A user nagios is created for both localhost and for any host. How to install and configure Nagios Core. 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. When Nagios checks the status of services, it will be able to detect when a service changes between OK, WARNING, UNKNOWN, and CRITICAL states and take appropriate action. Method 2. Yeah, it's totally brute-force, but
it works for me. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. . How Nagios process handles passive check results can be defined in the main Nagios configuration file. 2022 Company, Inc. All rights reserved. In the following example, we are checking whether the website certificate expires in the next 365 days. No paper. 1. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Host is just like a computer; it can be a physical device or virtual. The check_init_service plugin does not support checking multiple services. 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. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. define service{ Is it possible to check a web page through an authenticated proxy server? 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. These checks are scripts and progams which take input (for example, which host to check, tresholds), do a check and then return an exit code and some performance data. It is possible to configure Nagios so that it will receive status information sent over a command pipe. 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. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. 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. Can i specify what a valid response is, i.e. The external application writes the results of the check to the. Nagios check_dns / check_ip Example - Nagios Exchange The object file localhost.cfg allows for parameters to be passed to check_ssh. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Pass the specified string as User Agent in HTTP header. Add additional tags that should be sent in the HTTP header. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). On-demand service checks are also run in parallel if needed. Fortra's Intermapper vs Kaseya Traverse: which is better? 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 next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Also, depending on your configuration you should add this last file to the main file (/usr/local/nagios/etc/nagios.cfg): Check the configuration and, if no errors or warnings, reload the service: And now you have a new custom check on a host: Nagios has a huge library of plugins available at Nagios Exchange. 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. The following line is commented out to make MySQL listens on all interfaces. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. checkcommands.cfg in noc/nagios - scripts.mit.edu How to configure service templates - GroundWork Support It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Thanks for contributing an answer to Server Fault! thank you! Nagios Core is an Open Source system for monitoring hosts, networks and services. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. nagiosrpm. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that You can check whether a SSL certificate of the website expires within the next X number of days as shown below. More information on dependencies can be found here. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. Nagios configuration - How to configure Nagios - GeekPeek.Net Passive checks are also used when configuring distributed or redundant monitoring installations. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Nagios templates? How exactly do they work? : r/nagios - reddit First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). # These are some example service check commands. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. The processing of active and passive check results is essentially identical. It is called NSCA (Nagios Service Check Acceptor). Check whether Apache HTTP is running on a remote server using check_http. I've provided some comments here, but things may not be so # clear without further explanation. Thank you for any assistance you can provide. The provided scripts contain help on the syntax. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. How to use it? 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Another example is where an application already processes information such as network bandwidth utilization. Once the host and services are configured on Nagios, checks are used to see if the hosts and services are working as they are supposed to or not. Passive checks require all the logic related to what should be reported and when it should be checked to be put in an external application. 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). It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. 6 Nagios Command Line Options Explained with Examples - The Geek Stuff b-b.mit.edu In fact, we officially. VS Code extension | 35 comentarios en LinkedIn On-demand checks are performed as part of the predictive service dependency check logic. More information on the NSCA addon can be found here. Passive Checks Documentation NCPA - Nagios This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Previous parts of this book often mentioned Nagios performing checks on various software and machines. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. Latest Insight on DNS Monitoring Tool Market Outlook 2023 to 2030 With This yields less output to dig through. 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. 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. Linux Check Service - Nagios Exchange The performance of on-demand service checks can be significantly improved by implementing the use of cached checks, which allow Nagios to forgo executing a service check if it determines a relatively recent check result will do instead. Default is HTTP/1. Test Server 1: custom application (TCP Port. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Force a check and you will see exactly how the command is being run. How to monitor common services with Nagios - Xmodulo UNKNOWN 2013-04-25 18:11:24 0d 0h 55m 37s 4/4 RESPONSE: UNKNOWN ERROR: /usr/bin/nc does does not exist, i am really getting frustrate from this nagios error, nitin: you need to install the netcat package for your distribution which will provide /usr/bin/nc, I had been using this plugin for a while. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. # Plugin commands (service and host check commands) # Arguments are likely to change between different . Manula's Blog: Monitoring a HTTPS URL with Nagios However, two hours after the last passive or active check result was received, Nagios would perform an active check to keep the results up-to-date. Check WMI Plus includes a service module that can check if a service is running. Passive Checks and NSCA (Nagios Service Check Acceptor) can nagios adjust its check time based on the status info? 