Remember to allow the execution of the script: if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-4','ezslot_6',110,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-4-0'); The result is a text message and an exit code: This step will be the same with your own plugins, and if you download a third-party plugin from the internet as well. 5 check_http examples Server Fault is a question and answer site for system and network administrators. 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. 13. Check whether a document is older than x seconds. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. This can be done in addition to active checks, to identify critical problems earlier. The following line is commented out to make MySQL listens on all interfaces. Or you can create a custom variable to store the port number , with your example: So I decided to use the second method. 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. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. 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. For example, if you are bringing down your HTTP server everyday sometime between midnight and 1:59 a.m, you can specify the above "247-except-night-12-2" timeperiod in your service definition for the check_period and notification_period as shown below for your particular service definition. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Repeat this procedure for each Ceph plug-in applicable to the node. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. By using this website, you agree with our Cookies Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! By default, Nagios handles results from active and passive checks differently. Affordable solution to train a team and make them project ready. 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. 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 . The sections below provide examples of how to perform these checks using different methods. To allow it to grow bigger before rotating, add more zeroes, for example. The following screenshot shows a complete overview of all the service checks that have been configured so far. Now that the syntax is available, TCP port 80 can be checked as follows. If I used the first method, I have to keep separate site.pp for each environment. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! For example: Monitoring Log Messages with Nagios Passive Checks | ls -A Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. 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. 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 . Nagios ()_DevilRex119_51CTO 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. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. service_description check http://MYIP/test.php There are also different types of checks including external applications or devices that want to report information directly to Nagios. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. Learn more about Stack Overflow the company, and our products. NPCA includes a service module that can check if a service is stopped. Nagios provides a sample configuration file, that we will use. great! Passive checks are also used when configuring distributed or redundant monitoring installations. These plugin states directly translate to service states. The following diagram shows how both active and passive checks are performed by Nagios. rev2023.3.3.43278. Passive Checks with Nagios ADMIN Magazine 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. Add the command to the NRPE configuration file on the client (/etc/nagios/nrpe_local.cfg): Now we can access the server and test it like any standard plugin. b-b.mit.edu Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The best answers are voted up and rise to the top, Not the answer you're looking for? Fortra's Intermapper vs Kaseya Traverse: which is better? Is there a more efficient way to do this? Let's consider I have the Nagios server configured to alert only on critical status, so I want an alert if I have too many services on a Warning status. 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. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". Test Server 1: custom application (TCP Port. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. As mentioned earlier, Nagios can forgo the actual execution of an on-demand service check if it can use the cached results from a relatively recent service check. mark separates the command from the arguments in the check_command entry. i'm very new on that kind of progamming what does this line ", " means i really want to lear some but i need help please helpme. Would you please be so kind as to help me? 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. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. 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). Often, there are situations where active checks obviously fit better. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. 2022 Company, Inc. All rights reserved. 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. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. Nagios can be used to monitor Apache web server as well. These checks can provide useful insight on what is going on within the Nagios server. Nagios also supports a way to monitor hosts and services passively instead of actively. This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. 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. However, if there are no jobs to process and the application is not using it, Nagios will not have up-to-date information about the database. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. Expected response string. Active checks are most common in the Nagios world. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. 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. This usually calls for some effort. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. 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. All other servicemarks and trademarks are the property of their respective owner. Filters such as firewall and TCP wrappers should be used. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Fortra's Intermapper vs Kaseya Traverse vs Nagios XI comparison Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. Configuring a Nagios Monitoring System | Scaleway Documentation Some of the scripts provided with Nagios are restricted to the local server only. Remotely monitor servers with the Nagios check_by_ssh plugin VS Code extension | 35 comentarios en LinkedIn How to Install Nagios? For HTTPS running on a different port, do the following. This is very important in situations where a host behind a router is reported to be down because the router is actually down. Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. . This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Each server runs one or more common services. Service state changes can also trigger on-demand host checks. 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. The object file localhost.cfg allows for parameters to be passed to check_ssh. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. check_command check_http -H MYIP -u http://MYIP/test.php 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). The following file can be modified to do the job. 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. In order to use them, the host needs to be configured to accept passive checks results. . On-demand checks are performed as part of the predictive service dependency check logic. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . You can check whether a SSL certificate of the website expires within the next X number of days as shown below. awesome. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on On a finishing note, Nagios can monitor many other sectors of a network. Syntax and Options Another example is where an application already processes information such as network bandwidth utilization. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Monitoring Website URL Status Using Nagios check_http - ARKIT 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. Nagios: How to determine parameter order check_ssh 1. Nagios will ignore all check results for services that had not been configured before it was last (re)started. Use Puppet environments. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. This setting is done on all MySQL servers. JOB, On-demand as needed for predictive service dependency checks. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Nagios Turn Off All Notifications | 6 Methods Revealed Chapter 5. Configuring the Nagios Plugins for Ceph Method 3. Nagios can tell what the status of the service is by reading the exit code of the check. There would be many cases when the failures will happen randomly and they are temporary; hence Nagios uses states to check the current status of a host or service. 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. In the following example, we are checking whether the website certificate expires in the next 365 days. By using this website, you agree with our Cookies Policy. In this tutorial, the following three servers are being used.