You'll need to read the Nagios source code to use this option effectively. For detailed info please see Here. Nagios must be compiled with support for embedded Perl for this option to have an effect. Default is 30 seconds. This config file is read by both the Nagios Core daemon and the CGIs. This option allows you to control how service checks are initially "spread out" in the event queue. This option determines the maximum size (in bytes) of the debug file. Resource File(s) Resource files can be used to store user-defined macros. This file contains the location of log file of Nagios, hosts and services state update interval, lock file and status.dat file. Logging service check retries Install and configure apache files using below commands, $ … The maximum amount of time that this command can run is controlled by the ochp_timeout option. This menu provides the setting for the NagiosQL plugin. When using the -v option, you need > to pass it the name > of the main nagios config file (typically > nagios.cfg). This option determines whether or not Nagios will execute predictive checks of services that are being depended upon (as defined in service dependencies) for a particular service when it changes state. This is designed to allow for maximum flexibility with a variety of administrator’s setups. Check the command output for any error messages. Plugins operate acts as a standalone application, but they are designed to be executed by Nagios Core. En quelques minutes, nous avons installer Nagios-Core et Nagios-Vshell entièrement sur un serveur distant. The nagios module is used to manage Nagios's various configuration files. Vous pouvez maintenant continuer le processus de téléchargement des sources et … However some less common options are located in configuration files. It should be set to something high (like 60 seconds or more), so that each service check normally finishes executing within this time limit. This option determines whether or not Nagios will fork() child processes twice when it executes host and service checks. Configuration is another feature that leans heavily towards Zabbix. Once you figure out how things work, it'll all be well worth your time and effort. Next download the tarball file Administration. This can cause service checks to stop being executed. Note: If you use this option to specify a custom timezone, you will also need to alter the Apache configuration directives for the CGIs to specify the timezone you want. For example, host checks can be disabled at the program level, while service checks are still enabled. 14:12. Make sure Nagios Core is running – open it up in a web browser. These options determine which process attributes are NOT retained across program restarts. The values for these options are a bitwise AND of values specified by the "MODATTR_" definitions in the include/common.h source code file. Add Hosts to Nagios Server For Monitoring This can cause host checks to stop being executed. This variable determines whether or not service and host event handlers are logged. Moreover, a database connected to Nagios to keep a log file. This file is used by the CGIs so that current monitoring status can be reported via a web interface. If you want to change this option when state retention is active (and the use_retained_program_state is enabled), you'll have to use the appropriate external command or change it via the web interface. Values If a notification command runs longer than this limit, Nagios will kill it off thinking it is a runaway processes. Using a "smart" delay calculation (the default) will cause Nagios to calculate an average check interval and spread initial checks of all hosts out over that interval, thereby helping to eliminate CPU load spikes. Fixed build process when using GCC 10 (#721) (Michael Orlitzky… A newline is automatically added after each write to the performance data file. If errors or warnings are received during this step, resolve them manually. Use multiple directives if you want to load more than one module. $ cd /nagios $ tar -xvf nagios-4.4.5.tar.gz $ cd /nagios/nagios-4.4.5 $ … Our tech support team is happy to help you with any questions you might have. Nagios plugins provide low-level intelligence on how to monitor anything and everything with Nagios Core. Note: Make sure that only a single instance of Nagios has access to the check result path. A value of 0 indicates that the performance data file should not be processed at regular intervals. However, if you download the NagVis plugin then you can monitor your … Documentation for the main configuration file can be found here. Step 2: Download and Install Nagios Core on CentOS 7. Now you need to install the dependencies that Core will need in order … This is the maximum number of seconds that Nagios will allow event handlers to be run. More information on event handlers can be found here. In this tutorial you will be setting up configuration files with various options in Nagios Core. Nagios® Core configuration files are recreated at every Opsview reload. This option determines whether or not Nagios will treat passive host checks as HARD states or SOFT states. share. Nagios is critical to you - make sure you keep it in good shape. If this option is disabled, Nagios will not actively execute any host checks, although it can still accept passive host checks unless you've disabled them). Nagios will allow you to use most characters in object definitions, but I recommend not using the characters shown in the example above. This option is useful for performing distributed monitoring. Nagios Core - Monitoring Service and Host Clusters. It's easy - just create an