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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. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . 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. I've: 5 # provided some comments here, but things may not be so clear without further . Cached checks will only provide a performance increase if you are making use of service dependencies. For example: Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Using the definition below, checks on the host will be performed after every 3 minutes. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. 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). It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. 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. 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. Service Checks - Nagios /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: Check WMI Plus includes a service module that can check if a service is running. Save my name, email, and website in this browser for the next time I comment. 13. System Monitoring Via Nagios and SNMP< SNMP snmp is an internet protocol that allows you to retrieve management information from a remote device or to set configuration settings on a remote device. It shows what is performed by Nagios in both cases and what needs to be done by the check command or an external application for passive checks. I Have problem with the check_http when I try ur command test , I have the next message : First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). 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. When Nagios plans and receives results from active checks, it takes the actual network topology into consideration and performs a translation of the states based on this. Now that the syntax is available, TCP port 80 can be checked as follows. The first thing that needs to be done in order to use passive checks for your Nagios setup is to make sure that you have the following options in your main Nagios configuration file: It would also be good to enable the logging of incoming passive checksthis makes determining the problem of not processing a passive check much easier. Nagios.cfg is the main configuration file for your Nagios Core. You have entered an incorrect email address! When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. 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. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Nagios will ignore all check results for services that had not been configured before it was last (re)started. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. This can be done to gather all critical errors to a single, central place. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! 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. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. The following file can be modified to do the job. The output indicates that it expires in 300 days. 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. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. It is vital to make sure only legitimate networks have access to the database. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. But today when I am trying to post an XML message to the server, from console it works well but does not work with nrpe. Or you can create a custom variable to store the port number , with your example: As a Cloudera Administrator and Kafka service owner, leading Kafka/flume/ZK services in WAP (Multi DC Environment), Leading TICK Stack (Influxdb) and Grafana along with Administration of ELK Stack (Elasticsearch, Logstash) and Cloudera Clusters with CI/CD approach, Automation. 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. By using this website, you agree with our Cookies Policy. Passive checks are useful for monitoring services that are: Examples of asynchronous services that lend themselves to being monitored passively include SNMP traps and security alerts. Nagios vs Zabbix - What's the Difference ? (Pros and Cons) sudo usermod -aG docker kifarunix. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. The __HOST__ is a special service name, which represents the host check in Nagios. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Nagios's primary mode of "service checking" is called an active check. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, Service state changes can also trigger on-demand host checks. The default FQDN used for testing is www.google.com, but it can be changed as needed. More information on how this works can be found here. /usr/nagios/libexec/check_http .. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. The application can also periodically let Nagios know if it succeeded in using the database without problems. The check logic inside Nagios process starts the Active check. Pass the specified string as User Agent in HTTP header. When a host or service is down for a very short duration of time and its status is not known or different from previous one, then soft states are used. There are no attachments for this article. Yeah, it's totally brute-force, but it works for me. Giving material.angular.io a refresh from Angular Blog Medium. Detecting and dealing with state changes is what Nagios is all about. We want Nagios to monitor this database, and as the application is already using it, we can add a module that reports this to Nagios. The -S option is not working with 2.0 plugins. Thanks for contributing an answer to Server Fault! Active checks can be used to "poll" a device or service for status information every so often. 28. Apply these agent configurations After the NRDP installation, install the NCPA. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. Expected response string. How to configure service templates - GroundWork Support Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. 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. 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. 6 Nagios Command Line Options Explained with Examples - The Geek Stuff Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Fortra's Intermapper vs Kaseya Traverse vs Nagios XI comparison ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. With a little tweaking, Nagios can help monitor this application port as well. . Get your subscription here. mark separates the command from the arguments in the check_command entry. See Also: Active Checks, Service Checks, Host Checks. nagios-plugins/check_service.sh at master - GitHub Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. notifications_enabled 0 Start the Nagios again. awesome. Fortra's Intermapper vs Kaseya Traverse: which is better? Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat 2022 Company, Inc. All rights reserved. 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