How to setup nagios server on Linux ?
Nagios Installation on Linux
1. First create User and Group
# useradd nagios # groupadd nagcmd # usermod -G nagcmd nagios # usermod -g nagcmd apache [root@ngelinux001 ~]# id apache uid=48(apache) gid=30334(nagcmd) groups=30334(nagcmd) [root@ngelinux001 ~]# id nagios uid=493(nagios) gid=485(nagios) groups=30334(nagcmd),3813(nagios),485(nagios)
2. Make Nagios directory and download package.
[root@ngelinux001 ~]# mkdir /root/nagios [root@ngelinux001 ~]# cd /root/nagios/ [root@ngelinux001 nagios]# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz --2022-05-17 18:16:20-- https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz Resolving assets.nagios.com... 45.79.49.120, 2600:3c00::f03c:92ff:fef7:45ce Connecting to assets.nagios.com|45.79.49.120|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 11304463 (11M) [application/x-gzip] Saving to: “nagios-4.4.5.tar.gz” 100%[====================================================================================>] 11,304,463 2.19M/s in 4.9s 2022-05-17 18:16:26 (2.19 MB/s) - “nagios-4.4.5.tar.gz” saved [11304463/11304463] [root@ngelinux001 nagios]# wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz --no-check-certificate --2022-05-17 18:16:39-- https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz Resolving nagios-plugins.org... 45.56.123.251 Connecting to nagios-plugins.org|45.56.123.251|:443... connected. WARNING: cannot verify nagios-plugins.org’s certificate, issued by “/C=US/O=Let's Encrypt/CN=R3”: Issued certificate has expired. HTTP request sent, awaiting response... 200 OK Length: 2728818 (2.6M) [application/x-gzip] Saving to: “nagios-plugins-2.2.1.tar.gz” 100%[====================================================================================>] 2,728,818 927K/s in 2.9s 2022-05-17 18:16:43 (927 KB/s) - “nagios-plugins-2.2.1.tar.gz” saved [2728818/2728818] [root@ngelinux001 nagios]#
3. Unzip the Nagios packages.
[root@ngelinux001 nagios]# tar -xvf nagios-4.4.5.tar.gz [root@ngelinux001 nagios]# tar -xvf nagios-plugins-2.2.1.tar.gz [root@ngelinux001 nagios]# ls -l total 13716 drwxrwxr-x 20 root root 4096 Aug 20 2019 nagios-4.4.5 -rw-r--r-- 1 root root 11304463 Aug 20 2019 nagios-4.4.5.tar.gz drwxr-xr-x 15 root root 4096 Apr 19 2017 nagios-plugins-2.2.1 -rw-r--r-- 1 root root 2728818 Apr 19 2017 nagios-plugins-2.2.1.tar.gz [root@ngelinux001 nagios]# cd nagios-4.4.5 [root@ngelinux001 nagios-4.4.5]# ls aclocal.m4 config.guess docs indent.sh Makefile.in pkginfo.in tap worker autoconf-macros config.sub doxy.conf INSTALLING make-tarball README.md test xdata base configure functions install-sh mkpackage sample-config THANKS cgi configure.ac html LEGAL module startup t-tap Changelog contrib include lib nagios.spec subst.in update-version common CONTRIBUTING.md indent-all.sh LICENSE nagios.sysconfig t UPGRADING [root@ngelinux001 nagios-4.4.5]#
4. Configure the package.
# ./configure --with-command-group=nagcmd
*** Configuration summary for nagios 4.4.5 2019-08-20 ***:
General Options:
-------------------------
Nagios executable: nagios
Nagios user/group: nagios,nagios
Command user/group: nagios,nagcmd
Event Broker: yes
Install ${prefix}: /usr/local/nagios
Install ${includedir}: /usr/local/nagios/include/nagios
Lock file: /var/run/nagios.lock
Check result directory: /usr/local/nagios/var/spool/checkresults
Init directory: /etc/init.d
Apache conf.d directory: /etc/httpd/conf.d
Mail program: /bin/mail
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): /bin/traceroute
Review the options above for accuracy. If they look okay,
type 'make all' to compile the main program and CGIs.
