nagios service check example

When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. Restarting Linux Services with NRPE - force.com Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. . The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. The application can also periodically let Nagios know if it succeeded in using the database without problems. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. To figure this out I set nagios into debug mode with the configuration like this. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Nagios dependencies.cfg example file. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. i'm very new on that kind of progamming what does this line ", " means i really want to lear some but i need help please helpme. In an earlier post, I showed how to . Yeah, it's totally brute-force, but it works for me. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? . The provided scripts contain help on the syntax. Submitting Passive Check Results From Remote Hosts. First you should define a command in the commands.cfg file. This yields less output to dig through. just because i had already looked in the commands.cfg file to figure out which commands were running, but i wanted to know what flags were being set. Does a summoned creature play immediately after being summoned by a ready action? In the following example, we are checking whether the website certificate expires in the next 365 days. The figure shown below shows an active check . Do not wait for whole document body to download. But if the monitoring application is not running or some other issue prevents it from reporting, Nagios can use active checks to keep the service status upto-date. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. If I used the first method, I have to keep separate site.pp for each environment. NRDP Overview - force.com To learn more, see our tips on writing great answers. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. Set enable_notifications=0 in nagios.cfg. Nagios provides a sample configuration file, that we will use. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. 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. The following is a sample script that will accept the host name, status code, and output from a check and will submit these to Nagios: As an example of the use of this script, the command that is sent to Nagios for host01, status code 2 (UNREACHABLE) and output router 192.168.1.2 down would be as follows: When submitting results, it is worth noting that Nagios might take some time to process them, depending on the intervals between Nagios checks of the external command pipe. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. It says -S is for version. There are several different use cases covered in this KB article: The sections below provide examples of how to perform these checks using different methods. A good example of such a test is checking whether there are bad blocks on a disk. Establish a terminal session to your Nagios XI server and execute the following command: This is the main configuration file of Nagios core. Force a check and you will see exactly how the command is being run. Just cd (or not) into the plugins directory (this directory location varies, depending on how you've installed it, but check /usr/local/nagios, or /usr/lib/nagios). It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Default is HTTP/1. I've provided some comments here, but things may not be so # clear without further explanation. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. NSClient++ includes a service module that can check if a service is stopped. Nagios configuration - How to configure Nagios - GeekPeek.Net 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. Linux Check Service - Nagios Exchange For example, to set up a very similar service, all we need to do is to use the same parameters as those for the hosts: In this case, Nagios will never perform any active checks on its own and will only rely on the results that are passed to it. Passive checks are useful for monitoring services that are: Examples of asynchronous services that lend themselves to being monitored passively include SNMP traps and security alerts. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Use this Nagios monitoring tutorial for proactive IT monitoring In other cases, passive checks are the way to go. i.e: Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. It allows to configure alerts and has different states for them. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 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. 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}. awesome. There would be many cases when the failures will happen randomly and they are temporary; hence Nagios uses states to check the current status of a host or service. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! The flexibility provided by Nagios is perfect for these case scenarios. Nagios executes event handlers to handle hard states. Let's consider I have the Nagios server configured to alert only on critical status, so I want an alert if I have too many services on a Warning status. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Go to the /usr/local/nagios/libexec dir (assuming you have installed nagios from source, if you have used a package from your distribution, check the docs of your package): $ cd /usr/local/nagios/libexec execute the check_dns plugin with the --help switch. can anyone help me out for this problem:-, Check-Website-Response +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. As mentioned earlier, server-2 has postfix mail server set up on it. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. How to configure service templates - GroundWork Support I'd like to use the command line to run that particular check and get the output. