Which definition is correct and certainly will yes get the job done. But what for folks who afterwards plan to put a new online host? Might you find it much easier to help you identify an alternative (nearly similar) order, in just the brand new Internet protocol address altered? It is a whole lot more productive when deciding to take advantageous asset of macros becaplay with of the creating an individual universal demand instance:
and leave Nagios the responsibility to expand the built-in $HOSTADDRESS$ macro to the appropriate IP address, obtained from the host definition (see below). As you’ll remember from the previous chapter, the $USER1$ macro holds the path to the plugins directory.
As well as the of those i’ve simply seen, Nagios provides another useful macros. Delight make reference to brand new paperwork to have a detailed selection of every offered macros as well as their validity context. Below try an example band of command significance.
step 3.3 Contact definition
get in touch with objects allow you to specify people who should be notified automatically when the alert conditions are met. Contacts are first defined individually and then grouped together in contactgroup objects, for easier management.
For the first time, in the following definitions, we will refer to previously defined objects. In fact, the values of the host_notification_months and service_notification_months directives must be timeperiod objects; and the values of the host_notification_order and service_notification_demand directives must be command objects.
3.4 Host meaning
Now we have finally come to perhaps one of the most extremely important components of Nagios setup: the term brand new servers (host, workstations, gizmos, an such like.) that individuals should monitor. This may lead us to establish probably one of the most strong options that come with Nagios arrangement: . Note that, though the audience is sharing it today basic, target heredity pertains to all Nagios stuff; however, it’s from the concept of computers and you will functions as possible get the maximum benefit from it.
In reality, configuring a breeding ground means starting countless details; as well as the property value such details will normally be the exact same for almost all hosts. As opposed to object heredity, this should suggest wasting much time entering the same parameters over and over again and in the end ending up having messy, obese and you may nearly uncontrollable arrangement documents.
However, thank goodness, Nagios makes sense adequate to save loads of typing by permitting that identify special things, whoever services is going to be “inherited” by the other items without the need to write her or him. Lower 
than is a quick illustration of how a layout is made:
- every template must be assigned a label with the name directive;
- since this is not an actual host, you must tell Nagios not to it by setting the value of the sign in directive to 0; this property doesn’t get inherited and defaults to 1, so you won’t need to explicitely override it in all “children” objects;
- a layout object should be leftover , we.e. it eters.
To create an actual host object from a template, you simply have to specify the template name as the value of the use directive and make sure that all mandatory fields are either inherited or explicitely set:
Better, today let’s move from theory to train and you will identify a couple host themes for the host. Note that next you to definitely inherits in the first; that is you can easily because the Nagios allows several degrees of template items.
Hosts can optionally be grouped together with the hostgroup statement, which has no effect on monitoring, but simply allows you to display the hosts in groups in the CGIs.
step three.5 Solution meaning
Configuring the services to monitor is much like configuring hosts: object inheritance can save you a lot of typing and you can group services together with the optional servicegroup statement. Below is the definition of our service template: