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. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. }. This means that if Nagios receives a result indicating that a host is DOWN, it assumes that all child hosts are in an UNREACHABLE state. There are several different use cases covered in this KB article: The sections below provide examples of how to perform these checks using different methods. 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. This command accepts the host name, status code, and the textual output from a check. There are also different types of checks including external applications or devices that want to report information directly to Nagios. 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. The following directive allows it: Setting up hosts or services for passive checking requires an object to be defined and set up so as not to perform active checks. Default is 80, This will use HTTPS using default 443 port. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. Now that the syntax is available, TCP port 80 can be checked as follows. But if the monitoring application is not running or some other issue prevents it from reporting, Nagios can use active checks to keep the service status upto-date. In the following example, we are checking whether the website certificate expires in the next 365 days. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. 2022 Company, Inc. All rights reserved. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. I will leave this script with all the other Nagios plugins inside /usr/local/nagios/libexec/ (This directory may be different depending on your confiugration). Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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. NPCA includes a service module that can check if a service is running. 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. Hosts and service configurations are the building blocks of Nagios Core. The default FQDN used for testing is www.google.com, but it can be changed as needed. Securely download your document with other editable templates, any time, with PDFfiller. 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. Affordable solution to train a team and make them project ready. As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. When Nagios needs to run a scheduled service check, it will initiate the service check and then return to doing other work (running host checks, etc). rev2023.3.3.43278. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. # These are some example service check commands. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Are there tables of wastage rates for different fruit and veg? Nagios also offers a tool for sending passive check results for hosts and services over a network. NSClient++ includes a service module that can check if a service is running. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. Far better then Nagios documentation. What is check_http? In case you don't have the plugin in the Nagios server, you can install it with: So, summarizing, the NRPE will run a script in a remote host, and return the exit code to the Nagios server. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. Also, MySQL would not let just any host to connect to it. These types of checks are called Passive Checks. 5 check_http Command Examples 1. Hi, this is a fantastic article, i managed to learn how to make plugins myself. When services change state too frequently they are considered to be "flapping". So I decided to use the second method. you have the flexibility of sending the passive check to Nagios with a different hostname. Now let us add check_interval directive. The external application writes the results of the check to the. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. This is the main configuration file of Nagios core. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. 28. 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. 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 . 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. No paper. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Stop once the headers are downloaded. The results are passed to Nagios in the same way as they are passed for hosts. Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. Complete a blank sample electronically to Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. Services are those which are used by Nagios to check something about a host. For example . 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. I am gettinr this error in nagios3. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. For HTTPS running on a different port, do the following. We can also do it at a contact level, by disabling notifications . I wrote a plugin in a bash script to check for current Warnings. You have entered an incorrect email address! It will give you all the available options: When everything goes smoothly, we should be able to see our new Nagios client on the Nagios website with its new service OS: unread mail for root, as well as the status green OK. Note that there are possible security implications of this change, so it's worth mentioning a few words: The following tuning should do the trick. Detecting and dealing with state changes is what Nagios is all about. On-demand service checks are also run in parallel if needed. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. In general, if a check can be done quickly and does not require long running processes, it should definitely be done as an active service. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. 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. It has been designed to run . 1. How can I make Status Information for Nagios services easier to read? These checks help ensure that the dependency logic is as accurate as possible. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Check WMI Plus includes a service module that can check if a service is running. Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again. Nagios Core is an Open Source system for monitoring hosts, networks and services. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. The plugin 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 "stopped" have an OK state). In this tutorial, the following three servers are being used. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: 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. How Nagios process handles passive check results can be defined in the main Nagios configuration file. If I used the first method, I have to keep separate site.pp for each environment. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. So the Nagios Core version is 3.5.1. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. The following figure shows soft states and hard states. First, the servers are defined in Nagios. this is THE MOST comprehensive and straight forward turorial I've seen. The plugin returns a CRITICAL state if the service is not started. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. For example, to set up a very similar service, all we need to do is to use the same parameters as those for the hosts: In this case, Nagios will never perform any active checks on its own and will only rely on the results that are passed to it. The following settings are done for all MySQL servers. 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. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. 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). NPCA includes a service module that can check if a service is stopped. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. Check whether a document is older than x seconds. 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. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. # Defaults to 0, put to 1 for systemd. On a finishing note, Nagios can monitor many other sectors of a network. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. It allows to configure alerts and has different states for them. 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. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. 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. 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. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? First, install the Nagios Core server. I just used that simple script as an example, any language can be used to write your own custom plugin. On-demand checks are performed as part of the predictive service dependency check logic. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. In such a case, checks are done by other programs, and their results are sent to Nagios. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Scheduled service checks are run in parallel. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. . If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. The following screenshot shows a complete overview of all the service checks that have been configured so far. thanks! It can be used to send results from one Nagios instance to another. Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. The script should then post results to the Nagios daemon. 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. Or you can create a custom variable to store the port number , with your example: 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 next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. 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. Using the definition below, checks on the host will be performed after every 3 minutes. How can we prove that the supernatural or paranormal doesn't exist? 03-16-2010, 10:31 AM . I test the command from command line successfull, but when I insert in configuration file (cfg) it gives Error: Service check command check_http -H MYIP -u http://MYIP/test.php specified in service HTTP for host Server01 not defined anywhere! On the next screen: Enter a unique name in the Command Name field (suggest one is check_host_cluster and the other check_service_cluster) Append --host to the Command Line section for host . See the HTML : 45 Save my name, email, and website in this browser for the next time I comment. Pass the specified string as User Agent in HTTP header. Establish a terminal session to your Nagios XI server and execute the following command: How to Install Nagios? But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. In order to be able to submit passive check results, we need to configure Nagios to allow the sending of passive check results, and set the host objects to accept them.