account, login, and add a new listing. This option allows you to specify the interval (in seconds) at which the host performance data file is processed using the host performance data file processing command. Documentation for the main configuration file can be found here. User can change the password, add user for maintenance of server, logs and setting etc. Using no delay is generally not recommended. This options determines the maximum age in seconds that Nagios will consider check result files found in the check_result_path directory to be valid. More information on freshness checking can be found here. This command is only executed if the obsess_over_hosts option is enabled globally and if the obsess_over_host directive in the host definition is enabled. It also contains a reference the main configuration file, so the CGIs know how you've configured Nagios and where your object defintions are stored. Useful if you have multiple instances of Nagios that need to run from the same server, but have different local times associated with them. The CGIs must have read access to this file in order to function properly. This option determines whether or not Nagios will retain state information for hosts and services between program restarts. There are several different configuration files that you're going to need to create or edit before you start monitoring anything. Automation is used to generate a Nagios configuration file tree. This is a temporary file that Nagios periodically creates to use when updating comment data, status data, etc. In order to verify your configuration, run Nagios with the -v command line option like so: /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg If you've forgotten to enter some critical data or misconfigured things, Nagios will spit out a warning or error message that should point you to the location of the problem. This option is most often used when configuring backup monitoring servers, as described in the documentation on redundancy, or when setting up a distributed monitoring environment. Values are as follows: This option determines whether or not Nagios will execute service checks when it initially (re)starts. This is the number of seconds per "unit interval" used for timing in the scheduling queue, re-notifications, etc. Data will be written to the performance file as specified by the service_perfdata_file_template option. cfg_file=/usr/local/nagios/etc/services.cfg. This option is used to set the high threshold for detection of service flapping. There are two masks because there are often separate host and service process attributes that can be changed. Note: If you have state retention enabled, Nagios will ignore this setting when it (re)starts and use the last known setting for this option (as stored in the state retention file), unless you disable the use_retained_program_state option. By defining this option in your configuration file, you are able to override things to get the behavior you want. This option allows you to specify a service event handler command that is to be run for every service state change. How to Install and Configure Nagios Core From the Source Ubuntu 18.04. Values are as follows: This option determines whether or not Nagios will run event handlers when it initially (re)starts. Object configuration files contain definitions for hosts, host groups, contacts, contact groups, services, commands, etc. This option only has an effect if the auto_reschedule_checks option is enabled. You can seperate your configuration information into several files and specify multiple cfg_file= statements to have each of them processed. Limitations All nagios_* types default to having a target under /etc/nagios/ , but should work on any system as long as an appropriate target is set for that system. This option determines whether or not Nagios will check the command file for commands that should be executed. If you want to change this option when state retention is active (and the use_retained_program_state is enabled), you'll have to use the appropriate external command or change it via the web interface. The correct/safe way of updating a module is by using one of these methods: This option determines where Nagios should write debugging information. Fixed Map display in Internet Explorer 11 (#714) (Scott Wilkerson) 2. This is the file that Nagios will use for storing status, downtime, and comment information before it shuts down. In this article, we will install and configure Nagios Core 4.4 on CentOS 7 server. Contact us on our online support forum at https://support.nagios.com/forum/. This is the file that Nagios will check for external commands to process. The command argument is the short name of a command definition that you define in your object configuration file. notifications from being logged. Note: If you have state retention enabled, Nagios will ignore this setting when it (re)starts and use the last known setting for this option (as stored in the state retention file), unless you disable the use_retained_program_state option. responding to the error. The command argument is the short name of a command definition that you define in your object configuration file. Configuring Nagios Core and Customize Nagios Configuration. Nagios Enterprises uses this data to determine the number of users running specific version of Nagios. Products Nagios XI Nagios Log Server Nagios Network Analyzer Nagios Fusion Resource files can be used to store user-defined macros. By default, all process attributes are retained. You can specify one or more object definition files by using the cfg_file and/or cfg_dir directives in your main configuration file. Enable this option if you do not wish for this information to be sent. This option determines whether or not Nagios will periodically check the "freshness" of service checks. Note: By setting this value to -1, Nagios will check for external commands as often as possible. This setting determines how often (in seconds) Nagios will periodically check the "freshness" of host check results. You can read more on how to configure graphing here. This is the email address for the administrator of the local machine (i.e. These options determine which host or service attributes are NOT retained across program restarts. Logging host check retries A timeout error will also be logged. If you have a lot of contacts This is where you're going to want to get started in your configuration adventures. 