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FEATURES Icinga Monitoring network computers with the Icinga Nagios fork Server Observer © Alterfalter, 123RF.com Icinga’s developers grew weary of waiting for updates to the popular Nagios monitoring tool, so they started their own project. By Falko Benthin A server can struggle for many reasons: System resources like the CPU, RAM, or hard disk space could be overloaded, or network services might have crashed. Depending on the applications that run on a server, consequences can be dire – from irked users to massive financial implications. Therefore, it is more important than ever in a highly networked world to be able to monitor the state of your server and take action immediately. Of course, you could check every server and service individually, but it is far more convenient to use a monitoring tool like Icinga. Nagios Fork Icinga [1] is a relatively young project that was forked from Nagios [2] because of disagreements regarding the pace and direction of development. Icinga delivers improved database connectors (for MySQL, Oracle, and PostgreSQL), a more user-friendly web interface, and an API that lets administrators integrate numerous extensions without complicated modification of the Icinga core. The Icinga developers also seek to reflect community needs more closely and to integrate patches more quickly. The first stable version, 1.0, was released in December 2009, and the version Listing 1: my_hosts.cfg 01 # Webserver 02 define host{ 03 host_name webserver 04 alias languagecenter 05 display_name Server at language center 06 address 141.20.108.124 07 active_checks_enabled 1 08 passive_checks_enabled 0 09 max_check_attempts 3 10 check_command check-host-alive 11 check_interval 5 12 retry_interval 1 13 contacts spz_admin 14 notification_period 24x7 15 notification_interval 60 16 notification_options d 17 } 18 19 # Fileserver 20 define host{ 21 host_name fileserver 22 alias Fileserver 23 display_name Fileserver 24 address 192.168.10.127 25 active_checks_enabled 1 26 passive_checks_enabled 0 27 max_check_attempts 3 28 check_command check-host-alive 29 check_interval 5 30 retry_interval 1 31 contacts admin 32 notification_period 24x7 33 notification_interval 60 34 notification_options d,u,r 35 } 14 <strong>ADMIN</strong> 01 WWW.<strong>ADMIN</strong>-MAGAZINE.COM
Icinga Features Table 1: States Option Status Server o OK d Down u Unreachable r Recovered Services o OK w Warning c Critical r Recovered u Unknown counter has risen every couple of months ever since. Icinga comprises three components: the core, the API, and the optional web interface. The core collects system health information generated by plugins and passes it via the IDOMOD interface to the Icinga Data Out Database (IDODB) or the IDO2DB service daemon. The PHP-based API accepts information from the IDODB and displays it in a web-based interface. Additionally, the API facilitates the development of add-ons and plugins. Icinga Web is designed to be a stateof-the-art web interface that is easily customized for administrators to keep an eye on the state of the systems they manage. At the time of writing, Icinga Web was in beta, and it has a couple of bugs that make it difficult to recommend for production use. If you only need to monitor a single host, Icinga is installed easily. Some Figure 1: If the hosts are healthy, the admin is happy. distributions offer binaries in their repositories, but if not, or if you prefer to use the latest version, the easy-tounderstand documentation includes a quick-start guide (for the database via libdbi with IDOUtils), which can help you set up the network monitor in next to no time for access at http:// Server/icinga. The challenges come when you want to monitor a larger number of computers. Icinga can monitor the private services on a computer, including CPU load, RAM, and disk usage, as well as public services like web, SSH, mail, and so on. The lab network environment consists of three computers, one of which acts as the Icinga server; the other two are a web server and a file server that send information to the monitoring server. Because no native approach lets you request information Listing 2: my_services.cfg (Excerpt) 01 # SERVICE DEFINITIONS 02 define service{ 03 host_name webserver 04 service_description HTTP 05 active_checks_enabled 1 06 passive_checks_enabled 0 07 check_command check_http 08 max_check_attempts 3 ;how often to perform the check before Icinga notifies 09 check_interval 5 10 retry_interval 1 11 check_period 24x7 12 contacts spz_admin 13 notifications_enabled 1 14 notification_period weekdays 15 notification_interval 60 16 notification_options w,c,u,r 17 } 18 define service{ 19 host_name fileserver, webserver 20 service_description SSH 21 active_checks_enabled 1 22 passive_checks_enabled 0 23 check_command check_ssh 24 max_check_attempts 3 25 check_interval 15 26 retry_interval 1 27 check_period 24x7 28 contacts admin 29 notifications_enabled 0 30 } www.admin-magazine.com Admin 01 15
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