#Nagios

1# Ubuntu
2sudo apt install nagios4 nagios-plugins
3
4# Access web UI
5# http://localhost/nagios4

1# /etc/nagios4/objects/hosts.cfg
2define host {
3  use                     linux-server
4  host_name               webserver
5  alias                   Web Server
6  address                 192.168.1.10
7  max_check_attempts      5
8  check_period            24x7
9  notification_interval   30
10  notification_period     24x7
11}

1define service {
2  use                     generic-service
3  host_name               webserver
4  service_description     HTTP
5  check_command           check_http
6}