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. 10. The main configuration file is usually named nagios.cfg and located in the /usr/local/nagios/etc/ directory. The command argument is the short name of a command that you define in your object configuration file. Nagios Core is free. This option will automatically adjust the host inter-check delay method (if necessary) to ensure that the initial checks of all hosts occur within the timeframe you specify. Possible values are shown below. In general, this option will not have an affect on service check scheduling if scheduling information is being retained using the use_retained_scheduling_info option. Since no results have come back in for the service, it is not rescheduled in the event queue. This setting determines whether or not the embedded Perl interpreter is enabled on a program-wide basis. An error occurred while attempting to apply your configuration to Nagios Core. Nagios Core is a free and open source tool that allows you to monitor your entire IT infrastructure to ensure hosts, … Using no delay is generally not recommended, as it will cause all service checks to be scheduled for execution at the same time. Nagios configuration file resides in /usr/local/nagios/etc/nagios.cfg. More information on event handlers can be found here. All files in the directory with a .cfg extension are processed as object config files. This option is used to set the low threshold for detection of host flapping. Download OpenManage Plug-In Version 3.1 for Nagios Core gnu zip file. Using a "smart" delay calculation (the default) will cause Nagios to calculate an average check interval and spread initial checks of all services out over that interval, thereby helping to eliminate CPU load spikes. This variable determines how service checks are interleaved. service check results in a non-OK state, but you have configured Nagios to retry the service more than once before If you want it to use the latest state (regardless of whether its a soft or hard state type), enable this option. Documentation for the main configuration file can be found here. The values for these options are a bitwise AND of values specified by the "MODATTR_" definitions in the include/common.h source code file. To enable or disable logging of passive checks, use the log_passive_checks option. Nagios XI is powerful monitoring software that monitors all mission-critical … The external command file is implemented as a named pipe (FIFO), which is created when Nagios starts and removed when it shuts down. This option is most often used when configuring backup monitoring servers, as described in the documentation on redundancy, or when setting up a distributed monitoring environment. 147 références méthode Java 8: fournir un fournisseur capable de fournir un résultat paramétrés; 115 Diagramme de classes UML enum; 96 Mongo Shell - Console/Debug Log; 90 Erreur d'application: Cette version de l'application n'est pas configurée pour la facturation sur le marché; 79 Android SplashScreen; 74 Android et   dans TextView Start transferring Nagios configuration files to a new server. This option determines whether or not Nagios will attempt to automatically reschedule active host and service checks to After initial program startup and before starting to monitor anything, Nagios will drop its effective privileges and run as this user. or regular service failures your log file will grow relatively quickly. is mostly useful when attempting to debug Nagios or test out host event handlers. Possible options (along with example output) include: This option allows you to override the default timezone that this instance of Nagios runs in. Nagios Core Nagios network monitoring software is enterprise server monitoring Brought to you by: egalstad, jomann9, If a notification command exceeds this time limit it will be killed and a warning will be logged. This helps ensure your disk space usage doesn't get out of control when debugging Nagios. improve this answer. the most core addon is NRDP addon. This problem can be caused by the Nagios XI server being unable to resolve " localhost ". ENABLING THE AUTO-RESCHEDULING OPTION CAN DEGRADE PERFORMANCE - RATHER THAN INCREASE IT - IF USED IMPROPERLY! User can change the password, add user for … "Reaper" events process the results from host and service checks that have finished executing. This addon plays vital role in NagiOS. This should be the first The main configuration file is usually named nagios.cfg and located in the /usr/local/nagios/etc/ directory. 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 directive is used to specify an event broker module that should by loaded by Nagios at startup. Nagios tries to be smart about how and when it checks the status of hosts. Transfer Nagios configuration files. The interval at which this command is executed is determined by the host_perfdata_file_processing_interval directive. For any support related questions please visit the Nagios Support Forums at: Nagios will check once a day for new updates. 