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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. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Nagios: Simple Oracle Check. The object file localhost.cfg allows for parameters to be passed to check_ssh. Establish a terminal session to your Nagios XI server and execute the following command: The best answers are voted up and rise to the top, Not the answer you're looking for? This task is really easy as Nagios has a built-in command for this. To learn more, see our tips on writing great answers. 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. In an earlier post, I showed how to . In such cases, only reports regarding hard state changes are propagated across Nagios servers. 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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. @sunardo I just ran into this exact same thing. Services are those which are used by Nagios to check something about a host. That is superb artile I was looking for! The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. 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. A sample definition for a host that runs an active check if there has been no result provided within the last two hours: The following is an illustration showing when Nagios would invoke active checks: Each time there is at least one passive check result that is still valid (i.e., was received within the past two hours), Nagios will not perform any active checks. However, applications on remote hosts can't do this so easily. Hosts and service configurations are the building blocks of Nagios Core. I Have problem with the check_http when I try ur command test , I have the next message : Rather, Nagios takes the passive check result to be the actual state the host is in and doesn't try to determine the host's actual state using the reachability logic. The line should look like: Define the standard checks that you will perform on every client with NRPE. A good example of such a test is checking whether there are bad blocks on a disk. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. In such a case, checks are done by other programs, and their results are sent to Nagios. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. If you preorder a special airline meal (e.g. Is there a proper earth ground point in this switch box? 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. This is the main configuration file of Nagios core. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. This is a plugin for Nagios wich you can use to check if a linux service is running. To figure this out I set nagios into debug mode with the configuration like this. As this tutorial is based on Debian 9, I will show as an example how to install it, but you can find instructions for any distribution. A user nagios is created for both localhost and for any host. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. Nagios dependencies.cfg example file. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. Filters such as firewall and TCP wrappers should be used. 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. Start the Nagios again. 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. This setting is done on all MySQL servers. 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. By using this website, you agree with our Cookies Policy. Check whether Apache HTTPS is running on a remote server using check_http. You have entered an incorrect email address! Up To: Contents Nagios comes with a wide range of built-in scripts for monitoring services. >Mainly Focus on Kafka and Cloudera services, Cluster . In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. Default is 80, This will use HTTPS using default 443 port. This is how your host definitions look currently . The following file can be modified to do the job. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. For example . How can we prove that the supernatural or paranormal doesn't exist? I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. The check logic inside Nagios process starts the Active check. 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. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. As mentioned earlier, server-2 has postfix mail server set up on it. 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 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{ The plugin returns a CRITICAL state if the service is not started. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . When a URL is redirected, use this to either follow the URL, or send ok, warning, or critical notification, Specify the minimum and maximum page size expected in bytes. I take a slightly more brute-force direction than @Zoredache, I login to the nagios server and do "while true; do ps awwlx | grep NAGIOS_CHECK_NAME; done", while I force a re-check of the service, where NAGIOS_CHECK_NAME is either part of the check name or the IP of the server I am looking for. This plugin uses systemctl is-active command, please check you have systemd. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. 2. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. 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. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: define host { use generic-host host_name linuxbox01 address 10.0.2.1 command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. I wrote a plugin in a bash script to check for current Warnings. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE.