nagios service check example

i.e: The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: define host { use generic-host host_name linuxbox01 address 10.0.2.1 Test Server 1: custom application (TCP Port. 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. 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. Connect and share knowledge within a single location that is structured and easy to search. I've provided some comments here, but things may not be so # clear without further explanation. }. Monitoring Log Messages with Nagios Passive Checks | ls -A Nagios Monitoring Hosts with check_ping - Stack Overflow 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. If you preorder a special airline meal (e.g. Even the location of the plugins directory is in there. For Nagios, many, many Oracle plugins are available for checking database availability and performance. 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. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. Services are those which are used by Nagios to check something about a host. (In this example, the script will print All ok and it will exit with 0, the OK . Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. /usr/nagios/libexec/check_http .. Nagios will ignore all check results for services that had not been configured before it was last (re)started. It allows to configure alerts and has different states for them. Active checks are most common in the Nagios world. Monitoring Windows hosts with NSClient++: Service and system checks +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. Now that the syntax is available, TCP port 80 can be checked as follows. We can also configure Nagios so that if no new information has been provided within a certain period of time, it will use active checks to get the current status of the host or service. The -S option is not working with 2.0 plugins. Service state changes can also trigger on-demand host checks. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. checkcommands.cfg in noc/nagios - scripts.mit.edu In an earlier post, I showed how to . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Passive Checks and NSCA (Nagios Service Check Acceptor) Note that all the configuration in this section is done on the client to be checked, not in the nagios server. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: How can I manually run a nagios check from the command line? In such cases, only reports regarding hard state changes are propagated across Nagios servers. Install And Configure Nagios On Linux - LogicWeb It says -S is for version. 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. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. It is called NSCA (Nagios Service Check Acceptor). Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. It has been designed to run . 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. 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. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. Passive Checks - Nagios This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. Last updated on September 22, 2020 by Sarmed Rahman. Services are those which are used by Nagios to check something about a host. NPCA includes a service module that can check if a service is stopped. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. This command accepts the host name, status code, and the textual output from a check. Repeat this procedure for each Ceph plug-in applicable to the node. More information on how this works can be found here. Nagios understands the following exit codes: To turn on everything you want to set debug_level=4095. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . The external application writes the results of the check to the. This can be done to gather all critical errors to a single, central place. Select check_cluster from the plugin pop-up menu. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. I will use a simple example. How to install and configure nagios on centos 7 step by step leri November 2012, by Simon Krenger. The object file localhost.cfg allows for parameters to be passed to check_ssh. 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. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. The plugin returns a CRITICAL state if the service is not started. To allow it to grow bigger before rotating, add more zeroes, for example. 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. How to configure service templates - GroundWork Support Thank you for any assistance you can provide. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. In this tutorial, the following three servers are being used. Nagios ()_DevilRex119_51CTO Fortra's Intermapper vs Kaseya Traverse vs Nagios XI comparison will hold the return value of commands between $( ). TRUST_EXIT_CODE=0 usage () { cat <<EOF The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . 1. We make use of First and third party cookies to improve our user experience. 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. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Far better then Nagios documentation. The following line is commented out to make MySQL listens on all interfaces. [SOLVED] Nagios dependencies.cfg example file 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). The check logic inside Nagios process starts the Active check. How to Define Nagios Timeperiod Exclude for Maintenance Window 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). Nagios dependencies.cfg example file. 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. can nagios adjust its check time based on the status info? A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). 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. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. 5 check_http examples I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. This feature is only available to subscribers. You need to add the full path to it in the check_command. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. 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. Here is how it can be done. Default is 80, This will use HTTPS using default 443 port. 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. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. After installing nagios and nagios-plugins-all (via yum), I've c. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. UNKNOWN 2013-04-25 18:11:24 0d 0h 55m 37s 4/4 RESPONSE: UNKNOWN ERROR: /usr/bin/nc does does not exist, i am really getting frustrate from this nagios error, nitin: you need to install the netcat package for your distribution which will provide /usr/bin/nc, I had been using this plugin for a while. 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. Would you please be so kind as to help me? define service{ NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Scheduled service checks are run in parallel. Otherwise we must rely on parsing the # output from the service management tool. Save my name, email, and website in this browser for the next time I comment. Nagios configuration - How to configure Nagios - GeekPeek.Net What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? How can we prove that the supernatural or paranormal doesn't exist? My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Agree More information on dependencies can be found here. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. . How to use check_cluster to monitor service availability of multiple They may or may not work on: 44 # your system, as they must be modified for your plugins. I just used that simple script as an example, any language can be used to write your own custom plugin. 