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. Giving material.angular.io a refresh from Angular Blog Medium. I've: 5 # provided some comments here, but things may not be so clear without further . Syntax and Options 5 check_http Command Examples 1. Now that the syntax is available, TCP port 80 can be checked as follows. Nagios can tell what the status of the service is by reading the exit code of the check. 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). How to use check_cluster to monitor service availability of multiple Service Checks - Nagios Support This plugin uses systemctl is-active command, please check you have systemd. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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. Nonetheless, they can be tuned to match the requirements. Connect and share knowledge within a single location that is structured and easy to search. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Now in your configuration for checks for a host you can create the following service check. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Is there a more efficient way to do this? Current status from nagios Web interface: Thank you article really help a beginer like me ;-). Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. How To Write Nagios Plugin - Bash Script - github.com So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! 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). (In this example, the script will print All ok and it will exit with 0, the OK . 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. Active checks can be used to "poll" a device or service for status information every so often. Minimum number of days a SSL certiface must be valid. More information on dependencies can be found here. (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".) 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. Try to put full path in the command line. 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. The check logic inside Nagios process starts the Active check. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. These checks are useful when you cannot monitor hosts/services on a regular basis. In other cases, passive checks are the way to go. Related Commands. 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. Thanks for contributing an answer to Server Fault! Often, you have situations where other applications can report if a certain service is working properly or not. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. 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. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. 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. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Check whether Apache HTTP is running on a remote server using check_http. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. 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. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. Passive Checks - 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. 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. That is superb artile I was looking for! This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? In this tutorial, the following three servers are being used. The script should then post results to the Nagios daemon. 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. [SOLVED] Nagios dependencies.cfg example file However, if there are no jobs to process and the application is not using it, Nagios will not have up-to-date information about the database. The Nagios server is running on Ubuntu. 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. You have entered an incorrect email address! Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. It is vital to make sure only legitimate networks have access to the database. A major difference between hosts and services is that service checks differentiate between soft and hard states. How to Define Nagios Timeperiod Exclude for Maintenance Window Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. Configuring a Nagios Monitoring System | Scaleway Documentation Checking NRPE Status In Linux: A Guide To Troubleshooting Issues With 13. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: 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! How can I manually run a nagios check from the command line? The service check runs in a child process that was fork()ed from the main Nagios daemon. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. 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. 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. Check whether a document is older than x seconds. Passive checks require all the logic related to what should be reported and when it should be checked to be put in an external application. Manual tuning is needed to tell MySQL to listen on other interfaces as well. Consider the following script (check_warnings.sh): Based on the information provided by the nagiostats tool, I assume everything is ok if there are five or less services in Warning state.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-medrectangle-4','ezslot_1',108,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-medrectangle-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-medrectangle-4','ezslot_2',108,'0','1'])};__ez_fad_position('div-gpt-ad-howtoforge_com-medrectangle-4-0_1');.medrectangle-4-multi-108{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. It only takes a minute to sign up. Passive checks are also used when configuring distributed or redundant monitoring installations. 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. To figure this out I set nagios into debug mode with the configuration like this. can nagios adjust its check time based on the status info? - 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]: If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. # Plugin commands (service and host check commands) # Arguments are likely to change between different . check_command check_http -H MYIP -u http://MYIP/test.php The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. The external application writes the results of the check to the. Fortra's Intermapper vs Kaseya Traverse: which is better? (1)Nagios. Previous parts of this book often mentioned Nagios performing checks on various software and machines. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. 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. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. The figure shown below shows an active check . 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. Monitor DNS server with Nagios you have the flexibility of sending the passive check to Nagios with a different hostname. Force a check and you will see exactly how the command is being run. Agree You might also want to give the 'capture' plugin a try. # Defaults to 0, put to 1 for systemd. The object file localhost.cfg allows for parameters to be passed to check_ssh. System Monitoring Via Nagios and SNMP - Department of Mathematics Nagios understands the following exit codes: Save my name, email, and website in this browser for the next time I comment. checkcommands.cfg in branches/locker-dev/noc/nagios - scripts.mit.edu 03-16-2010, 10:31 AM . How to handle a hobby that makes income in US. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. For example, you can use the 'check_http' plugin to verify that a web server is running, is returning the right text, or has an up-to-date SSL certificate. Nagios also offers a tool for sending passive check results for hosts and services over a network. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. So I decided to use the second method. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. The time performed is specified in seconds. mark separates the command from the arguments in the check_command entry. The provided scripts contain help on the syntax. Use Hiera. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. Repeat this procedure for each Ceph plug-in applicable to the node. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. An external application checks the status of a host or service. . Complete a blank sample electronically to 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 More information on cached checks can be found here. 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% Stop once the headers are downloaded. You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. The -S option is not working with 2.0 plugins. To allow it to grow bigger before rotating, add more zeroes, for example. Force a check and you will see exactly how the command is being run. nagios-check-website - Nagios Exchange
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