nagios service check example
Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. The plugin returns a CRITICAL state if the service is not started. Here is my configuration : Submitting Passive Host Check Results External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. notifications_enabled 0 When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. . 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). 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. Monitor whether the apache server is available. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. The host or the services will be tested again and again till the time the status is permanent. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Manual tuning is needed to tell MySQL to listen on other interfaces as well. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. The output indicates that it expires in 300 days. Hosts and service configurations are the building blocks of Nagios Core. 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. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. I am running into the same problem as David The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). For HTTPS running on a different port, do the following. It only takes a minute to sign up. Define the checks on /etc/nagios/nrpe_local.cfg. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Pass the specified string as User Agent in HTTP header. Do not wait for whole document body to download. A major difference between hosts and services is that service checks differentiate between soft and hard states. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How to handle a hobby that makes income in US. How to use it? The following diagram shows how both active and passive checks are performed by Nagios. Nagios.cfg is the main configuration file for your Nagios Core. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. 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. You can create a host file inside the server directory of Nagios and mention the host and service definitions. See the HTML : 45 Passive service checks are often used to report the results of long lasting tests asynchronously. 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. 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. 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. I've: 5 # provided some comments here, but things may not be so clear without further . I Have problem with the check_http when I try ur command test , I have the next message : Save my name, email, and website in this browser for the next time I comment. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. It says -S is for version. 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. . NSCA stands for Nagios Service Check Acceptor. Passive checks are initiated and performed by external applications/processes, Passive check results are submitted to Nagios for processing, Asynchronous in nature and cannot be monitored effectively by polling their status on a regularly scheduled basis, Located behind a firewall and cannot be checked actively from the monitoring host. 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. 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. Is there a more efficient way to do this? In such cases, only reports regarding hard state changes are propagated across Nagios servers. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. Method 3. How Nagios process handles passive check results can be defined in the main Nagios configuration file. As an example of the use of this script, the command that is sent to Nagios for host01, service PING, status code 0 (OK) and output RTT=57 ms is as follows: A very common scenario for using passive checks is a check that takes a very long time to complete. To do this: Navigate to Configuration > Command > New. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. Nagios allows applications and event handlers to send out passive check results for host objects. does the HTML display xx welcome xx? Giving material.angular.io a refresh from Angular Blog Medium. 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. Apply these agent configurations After the NRDP installation, install the NCPA. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Nagios: Disable notifications from command line on Windows/Linux. 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. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Nagios can be used to monitor Apache web server as well. Filters such as firewall and TCP wrappers should be used. The processing of active and passive check results is essentially identical. If you would like to disable passive checks for just a few hosts or services, use the passive_checks_enabled directive in the host and/or service definitions to do so. The following figure shows soft states and hard states. Establish a terminal session to your Nagios XI server and execute the following command: }. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). /usr/nagios/libexec/check_http .. 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 . (In this example, the script will print All ok and it will exit with 0, the OK . The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. All other servicemarks and trademarks are the property of their respective owner. I will use a simple example. Service status codes are the same as those for active checks0 for OK, 1 for WARNING, 2 for CRITICAL, and 3 for an UNKNOWN state. Add additional tags that should be sent in the HTTP header. nagiosrpm. Previous parts of this book often mentioned Nagios performing checks on various software and machines. It will give you all the available options: Service - Started Check to see if a service is started. However, in a big environment it is very likely to need some custom checks for specific uses, for instance: Checking on a certain task result, monitoring an in-house developed application, among others. Related Commands. If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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). Each server runs one or more common services. Nagios also offers a way of combining the benefits of both active and passive checks. These checks are useful when you cannot monitor hosts/services on a regular basis. The __HOST__ is a special service name, which represents the host check in Nagios. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. great! Is there a proper earth ground point in this switch box? First, the servers are defined in Nagios. Next, update the remote Docker daemon DNS details on your hosts file if there is no local DNS; sudo tee -a "192.168.59.48 docker01.kifarunix.com docker01" >> /etc/hosts. No software installation. In Nagios, 2 types of checks are performed on hosts and services . Nagios comes with a wide range of built-in scripts for monitoring services. This increases the security of the database. The sections below provide examples of how to perform these checks using different methods. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . Let us assume that the following custom application is also running in the network, listening on a particular port. Try to put full path in the command line. To keep the article focused on service monitoring, we will not be configuring hostgroups or templates, as they have been covered in the previous tutorial. 