The line should look like: Define the standard checks that you will perform on every client with NRPE. Nagios: Simple Oracle Check. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. The default FQDN used for testing is www.google.com, but it can be changed as needed. Nagios allows applications and event handlers to send out passive check results for host objects. Another difference is that active checks require much less effort to be set up when compared to passive checks. Passive Checks and NSCA (Nagios Service Check Acceptor), Technology news, insights and tutorials from Packt, Top 6 Cybersecurity Books from Packt to Accelerate Your Career, Your Quick Introduction to Extended Events in Analysis Services from Blog, Logging the history of my past SQL Saturday presentations from Blog, Storage savings with Table Compression from Blog Posts SQLServerCentral, Daily Coping 31 Dec 2020 from Blog Posts SQLServerCentral, Learning Essential Linux Commands for Navigating the Shell Effectively, Exploring the Strategy Behavioral Design Pattern in Node.js, How to integrate a Medium editor in Angular 8, Implementing memory management with Golangs garbage collector, How to create sales analysis app in Qlik Sense using DAR, http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114, ExploringForms in Angular types, benefits and differences. More information on the NSCA addon can be found here. Attributes can be used for both hosts and services. Yeah, it's totally brute-force, but it works for me. To allow it to grow bigger before rotating, add more zeroes, for example. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The same queue that is used for storing results from active checks is also used to store the results from passive checks. NSClient++ includes a service module that can check if a service is running. 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 This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. In the first case, Nagios takes care of the scheduling, and the command only needs to perform the actual checks and mark the results as OK/WARNING/CRITICAL based on how a check command is configured. Nagios will be configured to monitor SMTP and mail queue of the server. Some of the scripts provided with Nagios are restricted to the local server only. VS Code extension | 35 comentarios en LinkedIn Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Save my name, email, and website in this browser for the next time I comment. 5 check_http Command Examples 1. It allows to configure alerts and has different states for them. Nagios check_by_ssh returns status 3 even though running the command manually works? Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. 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. On any device & OS. See the HTML : 45 Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. Default is HTTP/1. First you should define a command in the commands.cfg file. This is a plugin for Nagios wich you can use to check if a linux service is running. Active checks are initiated by Nagios process and then run on a regular scheduled basis. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Force a check and you will see exactly how the command is being run. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. Nagios can tell what the status of the service is by reading the exit code of the check. After defining the command you can associate that command to a service, and then to a host. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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 :). 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. These checks can provide useful insight on what is going on within the Nagios server. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. To turn on everything you want to set debug_level=4095. 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. The application can also periodically let Nagios know if it succeeded in using the database without problems. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. These checks help ensure that the dependency logic is as accurate as possible. An external application checks the status on hosts/services and writes the result to External Command File. Active checks can be used to "poll" a device or service for status information every so often. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? The results are passed to Nagios in the same way as they are passed for hosts. Architect and design WAP data flow using BigData Platform. The check logic inside Nagios process starts the Active check. 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. How can I manually run a nagios check from the command line? Agree 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. Unlike active checks, Nagios will not take network topology into consideration by default. $ check_http -H 192.168.1.50 HTTP OK HTTP/1.1 200 OK - 332 bytes in 0.004 seconds |time=0.004144s;;;0.000000 size=332B;;;0 2. host_name Server01 On a finishing note, Nagios can monitor many other sectors of a network. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. 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). 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. How to Install Nagios? When Nagios checks the status of services, it will be able to detect when a service changes between OK, WARNING, UNKNOWN, and CRITICAL states and take appropriate action. 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. 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 next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. We make use of First and third party cookies to improve our user experience. TRUST_EXIT_CODE=0 usage () { cat <<EOF 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 . The -S option is not working with 2.0 plugins. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. The sections below provide examples of how to perform these checks using different methods. When services change state too frequently they are considered to be "flapping". Affordable solution to train a team and make them project ready. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Fortra's Intermapper vs Kaseya Traverse: which is better? Monitoring Website URL Status Thanks for contributing an answer to Server Fault! Apply these agent configurations After the NRDP installation, install the NCPA. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. $ vi /usr/local/nagios/etc/servers/devserver.cfg It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. The figure shown below shows an active check . 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. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. 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. Submitting Passive Check Results From Remote Hosts. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, Or you can create a custom variable to store the port number , with your example: Otherwise we must rely on parsing the # output from the service management tool. 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. 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. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. 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. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. November 2012, by Simon Krenger. 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. 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. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. 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. If I used the first method, I have to keep separate site.pp for each environment. 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. This feature is only available to subscribers. 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). # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Learn more. 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. On-demand service checks are also run in parallel if needed. It says Unknown option specified in config file , check_http -I 10.0.0.76 -p 8192 url=/MYServiceBus/ post= eregi=.Status_Code.0./Status_Code. After installing nagios and nagios-plugins-all (via yum), I've c. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. The example contains partial output. Now send a trap and see how the service appears as in Nagios XI. 5 check_http examples This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. Pass the specified string as User Agent in HTTP header. Services are those which are used by Nagios to check something about a host. It says -S is for version. 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. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. Up To: Contents All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. You need to add the full path to it in the check_command. 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. Using the definition below, checks on the host will be performed after every 3 minutes. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. 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. On-demand checks are performed as part of the predictive service dependency check logic. 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. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. 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. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . 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. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. The host or the services will be tested again and again till the time the status is permanent. . When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. 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. 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. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. will hold the return value of commands between $( ). Hi, thanks for your comment. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Use Hiera. 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. Affordable solution to train a team and make them project ready. 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). Asking for help, clarification, or responding to other answers. You have entered an incorrect email address! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. 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 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 object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. This will give an idea on whether the execution will be successful and what the output of the script will look like. sudo usermod -aG docker kifarunix. Default is 10 seconds. To do this: Navigate to Configuration > Command > New. By default, Nagios handles results from active and passive checks differently. 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. A good example of such a test is checking whether there are bad blocks on a disk. I am gettinr this error in nagios3. Would you please be so kind as to help me? nagiosrpm. 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. 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. 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. Nagios executes event handlers to handle hard states. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. 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. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. Can i specify what a valid response is, i.e. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Far better then Nagios documentation. Far better then Nagios documentation. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. 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. 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. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. The processing of active and passive check results is essentially identical. Is there a more efficient way to do this? The flexibility provided by Nagios is perfect for these case scenarios. 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. 2022 Company, Inc. All rights reserved. NSCA stands for Nagios Service Check Acceptor. For example: This yields less output to dig through. Active checks are most common in the Nagios world. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Some methods support checking multiple services at once. The following diagram shows how both active and passive checks are performed by Nagios. Often, there are situations where active checks obviously fit better. Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. 2. 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. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). How can I get it to work with https with Nagios4 and plugins 2.x? So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! We can also do it at a contact level, by disabling notifications . From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. - 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]: This article assumes you have a working knowledge of Nagios. Try to put full path in the command line. All other servicemarks and trademarks are the property of their respective owner. Last updated on September 22, 2020 by Sarmed Rahman. Syntax and Options When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. First, install the Nagios Core server. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used.

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