Managing events with Nagios Event Broker

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The parameters below are managed nagios event broker options Nagios but not in Shinken because they are useless in the architecture.

If you nagios event broker options need one of them, please use Nagios instead or send us a patch: The title is quite ambiguous: By setting this value to -1Nagios will check for external commands as often as possible.

Nagios event broker options time Nagios checks for external commands it will read and process all commands present in the External Command File before continuing on with its other duties. More information on external commands can be found here. This option determines how many buffer slots Nagios will reserve for caching external commands that have been read from the external command file by a worker thread, but have not yet been processed by the main thread of the Nagios deamon.

Each slot can hold one external nagios event broker options, so this option essentially determines how many commands can be buffered. For installations where you process a large number of passive checks e.

This setting determines whether or not Nagios will set various program-wide state variables based on the values saved in the retention file. If you do not have State Nagios event broker options Option enabled, this option has no effect. This setting determines whether or not Nagios will retain scheduling info next check times for hosts and services when it restarts.

If you are adding a large number or percentage of hosts and services, I would recommend disabling this option when you first restart Nagios, as it can adversely skew the spread of initial checks. Otherwise you will probably want to leave it enabled. This is an advanced feature. These options determine which host or service attributes are NOT retained across program restarts.

By default, all host and service attributes are retained. These options determine which process attributes are NOT retained across program restarts.

There are two masks because there are often separate host and service process attributes that can be changed. For example, host checks can be disabled at the program nagios event broker options, while service checks are still enabled.

Nagios event broker options default, all process attributes are retained. These options determine which contact attributes are NOT retained across program restarts. There are two masks because there are often separate host and service contact attributes that can be changed.

Using no delay is generally not recommended, as it nagios event broker options cause all service checks to be scheduled for execution at the same time. This means that you will generally have large CPU spikes when the services are all executed in parallel. More information on how to estimate how the inter-check delay affects service check scheduling can be found here.

Values are as follows:. This is the number of seconds that Nagios will sleep before checking to see if the next service or host check in the scheduling queue should be executed.

This variable determines how service checks are interleaved. Interleaving allows for a more even nagios event broker options of service checks, reduced load on remote hosts, and faster overall detection of host problems.

Setting this value to 1 is equivalent to not interleaving the service checks this is how versions of Nagios previous to 0. Set this value to s smart for automatic calculation of the interleave factor unless you have a specific nagios event broker options to change it.

The best way to understand how interleaving works is to watch the status CGI detailed view when Nagios is just starting. You should see that the service check results are spread out as they begin to appear. More information on how interleaving works can be found here.

This option allows you to specify the maximum number of service checks that can be run in parallel at any given time. Specifying a value of 1 for this variable essentially prevents any service checks from being run in parallel.

Specifying a value of 0 the default does not place any restrictions on the nagios event broker options of concurrent checks. More information on how to estimate how many concurrent checks you should allow can be found here. These events consitute the core of the monitoring logic in Nagios. If there are a lot of results to process, reaper events nagios event broker options take a long time to finish, which might delay timely execution of new host and service checks.

This variable allows you to limit the amount of time that an individual reaper event will run before it hands control back over to Nagios for other portions of the monitoring logic.

This options determines which directory Nagios will use to temporarily store host and service check nagios event broker options before they are processed. This directory should not be used to store any other files, as Nagios will periodically clean this directory of old file see the: Max Check Result File Age option above for more information.

Make sure that only a single instance of Nagios has access to the check result path. If multiple instances of Nagios have their check result path set to the same directory, you will run into problems with check results being processed incorrectly by the wrong instance of Nagios event broker options Check result files that are older that this threshold will be deleted by Nagios and the check results they contain will not be processed.

Using no delay is generally not recommended. Using no delay will cause all host checks to be scheduled for execution at the nagios event broker options time.

More information on how to estimate how the inter-check delay affects host check scheduling can be found here. This can help to balance the load on the monitoring server, as it will attempt to keep the time between consecutive checks consistent, at the expense of executing checks on a more rigid schedule.