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. So I decided to use the second method. Is there a more efficient way to do this? Monitor whether the apache server is available. How to Monitor PostgreSQL using Nagios | Severalnines check_command check_http -H MYIP -u http://MYIP/test.php (In this example, the script will print All ok and it will exit with 0, the OK . checkcommands.cfg in branches/locker-dev/noc/nagios - scripts.mit.edu The default FQDN used for testing is www.google.com, but it can be changed as needed. Or you can create a custom variable to store the port number , with your example: How to tell which packages are held back due to phased updates. nagiosrpm. use generic-service ; Name of service template to use Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. 28. Asking for help, clarification, or responding to other answers. The following diagram shows how both active and passive checks are performed by Nagios. An external application checks the status on hosts/services and writes the result to External Command File. Remotely monitor servers with the Nagios check_by_ssh plugin This can be done to gather all critical errors to a single, central place. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. If an application that resides on the same host as Nagios is sending passive host or service check results, it can simply write the results directly to the external command file as outlined above. 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 . >Mainly Focus on Kafka and Cloudera services, Cluster . For example, you can use the 'check_http' plugin to verify that a web server is running, is returning the right text, or has an up-to-date SSL certificate. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. The documentation uses the example of: for . The plugin returns a CRITICAL state if the service is not started. This article assumes you have a working knowledge of Nagios. How to use Nagios to monitor your server and services This can cause problems if you are submitting passive checks from a remote host or you have a distributed monitoring setup where the parent/child host relationships are different. The same queue that is used for storing results from active checks is also used to store the results from passive checks. this is THE MOST comprehensive and straight forward turorial I've seen. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. 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. The following line is commented out to make MySQL listens on all interfaces. The plugins can be in any language, Nagios only cares They can be the following: 0: OK This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. For instance, a model for the file could be: The idea of having that generic file is so that you can check the same on every client. Here is my configuration : The files and information on this site are the property of their respective owner(s). The best answers are voted up and rise to the top, Not the answer you're looking for? You do this with nagios -v command as root: Ensure it returns 0 errors and 0 warnings and proceed to reload the service: After reloading the service, you will see the associated check in the localhost. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. Manula's Blog: Monitoring a HTTPS URL with Nagios Start the Nagios again. How Nagios process handles passive check results can be defined in the main Nagios configuration file. You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. I am gettinr this error in nagios3. 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. Depending on the status received on hosts and services, appropriate action is taken. Monitor DNS server with Nagios 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. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. Far better then Nagios documentation. $ check_http -H 192.168.1.50 HTTP OK HTTP/1.1 200 OK - 332 bytes in 0.004 seconds |time=0.004144s;;;0.000000 size=332B;;;0 2. How to use it? 2. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). 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. However, in a big environment it is very likely to need some custom checks for specific uses, for instance: Checking on a certain task result, monitoring an in-house developed application, among others. Service Checks - Nagios NSClient++ includes a service module that can check if a service is running. It's pretty simple. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. This can be done in addition to active checks, to identify critical problems earlier. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. When a host or service is down for a very short duration of time and its status is not known or different from previous one, then soft states are used. [SOLVED] Nagios dependencies.cfg example file Another example is where an application already processes information such as network bandwidth utilization. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . Cached checks will only provide a performance increase if you are making use of service dependencies. Copy the configuration file to the Apache directory: /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.conf Install the Nagios Plugins to have a set of tools to monitor your different services: apt install build-essential libssl-dev gcc 5 check_http examples With a little tweaking, Nagios can help monitor this application port as well. Minimum number of days a SSL certiface must be valid. Check whether a document is older than x seconds. The object file localhost.cfg allows for parameters to be passed to check_ssh. Nagios Core and Nagios XI has a features to monitoring website URL status. These checks are useful when you cannot monitor hosts/services on a regular basis. Nagios also offers another way to work with the statuses of hosts and services. For this reason, the only way to perform such a check is to schedule them from the systemfor example, using the cron daemon (visit http://man.linuxquestions.org/index.php?query=cron). Hi, this is a fantastic article, i managed to learn how to make plugins myself. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Monitoring Website URL Status Using Nagios check_http - ARKIT This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. I test the command from command line successfull, but when I insert in configuration file (cfg) it gives Error: Service check command check_http -H MYIP -u http://MYIP/test.php specified in service HTTP for host Server01 not defined anywhere!