![\"01\"](\"http:\/\/www.confianzit.com\/cit-blog\/wp-content\/uploads\/2014\/03\/01.png\")
<\/a><\/div>\n\u00a0Enter the nagiosadmin password and complete the installation process.<\/p>\n
There are a couple of directories containing Nagios configuration and check files.<\/p>\n \/etc\/nagios3: contains configuration files for the operation of the nagios daemon, CGI files, hosts, etc.<\/p>\n<\/li>\n \/etc\/nagios-plugins: houses configuration files for the service checks.<\/p>\n<\/li>\n<\/ul>\n \/etc\/nagios: on the remote host contains the nagios-nrpe-server configuration files.<\/p>\n<\/li>\n \/usr\/lib\/nagios\/plugins\/: where the check binaries are stored. To see the options of a check use the -h option.<\/p>\n<\/li>\n<\/ul>\n For example: \/usr\/lib\/nagios\/plugins\/check_dhcp -h<\/p>\n After successful installation, there will be a localhost.cfg file in \/etc\/nagios3\/ \u00a0that will be monitoring \u00a0disk space, number of user etc, in the system. It can be viewed by logging into \u00a0the web interface of nagios.The following url can be used to log in to nagios web interface, the user name will be nagiosadmin and the password is the one entered during installation<\/p>\n Configuring Nagios for checking processes \u00a0that need to be monitored.<\/p>\n \/usr\/lib\/nagios\/plugins contains binaries which can be used to for figuring out process checks. For example:<\/p>\n Here is how to check if \u201capache\u201d \u00a0is running or not<\/p>\n \/usr\/lib\/nagios\/plugins\/check_procs -c 1: -C apache2<\/p>\n In the above command Here is another example to check CPU: nagios will indicate warning if the % cpu \u00a0utilized by any process is greater than 70% and will indicate \u00a0critical alert if the % cpu is greater that 80%<\/p>\n \/usr\/lib\/nagios\/plugins\/check_procs -w 70 -c 80 -m CPU -t 20<\/p>\n \u00a0<\/b><\/b>In the above command,<\/p>\n -w = Generate warning state if metric is outside this range Once the process checks are figured out , it will be added to \/etc\/nagios-plugin\/config . The above defined commands are updated accordingly in the file<\/p>\n For example<\/p>\n Edit \u00a0proc.cfg(in this case) in \/etc\/nagios-plugin\/config \u00a0to define a customized \u00a0command \u00a0and add the following for the process check we described above. Save proc.cfg.<\/p>\n define command{ define command{ $ARGx$ indicates the arguments that we pass for checking using the command_name<\/p>\n Once the customised \u00a0commands are updated in the \/etc\/nagios-plugin\/config, edit \/etc\/nagios3\/config\/localhost.cfg \u00a0and create check for the processes.<\/p>\n Add the following lines in localhost.cfg for checking apache and cpu<\/p>\n define service{ define service{ Save the file and restart nagios. <\/b><\/p>\n \u00a0<\/b><\/b>Nagios can be restarted using the following command<\/p>\n \/etc\/init.d\/nagios3 restart<\/p>\n Configuring Nagios to send email notifications<\/p>\n Edit \/etc\/nagios3\/conf.d\/contact.cfg to \u00a0add a contact \u00a0and define it contact group. Restart Nagios<\/p>\n For example\u00a0<\/b><\/b><\/p>\n define contact{ define contactgroup{<\/a><\/p>\n\n
\n
http:\/\/ip-of-server\/nagios3<\/b><\/p>\n<\/a><\/div>\n
<\/b><\/b><\/p>\n
-c = Generate critical state if metric is outside this range-C = Only scan for exact matches of COMMAND<\/p>\n<\/a><\/p>\n<\/div>\n
-c = Generate critical state if metric is outside this range
-m = Check thresholds against metric
-t = Seconds before connection times out<\/p>\n
command_name check_service
command_line \/usr\/lib\/nagios\/plugins\/check_procs -c 1: -C ‘$ARG1$’
}<\/p>\n
command_name check_cpu
command_line \/usr\/lib\/nagios\/plugins\/check_procs -w ‘$ARG1$’ -c ‘$ARG2$’ -m CPU -t 20
}<\/p>\n<\/a><\/div>\n
use generic-service ; Name of service template to use
host_name localhost
service_description CPU
check_command check_cpu!70!80
}<\/p>\n
use generic-service ; Name of service template to use
host_name localhost
service_description Apache
check_command check_service!apache2
}<\/p>\n<\/div>\n<\/a><\/p>\n
<\/b>Once we opt nagios for restart, the above process checks will be shown in the web\u00a0interface<\/p>\n<\/a><\/p>\n
contact_name rahul
alias Rahul
service_notification_period 24×7
host_notification_period 24×7
service_notification_options w,u,c,r
host_notification_options d,r
service_notification_commands notify-service-by-email
host_notification_commands notify-host-by-email
email rahul.nair@confianzit.biz
}<\/p>\n
contactgroup_name admins
alias Nagios Administrators
members rahul
}<\/p>\n<\/a><\/div>\n