This option determines how often in seconds Nagios will attempt to automatically reschedule checks. This option only has an effect if the Auto-Rescheduling Option option is enabled.

Default is 30 seconds. Only host and service checks that occur in the next X seconds determined by this variable will be rescheduled. Default is seconds 3 minutes. Nagios tries to be smart about how and when it checks the status of hosts. In general, disabling this option will allow Nagios to nagios event broker options some nagios event broker options decisions and check hosts a bit faster. Enabling this option will increase the amount of time required to check hosts, but may improve reliability a bit.

Unless you have problems with Nagios event broker options not recognizing that a host recovered, I would suggest not enabling this option.

This can be very useful in distributed and failover monitoring installations. More information on passive check state translation can be found here. This option determines whether or not Nagios will free memory in child processes when they are fork ed off from the main nagios event broker options. By nagios event broker options, Nagios frees memory. By defining this option in your configuration file, you are able to override things to get the behavior you want.

This option determines whether or not Nagios will fork child processes twice when it executes host and service checks. By default, Nagios fork s twice.

This option controls what if any data gets sent to the event broker and, in turn, to any loaded event broker modules. This is an advanced nagios event broker options. When in doubt, either broker nothing if not using event broker modules or broker everything if using event broker modules. Possible values are shown below.

This directive is used to specify an event broker module that should by loaded by Nagios at startup. Use multiple directives if you want to load more than one module. Arguments that should be passed to the module at startup are seperated from the module path by a space. This option determines where Nagios should write debugging information. What if any information is written is determined by the Debug Level and Debug Verbosity options.

You can have Nagios automaticaly rotate the debug file when it reaches a certain size by using the Maximum Debug File Size option. This option determines what type of information Nagios should write to the Debug File.

This value is a logical OR of the values below. This option determines how much debugging information Nagios should write to the Debug File. This option determines the maximum size in bytes of the debug file. If the file grows larger than this size, it will be renamed with a. If a file already exists with a. Note The title is quite ambiguous: Values are as follows: An interleave factor of 1 is equivalent to not interleaving the service checks. Shutdown Nagios, replace the module file, restart Nagios While Nagios is running Read the Docs v:

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The Nagios enterprise monitoring tool generates a variety of events. The principal events generated are the results You forgot to provide an Email Address. This email address is already registered. You have exceeded the maximum character limit. Please provide a Corporate E-mail Address. Please check the box if you want to proceed.

Also generated is performance data and notification events such as outages and downtime. There are a number of ways to integrate and utilize these events. NEB uses callback routines that are executed when events occur in the Nagios server. Using NEB you can write broker modules that can process these events. NEB allows you to output and integrate events into a variety of tools including MySQL databases, SNMP traps, syslog messages or use the event data in a variety of other applications and tools.

NEB uses shared code libraries called modules that are hooked into the Nagios server when it is executed. Each module can register callback procedures that are able to receive and process events. When an event occurs, NEB checks for the presence of a registered callback and, if detected, sends the event to the module. The module receives the event and performs whatever actions are coded into it.

You can see a full list of the callbacks in the nebcallbacks. NEB should be enabled by default when you compile Nagios unless you disable it. If you want to ensure that NEB gets compiled then specify the --enable-neb configure option when configuring Nagios. This line would load a module called testmodule. You can also specify a configuration file for a module like so:. You can see an example of a module in the Nagios package.

Located in the module directory off the root of the package is the helloworld module. You can create it by compiling the helloworld. Restart Nagios and the module is now loaded.

The Helloworld module is extremely simple. Helloworld logs a message to the default Nagios log file when Nagios is started and stopped and when aggregated status updates start and finish. The message looks like:. There are not a lot of NEB modules available, so far. It should provide together with the helloworld module a good introduction to NEB and help you get started on writing your own modules.

There is not a lot of documentation available for NEB thus far. You can also review the Nagios source code relevant to NEB, particularly the include files. As always the Nagios development and user mailing lists are good starting places for assistance. Encryption, speed push the modern mainframe into the future.

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