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 best answers are voted up and rise to the top, Not the answer you're looking for? Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! And in Puppet agent, I have to define the environment (Dev, Test or Prod). (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. So the Nagios Core version is 3.5.1. Making statements based on opinion; back them up with references or personal experience. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Use Puppet environments. 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. 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 following screenshot shows a complete overview of all the service checks that have been configured so far. 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. 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. 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. Sometimes I find it tricky figuring out exactly what a plugin is doing. All other servicemarks and trademarks are the property of their respective owner. Some methods support checking multiple services at once. Attributes can be used for both hosts and services. A user nagios is created for both localhost and for any host. This task is really easy as Nagios has a built-in command for this. The documentation uses the example of: for . 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. 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. - specific URL support - ssl option - alternative port - fake user agent - proxy as parameter - proxy from environment variable Usage: check_website [OPTIONS] {HOSTNAME} {HOSTNAME} host to check (dns/ip) [OPTIONS]: 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. Test Server 1: custom application (TCP Port. 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. To figure this out I set nagios into debug mode with the configuration like this. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. This is how your host definitions look currently . On-demand as needed for predictive service dependency checks. Check whether a document is older than x seconds. 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. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Note that all the configuration in this section is done on the client to be checked, not in the nagios server. 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. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. This setting is done on all MySQL servers. 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. Often, you have situations where other applications can report if a certain service is working properly or not. 2022 Company, Inc. All rights reserved. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. . In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. Or you can create a custom variable to store the port number , with your example: In the following example, we are checking whether the website certificate expires in the next 365 days. It is possible to configure Nagios so that it will receive status information sent over a command pipe. 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. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Get your subscription here. 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. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. You have entered an incorrect email address! This user is then granted all permission to all databases and will be used for monitoring. By using this website, you agree with our Cookies Policy. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. The figure shown below shows a passive check . Are there tables of wastage rates for different fruit and veg? NRDP has several benefits over NSCA, including: There are many more services in Nagios which can be used to monitor pretty much anything on the running host. 13. Copy the configuration file to the Apache directory: /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.conf Install the Nagios Plugins to have a set of tools to monitor your different services: apt install build-essential libssl-dev gcc There are no attachments for this article. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. On any device & OS. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. Submitting Passive Check Results From Remote Hosts. Agree By default you do not need to change any of the lines in this file and . Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. Cached checks will only provide a performance increase if you are making use of service dependencies. 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. More information on the flap detection logic can be found here. Services are those which are used by Nagios to check something about a host. It's pretty simple. 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 :). Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. 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). You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. # SAMPLE HOST CHECK . This can be done in addition to active checks, to identify critical problems earlier. An external application checks the status of a host or service. 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 tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. Stop once the headers are downloaded. The following file can be modified to do the job. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. Nagios Core and Nagios XI has a features to monitoring website URL status. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. See Also: Active Checks, Service Checks, Host Checks. This is a plugin for Nagios wich you can use to check if a linux service is running. use generic-service ; Name of service template to use Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. More information on the NSCA addon can be found here. This example is going to restart the crond service as it is unlikely to cause any issues. Check whether Apache HTTPS is running on a remote server using check_http. The above definitions add a host called ubuntu_host and defines the services which will run on this host. 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. 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. Asking for help, clarification, or responding to other answers. awesome. 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. How can we prove that the supernatural or paranormal doesn't exist? 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. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. In the Select resource macro: section, select USER1. In fact, we officially. you have the flexibility of sending the passive check to Nagios with a different hostname. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. Up To: Contents For those unfamiliar with Nagios, it is a monitoring system which can execute checks. 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. 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. 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.
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