nagios service check example

The check_init_service plugin does not support checking multiple services. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? This is how your host definitions look currently . How can I get it to work with https with Nagios4 and plugins 2.x? This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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). 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. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. notifications_enabled 0 This can be done in addition to active checks, to identify critical problems earlier. More information on the NSCA addon can be found here. Far better then Nagios documentation. nagiosrpm. This usually calls for some effort. Hi, this is a fantastic article, i managed to learn how to make plugins myself. Sometimes I find it tricky figuring out exactly what a plugin is doing. Save my name, email, and website in this browser for the next time I comment. In an earlier post, I showed how to . The service check runs in a child process that was fork()ed from the main Nagios daemon. nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. Check whether a document is older than x seconds. How to use it? Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. In such cases, only reports regarding hard state changes are propagated across Nagios servers. The provided scripts contain help on the syntax. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. We can also do it at a contact level, by disabling notifications . In order to use them, the host needs to be configured to accept passive checks results. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . The external application writes the results of the check to the. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Method 2. 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. does the HTML display xx welcome xx? I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. 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. 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. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. To allow it to grow bigger before rotating, add more zeroes, for example. Nagios allows applications and event handlers to send out passive check results for host objects. 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. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. If you preorder a special airline meal (e.g. Nagios dependencies.cfg example file. Passive service checks are often used to report the results of long lasting tests asynchronously. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. The plugin returns a CRITICAL state if the service is not started. this is THE MOST comprehensive and straight forward turorial I've seen. When new information regarding a service gets passed to Nagios via the external commands pipe, Nagios treats it the same way as if it had been received by an active check. To do this: Navigate to Configuration > Command > New. Now let us add check_interval directive. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. These checks help ensure that the dependency logic is as accurate as possible. It is possible to configure Nagios so that it will receive status information sent over a command pipe. More information on dependencies can be found here. Nagioshttpdgccgd. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Set enable_notifications=0 in nagios.cfg. The following figure shows soft states and hard states. 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. 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). Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Nagios comes with a wide range of built-in scripts for monitoring services. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. 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. # Defaults to 0, put to 1 for systemd. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! 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. NSClient++ includes a service module that can check if a service is stopped. Or you can create a custom variable to store the port number , with your example: In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. A major difference between hosts and services is that service checks differentiate between soft and hard states. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. NSClient++ includes a service module that can check if a service is running. Nagios can check whether the server is online by running ping on the IP/name of the server as well as it can be set up to provide warnings in case the round trip time (RTT) to the server increases. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. 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. 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. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Hosts and service configurations are the building blocks of Nagios Core. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. VS Code extension | 35 comentarios en LinkedIn This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. NPCA includes a service module that can check if a service is running. 5 check_http Command Examples 1. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 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. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. See the HTML : 45 So the Nagios Core version is 3.5.1. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. When it is an active check result, Nagios takes the fact that switch1 is down into account and maps the child nodes result into an UNREACHABLE state. 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. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Nagios also offers another way to work with the statuses of hosts and services. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). Monitoring Website URL Status The example contains partial output. On-demand checks are performed as part of the predictive service dependency check logic. This can cause problems if you are submitting passive checks from a remote host or you have a distributed monitoring setup where the parent/child host relationships are different. 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. Up To: Contents I'd like to use the command line to run that particular check and get the output. 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. I just used that simple script as an example, any language can be used to write your own custom plugin. All other servicemarks and trademarks are the property of their respective owner. It has been designed to run . That is superb artile I was looking for! Nagios.cfg is the main configuration file for your Nagios Core. 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! (In this example, the script will print All ok and it will exit with 0, the OK . Thanks for contributing an answer to Server Fault! Service - Started Check to see if a service is started. great! Here is an example set of passive checks that . If I used the first method, I have to keep separate site.pp for each environment. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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. 03-16-2010, 10:31 AM . 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. The sections below provide examples of how to perform these checks using different methods. 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 nagios.cfg. So I decided to use the second method. With a little tweaking, Nagios can help monitor this application port as well. 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. host_name Server01 More information on how this works can be found here. First, the servers are defined in Nagios. You might also want to give the 'capture' plugin a try. There are also different types of checks including external applications or devices that want to report information directly to Nagios. This is a plugin for Nagios wich you can use to check if a linux service is running. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. 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. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Default is HTTP/1. Nagios will be configured to monitor SMTP and mail queue of the server. This can be done to gather all critical errors to a single, central place. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. 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. After defining the command you can associate that command to a service, and then to a host. sudo usermod -aG docker kifarunix. 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. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. By using this website, you agree with our Cookies Policy. service_description check http://MYIP/test.php Now that the syntax is available, TCP port 80 can be checked as follows. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. 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. (If I were running df -h on the linux CLI, I'm using the "h" flag - in the case of the df command, the h stands for "human readable".) We make use of First and third party cookies to improve our user experience. Add additional tags that should be sent in the HTTP header. The following file can be modified to do the job. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Let us see an example to perform checks on host . It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Affordable solution to train a team and make them project ready. A good example of such a test is checking whether there are bad blocks on a disk. # These are some example service check commands. 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). Some of the scripts provided with Nagios are restricted to the local server only. 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). Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. 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. 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. Kaydolmak ve ilere teklif vermek cretsizdir. 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. I don't know if it's best practice or not , but i would declare count Warnings as an integer variable when doing arithmetic operations. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. . Why is there a voltage on my HDMI and coaxial cables? I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! November 2012, by Simon Krenger. can anyone help me out for this problem:-, Check-Website-Response The output indicates that it expires in 300 days. 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'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. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. 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. Passive checks are also used when configuring distributed or redundant monitoring installations. Start the Nagios again. you have the flexibility of sending the passive check to Nagios with a different hostname. The default FQDN used for testing is www.google.com, but it can be changed as needed. 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. I Have problem with the check_http when I try ur command test , I have the next message : (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. 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). Can i specify what a valid response is, i.e. On-demand as needed for predictive service dependency checks. The results are passed to Nagios in the same way as they are passed for hosts. # Plugin commands (service and host check commands) # Arguments are likely to change between different . Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Now send a trap and see how the service appears as in Nagios XI. Cached checks will only provide a performance increase if you are making use of service dependencies. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Host is just like a computer; it can be a physical device or virtual. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. this is more along the lines of what i meant. 13. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Even the location of the plugins directory is in there. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. It's pretty simple. Nagios can tell what the status of the service is by reading the exit code of the check. 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. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Learn more. You know the basics on Nagios administration.

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