Giving material.angular.io a refresh from Angular Blog Medium. 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). An external application checks the status of a host or service. Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). # SAMPLE HOST CHECK . Nagios's primary mode of "service checking" is called an active check. In order to enable passive checks in Nagios, you'll need to do the following: If you want to disable processing of passive checks on a global basis, set the accept_passive_service_checks directive to 0. 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. 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 above definitions add a host called ubuntu_host and defines the services which will run on this host. By default, Nagios handles results from active and passive checks differently. How to install and configure Nagios Core. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. In the following example, we are checking whether the website certificate expires in the next 365 days. In other cases, passive checks are the way to go. 5 check_http Command Examples 1. To learn more, see our tips on writing great answers. 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. This task is really easy as Nagios has a built-in command for this. 2. Follow these steps to install the plugin: Download the plugin. 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. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. 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! First, the servers are defined in Nagios. Even the location of the plugins directory is in there. Each server runs one or more common services. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. I'd like to use the command line to run that particular check and get the output. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. Related Commands. 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. Check whether Apache HTTP is running on a remote server using check_http. hello.. 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}. Use Puppet 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. 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. If you would like to use the whole or any part of this article, you need to cite this web page at Xmodulo.com as the original source. 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. On-demand service checks are also run in parallel if needed. 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. In fact, we officially. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. can nagios adjust its check time based on the status info? Complete a blank sample electronically to It allows to configure alerts and has different states for them. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. In the Select resource macro: section, select USER1. - specific URL support - ssl option - alternative port - fake user agent - proxy as parameter - proxy from environment variable Usage: check_website [OPTIONS] {HOSTNAME} {HOSTNAME} host to check (dns/ip) [OPTIONS]: Test Server 1: custom application (TCP Port. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. This example is going to restart the crond service as it is unlikely to cause any issues. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. 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. sudo usermod -aG docker kifarunix. In this way, NSCA communication sent over the Internet is more secure. The default FQDN used for testing is www.google.com, but it can be changed as needed. On any device & OS. 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). 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. As an example of the use of this script, the command that is sent to Nagios for host01, service PING, status code 0 (OK) and output RTT=57 ms is as follows: A very common scenario for using passive checks is a check that takes a very long time to complete. 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. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Nagios can tell what the status of the service is by reading the exit code of the check. Another example is where an application already processes information such as network bandwidth utilization. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. For Nagios, many, many Oracle plugins are available for checking database availability and performance. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. Select check_cluster from the plugin pop-up menu. 13. check_command check_http -H MYIP -u http://MYIP/test.php In order to use them, the host needs to be configured to accept passive checks results. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. First, install the Nagios Core server. Is there a proper earth ground point in this switch box? Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Using the definition below, checks on the host will be performed after every 3 minutes. However, if there are no jobs to process and the application is not using it, Nagios will not have up-to-date information about the database. The files and information on this site are the property of their respective owner(s). debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Affordable solution to train a team and make them project ready. How Nagios process handles passive check results can be defined in the main Nagios configuration file. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. 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. You can check tomcat server, or apache server, or glassfish, or any server that is running on a different port by speficying the port number as shown below. As mentioned earlier, server-2 has postfix mail server set up on it. 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. A user nagios is created for both localhost and for any host.
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