28. The default FQDN used for testing is www.google.com, but it can be changed as needed. Check WMI Plus 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. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. check_http: command not found. The service check runs in a child process that was fork()ed from the main Nagios daemon. You can check tomcat server, or apache server, or glassfish, or any server that is running on a different port by speficying the port number as shown below. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Is there a proper earth ground point in this switch box? Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Having managed large Nagios installations for many years, assigning services to hostgroups is an anti pattern and can make things complicated fast if your environment gets big. In order to use them, the host needs to be configured to accept passive checks results. To allow it to grow bigger before rotating, add more zeroes, for example. 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. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). Chapter 5. Configuring the Nagios Plugins for Ceph 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 figure shown below shows a passive check . The plugin can only check if the service is started, you could however use the negate plugin to invert the returned result from the plugin (hence making "stopped" have an OK state). 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. Monitoring Log Messages with Nagios Passive Checks | ls -A In the following example, we are checking whether the website certificate expires in the next 365 days. How to use check_cluster to monitor service availability of multiple . The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). The following diagram shows how both active and passive checks are performed by Nagios. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Services are those which are used by Nagios to check something about a host. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. 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. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Examen Nagios - Volume: 94 Questions + 7Labs Question: 1 Escalations The same queue that is used for storing results from active checks is also used to store the results from passive checks. It can report each problem when accessing the database. 2. Nagios check_by_ssh returns status 3 even though running the command manually works? Nagios will ignore all check results for services that had not been configured before it was last (re)started. Nagios Turn Off All Notifications | 6 Methods Revealed An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. The following directive allows it: Setting up hosts or services for passive checking requires an object to be defined and set up so as not to perform active checks. 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. does the HTML display xx welcome xx? # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. The flexibility provided by Nagios is perfect for these case scenarios. Force a check and you will see exactly how the command is being run. 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. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. Nagios: Simple Oracle Check - Simon Krenger How to tell which packages are held back due to phased updates. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. The sections below provide examples of how to perform these checks using different methods. I will use a simple example. 5 check_http examples (1)Nagios. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. can anyone help me out for this problem:-, Check-Website-Response 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. See Also: Active Checks, Service Checks, Host Checks. We want Nagios to monitor this database, and as the application is already using it, we can add a module that reports this to Nagios. Architect and design WAP data flow using BigData Platform. great! Using the definition below, checks on the host will be performed after every 3 minutes. Learn more about Stack Overflow the company, and our products. will hold the return value of commands between $( ). This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. 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. Server Fault is a question and answer site for system and network administrators. NSClient++ includes a service module that can check if a service is running. Nagios check_dns / check_ip Example - Nagios Exchange 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. Method 3. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. These plugin states directly translate to service states. You have entered an incorrect email address! Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. Nagios SNMP checks - The Noc Cave Submitting Passive Host Check Results External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. Nagios vs Zabbix - What's the Difference ? (Pros and Cons) In this way, NSCA communication sent over the Internet is more secure. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. Linux Check Service - Nagios Exchange When services change state too frequently they are considered to be "flapping". This setting is done on all MySQL servers. This article assumes you have a working knowledge of Nagios. To learn more, see our tips on writing great answers. 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. Monitor DNS server with Nagios Passive checks are also used when configuring distributed or redundant monitoring installations. This plugin uses systemctl is-active command, please check you have systemd. Nagioshttpdgccgd. 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! 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. Now that the syntax is available, TCP port 80 can be checked as follows. 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 following is a script that runs the dd system command (visit http://man.linuxquestions.org/index.php?query=dd) to read an entire block device. Thank you for any assistance you can provide. Does anyone have a working example of a dependencies.cfg file for nagios? Nagios XI - SNMP Trap Tutorial - Nagios Support Check WMI Plus includes a service module that can check if a service is running. TRUST_EXIT_CODE=0 usage () { cat <<EOF nagios-plugins/check_service.sh at master - GitHub Nagios executes event handlers to handle hard states. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. The application can also periodically let Nagios know if it succeeded in using the database without problems. 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. First, the servers are defined in Nagios. Nagios comes with a wide range of built-in scripts for monitoring services. Each server runs one or more common services. nagiosrpm. 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). thank you! You might also want to give the 'capture' plugin a try. Or you can create a custom variable to store the port number , with your example: 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. Thanks for contributing an answer to Server Fault! The line should look like: Define the standard checks that you will perform on every client with NRPE. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. The -S option is not working with 2.0 plugins. 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. 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. 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. 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 :). 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. # These are some example service check commands. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. 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 For HTTPS running on a different port, do the following. I've: 5 # provided some comments here, but things may not be so clear without further . The plugins can be in any language, Nagios only cares They can be the following: 0: OK NSCA stands for Nagios Service Check Acceptor. nagios-check-website - Nagios Exchange It is vital to make sure only legitimate networks have access to the database. host_name Server01 You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. 03-16-2010, 10:31 AM . My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? In such a case, checks are done by other programs, and their results are sent to Nagios. More information on dependencies can be found here. Nagios also offers another way to work with the statuses of hosts and services. 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. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! checkcommands.cfg in noc/nagios - scripts.mit.edu This command accepts the host name, status code, and the textual output from a check. # Defaults to 0, put to 1 for systemd. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. Nagios Core is an Open Source system for monitoring hosts, networks and services. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. this is more along the lines of what i meant. 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 example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file For example: Nagios: How to determine parameter order check_ssh @sunardo I just ran into this exact same thing. You can create a host file inside the server directory of Nagios and mention the host and service definitions. How to install and configure Nagios Core. 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. Learn more. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Now let us add check_interval directive. thanks! To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. 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. Let us see an example to perform checks on host . See the HTML : 45 Stop once the headers are downloaded. 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. This can be done to gather all critical errors to a single, central place. Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat Use Hiera. This example is going to restart the crond service as it is unlikely to cause any issues. Yeah, it's totally brute-force, but it works for me. Connect and share knowledge within a single location that is structured and easy to search. 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. There are also different types of checks including external applications or devices that want to report information directly to Nagios. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Nagios also offers a tool for sending passive check results for hosts and services over a network. Nagios can be used to monitor Apache web server as well. 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. Often, you have situations where other applications can report if a certain service is working properly or not. 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. 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. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by.
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