Nagios Monitoring

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Nagios configuration

In GroundWork Monitor, the Configuration > Nagios Monitoring menu item, is devoted to configuring and managing Nagios monitored elements. This page is an overview of the configuration tool, for specific component configuration see How to configure Nagios monitoring.

This configuration application, also referred to as Monarch (Monitor Architect), is a full-featured, easy-to-use web based system for use with Nagios. Monarch consists of a set of tools that allow a user to easily configure and maintain Nagios monitored elements. Monarch provides a user interface versus a command line text editor to configure the monitoring system for each monitored application, service, device, etc.

For current Nagios users, Monarch writes and reads Nagios configuration files, enabling it to be easily integrated into an existing installation. You can simply install the package and import your existing configuration. Experienced Nagios users can edit the Nagios configuration files and use Monarch interchangeably. 

Architectural view of Monarch configuration

Nagios configuration is a set of .cgi scripts written in Perl. When performing a configuration Import from file operation all of the Nagios configuration files get updated in the embedded monarch database, mirroring the entire configuration in the database. Configuration then operates by manipulating this database. In addition to the Nagios configuration information there are extra data structures that configuration uses to add functionality, such as; host and service profiles, escalation trees, and configuration access rights.

Once you are finished making modifications, you can execute the Pre Flight Test, equivalent of the Nagios -v command, to provide options for controlling your production configuration. This will verify the configuration and will write the updated Nagios configuration files into a Workspace Directory. At this point your current Nagios configuration has not been affected providing you the opportunity to view and manually manipulate the configuration files.

Configuration also gives you the capability to commit the files into your production configuration (nagios/etc directory) and also initiates an automatic backup in a separate backup directory. A Commit operation performs a Nagios restart, activating the configuration. 

configuration architecture

Configuration concepts

Host and service templates

Host templates and service templates store common object properties that are used to define multiple hosts and services. Templates are used to reduce the number of repetitive entries when defining objects.

Example: When defining a new host you would first create a host template with common properties. Then, to define a specific host, you apply the properties using a host template. You would define a new service in the same way, starting with a service template and applying the template to the service definition. GroundWork Monitor provides several host and service templates.

host and service templates

Hosts and services

A service configuration is a combination of a service template and a service definition. A service is generic until it has been applied to a specific host. A host, when fully implemented, has a host template, a unique host definition, and services.

hosts and services

Service and host profiles

A service profile is a collection of multiple services. Configuration uses device-specific profiles that contain both pre-defined and user-definable monitoring parameter settings. Using profiles administrators can quickly configure GroundWork Monitor to monitor groups of similar devices and benefit from GroundWork's deep expertise in monitoring design recommended practices.

Example: You have 50 web servers on which you will want to monitor CPU, memory, disk, http, and apache processes. Instead of creating 50 definitions you would create a service definition for each service including CPU, memory, disk, etc. You can then create a service profile called web monitoring and include all of the services. You would then associate this service profile with each of the 50 web servers. Configuration does this with a host profile.

Once you have a service profile defined you can combine it with a host template and create a host profile. These profiles are not associated with a specific host. Once you have the host profile you can apply this combined definition to each of your 50 specific web servers. This concept will allow you to generically define the different roles of the different devices you are monitoring and easily apply them. So, once the above steps are complete, if you want to change one of the parameters and apply it to all 50 of your web servers, you can make a change to either the host profile, the service profile, or in the service, which will then be applied to all 50 web servers.

service and host profiles

Configuration UI

From the main menu in GroundWork Monitor, by selecting ConfigurationNagios Monitoring, you will see a list of configuration options:

ControlThe Control menu item includes options used in Configuration administration, setup, and for controlling implementation.· Setup
· Nagios CGI Configuration
· Nagios Main Configuration
· Nagios Resource Macros
· Pre Flight Test
· Commit
· Build Externals
GroupsThe Groups option is used to split hosts into different Nagios configuration files. In their most complex implementation they extend the configuration to Multiple Instances of Nagios. Groups can also determine group macro values applied to service checks.· New
· Groups
· Macros
· Build Instances
HostsThe Hosts option is used to define, manage, and delete hosts, a physical server, workstation, device, etc. that resides on your network. Host definitions are used in host groups, and profiles. Add generic services to hosts to create host services; delete host services. Arrange hosts into host groups. Manage other host-related objects.· Host Wizard
· Clone Host
· Delete Hosts
· Delete Host Services
· Search Hosts
· Hosts
· Host Groups
· Parent Child
· Host Templates
· Host Dependencies
· Host Extended Info
· Search Host Externals
· Host Externals
ServicesServices is used to define and manage services which run on hosts or some other type of metric associated with a host. Service definitions are used in host and service templates, and profiles.· New Service
· Clone Service
· Search Services
· Services
· Service Groups
· Service Templates
· Service Dependencies
· Service Extended Info
· Search service externals
· Service externals
ProfilesThe Profiles option is used to define, modify, and import host and service profiles. Profiles are used to aid in the design and management of hosts and services.· Host Profiles
· Service Profiles
· Profile Importer
CommandsThe Commands option is used to define commands including service and host checks, service and host notifications, service and host event handlers. Command definitions are used in host and service templates, and profiles.· New
· Copy
· Search
· Modify
Time PeriodsThe Time Periods option is used to define a list of times during various days that are considered to be valid times for notifications and service checks. Time Period definitions are used in host and service templates, profiles, and contacts.· New
· Copy
· Modify
ContactsThe Contacts option is used to define who is to be contacted in the event of a problem on your network. Contact group definitions group one or more contacts together for the purpose of sending out alert/recovery notifications to all contacts in a contact group. Contact definitions are used in host and service templates, services, profiles, and escalations.· Contacts
· Contact Groups
· Contact Templates
EscalationsThe Escalations option is used to define host and service escalation trees. Escalations are used to escalate contact notifications for a particular service, host, or host group. An escalation tree is a grouping of multiple escalations which is then assigned to a host, host profile, host group, or a service to escalate notifications.· Escalations
· Escalation Trees

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