How to use it? Now that the syntax is available, TCP port 80 can be checked as follows. . The following is a script that runs the dd system command (visit http://man.linuxquestions.org/index.php?query=dd) to read an entire block device. Nagios Core is an Open Source system for monitoring hosts, networks and services. 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. This command accepts the host name, status code, and the textual output from a check. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. 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. The plugin returns a CRITICAL state if the service is not started. There are no attachments for this article. After defining the command you can associate that command to a service, and then to a host. For example . Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. The __HOST__ is a special service name, which represents the host check in Nagios. Related Commands. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. 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. The script should then post results to the Nagios daemon. Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. On any device & OS. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. To figure this out I set nagios into debug mode with the configuration like this. The object file localhost.cfg allows for parameters to be passed to check_ssh. It also defines Nagios user and group under which Nagios instance is running. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . You have entered an incorrect email address! Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. These plugin states directly translate to service states. Nagios also offers another way to work with the statuses of hosts and services. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation Affordable solution to train a team and make them project ready. I Have problem with the check_http when I try ur command test , I have the next message : check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. The plugin returns a CRITICAL state if the service is not started. 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. TRUST_EXIT_CODE=0 usage () { cat <<EOF It allows to configure alerts and has different states for them. 03-16-2010, 10:31 AM . The sections below provide examples of how to perform these checks using different methods. The documentation uses the example of: for . These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. It's pretty simple. 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. sudo usermod -aG docker kifarunix. There are also different types of checks including external applications or devices that want to report information directly to Nagios. By default you do not need to change any of the lines in this file and . I'd like to use the command line to run that particular check and get the output. The following file can be modified to do the job. Default is HTTP/1. 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. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. 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. 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. To learn more, see our tips on writing great answers. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Kaydolmak ve ilere teklif vermek cretsizdir. 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. So if you wanted to run the check_http check from the CLI, you would run ./check_http -I, where the I flag stands for the IP Address (, I struggled to get this to work, not sure what i was doing wrong (noob) but the debug_level trick worked for me :). awesome. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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 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). A good example of such a test is checking whether there are bad blocks on a disk. To do this: Navigate to Configuration > Command > New. 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. How to tell which packages are held back due to phased updates. To check whether a specific webpage is available, use the -u option as shown below. Repeat this procedure for each Ceph plug-in applicable to the node. Would you please be so kind as to help me? Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. Far better then Nagios documentation. Learn more. thanks! Check whether a document is older than x seconds. +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. Host is just like a computer; it can be a physical device or virtual. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. They may or may not work on: 44 # your system, as they must be modified for your plugins. Nagios understands the following exit codes: Thank you for any assistance you can provide. host_name Server01 2. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. They have a lot of advantages and some disadvantages. To figure this out I set nagios into debug mode with the configuration like this. 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. Depending on the status received on hosts and services, appropriate action is taken. 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. It is called NSCA (Nagios Service Check Acceptor). NRDP has several benefits over NSCA, including: Can I tell police to wait and call a lawyer when served with a search warrant? External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. 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 NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. In such cases, only reports regarding hard state changes are propagated across Nagios servers. 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 . If you want Nagios to treat all passive check results for hosts as if they were soft results, you need to enable the following option in the main Nagios configuration file: Passive service checks are very similar to passive host checks. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Active checks can be used to "poll" a device or service for status information every so often. 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 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). 1. 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. great! See Also: Active Checks, Service Checks, Host Checks. How to Install Nagios? 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. you have the flexibility of sending the passive check to Nagios with a different hostname. 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. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. 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. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. Check whether Apache HTTP is running on a remote server using check_http. The figure shown below shows a passive check . If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. How to install and configure nagios on centos 7 step by step ile ilikili ileri arayn ya da 22 milyondan fazla i ieriiyle dnyann en byk serbest alma pazarnda ie alm yapn. 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.cfg is the main configuration file for your Nagios Core. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). More information on cached checks can be found here. Nagios's primary mode of "service checking" is called an active check. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Here is my configuration : It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Passive service checks are often used to report the results of long lasting tests asynchronously. check_http: command not found. 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. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. Start the Nagios again. Get your subscription here. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. For example: 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. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. define service{ use generic-service host_name web1.onemetric.com.au service_description Uptime check_command snmp_Uptime!-C public } Adjust the commands as required. 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.