if one of my checked systems goes down, and therefore fails a PING check, I do NOT need to be notified that a file system is unavailable, or that SSH is down, too. You do this with nagios -v command as root: Ensure it returns 0 errors and 0 warnings and proceed to reload the service: After reloading the service, you will see the associated check in the localhost. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. you have the flexibility of sending the passive check to Nagios with a different hostname. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). Server Fault is a question and answer site for system and network administrators. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Submitting Passive Check Results From Remote Hosts. 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. This setting will expose MySQL to all available interfaces, including WAN. The default FQDN used for testing is www.google.com, but it can be changed as needed. This is a plugin for Nagios wich you can use to check if a linux service is running. How Nagios process handles passive check results can be defined in the main Nagios configuration file. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. Service - Started Check to see if a service is started. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Manual tuning is needed to tell MySQL to listen on other interfaces as well. For Nagios to perform active checks when there is no up-to-date result from passive checks, you need to set the check_freshness directive to 1 and set freshness_threshold to the time period after which a check should be performed. This article assumes you have a working knowledge of Nagios. Are there tables of wastage rates for different fruit and veg? debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. To learn more, see our tips on writing great answers. 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. http://www.waggy.at/nagios/capture_plugin.htm, Go to your plugin directory - in my example it is, Type you plugin name - in my example it is, now run the full command - (plugin name) -H (hostname) -p (port number), However in this example port number is optional, in your config file which is look something like below (myserver.cfg) and you want to run check_cpu from command line, to check instantly (without GUI green or red), Try this - (plugin full path) - H (servername) -c (checkname). 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. Nagios will be configured to monitor SMTP and mail queue of the server. Nagios also offers a way of combining the benefits of both active and passive checks. Services are those which are used by Nagios to check something about a host. 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. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. Last updated on September 22, 2020 by Sarmed Rahman. These types of checks are called Passive Checks. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Default is 10 seconds. I am running into the same problem as David JOB, Another difference is that active checks require much less effort to be set up when compared to passive checks. Force a check and you will see exactly how the command is being run. Start the Nagios again. How to use it? This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. Check whether a document is older than x seconds. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. Define the checks on /etc/nagios/nrpe_local.cfg. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. 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. Nagios provides a sample configuration file, that we will use. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: Default is HTTP/1. Detecting and dealing with state changes is what Nagios is all about. The external application writes the results of the check to the. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Giving material.angular.io a refresh from Angular Blog Medium. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. service_description check http://MYIP/test.php Architect and design WAP data flow using BigData Platform. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). See the HTML : 45 The results are passed to Nagios in the same way as they are passed for hosts. Nagios also offers another way to work with the statuses of hosts and services. Services that are checked can be in one of four different states: Service checks are performed by plugins, which can return a state of OK, WARNING, UNKNOWN, or CRITICAL. Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Some methods support checking multiple services at once. Now send a trap and see how the service appears as in Nagios XI. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. We can also do it at a contact level, by disabling notifications . Learn more. Up To: Contents In the first case, Nagios takes care of the scheduling, and the command only needs to perform the actual checks and mark the results as OK/WARNING/CRITICAL based on how a check command is configured. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Far better then Nagios documentation. Check whether Apache HTTP is running on a remote server using check_http. Does a summoned creature play immediately after being summoned by a ready action? 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. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. These are executed on regular intervals, as defined by check_interval and retry_interval. As mentioned earlier, server-2 has postfix mail server set up on it. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. The plugin returns a CRITICAL state if the service is not started. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. this is THE MOST comprehensive and straight forward turorial I've seen. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. It allows to configure alerts and has different states for them. NPCA includes a service module that can check if a service is stopped. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. 1. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. 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. This task is really easy as Nagios has a built-in command for this. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? More information on dependencies can be found here. I wrote a plugin in a bash script to check for current Warnings. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. We can also configure Nagios so that if no new information has been provided within a certain period of time, it will use active checks to get the current status of the host or service. This example is going to restart the crond service as it is unlikely to cause any issues. 13. 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. Furthermore , Nagios can also check whether TCP port 80 (web server) is reachable e.g., the server is online but Apache/IIS is not responding. Here is how it can be done. The figure shown below shows an active check . Nagios understands the following exit codes: In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. 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. 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. You might also want to give the 'capture' plugin a try. Also, MySQL would not let just any host to connect to it. Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. It has been designed to run . Thank you for any assistance you can provide. The module defines a "good" service as one that is running and a "bad" service is one that is not running, so you can define critical is when more than 0 "good" services exist. Active checks are initiated by Nagios process and then run on a regular scheduled basis. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. thanks! @sunardo I just ran into this exact same thing. The __HOST__ is a special service name, which represents the host check in Nagios. It can report each problem when accessing the database. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro.

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