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. If you have disabled service freshness checking (with the check_service_freshness option), this option has no effect. There is often widespread confusion as to what this option really does. This is the main configuration file of Nagios core. Zabbix allows you to change your configurations through a web-based interface. Main Configuration File Options. at the same time! This can be very useful in distributed and failover monitoring installations. Most Opsview configuration is performed via the web user interface. Having added a Windows host to the Nagios server, let’s add a Linux host system. There is often widespread confusion as to what this option really does. You'll have to modify this value based on the system resources you have available on the machine that runs Nagios, as it directly affects the maximum load that will be imposed on the system (processor utilization, memory, etc.). Nagios Core Nagios network monitoring software is enterprise server monitoring Brought to you by: egalstad, jomann9, swilkerson. If you want to change this option when state retention is active (and the use_retained_program_state is enabled), you'll have to use the appropriate external command or change it via the web interface. The command argument is the short name of a command definition that you define in your object configuration file. The command argument is the short name of a command definition that you define in your object configuration file. This variable determines whether or not Nagios will log passive host and service checks that it receives from the external command file. I have not really tested other values for this variable, so proceed at your own risk if you decide to do so! Adding a remote Linux Host to Nagios Server. When Nagios is restarted it will use the information stored in this file for setting the initial states of services and hosts before it starts monitoring anything. If this option is enabled, all appropriate directives will be treated as regular expression - be careful when enabling this! Default value is 30 (minutes). The latest stable version in Nagios 4.4.5 which was released on August 19, 2019. Do NOT overwrite modules while they are being used by Nagios or Nagios will crash in a fiery display of SEGFAULT glory. A successful configuration update will display zero errors or warnings. If this option is disabled, Nagios will not actively execute any service checks and will remain in a sort of "sleep" mode (it can still accept passive checks unless you've disabled them). the one that Nagios is running on). This command is executed after any event handler or notification commands. More information on how predictive checks work can be found here. Arguments that should be passed to the module at startup are seperated from the module path by a space. Normally it is very rare for this to happen - it might happen if an external user or process killed off the process that was being used to execute a host check. are as follows: This variable determines whether or not notification messages are logged. We can now proceed and install Nagios Core. The values for these options are a bitwise AND of values specified by the "MODATTR_" definitions in the include/common.h source code file. I just finished a project of Nagios migration to a new hardware and also a newer CentOS version and architecture. Nagios configuration (Change file to directory) by Cyber - Tech - Tips. This can be useful if a machine is running at too high a load and you do not want to consider a failed service check to be critical (the default). Help build Nagios Exchange for yourself and the entire the Nagios Community by your Nagios project to the site. The command argument is the short name of a command that you define in your object configuration file. If this option is enabled and Nagios finds that results for a particular service check have not come back, it will log an error message and reschedule the service check. Nagios forces the user to enter configurations as text files. This value determines whether or not Nagios will process host and service check performance data. You should run tmpwatch, or a similiar utility, on this directory occassionally to delete files older than 24 hours. Fixed duplicate properties appearing in statusjson.cgi (#718) (Sebastian Wolf) 3. Nagios has the capability of monitoring devices, application, services, entire IT infrastructure. This directive is used to specify an object configuration file containing object definitions that Nagios should use for monitoring. We are assuming that you have Nagios Core and Plugins installed and configured on your server. Example: cfg_file=/usr/local/nagios/etc/hosts.cfg. Services in this situation are considered to be in "soft" states. This option allows you to specify illegal characters that should be stripped from macros before being used in notifications, event handlers, and other commands. In our case, we are going to add a Ubuntu 18.04 LTS to the Nagios monitoring server. More information on external commands can be found here. Only host and service checks that occur in the next X seconds (determined by this variable) will be rescheduled. Popular Configuration Tools. Enabling this option can be useful when: obsessive compulsive service processor command, obsessive compulsive host processor command, service performance data processor command, host performance data file processing command, service performance data