Consider the following script (check_warnings.sh): Based on the information provided by the nagiostats tool, I assume everything is ok if there are five or less services in Warning state.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-medrectangle-4','ezslot_1',108,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-medrectangle-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-medrectangle-4','ezslot_2',108,'0','1'])};__ez_fad_position('div-gpt-ad-howtoforge_com-medrectangle-4-0_1');.medrectangle-4-multi-108{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. Sometimes I find it tricky figuring out exactly what a plugin is doing. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . Stop once the headers are downloaded. The output indicates that it expires in 300 days. Using the definition below, checks on the host will be performed after every 3 minutes. Define the checks on /etc/nagios/nrpe_local.cfg. They have a lot of advantages and some disadvantages. Having managed large Nagios installations for many years, assigning services to hostgroups is an anti pattern and can make things complicated fast if your environment gets big. Test Server 1: custom application (TCP Port. Last updated on September 22, 2020 by Sarmed Rahman. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. use generic-service ; Name of service template to use Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. Expected response string. To keep the article focused on service monitoring, we will not be configuring hostgroups or templates, as they have been covered in the previous tutorial. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. This increases the security of the database. . By default you do not need to change any of the lines in this file and . Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. Connect and share knowledge within a single location that is structured and easy to search. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). 2022 Company, Inc. All rights reserved. In order to make Nagios treat passive host check results in the same way as active check results, we need to enable the following option: By default, Nagios treats host results from passive checks as hard results. The basic workings of service checks are described here Services are checked by the Nagios daemon: On-demand checks are performed as part of the predictive service dependency check logic. Use Hiera. Nagios also offers a way of combining the benefits of both active and passive checks. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Find the plugin you want to run (if you're not sure, compare what you see in your plugins directory on your Linux box with the plugins located here: http://exchange.nagios.org/directory/Plugins, or try running "./plugin-name -h" to get the help info about the plugin). This usually calls for some effort. It allows to configure alerts and has different states for them. The plugin can only check if the service is started, you could however use the negate plugin to invert the returned result from the plugin (hence making "stopped" have an OK state). The plugins can be in any language, Nagios only cares They can be the following: 0: OK How Nagios process handles passive check results can be defined in the main Nagios configuration file. Try to put full path in the command line. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. These checks are scripts and progams which take input (for example, which host to check, tresholds), do a check and then return an exit code and some performance data. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. The plugin returns a CRITICAL state if the service is not started. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. It only takes a minute to sign up. However, applications on remote hosts can't do this so easily. mark separates the command from the arguments in the check_command entry. The module can only check if the service is started, you could however use the negate plugin to invert the returned result from the plugin (hence making CRITICAL an OK state). If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. The results are passed to Nagios in the same way as they are passed for hosts. As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. notifications_enabled 0 This is the main configuration file of Nagios core. In such cases, only reports regarding hard state changes are propagated across Nagios servers. Active checks are initiated by Nagios process and then run on a regular scheduled basis. In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. Yeah, it's totally brute-force, but it works for me. Learn more. Nagioshttpdgccgd. A user nagios is created for both localhost and for any host. The -S option is not working with 2.0 plugins. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. The script should then post results to the Nagios daemon. Affordable solution to train a team and make them project ready. So the Nagios Core version is 3.5.1. To turn on everything you want to set debug_level=4095. Is there a proper earth ground point in this switch box? In this way, NSCA communication sent over the Internet is more secure. NSClient++ includes a service module that can check if a service is running. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. Syntax and Options These checks help ensure that the dependency logic is as accurate as possible. Nagios comes with a wide range of built-in scripts for monitoring services. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. In general, if a check can be done quickly and does not require long running processes, it should definitely be done as an active service. Method 2. If you want know more, just read and play with: I'm new to shell and would like to understand and adapt your script would you comment on why this particular adaptation wont work (results unknown - 0 regardless of input parameter sent by the user), countWarnings=$(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5), echo "example: plugin.sh minimal_counter_for_warning_alert counter_for_critical_alert", if (($warn<=$countWarnings ||$countWarnings==0)); then, echo "OK - $countWarnings services in Warning state", elif (($warn<$countWarnings && $countWarnings<=$crit)); then, echo "WARNING - $countWarnings services in Warning state", echo "CRITICAL - $countWarnings services in Warning state", [emailprotected]:/usr/local/nagios/libexec$ echo $(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5). You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Each of these options opens the Manage Service Template screen.The New option will have no pre-selected directive values, Copy lets you create a new template based on an existing templates properties, and Modify enables the editing of an . The first thing that needs to be done in order to use passive checks for your Nagios setup is to make sure that you have the following options in your main Nagios configuration file: It would also be good to enable the logging of incoming passive checksthis makes determining the problem of not processing a passive check much easier. define service{ use generic-service host_name web1.onemetric.com.au service_description Uptime check_command snmp_Uptime!-C public } Adjust the commands as required. The Nagios server is running on Ubuntu. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. can nagios adjust its check time based on the status info? >Mainly Focus on Kafka and Cloudera services, Cluster . For example . Default is 80, This will use HTTPS using default 443 port. In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. A good example would be a server that is a part of an application, processing job queues using a database. Detecting and dealing with state changes is what Nagios is all about. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Passive Checks and NSCA (Nagios Service Check Acceptor), Technology news, insights and tutorials from Packt, Top 6 Cybersecurity Books from Packt to Accelerate Your Career, Your Quick Introduction to Extended Events in Analysis Services from Blog, Logging the history of my past SQL Saturday presentations from Blog, Storage savings with Table Compression from Blog Posts SQLServerCentral, Daily Coping 31 Dec 2020 from Blog Posts SQLServerCentral, Learning Essential Linux Commands for Navigating the Shell Effectively, Exploring the Strategy Behavioral Design Pattern in Node.js, How to integrate a Medium editor in Angular 8, Implementing memory management with Golangs garbage collector, How to create sales analysis app in Qlik Sense using DAR, http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114, ExploringForms in Angular types, benefits and differences. This plugin uses systemctl is-active command, please check you have systemd. Thank you for any assistance you can provide. As with passive checks of hosts, all that is needed is to enable the global Nagios option to accept passive check results, and also enable this option for each service that should allow the passing of passive check results. This will give an idea on whether the execution will be successful and what the output of the script will look like. How can I manually run a nagios check from the command line? 03-16-2010, 10:31 AM . This setting is done on all MySQL servers. Testing the Commands from Nagios XI Server Now we will test from the Nagios XI server that the command you just added to the NRPE client on the Linux server is working. Depending on the status received on hosts and services, appropriate action is taken. Furthermore , Nagios can also check whether TCP port 80 (web server) is reachable e.g., the server is online but Apache/IIS is not responding. The service check runs in a child process that was fork()ed from the main Nagios daemon. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. The default FQDN used for testing is www.google.com, but it can be changed as needed. This is a plugin for Nagios wich you can use to check if a linux service is running. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. They are a web interface and command line tool set to work with Nagios config that have decent default templates and "example" files that you can leverage for common checks. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. Giving material.angular.io a refresh from Angular Blog Medium. There are no attachments for this article. Making statements based on opinion; back them up with references or personal experience. Note: A service must be defined in Nagios before you can submit passive check results for it! The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. All other servicemarks and trademarks are the property of their respective owner. . Nagios check_by_ssh returns status 3 even though running the command manually works? What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm.