Configuring Nagios ( My Os is Ubuntu ) Before configuring nagios server configure the server as mail server/relay server A. INSTALLATION 1) Download Source in /usr/local/src/ wget http://liquidtelecom.dl.sourceforge.net/project/nagios/nagios-4.x/nagios-4.2.3/nagios-4.2.3.tar.gz wget --no-check-certificate https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz tar -zxvf nagios-plugins-2.1.4.tar.gz 2) Add user and group useradd nagios groupadd nagcmd usermod -a -G nagcmd nagios usermod -a -G nagios,nagcmd www-data (* for centos this will be usermod -a -G nagios,nagcmd apache) 3) Configurating and compiling source code nagios core: tar -zxvf nagios-4.2.3.tar.gz tar -zxvf nagios-plugins-2.1.4.tar.gz cd nagios-4.2.3 install packages apt-get install snmp apt-get install snmpd apt-get install mrtg (*for centos net-snmp-5.3.2.2-22.el5_10.1 net-snmp-libs-5.3.2.2-22.el5_10.1) ./configure --with-command-group=nagcmd --with-mail=/usr/bin/sendmail –with-httpd-conf=/etc/apache2/sites-available/ (* for centos this will be ./configure --with-command-group=nagcmd ) make all make install make install-init make install-config make install-commandmode make install-webconf cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/ chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg 4) configuring Apache sudo a2ensite nagios sudo a2enmod rewrite cgi ( enable mod rewrite in httpd for centos) service apache2 reload / restart (* for centos it will be /etc/init.d/httpd restart /reload) /etc/init.d/nagios start htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin 5) Configurating and compiling source code nagios plugins cd ../nagios-plugins-2.1.4/ ./configure --with-nagios-user=nagios --with-nagios-group=nagios make make install sudo update-rc.d nagios defaults (* for centos it will be chkconfig --add nagios chkconfig --level 35 nagios on ) B. CONFIGURATION On Client apt-get install libmysqlclient*-dev ( for check_mysql plugin its required ) mysql51-mysql-libs.x86_64 ( for centos) useradd nagios groupadd nagcmd usermod -a -G nagcmd nagios cd /usr/local/src wget --no-check-certificate https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz tar -zxvf nagios-plugins-2.1.4.tar.gz cd nagios-plugins-2.1.4 ./configure --with-nagios-user=nagios --with-nagios-group=nagios make make install On Server su nagios ssh-keygen copy the content of the file id_rsa.pub to the file /home/nagios/.ssh/authorized_keys cd /usr/local/nagios/etc/objects (write your own commands for remote servers which we are going to monitor via ssh agent. ) vi remote-commands.cfg ( for example see my remote-commands.cfg at the end of the document.) cd /usr/local/nagios/etc vi nagios.cfg and add the below line cfg_file=/usr/local/nagios/etc/objects/remote-eommands.cfg cd /usr/local/nagios/etc/objects vi hostgroups.cfg ( create your hostgroups. In localhost.cfg you can find how hostgrup is written. Sample files are at the end of the document ) cd /usr/local/nagios/etc vi nagios.cfg and add the below line cfg_file=/usr/local/nagios/etc/objects/hostgroups.cfg mkdir /usr/local/nagios/etc/objects/{Linux-Workstations,Windows-Workstations,Laptops,DRBL-Workstations,Local-Servers,Remote-Servers) cd /usr/local/nagios/etc vi nagios.cfg and add the below lines cfg_dir=/usr/local/nagios/etc/objects/Local-Servers cfg_dir=/usr/local/nagios/etc/objects/Linux-Workstations cfg_dir=/usr/local/nagios/etc/objects/Windows-Workstations cfg_dir=/usr/local/nagios/etc/objects/Laptops cfg_dir=/usr/local/nagios/etc/objects/Remote-Servers copy the localhost.cfg to /usr/local/nagios/etc/objects/Linux-Workstations/<system-to-monitor-ip>.cfg ( for example I have 192.168.100.199 ip so i copied file as 192.168.100.199.cfg) vim 192.168.100.199.cfg remove all hostgroup entries and make the changes accordingly For remote system monitoring write the file /usr/local/nagios/etc/objects/remote-commands.cfg like below define command{ command_name check_remote_disk # command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_disk -w $ARG1$ -c $ARG2$ -e' command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_disk -w $ARG2$ -c $ARG3$ -A -I "/run/*" -I "/sys/*" -I "/dev/shm" -I "/dev" -I "/lib/*" -I "/var/lock" -I "/Thecus/*"' } define command{ command_name check_remote_load command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_load -w $ARG2$ -c $ARG3$' } define command{ command_name check_remote_swap command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_swap -w $ARG2$ -c $ARG3$' } define command{ command_name check_remote_users command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_users -w $ARG2$ -c $ARG3$' } define command{ command_name check_remote_procs command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_procs -w $ARG2$ -c $ARG3$' } define command{ command_name check_remote_ssh command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ssh -H $HOSTADDRESS$ $ARG1$' } #define command{ # command_name check_remote_mysql # command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_mysql -H $HOSTADDRESS$ $ARG1$' #} define command{ command_name check_remote_pgsql command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_pgsql -H $HOSTADDRESS$ -l $ARG2$ -p $ARG3$' } define command{ command_name check_remote_http command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_http -H $HOSTADDRESS$' } define command{ command_name check_remote_ldap command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ldap -H $HOSTADDRESS$ $ARG1' } define command{ command_name show_remote_users command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/show_users' } define command{ command_name check_remote_mysql command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_mysql -u $ARG2$ -p $ARG3$' } define command{ command_name check_remote_asterisk command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_asterisk' } define command{ command_name check_remote_ping command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5' } define command{ command_name show_logged_users command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $ARG2$ -C '/usr/local/nagios/libexec/logged_users' } For host write files like given (sample configuration geekonline.cfg ) define host{ use remote-linux-server ; Name of host template to use ; This host definition will inherit all variables that are defined ; in (or inherited by) the linux-server host template definition. host_name GEEKHOST alias GeekHost address 23.250.32.8 } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description PING check_command check_remote_ping!22!100.0,20%!500.0,60% } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description Partitions check_command check_remote_disk!22!20%!10%!/ } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description Current Users check_command check_remote_users!22!20!50 } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description Total Processes check_command check_remote_procs!22!250!400!RSZDT } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description Current Load check_command check_remote_load!22!5.0,4.0,3.0!10.0,6.0,4.0 } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description Swap Usage check_command check_remote_swap!22!20!10 } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description SSH check_command check_ssh notifications_enabled 0 } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description Logged in Users check_command show_remote_users!22! notifications_enabled 0 } define service{ use local-service ; Name of service template to use host_name GEEKHOST service_description MYSQL check_command check_remote_mysql!22!root!<rootPassword> notifications_enabled 0 }p /etc/init.d/nagios/restart http://<ip>/nagios
Hi there, the whole thing is going perfectly here and ofcourse every one is sharing data, that’s truly excellent, keep up writing.