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. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. . 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. Learn more. 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. # 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. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). NRDP has several benefits over NSCA, including: In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). 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. 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. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. As mentioned earlier, server-2 has postfix mail server set up on it. The Nagios Service Check Acceptor (NSCA ) addon has historically been the addon of choice for Nagios administrators that need to establish data feeds or passive check transmission between Nagios installations. 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. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. A good example of such a test is checking whether there are bad blocks on a disk. These checks help ensure that the dependency logic is as accurate as possible. Nagios Core and Nagios XI has a features to monitoring website URL status. 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% Does a summoned creature play immediately after being summoned by a ready action? Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Check WMI Plus includes a service module that can check if a service is running. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. I 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! To figure this out I set nagios into debug mode with the configuration like this. . The following file can be modified to do the job. This yields less output to dig through. This increases the security of the database. The first thing that needs to be done in order to use passive checks for your Nagios setup is to make sure that you have the following options in your main Nagios configuration file: It would also be good to enable the logging of incoming passive checksthis makes determining the problem of not processing a passive check much easier. mark separates the command from the arguments in the check_command entry. vegan) just to try it, does this inconvenience the caterers and staff? Brian Murphy - Senior Infrastructure Engineer - Blue Cross and Blue Nagios can tell what the status of the service is by reading the exit code of the check. 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. 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 can tell what the status of the service is by reading the exit code of the check. Do not wait for whole document body to download. There are no attachments for this article. 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. # SAMPLE HOST CHECK . How to Write a Custom Nagios Check Plugin - HowtoForge Nagios: Simple Oracle Check. On any device & OS. Nagios: How to determine parameter order check_ssh Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. NPCA includes a service module that can check if a service is running. Nagioshttpdgccgd. Nagios check_dns / check_ip Example - Nagios Exchange Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Far better then Nagios documentation. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. NSCA stands for Nagios Service Check Acceptor. 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. Use this Nagios monitoring tutorial for proactive IT monitoring Learn more about Stack Overflow the company, and our products. Sometimes I find it tricky figuring out exactly what a plugin is doing. These types of checks are called Active Checks. In this way, NSCA communication sent over the Internet is more secure. This way, the other applications on your Nagios server can report the status of the hosts. We make use of First and third party cookies to improve our user experience. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. 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. 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. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation You know the basics on Nagios administration. Nagios: Simple Oracle Check - Simon Krenger We can also do it at a contact level, by disabling notifications . 2. This article assumes you have a working knowledge of Nagios. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. This is a plugin for Nagios wich you can use to check if a linux service is running. The time performed is specified in seconds. Up To: Contents Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. You might also want to give the 'capture' plugin a try. 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. System Monitoring Via Nagios and SNMP - Department of Mathematics Some of the scripts provided with Nagios are restricted to the local server only. (1)Nagios. The processing of active and passive check results is essentially identical. 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. 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. Filters such as firewall and TCP wrappers should be used. The same queue that is used for storing results from active checks is also used to store the results from passive checks. Passive checks are useful for monitoring services that are: Examples of asynchronous services that lend themselves to being monitored passively include SNMP traps and security alerts. See Also: Active Checks, Service Checks, Host Checks. JOB, Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. 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. this is THE MOST comprehensive and straight forward turorial I've seen. This will give an idea on whether the execution will be successful and what the output of the script will look like. Force a check and you will see exactly how the command is being run. VS Code extension | 35 comentarios en LinkedIn Now in your configuration for checks for a host you can create the following service check. The flexibility provided by Nagios is perfect for these case scenarios. 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. 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). In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. It can be used to send results from one Nagios instance to another. NSClient++ includes a service module that can check if a service is running. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Note: A service must be defined in Nagios before you can submit passive check results for it! By using this website, you agree with our Cookies Policy. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. Configure Docker Daemon for Remote Connections - kifarunix.com 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. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. Complete a blank sample electronically to Nagios Tutorial for Beginners - TAE - Tutorial And Example The output indicates that it expires in 300 days. 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. 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. The figure shown below shows a passive check . This command accepts the host name, service description, status code, and the textual output from a check. 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. Nagios's primary mode of "service checking" is called an active check. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. Submitting Passive Check Results From Remote Hosts. - 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]: 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.

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