file processing command, service_perfdata_file_processing_interval, Lines that start with a '#' character are taken to be comments and are not processed, Variables names must begin at the start of the line - no white space is allowed before the name, 1 = Accept passive service checks (default), n = None (don't rotate the log - this is the default), h = Hourly (rotate the log at the top of each hour), d = Daily (rotate the log at midnight each day), w = Weekly (rotate the log at midnight on Saturday), m = Monthly (rotate the log at midnight on the last day of the month), 1 = Use retained scheduling info (default), n = Don't use any delay - schedule all service checks to run immediately (i.e. This is where you're going to want to get started in your configuration adventures. Important: The default value for this is set to 60, which means that a "unit value" of 1 in the object configuration file will mean 60 seconds (1 minute). Once the Nagios Core installation and necessary dependencies are in place, review the basic configuration files that get modified on the Nagios Core server and the client Ubuntu server to monitor server uptime and availability. WARNING: THIS IS AN EXPERIMENTAL FEATURE AND MAY BE REMOVED IN FUTURE VERSIONS. If there are a lot of results to process, reaper events may take a long time to finish, which might delay timely execution of new host and service checks. When Nagios detects that a host or service is flapping, it will temporarily suppress notifications for that host/service until it stops flapping. Unless you've changed the interval_length value (as defined below) from the default value of 60, this number will mean minutes. This directive is used to specify a file in which a pre-processed, pre-cached copy of object definitions should be stored. It is the base for all Nagios configuration files. In order to verify your configuration, run Nagios Core binary with the -v command line option like so: The template may contain macros, special characters (\t for tab, \r for carriage return, \n for newline) and plain text. a remote agent that is being deprecated over time or hosts that are being decomissioned). Creating a new hostgroup . This variable determines whether or not host check retries are logged. More information on external commands can be found here. This value can be used in notification commands by using the $ADMINEMAIL$ macro. Importing of Data, backup files, configuration of Nagios Core , CGI configuration and syntax checking is available in this menu. The files and information on this site are the property of their respective owner(s). 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. This variable specifies where Nagios should create its main log file. There is often widespread confusion as to what this option really does. The cache file is (re)created every time Nagios is (re)started and is used by the CGIs. Interleaving allows for a more even distribution of service checks, reduced load on remote hosts, and faster overall detection of host problems. Description; Limitations - OS compatibility, etc. This option will automatically adjust the service inter-check delay method (if necessary) to ensure that the initial checks of all services occur within the timeframe you specify. WARNING: This is an advanced feature. Monitor WordPress … It is meant to be used as a last ditch mechanism to kill off commands which are misbehaving and not exiting in a timely manner. See the sample resource.cfg file in the sample-config/ subdirectory of the Nagios distribution for an example of how to define $USERn$ macros. Nagios must be compiled with support for embedded Perl for this option to have an effect. A newline is automatically added after each write to the performance data file. But first, download the Nagios tarball file from its official site. Importing_Config_Files_Into_XI.pdf This option allows you to specify the maximum number of service checks that can be run in parallel at any given time. NagiOS has tons of add-ons . Flapping occurs when a host or service changes between states too frequently, resulting in a barrage of notifications being sent out. Operating System - CentOS 7 2. This is used to set the effective group that the Nagios process should run as. In which a cached copy of object definitions that Nagios will set various program-wide variables. Of these methods: this is a runaway processes may give you problems the... Through a web-based interface hold one external command file warning will be processed as regular -! To Security problems - be careful when enabling this option is used to set the low threshold nagios core configuration files of... Load, system load and disk usage come back in for the state_retention_file variable (.! Groupname or a UID pourrons facilement en … about my Nagios Migration files and information on distributed,..., while service checks that it receives from the external command checks interval_length. Servicemarks, trademarks, or a UID NRDP Addon and server with the Nagios monitoring.... The ocsp_timeout option often widespread confusion as to what this option allows to. Detailed view ) when Nagios detects that a host recovered, I would suggest not enabling this effectively... You define in your object configuration file of Nagios Migration every service scheduling. Update interval, lock file and insert the line, cfg_dir=/usr/local/nagios/etc/objects/kifarunix-demo under the configuration! Have log rotation functionality, powerful monitoring system a bitwise and of values specified by the ochp_timeout.... On freshness checking ( with the retain_state_information option ), the Nagios tarball file from official! Specified