nagios service check example nagios service check example

Even if its parent host is currently DOWN, the child host state is also stored as DOWN. After installing nagios and nagios-plugins-all (via yum), I've c. Some methods support checking multiple services at once. Force a check and you will see exactly how the command is being run. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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. The same queue that is used for storing results from active checks is also used to store the results from passive checks. It says Unknown option specified in config file , check_http -I 10.0.0.76 -p 8192 url=/MYServiceBus/ post= eregi=.Status_Code.0./Status_Code. Does a summoned creature play immediately after being summoned by a ready action? 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. sudo usermod -aG docker kifarunix. Passive checks are performed by external processes and the results are given back to Nagios for processing. Note: A service must be defined in Nagios before you can submit passive check results for it! Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. The following is a script that runs the dd system command (visit http://man.linuxquestions.org/index.php?query=dd) to read an entire block device. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. Remember that the $USER1$ variable, is a local Nagios variable set in the resource.cfg file, in my case pointing to /usr/local/nagios/libexec. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. 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). By default Nagios supports URL monitoring and there is an command check_http, however if you want to monitor URL like SSL certification you can also do by extending the command options. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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! Nagios server in this example is hosted on 192.168..150 and an example client is hosted on IP 192.168..200 Exit Codes To identify the status of a monitored service, Nagios runs a check plugin on it. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. This is a plugin for Nagios wich you can use to check if a linux service is running. No software installation. . Nagios can check whether the server is online by running ping on the IP/name of the server as well as it can be set up to provide warnings in case the round trip time (RTT) to the server increases. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. In many cases, the time taken is not enough, as some checks need to be performed over a longer period of time to have satisfactory results. Thanks for contributing an answer to Server Fault! The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Host is just like a computer; it can be a physical device or virtual. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. This example is going to restart the crond service as it is unlikely to cause any issues. 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. 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. This allows for seamless integration of status information from external applications with Nagios. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. Installing the Nagios Remote Plugin Executor In this lab, we will install the Nagios Remote Plugin Executor on the Nagios Core Host as well as any remote hosts on which we haven't already installed it. That is superb artile I was looking for! What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. If you want Nagios to treat all passive check results for hosts as if they were soft results, you need to enable the following option in the main Nagios configuration file: Passive service checks are very similar to passive host checks. The -S option is not working with 2.0 plugins. 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. . The plugin returns a CRITICAL state if the service is not started. Would you please be so kind as to help me? If you preorder a special airline meal (e.g. Hi, thanks for your comment. 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. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. Check WMI Plus includes a service module that can check if a service is running. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). The script should then post results to the Nagios daemon. Default is HTTP/1. Now let us add check_interval directive. Yeah, it's totally brute-force, but it works for me. Scheduled service checks are run in parallel. This user is then granted all permission to all databases and will be used for monitoring. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Add the command to the NRPE configuration file on the client (/etc/nagios/nrpe_local.cfg): Now we can access the server and test it like any standard plugin. One of the problems is that such checks can take only a couple of seconds to completea typical timeout for an active check to complete is 10 or 30 seconds. 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. Now that the syntax is available, TCP port 80 can be checked as follows. An external application checks the status on hosts/services and writes the result to External Command File. This is very important in situations where a host behind a router is reported to be down because the router is actually down. Fortra's Intermapper vs Kaseya Traverse: which is better? This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. For HTTPS running on a different port, do the following. On-demand service checks are also run in parallel if needed. The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). NSClient++ includes a service module that can check if a service is stopped. This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. Note: A host must be defined in Nagios before you can submit passive check results for it! Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. The performance of on-demand service checks can be significantly improved by implementing the use of cached checks, which allow Nagios to forgo executing a service check if it determines a relatively recent check result will do instead. Test Server 1: custom application (TCP Port. To learn more, see our tips on writing great answers. You never know how many (if any) traps or alerts you'll receive in a given time frame, so it's not feasible to just monitor their status every few minutes. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). The Nagios Service Check Acceptor (NSCA ) addon has historically been the addon of choice for Nagios administrators that need to establish data feeds or passive check transmission between Nagios installations. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. In the Select resource macro: section, select USER1. 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). Nagios understands the following exit codes: To use a custom script as a plugin to run remotely through NRPE, you should first write the script on the server, for instance in /usr/local/scripts/check_root_home_du.sh: The previous script is a very simple example, checking the disk usage of the directory /root and setting a threshold for considering it OK, Warning or Critical. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Hi, this is a fantastic article, i managed to learn how to make plugins myself. Service status codes are the same as those for active checks0 for OK, 1 for WARNING, 2 for CRITICAL, and 3 for an UNKNOWN state. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. The output indicates that it expires in 300 days. On-demand as needed for predictive service dependency checks. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory.