Installing and setting up nagios on centos 7
Created - 06/11/2015
Last Tested - N/A
OS: Centos
Install httpd
Command= yum install httpd
Command= systemctl start httpd.service
–auto start http at boot–
Command= systemctl enable httpd.service
allow firewall ports
I'm going to disable firewalld and fall back to iptables.
Command= yum install -y iptables-services
Command= systemctl mask firewalld
Command= systemctl enable iptables
Command= systemctl stop firewalld
Command= systemctl start iptables
allow port 80.
Command= iptables -I INPUT -p tcp –destination-port 80 -j ACCEPT
save iptables using the following command.
Command= iptables-save>/etc/sysconfig/iptables
Installing php
Command= yum install -y php
restart the php service.
Command= systemctl restart httpd.service
Install nagios pre reqs
Command= yum install gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel
Add user and groups
Command= useradd nagios
Command= groupadd nagcmd
Command= usermod -a -G nagcmd nagios
Install Nagios Core
Command= cd ~
Download Nagios
Latest stable release curl -L -O http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz
Latest release candidate curl -L -O http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.1.0rc1.tar.gz
Extract the Nagios
Command= tar xvf nagios-*.tar.gz
Command= cd nagios-*
Configure Nagios / remove the space in the following command between the two - -
Command= ./configure - -with-command-group=nagcmd
Command= make all
Command= make install
Command= make install-commandmode
Command= make install-init
Command= make install-config
Command= make install-webconf
add apache user to the nagcmd group.
Command= usermod -G nagcmd apache
Install Nagios Plugins
Command= cd ~
curl -L -O http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
Command= tar xvf nagios-plugins-*.tar.gz
Command= cd nagios-plugins-*
remove the space in the following command between the two - -
Command= ./configure - -with-nagios-user=nagios - -with-nagios-group=nagios - -with-openssl
Command= make
Command= make install
Install NRPE
Command= cd ~
curl -L -O http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz Check for latest version here: http://sourceforge.net/projects/nagios/files/nrpe-2.x/
Command= tar xvf nrpe-*.tar.gz
Command= cd nrpe-*
remove the space in the following command between the two - -
Command= ./configure - -enable-command-args - -with-nagios-user=nagios - -with-nagios-group=nagios - -with-ssl=/usr/bin/openssl - -with-ssl-lib=/usr/lib/x86_64-linux-gnu
Command= make all
Command= make install
Command= make install-xinetd
Command= make install-daemon-config
edit xinetd startup script
Command= nano /etc/xinetd.d/nrpe
only_from = 127.0.0.1 ADD-IP-HERE
Save and Exit.
Command= service xinetd restart
Configure Nagios
Command= nano /usr/local/nagios/etc/nagios.cfg
Uncomment the following line.
#cfg_dir=/usr/local/nagios/etc/servers
Save and Exit.
Create the storage location for configuration files.
Command= mkdir /usr/local/nagios/etc/servers
Configure Nagios Contacts
Command= nano /usr/local/nagios/etc/objects/contacts.cfg
change [email protected] to your email address.
email [email protected] ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
Save and Exit.
Configure check_nrpe Command
Command= nano /usr/local/nagios/etc/objects/commands.cfg
Add the following to the end of the config file.
define command{ command_name check_nrpe command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ }
Save and Exit.
Configure Apache
You can change nagiosadmin that will be your username. This will require more config HERE.
Command= htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Enter a password.
Restart nagios and apache service.
Command= sudo systemctl start nagios.service
Command= sudo systemctl restart httpd.service
setting nagios to run at boot.
Command= sudo chkconfig nagios on
( ONLY IF YOU CHANGED THE USERNAME!)
changing user authorized for host.
change every nagiosadmin
to your new username in the following file.
Comman= nano /usr/local/nagios/etc/cgi.cfg
ERRORS - FIXES
Error: Could not stat() command file '/usr/local/nagios/var/rw/nagios.cmd'!
Command= setenforce 0
Permanent fix.
Command= nano /etc/sysconfig/selinux
change SELINUX=enforce to SELINUX=permissive