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Service - Started Check to see if a service is started. Complete a blank sample electronically to I am running into the same problem as David The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. 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. Minimum number of days a SSL certiface must be valid. Can I tell police to wait and call a lawyer when served with a search warrant? The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. In the Select resource macro: section, select USER1. 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. 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. Check whether Apache HTTP is running on a remote server using check_http. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. 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. Nonetheless, they can be tuned to match the requirements. It can report each problem when accessing the database. 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 Attributes can be used for both hosts and services. Previous parts of this book often mentioned Nagios performing checks on various software and machines. 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. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. We make use of First and third party cookies to improve our user experience. In order to use them, the host needs to be configured to accept passive checks results. Remember to allow the execution of the script: if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-4','ezslot_6',110,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-4-0'); The result is a text message and an exit code: This step will be the same with your own plugins, and if you download a third-party plugin from the internet as well. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. 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. define service{ use generic-service host_name web1.onemetric.com.au service_description Uptime check_command snmp_Uptime!-C public } Adjust the commands as required. 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 __HOST__ is a special service name, which represents the host check in Nagios. This yields less output to dig through. Nagios will be configured to monitor SMTP and mail queue of the server. More information on the flap detection logic can be found here. These types of checks are called Active Checks. A major difference between hosts and services is that service checks differentiate between soft and hard states. 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. The script should then post results to the Nagios daemon. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that An external application checks the status of a host or service. use generic-service ; Name of service template to use Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat 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. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. can anyone help me out for this problem:-, Check-Website-Response These checks help ensure that the dependency logic is as accurate as possible. 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. The default FQDN used for testing is www.google.com, but it can be changed as needed. This can be done to gather all critical errors to a single, central place. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. First, install the Nagios Core server. This way, the other applications on your Nagios server can report the status of the hosts. To learn more, see our tips on writing great answers. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Once the host and services are configured on Nagios, checks are used to see if the hosts and services are working as they are supposed to or not. 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. 03-16-2010, 10:31 AM . How to handle a hobby that makes income in US. 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. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. You might also want to give the 'capture' plugin a try. This command accepts the host name, status code, and the textual output from a check. Use Puppet environments. vegan) just to try it, does this inconvenience the caterers and staff? Thank you for any assistance you can provide. The plugins can be in any language, Nagios only cares They can be the following: 0: OK Define the checks on /etc/nagios/nrpe_local.cfg. $ 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. 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. Learn more. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Let us assume that the following custom application is also running in the network, listening on a particular port. Nagioshttpdgccgd. 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. does the HTML display xx welcome xx? You do this with nagios -v command as root: Ensure it returns 0 errors and 0 warnings and proceed to reload the service: After reloading the service, you will see the associated check in the localhost. In case you don't have the plugin in the Nagios server, you can install it with: So, summarizing, the NRPE will run a script in a remote host, and return the exit code to the Nagios server. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Nagios check_http Plugin - Nagios Plugins 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. Nagios can tell what the status of the service is by reading the exit code of the check. Nagios: monitor http service on a different port - Server Fault The same queue that is used for storing results from active checks is also used to store the results from passive checks. On a finishing note, Nagios can monitor many other sectors of a network. # Plugin commands (service and host check commands) # Arguments are likely to change between different . Making statements based on opinion; back them up with references or personal experience. Up To: Contents 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. The above definitions add a host called ubuntu_host and defines the services which will run on this host. 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 host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. nagiosrpm. Establish a terminal session to your Nagios XI server and execute the following command: 5 Nagios check_http Plugin Examples for HTTP / HTTPS The figure shown below shows a passive check . The following screenshot shows a complete overview of all the service checks that have been configured so far. Submitting Passive Check Results From Remote Hosts. 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. System Monitoring Via Nagios and SNMP< SNMP snmp is an internet protocol that allows you to retrieve management information from a remote device or to set configuration settings on a remote device. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. Nagios also offers a tool for sending passive check results for hosts and services over a network. Examen Nagios - Volume: 94 Questions + 7Labs Question: 1 Escalations Nagios provides a sample configuration file, that we will use. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. The provided scripts contain help on the syntax. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. 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. NSCA stands for Nagios Service Check Acceptor. JOB, This example is going to restart the crond service as it is unlikely to cause any issues. It has been designed to run . Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. Does anyone have a working example of a dependencies.cfg file for nagios? 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. System Monitoring Via Nagios and SNMP - Department of Mathematics You can create a host file inside the server directory of Nagios and mention the host and service definitions. Nagios also offers a way of combining the benefits of both active and passive checks. In this way, NSCA communication sent over the Internet is more secure. check_http -H hostname (or) -I ip-address {optional options}. This setting is done on all MySQL servers. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". It is possible to configure Nagios so that it will receive status information sent over a command pipe. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. 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). The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. 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. This is a plugin for Nagios wich you can use to check if a linux service is running. Nagios understands the following exit codes: All other servicemarks and trademarks are the property of their respective owner. 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. No software installation. Nagios server in this example is hosted on 192.168..150 and an example client is hosted on IP 192.168..200 Exit Codes To identify the status of a monitored service, Nagios runs a check plugin on it. 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). Active checks are most common in the Nagios world. 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. Are there tables of wastage rates for different fruit and veg? So the Nagios Core version is 3.5.1. Service Checks - Nagios Support Nagios SNMP checks - The Noc Cave The documentation uses the example of: for . No paper. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Monitor whether the apache server is available. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. The check_init_service plugin does not support checking multiple services. 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. 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. 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. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Nagios configuration - How to configure Nagios - GeekPeek.Net Do not wait for whole document body to download. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. 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. Getting Started NCPA - Nagios A user [emailprotected] is created in MySQL server. (In this example, the script will print All ok and it will exit with 0, the OK . ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. Agree Manual tuning is needed to tell MySQL to listen on other interfaces as well. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. To figure this out I set nagios into debug mode with the configuration like this. Linux Check Service - Nagios Exchange http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. The external application writes the results of the check to the. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, 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. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. How Nagios process handles passive check results can be defined in the main Nagios configuration file. Chapter 5. Configuring the Nagios Plugins for Ceph It is called NSCA (Nagios Service Check Acceptor). By default you do not need to change any of the lines in this file and . 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. 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. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. . While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. 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. Nagios: How to determine parameter order check_ssh Nagios check_by_ssh returns status 3 even though running the command manually works? It is a protocol that is used in reverse of the other common Nagios protocol NRPE. Nagios executes event handlers to handle hard states. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. Checking NRPE Status In Linux: A Guide To Troubleshooting Issues With In order to make Nagios treat passive host check results in the same way as active check results, we need to enable the following option: By default, Nagios treats host results from passive checks as hard results. (1)Nagios. In fact, we officially. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. This is the main configuration file of Nagios core. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. This allows for seamless integration of status information from external applications with Nagios. Some of the scripts provided with Nagios are restricted to the local server only. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Monitoring Windows hosts with NSClient++: Service and system checks For Nagios, many, many Oracle plugins are available for checking database availability and performance. Fortra's Intermapper vs Kaseya Traverse: which is better? Install And Configure Nagios On Linux - LogicWeb You need to add the full path to it in the check_command. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. Test Server 1: custom application (TCP Port. These checks are useful when you cannot monitor hosts/services on a regular basis. Monitor DNS server with Nagios Use this Nagios monitoring tutorial for proactive IT monitoring 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).