Install NCPA on a Debian 10 (on the remote machine to be controlled by nagios)
Install NRPE (to remote host, NOT on the controller
NRPE on Ubuntu, see also Install NRPE on too old Ubuntu (<=16.04)
example config for a server without ncpa
example config for a server with ncpa
chustom_check_mem script for nrpe
| # Source of truth | |
| # https://support.nagios.com/kb/article/nagios-core-installing-nagios-core-from-source-96.html#Debian | |
| # About nginx installation | |
| # https://olivertappin.com/command-line-tools/installing-nagios-nginx-php-fpm-nagiosgraph-ubuntu-16-04/ | |
| # All steps on debian require root AND `-` to use full env | |
| su - | |
| # Prerequisites | |
| apt-get update | |
| apt-get install -y autoconf gcc make unzip apache2-utils php libgd-dev | |
| # Nagios Core Download | |
| cd /tmp | |
| wget -O nagioscore.tar.gz https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.6.tar.gz | |
| tar xzf nagioscore.tar.gz | |
| rm nagioscore.tar.gz | |
| # Nagios Core Build from source and install | |
| cd /tmp/nagioscore-nagios-4.4.6/ | |
| ./configure --with-httpd-conf=/etc/apache2/sites-enabled | |
| make all | |
| # On a new server, now it's time to create nagios user | |
| make install-groups-users | |
| usermod -a -G nagios www-data | |
| make install | |
| make install-daemoninit | |
| make install-commandmode | |
| make install-config | |
| make install-webconf | |
| # If using Apache | |
| # a2enmod rewrite | |
| # a2enmod cgi | |
| # Configurare firewall | |
| iptables -I INPUT -p tcp --destination-port 80 -j ACCEPT | |
| apt-get install -y iptables-persistent | |
| # This is needed both with apache2 and with nginx to password protect admin panel | |
| htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin | |
| # If using Apache 2 | |
| # systemctl restart apache2 | |
| # Nagios Plugin Prerequisites | |
| apt-get install -y autoconf gcc libc6 libmcrypt-dev make libssl-dev wget bc gawk dc build-essential snmp libnet-snmp-perl gettext | |
| # Nagios Plugin Download | |
| cd /tmp | |
| wget --no-check-certificate -O nagios-plugins.tar.gz https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz | |
| tar zxf nagios-plugins.tar.gz | |
| rm nagios-plugins.tar.gz | |
| # Nagios Plugin Installation | |
| cd nagios-plugins-2.3.3 | |
| ./configure | |
| make | |
| make install | |
| # If you want to use nginx, now | |
| # Now create /etc/nginx/sites-available/nagios.conf | |
| # See attached nagios.conf | |
| # else go on and you have alrighgt apache2 | |
| # Enable the site | |
| # ln -s /etc/nginx/sites-available/nagios.conf /etc/nginx/sites-enabled/nagios.conf | |
| # Restart Nginx (it's automatically gracefully) | |
| # systemctl restart nginx | |
| ###################################################### | |
| # Local configuration for a remote host # | |
| # Execute the following steps on controller machine, # | |
| # not on remote host # | |
| ###################################################### | |
| # Create directory where to setup info about remote machines | |
| mkdir /usr/local/nagios/etc/servers | |
| # Open /usr/local/nagios/etc/nagios.cfg and uncomment the following line (simply remove the '#') | |
| # #cfg_dir=/usr/local/nagios/etc/servers | |
| ######################################################### | |
| # Install check_nrpe on nagios server # | |
| # use nrpe only for old servers when you canno use ncpa # | |
| ######################################################### | |
| # prereq | |
| apt-get install -y autoconf automake gcc libc6 libmcrypt-dev make libssl-dev wget | |
| cd /tmp | |
| wget --no-check-certificate -O nrpe.tar.gz https://github.com/NagiosEnterprises/nrpe/archive/nrpe-4.0.3.tar.gz | |
| tar xzf nrpe.tar.gz | |
| rm nrpe.tar.gz | |
| cd nrpe-nrpe-4.0.3/ | |
| ./configure --enable-command-args | |
| make all | |
| make install | |
| make install-config | |
| ######################################################### | |
| # Install check_ncpa on nagios server # | |
| ######################################################### | |
| cd /usr/local/nagios/libexec# | |
| wget https://raw.githubusercontent.com/NagiosEnterprises/ncpa/master/client/check_ncpa.py | |
| chmo ugo+x check_ncpa.py | |
| ######################################################## | |
| # Install SendEmail perl script to send notifications # | |
| # Execute on controller, not on remote hosts # | |
| ######################################################## | |
| # Install | |
| # - Please be aure to install sendemail (note that 'e') | |
| # and not sendmail !!!! | |
| apt install sendemail | |
| # Open /usr/local/nagios/etc/resource.cfg | |
| # Add following lines (without '#') | |
| # | |
| # from | |
| # $USER5$=from@domain.tld | |
| # smtp user | |
| # $USER7$=smtpuser@smtpdomain.it | |
| # smtp password | |
| # $USER8$=your|Smtp|Password! | |
| # smtp server and port | |
| # $USER9$=smtp.smtpdomain.tld:25 | |
| # Edit /usr/local/nagios/etc/objects/commands.cfg | |
| # Replace the following 2 command definition | |
| # Verified the use of sendemail switch and appropriate $USERx$ variabile number | |
| # -s the smtp ($USER9$ in my case) | |
| # -xu the smtp username ($USER7$) | |
| # -xp the smatp password ($USER8$) | |
| # -t the 'to' address (leave $CONTACTEMAIL$ untouched) | |
| # -f the 'from' address ($USER5$) | |
| # -u email title, the subject | |
| # 'notify-host-by-email' command definition | |
| define command { | |
| command_name notify-host-by-email | |
| command_line /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /usr/bin/sendemail -s $USER9$ -xu $USER7$ -xp $USER8$ -t $CONTACTEMAIL$ -f $USER5$ -l /var/log/sendEmail -u "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" -m "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | |
| } | |
| # 'notify-service-by-email' command definition | |
| define command { | |
| command_name notify-service-by-email | |
| command_line /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$" | /usr/bin/sendemail -s $USER9$ -xu $USER7$ -xp $USER8$ -t $CONTACTEMAIL$ -f $USER5$ -l /var/log/sendEmail -u "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" -m "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$" | |
| } | |
| # Edit nagios contacts | |
| # /usr/local/nagios/etc/objects/contacts.cfg | |
| # and change the email | |
| email receiver_of_nagios_notifications@domain.tld ; <<***** CHANGE THIS TO EMAIL ADDRESS WHICH MUST RECEIVED NOTIFICATIONS ****** | |
| # Always test before apply changes ! | |
| cd /usr/local/nagios | |
| bin/nagios -v etc/nagios.cfg | |
| # Restart service | |
| systemctl restart nagios | |