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. Minimum number of days a SSL certiface must be valid. 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). Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. 5 Nagios check_http Plugin Examples for HTTP / HTTPS It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. # SAMPLE HOST CHECK . Here is how it can be done. I am running into the same problem as David Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. I will use a simple example. Puppet nagios check disk example - United States Tutorials Step-by-step This is how your host definitions look currently . Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. If you want know more, just read and play with: I'm new to shell and would like to understand and adapt your script would you comment on why this particular adaptation wont work (results unknown - 0 regardless of input parameter sent by the user), countWarnings=$(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5), echo "example: plugin.sh minimal_counter_for_warning_alert counter_for_critical_alert", if (($warn<=$countWarnings ||$countWarnings==0)); then, echo "OK - $countWarnings services in Warning state", elif (($warn<$countWarnings && $countWarnings<=$crit)); then, echo "WARNING - $countWarnings services in Warning state", echo "CRITICAL - $countWarnings services in Warning state", [emailprotected]:/usr/local/nagios/libexec$ echo $(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5). Nagios can check whether the server is online by running ping on the IP/name of the server as well as it can be set up to provide warnings in case the round trip time (RTT) to the server increases. Check WMI Plus includes a service module that can check if a service is stopped. . A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). 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. . The following file can be modified to do the job. use generic-service ; Name of service template to use From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Nagios allows applications and event handlers to send out passive check results for host objects. Get your subscription here. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. To figure this out I set nagios into debug mode with the configuration like this. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. On a finishing note, Nagios can monitor many other sectors of a network. The script should then post results to the Nagios daemon. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. TRUST_EXIT_CODE=0 usage () { cat <<EOF Active checks are most common in the Nagios world. Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! Securely download your document with other editable templates, any time, with PDFfiller. All other servicemarks and trademarks are the property of their respective owner. 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. Nagios Core and Nagios XI has a features to monitoring website URL status. 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. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. In other cases, passive checks are the way to go. It is vital to make sure only legitimate networks have access to the database. Passive Checks with Nagios ADMIN Magazine 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Another difference is that active checks require much less effort to be set up when compared to passive checks. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. This will give an idea on whether the execution will be successful and what the output of the script will look like. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. The figure shown below shows a passive check . This can be done in addition to active checks, to identify critical problems earlier. The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). Default is 80, This will use HTTPS using default 443 port. In order to make Nagios treat passive host check results in the same way as active check results, we need to enable the following option: By default, Nagios treats host results from passive checks as hard results. 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! For Nagios, many, many Oracle plugins are available for checking database availability and performance. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. Hi, thanks for your comment. This can be done to gather all critical errors to a single, central place. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. After installing nagios and nagios-plugins-all (via yum), I've c. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. Agree For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file check_http: command not found. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. 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. The documentation uses the example of: for . This feature is only available to subscribers. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! It says Unknown option specified in config file , check_http -I 10.0.0.76 -p 8192 url=/MYServiceBus/ post= eregi=.Status_Code.0./Status_Code. 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. 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. What is check_http? How to tell which packages are held back due to phased updates. rev2023.3.3.43278. It only takes a minute to sign up. . 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. No software installation. Or you can create a custom variable to store the port number , with your example: 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. To allow it to grow bigger before rotating, add more zeroes, for example. A good example would be a server that is a part of an application, processing job queues using a database. How to Write a Custom Nagios Check Plugin, /usr/local/nagios/etc/objects/commands.cfg, /usr/local/nagios/etc/objects/localhost.cfg, /usr/lib/nagios/plugins/check_users -w 5 -c 10, /usr/local/nagios/etc/objects/nrpeclient.cfg, Generic installation on Debian-based Client, Set the NRPE Check on the Server Configuration Files, Develop Network Applications for ESP8266 using Mongoose in Linux, How to Setup IKEv2 IPSec VPN Using strongSwan and Let's Encrypt on Rocky Linux 9, ISPConfig Perfect Multiserver setup on Ubuntu 20.04 and Debian 10, Generating Web Site Statistics With AWStats & JAWStats On Debian Lenny, How to Install Jitsi Video Conference Platform on Debian 11, How to Install LAMP Server Stack on Ubuntu 22.04, How to use grep to search for strings in files on the Linux shell, You have Nagios installed and running (You can follow this. The service check runs in a child process that was fork()ed from the main Nagios daemon. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. For HTTPS running on a different port, do the following. Try to put full path in the command line. 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. Tanuj Bansal - Data Analyst - Kafka Service Owner and Cloudera For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. 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.
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