[root@ngelinux001 nagios-4.4.5]#
5. Install the package.
[root@ngelinux001 nagios-4.4.5]# make all
cd ./base && make
make[1]: Entering directory `/root/nagios/nagios-4.4.5/base'
gcc -Wall -I -g -O2 -DHAVE_CONFIG_H -DNSCORE -c -o nagios.o nagios.c
gcc -Wall -I -g -O2 -DHAVE_CONFIG_H -DNSCORE -c -o broker.o broker.c
gcc -Wall -I -g -O2 -DHAVE_CONFIG_H -DNSCORE -c -o nebmods.o nebmods.c
gcc -Wall -I -g -O2 -DHAVE_CONFIG_H -DNSCORE -c -o /common/shared.o /com
[root@ngelinux001 nagios-4.4.5]# 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 /etc/init.d
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
6. Install the configuration files.
[root@ngelinux001 nagios-4.4.5]# make install-init /usr/bin/install -c -m 755 -d -o root -g root /etc/init.d /usr/bin/install -c -m 755 -o root -g root startup/default-init /etc/init.d/nagios [root@ngelinux001 nagios-4.4.5]# 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 /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 ***
7. Define Contacts in the file.
# vi /usr/local/nagios/etc/objects/contacts.cfg
define contact {
contact_name User ; Short name of user
use generic-contact ; Inherit default values from generic-contact template (defined above)
alias User Jain ; Full name of user
email user@ngelinux.com ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
}
define contactgroup {
contactgroup_name admins
alias Nagios Administrators
members nagiosadmin User
}
8. Configuring web interface for nagios
# make install-webconf This will copy /etc/httpd/conf.d/nagios.conf file.
9. Set password for users.
[root@ngelinux001 User]# htpasswd -s -c /usr/local/nagios/etc/htpasswd.users nagiosadmin New password: Re-type new password: Adding password for user nagiosadmin [root@ngelinux001 User]# htpasswd -s -c /usr/local/nagios/etc/htpasswd.users User New password: Re-type new password: Adding password for user User [root@ngelinux001 User]#
10. Restart Apache to make the new settings take effect.
[root@ngelinux001 User]# service httpd restart
Stopping httpd: [ OK ]
Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using 172.23.90.98 for ServerName
[ OK ]
[root@ngelinux001 User]#
11. Compile and install nagios plugins
[root@ngelinux001 User]# cd /root/nagios/ [root@ngelinux001 nagios]# cd nagios-plugins-2.2.1 [root@ngelinux001 nagios-plugins-2.2.1]# ls ABOUT-NLS ChangeLog configure.ac lib nagios-plugins.spec.in plugins REQUIREMENTS acinclude.m4 CODING COPYING m4 NEWS plugins-root SUPPORT ACKNOWLEDGEMENTS config.h.in FAQ Makefile.am NPTest.pm plugins-scripts tap aclocal.m4 config.rpath gl Makefile.in NP-VERSION-GEN po test.pl.in AUTHORS config_test INSTALL mkinstalldirs perlmods README THANKS build-aux configure LEGAL nagios-plugins.spec pkg release tools [root@ngelinux001 nagios-plugins-2.2.1]# [root@ngelinux001 nagios-plugins-2.2.1]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk [root@ngelinux001 nagios-plugins-2.2.1]# make make all-recursive make[1]: Entering directory `/root/nagios/nagios-plugins-2.2.1' Making all in gl # make install
12. Verify the nagios status
# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
13. Enable nagios service
[root@ngelinux001 nagios-plugins-2.2.1]# chkconfig --add nagios [root@ngelinux001 nagios-plugins-2.2.1]# chkconfig --level 35 nagios on [root@ngelinux001 nagios-plugins-2.2.1]# chkconfig --add httpd [root@ngelinux001 nagios-plugins-2.2.1]# chkconfig --level 35 httpd on # systemctl enable nagios # systemctl enable httpd