanent --add-service=http
success
[root@nagios-01 nagios-4.4.2]# firewall-cmd --reload
success
Nagios does not have integrated user authentication, therefore, we have to use Basic HTTP authentication for this purpose.
Create an admin user for Nagios Core Web UI.
[root@nagios-01 nagios-4.4.2]# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin
Start httpd & nagios services.
[root@nagios-01 nagios-4.4.2]# systemctl start httpd.service
[root@nagios-01 nagios-4.4.2]# systemctl start nagios.service
Warning: nagios.service changed on disk. Run 'systemctl daemon-reload' to reload units.
[root@nagios-01 nagios-4.4.2]# systemctl daemon-reload
Browse URL http://192.168.116.130/nagios to connect with Nagios Core Web UI.
Login using nagiosadmin user.
Go to services page.
You can see that all the services are unavailable. It is because we don’t have installed Nagios Plugins on our CentOS 7 server.
Install Nagios Plugins on CentOS 7 Server:
Install pre-requisite packages for Nagios Plugins using yum command.
[root@nagios-01 nagios-4.4.2]# yum install -y perl-Net-SNMPyum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils epel-release
...
Installed:
autoconf.noarch 0:2.69-11.el7 automake.noarch 0:1.13.4-3.el7
epel-release.noarch 0:7-11 net-snmp.x86_64 1:5.7.2-37.el7
net-snmp-utils.x86_64 1:5.7.2-37.el7 openssl-devel.x86_64 1:1.0.2k-16.el7
Dependency Installed:
keyutils-libs-devel.x86_64 0:1.5.8-3.el7
krb5-devel.x86_64 0:1.15.1-34.el7
libcom_err-devel.x86_64 0:1.42.9-13.el7
libkadm5.x86_64 0:1.15.1-34.el7
libselinux-devel.x86_64 0:2.5-14.1.el7
libsepol-devel.x86_64 0:2.5-10.el7
libverto-devel.x86_64 0:0.2.5-4.el7
lm_sensors-libs.x86_64 0:3.4.0-6.20160601gitf9185e5.el7
m4.x86_64 0:1.4.16-10.el7
net-snmp-agent-libs.x86_64 1:5.7.2-37.el7
net-snmp-libs.x86_64 1:5.7.2-37.el7
pcre-devel.x86_64 0:8.32-17.el7
perl-Data-Dumper.x86_64 0:2.145-3.el7
perl-Test-Harness.noarch 0:3.28-3.el7
perl-Thread-Queue.noarch 0:3.02-2.el7
Complete!
[root@nagios-01 nagios-4.4.2]# yum install -y perl-Net-SNMP
...
Installed:
perl-Net-SNMP.noarch 0:6.0.1-7.el7
Dependency Installed:
perl-Crypt-DES.x86_64 0:2.05-20.el7 perl-Digest.noarch 0:1.17-245.el7
perl-Digest-HMAC.noarch 0:1.03-5.el7 perl-Digest-MD5.x86_64 0:2.52-3.el7
perl-Digest-SHA.x86_64 1:5.85-4.el7 perl-Digest-SHA1.x86_64 0:2.13-9.el7
perl-Socket6.x86_64 0:0.23-15.el7
Complete!
Download Nagios Plugins from https://www.nagios.org/downloads/nagios-plugins/.
[root@nagios-01 ~]# cd ~/setup
[root@nagios-01 setup]# wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
--2018-12-23 10:37:19-- 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: ânagios-plugins-2.2.1.tar.gzâ
100%[======================================>] 2,728,818 813KB/s in 3.3s
2018-12-23 10:37:24 (813 KB/s) - ânagios-plugins-2.2.1.tar.gzâ saved [2728818/2728818]
Extract downloaded source of Nagios Plugins.
[root@nagios-01 nagios-4.4.2]# cd ~/setup
[root@nagios-01 setup]# tar xvf nagios-plugins-2.2.1.tar.gz
...
nagios-plugins-2.2.1/pkg/solaris/solpkg
nagios-plugins-2.2.1/pkg/solaris/pkginfo.in
nagios-plugins-2.2.1/pkg/solaris/pkginfo
nagios-plugins-2.2.1/pkg/redhat/
nagios-plugins-2.2.1/pkg/redhat/requires
Compile Nagios Plugins source.
[root@nagios-01 setup]# cd ~/setup/nagios-plugins-2.2.1
[root@nagios-01 nagios-plugins-2.2.1]# ./configure
...
config.status: executing libtool commands
config.status: executing po-directories commands
config.status: creating po/POTFILES
config.status: creating po/Makefile
Install Nagios Plugins.
[root@nagios-01 nagios-plugins-2.2.1]# make
...
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/root/setup/nagios-plugins-2.2.1/po'
make[2]: Entering directory `/root/setup/nagios-plugins-2.2.1'
make[2]: Leaving directory `/root/setup/nagios-plugins-2.2.1'
make[1]: Leaving directory `/root/setup/nagios-plugins-2.2.1'
[root@nagios-01 nagios-plugins-2.2.1]# make install
...
make[2]: Entering directory `/root/setup/nagios-plugins-2.2.1'
make[2]: Nothing to be done for `install-exec-am'.
make[2]: Nothing to be done for `install-data-am'.
make[2]: Leaving directory `/root/setup/nagios-plugins-2.2.1'
make[1]: Leaving directory `/root/setup/nagios-plugins-2.2.1'
Go to Nagios Web UI and open services page.
You can see that, now all the services are in OK state now. (Note: Keep patience, Nagios Core takes a while to collect data for each service)
We have successfully install and configure Nagios Core 4.4 on our CentOS 7 server.
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