nagios service check example nagios service check example

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. To figure this out I set nagios into debug mode with the configuration like this. When services change state too frequently they are considered to be "flapping". These plugin states directly translate to service states. This is how your host definitions look currently . The following diagram shows how both active and passive checks are performed by Nagios. More information on dependencies can be found here. Manual tuning is needed to tell MySQL to listen on other interfaces as well. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. You can create a host file inside the server directory of Nagios and mention the host and service definitions. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Up To: Contents Related Commands. Select check_cluster from the plugin pop-up menu. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. $ 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. The following line is commented out to make MySQL listens on all interfaces. For example, if you are bringing down your HTTP server everyday sometime between midnight and 1:59 a.m, you can specify the above "247-except-night-12-2" timeperiod in your service definition for the check_period and notification_period as shown below for your particular service definition. thank you! A user [emailprotected] is created in MySQL server. will hold the return value of commands between $( ). Passive checks are initiated and performed by external applications/processes, Passive check results are submitted to Nagios for processing, Asynchronous in nature and cannot be monitored effectively by polling their status on a regularly scheduled basis, Located behind a firewall and cannot be checked actively from the monitoring host. Nagios comes with a wide range of built-in scripts for monitoring services. . Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. The object file localhost.cfg allows for parameters to be passed to check_ssh. But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. The method for using any of these "plugins" from the command line is the same as any other Linux script: Just run "./plugin-name" with the appropriate flags you want to check, and voila! Let us see an example to perform checks on host . For example . Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. 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. define service{ On the next screen: Enter a unique name in the Command Name field (suggest one is check_host_cluster and the other check_service_cluster) Append --host to the Command Line section for host . The check_init_service plugin does not support checking multiple 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). 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. This yields less output to dig through. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). If you would like to disable passive checks for just a few hosts or services, use the passive_checks_enabled directive in the host and/or service definitions to do so. Giving material.angular.io a refresh from Angular Blog Medium. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. Is there a proper earth ground point in this switch box? How can I make Status Information for Nagios services easier to read? How to Install Nagios? The application can also periodically let Nagios know if it succeeded in using the database without problems. I've: 5 # provided some comments here, but things may not be so clear without further . Check whether a document is older than x seconds. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. 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 files and information on this site are the property of their respective owner(s). Far better then Nagios documentation. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. The above definitions add a host called ubuntu_host and defines the services which will run on this host. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 1 check_http -p 8083 - user4556274 Jul 29, 2016 at 12:49 Add a comment 3 Answers Sorted by: 3 You can specify the port number directly in the command but you will must create one command per tested port. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. 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. NPCA includes a service module that can check if a service is running. Agree The line should look like: Define the standard checks that you will perform on every client with NRPE. In this way, NSCA communication sent over the Internet is more secure. 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. Indicate content type in header for POST request, Regular expression can span to new line (Use this with -r or -R option), Use this regular expression to search for string in the HTTP page, If the site user basic authentication send uid, pwd in the format uid:pwd. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Follow these steps to install the plugin: Download the plugin. In such a case, checks are done by other programs, and their results are sent to Nagios. Passive checks are also used when configuring distributed or redundant monitoring installations. Server Fault is a question and answer site for system and network administrators. 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. We can also do it at a contact level, by disabling notifications . Passive service checks are often used to report the results of long lasting tests asynchronously. 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. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. To figure this out I set nagios into debug mode with the configuration like this. A good example would be a server that is a part of an application, processing job queues using a database. Nagios's primary mode of "service checking" is called an active check. Submitting Passive Host Check Results External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. Architect and design WAP data flow using BigData Platform. 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. Define the checks on /etc/nagios/nrpe_local.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. 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. 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. Nagios Core is an Open Source system for monitoring hosts, networks and services. So the Nagios Core version is 3.5.1. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. In fact, we officially. To do this: Navigate to Configuration > Command > New. Force a check and you will see exactly how the command is being run. Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. check_command check_http -H MYIP -u http://MYIP/test.php 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). By default you do not need to change any of the lines in this file and . Note: A service must be defined in Nagios before you can submit passive check results for it! Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. Now send a trap and see how the service appears as in Nagios XI. The plugins can be in any language, Nagios only cares They can be the following: 0: OK you have the flexibility of sending the passive check to Nagios with a different hostname. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Let us assume that the following custom application is also running in the network, listening on a particular port. NSClient++ includes a service module that can check if a service is stopped. The best answers are voted up and rise to the top, Not the answer you're looking for? >Mainly Focus on Kafka and Cloudera services, Cluster . Add additional tags that should be sent in the HTTP header. On any device & OS.