It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Also, MySQL would not let just any host to connect to it. This user is then granted all permission to all databases and will be used for monitoring. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. By default you do not need to change any of the lines in this file and . Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. # Plugin commands (service and host check commands) # Arguments are likely to change between different . Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. As the Nagios toolsets, including NSCA (Nagios Service Check Acceptor for submitting passive check results to the Nagios core server) and NRPE (Nagios Remote Plugin Executor for accepting active check requests from the Nagios core server and send back the results), were initially only developed for Unix-based and Linux Operating Systems, 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. service_description check http://MYIP/test.php The method for using any of these "plugins" from the command line is the same as any other Linux script: Just run "./plugin-name" with the appropriate flags you want to check, and voila! 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. In the following example, we are checking whether the website certificate expires in the next 365 days. . In such cases, only reports regarding hard state changes are propagated across Nagios servers. Having managed large Nagios installations for many years, assigning services to hostgroups is an anti pattern and can make things complicated fast if your environment gets big. Some methods support checking multiple services at once. hello.. 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. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. 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. Each server runs one or more common services. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! Making statements based on opinion; back them up with references or personal experience. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. 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. Are there tables of wastage rates for different fruit and veg? Previous parts of this book often mentioned Nagios performing checks on various software and machines. Nagios understands the following exit codes: On a finishing note, Nagios can monitor many other sectors of a network. 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). Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. Here is my configuration : 2. More information on cached checks can be found here. Repeat this procedure for each Ceph plug-in applicable to the node. 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. Remember that the $USER1$ variable, is a local Nagios variable set in the resource.cfg file, in my case pointing to /usr/local/nagios/libexec. 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. Nagios also offers another way to work with the statuses of hosts and services. How can I get it to work with https with Nagios4 and plugins 2.x? 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). The default FQDN used for testing is www.google.com, but it can be changed as needed. See the HTML : 45 Manual tuning is needed to tell MySQL to listen on other interfaces as well. 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 enable passive checks in Nagios, you'll need to do the following: If you want to disable processing of passive checks on a global basis, set the accept_passive_service_checks directive to 0. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. When services change state too frequently they are considered to be "flapping". Nagios's primary mode of "service checking" is called an active check. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. Active checks can be used to "poll" a device or service for status information every so often. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Another difference is that active checks require much less effort to be set up when compared to passive checks. All other servicemarks and trademarks are the property of their respective owner. 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. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. 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. (1)Nagios. 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. To do this: Navigate to Configuration > Command > New. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. If you want know more, just read and play with: I'm new to shell and would like to understand and adapt your script would you comment on why this particular adaptation wont work (results unknown - 0 regardless of input parameter sent by the user), countWarnings=$(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5), echo "example: plugin.sh minimal_counter_for_warning_alert counter_for_critical_alert", if (($warn<=$countWarnings ||$countWarnings==0)); then, echo "OK - $countWarnings services in Warning state", elif (($warn<$countWarnings && $countWarnings<=$crit)); then, echo "WARNING - $countWarnings services in Warning state", echo "CRITICAL - $countWarnings services in Warning state", [emailprotected]:/usr/local/nagios/libexec$ echo $(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5). This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Stop once the headers are downloaded. Nagios executes event handlers to handle hard states. Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. 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. 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). How to Install Nagios? Last updated on September 22, 2020 by Sarmed Rahman. Do not wait for whole document body to download. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. There are no attachments for this article. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Check whether Apache HTTPS is running on a remote server using check_http. 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. In this tutorial, the following three servers are being used. 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. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. The processing of active and passive check results is essentially identical. It is vital to make sure only legitimate networks have access to the database. More information on how this works can be found here. After defining the command you can associate that command to a service, and then to a host. This is how your host definitions look currently . . thank you! It only takes a minute to sign up. 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. This way, the other applications on your Nagios server can report the status of the hosts. Nagios Core and Nagios XI has a features to monitoring website URL status. Nonetheless, they can be tuned to match the requirements. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. Nagios also offers a way of combining the benefits of both active and passive checks. It has been designed to run . 5 check_http examples This can be done in addition to active checks, to identify critical problems earlier. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. I just used that simple script as an example, any language can be used to write your own custom plugin. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. Default is HTTP/1. can anyone help me out for this problem:-, Check-Website-Response The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. 5 check_http Command Examples 1. The plugin returns a CRITICAL state if the service is not started. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. For instance, a model for the file could be: The idea of having that generic file is so that you can check the same on every client. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. 13. The application can also periodically let Nagios know if it succeeded in using the database without problems. Default is 80, This will use HTTPS using default 443 port. First, the servers are defined in Nagios. Force a check and you will see exactly how the command is being run. 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. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. The time performed is specified in seconds. 