First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). 5 check_http examples Affordable solution to train a team and make them project ready. It is vital to make sure only legitimate networks have access to the database. 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. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. The figure shown below shows an active check . This cant be done as an active check as reading the device takes a lot of time to completelarger disks might require several hours to complete. Service - Started Check to see if a service is started. 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. Default is HTTP/1. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. To do this: Navigate to Configuration > Command > New. Manual tuning is needed to tell MySQL to listen on other interfaces as well. As mentioned earlier, Nagios can forgo the actual execution of an on-demand service check if it can use the cached results from a relatively recent service check. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. Method 3. Host is just like a computer; it can be a physical device or virtual. In an earlier post, I showed how to . My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? These checks can provide useful insight on what is going on within the Nagios server. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. 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. All other servicemarks and trademarks are the property of their respective owner. # Plugin commands (service and host check commands) # Arguments are likely to change between different . If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. 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. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. To learn more, see our tips on writing great answers. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Filters such as firewall and TCP wrappers should be used. You know the basics on Nagios administration. Nagioshttpdgccgd. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. This is a plugin for Nagios wich you can use to check if a linux service is running. November 2012, by Simon Krenger. NSCA stands for Nagios Service Check Acceptor. Otherwise we must rely on parsing the # output from the service management tool. Viewed 12725 times since Tue, Nov 14, 2017, Viewed 18667 times since Tue, Nov 28, 2017, Viewed 70502 times since Thu, Nov 9, 2017, Viewed 9709 times since Tue, Nov 14, 2017, Viewed 12197 times since Wed, Nov 29, 2017, Viewed 47389 times since Thu, Nov 9, 2017, Viewed 14647 times since Sun, Nov 26, 2017, Viewed 42173 times since Mon, Nov 13, 2017, Viewed 18034 times since Wed, Nov 15, 2017, Viewed 22586 times since Sun, Nov 26, 2017. As the Nagios toolsets, including NSCA (Nagios Service Check Acceptor for submitting passive check results to the Nagios core server) and NRPE (Nagios Remote Plugin Executor for accepting active check requests from the Nagios core server and send back the results), were initially only developed for Unix-based and Linux Operating Systems, Services are those which are used by Nagios to check something about a host. This plugin uses systemctl is-active command, please check you have systemd. Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. Fortra's Intermapper vs Kaseya Traverse: which is better? This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. A user nagios is created for both localhost and for any host. 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. Submitting Passive Check Results From Remote Hosts. 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. check_command check_http -H MYIP -u http://MYIP/test.php To allow it to grow bigger before rotating, add more zeroes, for example. We can also do it at a contact level, by disabling notifications . Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. (If I were running df -h on the linux CLI, I'm using the "h" flag - in the case of the df command, the h stands for "human readable".) I wrote a plugin in a bash script to check for current Warnings. A good example might be running a check that takes several hours to completein this case, it does not make sense to raise the global service_check_timeout option, but rather to schedule these checks outside of Nagios and only report the results back to it. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Monitor whether the apache server is available. 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. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. thanks! Learn more. 2022 Company, Inc. All rights reserved. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Also, MySQL would not let just any host to connect to it. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. So if you wanted to run the check_http check from the CLI, you would run ./check_http -I, where the I flag stands for the IP Address (, I struggled to get this to work, not sure what i was doing wrong (noob) but the debug_level trick worked for me :). How can I manually run a nagios check from the command line? Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. This is how your host definitions look currently . Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. 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. Previous parts of this book often mentioned Nagios performing checks on various software and machines. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. 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! Service state changes can also trigger on-demand host checks. If I used the first method, I have to keep separate site.pp for each environment. 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 nagios.cfg. 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). Let us see an example to perform checks on host . mark separates the command from the arguments in the check_command entry. 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 . This user is then granted all permission to all databases and will be used for monitoring. Services are those which are used by Nagios to check something about a host. These types of checks are called Passive Checks. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. To turn on everything you want to set debug_level=4095. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. So I will add at the end of the file the following block:Advertisement.banner-1{text-align:center;padding-top:20px!important;padding-bottom:20px!important;padding-left:0!important;padding-right:0!important;background-color:#eee!important;outline:1px solid #dfdfdf;min-height:335px!important}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-banner-1','ezslot_4',111,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-banner-1-0');.banner-1{text-align:center;padding-top:20px!important;padding-bottom:20px!important;padding-left:0!important;padding-right:0!important;background-color:#eee!important;outline:1px solid #dfdfdf;min-height:335px!important}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-banner-1','ezslot_5',111,'0','1'])};__ez_fad_position('div-gpt-ad-howtoforge_com-banner-1-0_1');.banner-1-multi-111{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}. this is THE MOST comprehensive and straight forward turorial I've seen. Nagios also offers a way of combining the benefits of both active and passive checks. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. 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. Now let us add check_interval directive. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. @sunardo I just ran into this exact same thing. Now that the syntax is available, TCP port 80 can be checked as follows. First you should define a command in the commands.cfg file. Format is minimum:maximum, Response time in seconds for warning state, Response time in seconds for critical state, Number of seconds to wait before connection times out. This is a plugin for Nagios wich you can use to check if a linux service is running. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. Nagios check_by_ssh returns status 3 even though running the command manually works? It is called NSCA (Nagios Service Check Acceptor).