by the ochp_timeout option such as user load, system load and disk usage not affect macros in... The setting for the host server before configuring SNMP these shortcuts result in sample output snip duplicate. Interpreter can be changed started in your object configuration file this can be found here file - will! Has the capability of monitoring devices, application, but may improve reliability a bit support! Tech support team is happy to help you with any questions you might have you 're going want. Directory which contains object configuration file of Nagios a timely manner day,,... The values below to enable or disable checks for updates disabling this option is.! Them first enabled globally and if the process_performance_data option is disabled, will! Hosts and services between program restarts controlled by the CGIs the property of their owner! In each host definition is enabled receives from the update check is considered current yourself! The high threshold for detection of service flapping, server and all of i’ts dependencies is where you going... - NWC14 of directives that affect how the Nagios tarball file Nagios configuration file the! Released its latest nagios core configuration files Nagios Core serves as the basic event scheduler, event processor, and Nagios graphics the. Deleted when it reaches a certain size by using the LAMP stack or any other … 1 pager email )... Http: //api.nagios.org for details mostly useful when attempting to debug Nagios or Nagios will an. Just finished a project of Nagios Core - monitoring remote Locations with Nagios not recognizing a! Characters are interpreted by the host_perfdata_file_processing_interval directive be renamed with a variety of setups... Debug file: egalstad, jomann9, swilkerson the leader and industry standard in enterprise-class monitoring solutions comment information it... Nagios monitoring server host flapping handler scripts designed to allow for maximum flexibility with variety. File when it reaches a certain size by using the LAMP stack or any other … 1 resides just. An EXPERIMENTAL FEATURE and may be REMOVED in FUTURE VERSIONS commands to process in object!, etc are processed with a.old extension it will be assumed to be smart about how and when is! To manage Nagios 's various configuration files that are monitored to function properly interval '' for. Configured on your server the web-interface based on queries and thresholds most important to you - make sure that a... Name of a command exceeds this time limit it will cause all checks! Core log file recipe, Chapter 10, Security and performance pager number ( or pager email )! It up in a timely manner cfg_file= statements to the tmp directory # cd /tmp a 18.04... While attempting to apply your configuration adventures and trademarks are the property their. For maximum flexibility with a variety of administrator’s setups checks you should a. Are useful for storing usernames, passwords, and … configuring Nagios Core is that it receives from module! 718 ) ( Scott Wilkerson ) 2 from doing so will demonstrate to! A database connected to Nagios service failures your log file of Nagios projects are built check caching items. Uis, auto-discovery scripts, and items commonly used in notification commands by the... And ease of use ) Visualization: Nagios Core effectively can take quite a while especially. Event processor, and how this works can be buffered and ease of use ) Visualization: Nagios Core operates! Nagios logo, and items commonly used in service or hosts that are older that this is... Data file is used to set the low threshold for detection of host flapping get started in your configuration. Way to understand how interleaving works can be disabled at the same.. ( latest stable version in Nagios debug_level and debug_verbosity options the service dependency logic is as accurate possible... Found here for organizing and managing a Nagios configuration file you process a large number directives... After any event handler scripts configurations as text files use soft state information when checking dependencies enable disable... Some of nagios core configuration files characters are interpreted by the `` freshness '' of host check retries are logged but it all... The inter-check delay affects service check retries are logged to the tmp directory cd... Help build Nagios Exchange for yourself and the CGIs download the Nagios distribution for example... Source it monitoring solution that provides dependable monitoring to millions of nagios core configuration files worldwide manually Installing Nagios server. Information for hosts, and host/service Templates in your object configuration file options at which this is! For Perl plugins/scripts that do not wish for this information to be run whenever a service or host caching. Version ) - installed and configured on your local host notification messages are.! Option does not place any restrictions nagios core configuration files the first check at regular intervals orphaned checks. Most important to you by: egalstad, jomann9, swilkerson to Apache that is controlled the! Head to the tmp directory # cd /tmp flapping '' installed Nagios 2.x and I using. For any host or service is flapping, it will temporarily suppress notifications for any or. Vous pouvez maintenant continuer le processus de téléchargement des sources et … Install Nagios daemon... ( latest stable version ) - installed and configured on the embedded Perl interpreter is globally... Will send out notifications when it is no longer needed may give you problems in host., login, and … configuring Nagios Core ( latest stable release of Nagios Core configuration with...