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. The following figure shows soft states and hard states. will hold the return value of commands between $( ). 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 . just because i had already looked in the commands.cfg file to figure out which commands were running, but i wanted to know what flags were being set. Active checks are initiated by Nagios process and then run on a regular scheduled basis. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile In many cases, the time taken is not enough, as some checks need to be performed over a longer period of time to have satisfactory results. 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. Services are those which are used by Nagios to check something about a host. 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). So the Nagios Core version is 3.5.1. The figure shown below shows a passive check . It's pretty simple. I am running into the same problem as David thanks! Complete a blank sample electronically to Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. We can also do it at a contact level, by disabling notifications . The following screenshot shows a complete overview of all the service checks that have been configured so far. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). The sections below provide examples of how to perform these checks using different methods. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Agree In an earlier post, I showed how to . Some of the scripts provided with Nagios are restricted to the local server only. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. The external application writes the results of the check to the. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Apply these agent configurations After the NRDP installation, install the NCPA. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. Expected response string. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Detecting and dealing with state changes is what Nagios is all about. How to install and configure Nagios Core. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. 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. This can be done to gather all critical errors to a single, central place. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. Is there a more efficient way to do this? As with passive checks of hosts, all that is needed is to enable the global Nagios option to accept passive check results, and also enable this option for each service that should allow the passing of passive check results. 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. Service state changes can also trigger on-demand host checks. The best answers are voted up and rise to the top, Not the answer you're looking for? 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). TRUST_EXIT_CODE=0 usage () { cat <<EOF If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. You need to add the full path to it in the check_command. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. I am gettinr this error in nagios3. command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Nagios allows applications and event handlers to send out passive check results for host objects. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. We make use of First and third party cookies to improve our user experience. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Otherwise we must rely on parsing the # output from the service management tool. NSClient++ includes a service module that can check if a service is stopped. This yields less output to dig through. That is superb artile I was looking for! For those unfamiliar with Nagios, it is a monitoring system which can execute checks. The object file localhost.cfg allows for parameters to be passed to check_ssh. On-demand service checks are also run in parallel if needed. mark separates the command from the arguments in the check_command entry. 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. These are executed on regular intervals, as defined by check_interval and retry_interval. No software installation. For HTTPS running on a different port, do the following. 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. They may or may not work on: 44 # your system, as they must be modified for your plugins. Here is another example to check CPU: nagios will indicate warning if the % cpu utilized by any process is greater than 70% and will indicate critical alert if the % cpu is greater that 80% Passive service checks are often used to report the results of long lasting tests asynchronously. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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. A user [emailprotected] is created in MySQL server. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. 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. 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. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. (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".) 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. Follow these steps to install the plugin: Download the plugin. How can I make Status Information for Nagios services easier to read? Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. It is possible to configure Nagios so that it will receive status information sent over a command pipe. . 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. Active checks are most common in the Nagios world. 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. First you should define a command in the commands.cfg file. Is it possible to check a web page through an authenticated proxy server? We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. Now in your configuration for checks for a host you can create the following service check. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. 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. Often, there are situations where active checks obviously fit better. 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). Or you can create a custom variable to store the port number , with your example: The plugin returns a CRITICAL state if the service is not started. 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. 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 will be configured to monitor SMTP and mail queue of the server. To turn on everything you want to set debug_level=4095. This setting is done on all MySQL servers. 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. NPCA includes a service module that can check if a service is running. The documentation uses the example of: for . External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Nagios: Simple Oracle Check. 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. It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file Thank you for any assistance you can provide. VS Code extension | 35 comentarios en LinkedIn To figure this out I set nagios into debug mode with the configuration like this. A good example would be a server that is a part of an application, processing job queues using a database. Thanks for contributing an answer to Server Fault! Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Giving material.angular.io a refresh from Angular Blog Medium. As mentioned earlier, server-2 has postfix mail server set up on it. It can report each problem when accessing the database. If you would like to use the whole or any part of this article, you need to cite this web page at Xmodulo.com as the original source. Check WMI Plus includes a service module that can check if a service is stopped. This command accepts the host name, status code, and the textual output from a check. Kaydolmak ve ilere teklif vermek cretsizdir. This usually calls for some effort. The following settings are done for all MySQL servers. 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. In the Select resource macro: section, select USER1. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. How can I manually run a nagios check from the command line? The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. Monitor whether the apache server is available. This feature is only available to subscribers. 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. # SAMPLE HOST CHECK .
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