nagios service check example

First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. 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. 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. Passive service checks are often used to report the results of long lasting tests asynchronously. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. The same queue that is used for storing results from active checks is also used to store the results from passive checks. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Let us see an example to perform checks on host . Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. 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. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. i.e: 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 cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. It shows what is performed by Nagios in both cases and what needs to be done by the check command or an external application for passive checks. How can I make Status Information for Nagios services easier to read? vegan) just to try it, does this inconvenience the caterers and staff? Furthermore , Nagios can also check whether TCP port 80 (web server) is reachable e.g., the server is online but Apache/IIS is not responding. Check WMI Plus includes a service module that can check if a service is stopped. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! Learn more. There are several different use cases covered in this KB article: The sections below provide examples of how to perform these checks using different methods. It has been designed to run . In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: This allows for seamless integration of status information from external applications with Nagios. - 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]: . 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. Here is how it can be done. In such a case, checks are done by other programs, and their results are sent to Nagios. Nagios can tell what the status of the service is by reading the exit code of the check. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. So the Nagios Core version is 3.5.1. check_http: command not found. The following is a sample script that will accept the host name, status code, and output from a check and will submit these to Nagios: As an example of the use of this script, the command that is sent to Nagios for host01, status code 2 (UNREACHABLE) and output router 192.168.1.2 down would be as follows: When submitting results, it is worth noting that Nagios might take some time to process them, depending on the intervals between Nagios checks of the external command pipe. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. 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. . One of the problems is that such checks can take only a couple of seconds to completea typical timeout for an active check to complete is 10 or 30 seconds. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. 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. 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. does the HTML display xx welcome xx? Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. 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. 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. 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. Viewed 12725 times since Tue, Nov 14, 2017, Viewed 18667 times since Tue, Nov 28, 2017, Viewed 70502 times since Thu, Nov 9, 2017, Viewed 9709 times since Tue, Nov 14, 2017, Viewed 12197 times since Wed, Nov 29, 2017, Viewed 47389 times since Thu, Nov 9, 2017, Viewed 14647 times since Sun, Nov 26, 2017, Viewed 42173 times since Mon, Nov 13, 2017, Viewed 18034 times since Wed, Nov 15, 2017, Viewed 22586 times since Sun, Nov 26, 2017. I've provided some comments here, but things may not be so # clear without further explanation. 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). NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Let us see an example to perform checks on host Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. This can be done in addition to active checks, to identify critical problems earlier. Otherwise we must rely on parsing the # output from the service management tool. NSCA stands for Nagios Service Check Acceptor. More information on how this works can be found here. No software installation. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. . The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. For example . The following line is commented out to make MySQL listens on all interfaces. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Yeah, it's totally brute-force, but it works for me. The sections below provide examples of how to perform these checks using different methods. Services are those which are used by Nagios to check something about a host. 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. It also defines Nagios user and group under which Nagios instance is running. Is it possible to check a web page through an authenticated proxy server? The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. NSClient++ includes a service module that can check if a service is stopped. For example, to set up a very similar service, all we need to do is to use the same parameters as those for the hosts: In this case, Nagios will never perform any active checks on its own and will only rely on the results that are passed to it. Active checks are initiated by Nagios process and then run on a regular scheduled basis. Nagios: Simple Oracle Check. I am gettinr this error in nagios3. notifications_enabled 0 Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. These checks are useful when you cannot monitor hosts/services on a regular basis. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 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. How can we prove that the supernatural or paranormal doesn't exist? A major difference between hosts and services is that service checks differentiate between soft and hard states. If you preorder a special airline meal (e.g. Fortra's Intermapper vs Kaseya Traverse: which is better? /usr/nagios/libexec/check_http .. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. When Nagios plans and receives results from active checks, it takes the actual network topology into consideration and performs a translation of the states based on this. This is very important in situations where a host behind a router is reported to be down because the router is actually down. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. 2022 Company, Inc. All rights reserved. this is more along the lines of what i meant. 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. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. Attributes can be used for both hosts and services. For HTTPS running on a different port, do the following. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Active checks can be used to "poll" a device or service for status information every so often. The application can also periodically let Nagios know if it succeeded in using the database without problems. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. See the HTML : 45 Passive checks are performed by external processes and the results are given back to Nagios for processing. 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. Now let us add check_interval directive. This article assumes you have a working knowledge of Nagios. See Also: Active Checks, Service Checks, Host Checks. This will give an idea on whether the execution will be successful and what the output of the script will look like. 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. To identify the status of a monitored service, Nagios runs a check plugin on it. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. How Nagios process handles passive check results can be defined in the main Nagios configuration file. The check logic inside Nagios process starts the Active check. This can be done to gather all critical errors to a single, central place. Nagios check_by_ssh returns status 3 even though running the command manually works? 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. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. It allows to configure alerts and has different states for them. Nagios: Disable notifications from command line on Windows/Linux. host_name Server01 Is there a proper earth ground point in this switch box? 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. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. Is there a more efficient way to do this? If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. Kaydolmak ve ilere teklif vermek cretsizdir. 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. Nagios also supports a way to monitor hosts and services passively instead of actively. First, the servers are defined in Nagios. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file Nagios also offers a way of combining the benefits of both active and passive checks. 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. The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. By using this website, you agree with our Cookies Policy. Giving material.angular.io a refresh from Angular Blog Medium. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. The following figure shows soft states and hard states. A user [emailprotected] is created in MySQL server. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. More information on dependencies can be found here. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. In order to use them, the host needs to be configured to accept passive checks results. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Filters such as firewall and TCP wrappers should be used. 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. 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. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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). Securely download your document with other editable templates, any time, with PDFfiller. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. this is THE MOST comprehensive and straight forward turorial I've seen. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. There are no attachments for this article. # Nagios Exit Codes OK=0 WARNING=1 CRITICAL=2 UNKNOWN=3 # Weather or not we can trust the exit code from the service management tool. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. The line should look like: Define the standard checks that you will perform on every client with NRPE. Hi, thanks for your comment. Rather, Nagios takes the passive check result to be the actual state the host is in and doesn't try to determine the host's actual state using the reachability logic. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. 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. The check_init_service plugin does not support checking multiple services. Also, MySQL would not let just any host to connect to it. 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). It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Often, there are situations where active checks obviously fit better. This usually calls for some effort. Nagios can tell what the status of the service is by reading the exit code of the check. The -S option is not working with 2.0 plugins. Unlike active checks, Nagios will not take network topology into consideration by default. The provided scripts contain help on the syntax. Another example is where an application already processes information such as network bandwidth utilization. Nagios dependencies.cfg example file. Now send a trap and see how the service appears as in Nagios XI. We can also do it at a contact level, by disabling notifications . This is a plugin for Nagios wich you can use to check if a linux service is running. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. NSClient++ includes a service module that can check if a service is running. NPCA includes a service module that can check if a service is stopped. 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. 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). For those unfamiliar with Nagios, it is a monitoring system which can execute checks. 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. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. In the Select resource macro: section, select USER1. Submitting Passive Check Results From Remote Hosts. The example contains partial output. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. In other cases, passive checks are the way to go. In fact, we officially. First, install the Nagios Core server. On any device & OS. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. 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. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. 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. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. That is superb artile I was looking for! Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. 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.

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