nagios service check example

(In this example, the script will print All ok and it will exit with 0, the OK . I wrote a plugin in a bash script to check for current Warnings. }. Method 3. Minimum number of days a SSL certiface must be valid. The same queue that is used for storing results from active checks is also used to store the results from passive checks. In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. It has been designed to run . Nagios Core is an Open Source system for monitoring hosts, networks and services. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. For example, if you are bringing down your HTTP server everyday sometime between midnight and 1:59 a.m, you can specify the above "247-except-night-12-2" timeperiod in your service definition for the check_period and notification_period as shown below for your particular service definition. It is called NSCA (Nagios Service Check Acceptor). You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile When Nagios plans and receives results from active checks, it takes the actual network topology into consideration and performs a translation of the states based on this. A major difference between hosts and services is that service checks differentiate between soft and hard states. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). The processing of active and passive check results is essentially identical. NPCA includes a service module that can check if a service is running. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. To figure this out I set nagios into debug mode with the configuration like this. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. When services change state too frequently they are considered to be "flapping". this is THE MOST comprehensive and straight forward turorial I've seen. If you want know more, just read and play with: I'm new to shell and would like to understand and adapt your script would you comment on why this particular adaptation wont work (results unknown - 0 regardless of input parameter sent by the user), countWarnings=$(/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). You never know how many (if any) traps or alerts you'll receive in a given time frame, so it's not feasible to just monitor their status every few minutes. Unlike active checks, Nagios will not take network topology into consideration by default. Even the location of the plugins directory is in there. Using the definition below, checks on the host will be performed after every 3 minutes. 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. Passive checks are also used when configuring distributed or redundant monitoring installations. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. 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. 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. 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. To do this: Navigate to Configuration > Command > New. 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. Otherwise we must rely on parsing the # output from the service management tool. Active checks can be used to "poll" a device or service for status information every so often. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. . Would you please be so kind as to help me? The time performed is specified in seconds. You can create a host file inside the server directory of Nagios and mention the host and service definitions. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! 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. Why is there a voltage on my HDMI and coaxial cables? ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Do not wait for whole document body to download. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Save my name, email, and website in this browser for the next time I comment. This is how your host definitions look currently . When new information regarding a service gets passed to Nagios via the external commands pipe, Nagios treats it the same way as if it had been received by an active check. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. Far better then Nagios documentation. Each server runs one or more common services. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Nagios also offers a tool for sending passive check results for hosts and services over a network. To identify the status of a monitored service, Nagios runs a check plugin on it. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. 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 The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. You have entered an incorrect email address! 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! So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. 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. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. The Nagios server is running on Ubuntu. However, applications on remote hosts can't do this so easily. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. NSClient++ includes a service module that can check if a service is stopped. By default you do not need to change any of the lines in this file and . On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. 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. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. Force a check and you will see exactly how the command is being run. rev2023.3.3.43278. No paper. This example is going to restart the crond service as it is unlikely to cause any issues. By using this website, you agree with our Cookies Policy. 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. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. 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. Securely download your document with other editable templates, any time, with PDFfiller. 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. Service state changes can also trigger on-demand host checks. This can cause problems if you are submitting passive checks from a remote host or you have a distributed monitoring setup where the parent/child host relationships are different. 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. I will use a simple example. 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 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! $ 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. In other cases, passive checks are the way to go. 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. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. 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. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Nagios dependencies.cfg example file. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. In the Select resource macro: section, select USER1. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. This will give an idea on whether the execution will be successful and what the output of the script will look like. 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. I Have problem with the check_http when I try ur command test , I have the next message : document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. 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. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. I just used that simple script as an example, any language can be used to write your own custom plugin. 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. Learn more. These checks can provide useful insight on what is going on within the Nagios server. 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. The following figure shows soft states and hard states. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. 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. To figure this out I set nagios into debug mode with the configuration like this. 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. These types of checks are called Active Checks. The external application writes the results of the check to the. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on host_name Server01 Nagios can be used to monitor Apache web server as well. It is possible to configure Nagios so that it will receive status information sent over a command pipe. Test Server 1: custom application (TCP Port. 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. There would be many cases when the failures will happen randomly and they are temporary; hence Nagios uses states to check the current status of a host or service. Last updated on September 22, 2020 by Sarmed Rahman. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. 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. 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. Nagios.cfg is the main configuration file for your Nagios Core. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. (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".) This task is really easy as Nagios has a built-in command for this. For HTTPS running on a different port, do the following. thank you! (1)Nagios. Hosts and service configurations are the building blocks of Nagios Core. 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. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? hello.. 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). If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. I am gettinr this error in nagios3. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Attributes can be used for both hosts and services. 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. 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. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Another difference is that active checks require much less effort to be set up when compared to passive checks. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, Try to put full path in the command line. To turn on everything you want to set debug_level=4095. >Mainly Focus on Kafka and Cloudera services, Cluster . 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. Nagios check_by_ssh returns status 3 even though running the command manually works? We can also do it at a contact level, by disabling notifications . They have a lot of advantages and some disadvantages. Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. The best answers are voted up and rise to the top, Not the answer you're looking for? mark separates the command from the arguments in the check_command entry. Monitor whether the apache server is available. thanks! Often, there are situations where active checks obviously fit better. How can we prove that the supernatural or paranormal doesn't exist? 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. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? I'd like to use the command line to run that particular check and get the output. 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. 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. They may or may not work on: 44 # your system, as they must be modified for your plugins. 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. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Use Puppet environments. NSClient++ includes a service module that can check if a service is running. The plugins can be in any language, Nagios only cares They can be the following: 0: OK 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. Host is just like a computer; it can be a physical device or virtual. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. It also defines Nagios user and group under which Nagios instance is running. Some methods support checking multiple services at once. So I decided to use the second method. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. In such a case, checks are done by other programs, and their results are sent to Nagios. 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. 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: 5 # provided some comments here, but things may not be so clear without further . Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. 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. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. # SAMPLE HOST CHECK . Asking for help, clarification, or responding to other answers. NRDP has several benefits over NSCA, including: By using this website, you agree with our Cookies Policy. 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. 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. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. In fact, we officially. Nagios: Disable notifications from command line on Windows/Linux. Services that are checked can be in one of four different states: Service checks are performed by plugins, which can return a state of OK, WARNING, UNKNOWN, or CRITICAL. 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.

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