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Sometimes we need to monitoring public area services, such as http, ftp. We can not install the client side agent on the public server, anyway, we can monitoring the status of them by some plugins.

 

Http service

1.  Define the check_http command

# 'check_http' command definition
define command{
        command_name    check_http
        command_line    $USER1$/check_http -H $HOSTADDRESS$ $ARG1$
        }

2. create a host configuration file for the webserver

cd /usr/local/nagios/etc/objects/

then create a configuration file for your webserver, I name it as test.cfg, the usl of the website is www.test.com

define host {
    use         linux-server        ; Inherit default values from a template
    host_name   test          ; The name we're giving to this host
    alias       test    ; A longer name associated with the host
    address     xxx.xxx.xxx.xxx ; IP address of the host
}
Http

 

define service {
    use                 generic-service     ; Inherit default values from a template
    host_name           test
    service_description HTTP
    check_command       check_http!www.test.com
}

If you also want to test the sub pages, eg. www.test.com/news/, use switch -u

define service {
    use                 generic-service     ; Inherit default values from a template
    host_name           au123
    service_description news
    check_command       check_http!www.test.com -u http://www.test.com/news/
}
Https

To monitor the https service, add -S switch.

check_command       check_http!www.test.com -S

Check service on different port

Use switch -p port_number

Certificate validation

You can check whether a SSL certificate of the website expires within the next X number of days with switch -C.

check_http -H google.com -C 200

The result will be either Ok or warning.

3. Let the nagios load the configuration file

vi /usr/local/nagios/etc/nagios.cfg

Then add following lines:

# Definitions for monitoring website
cfg_file=/usr/local/nagios/etc/objects/test.cfg
Reference

https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/monitoring-publicservices.html

5 Nagios check_http Plugin Examples for HTTP / HTTPS