In order to use them, the host needs to be configured to accept passive checks results. On any device & OS. Nagios comes with a wide range of built-in scripts for monitoring services. I am running into the same problem as David It will give you all the available options: I've: 5 # provided some comments here, but things may not be so clear without further . 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). It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. It has been designed to run . $ vi /usr/local/nagios/etc/servers/devserver.cfg Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The plugin returns a CRITICAL state if the service is not started. 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. Active checks are most common in the Nagios world. 2022 Company, Inc. All rights reserved. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Check whether Apache HTTP is running on a remote server using check_http. Often, there are situations where active checks obviously fit better. This command accepts the host name, service description, status code, and the textual output from a check. 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. can anyone help me out for this problem:-, Check-Website-Response It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on A user nagios is created for both localhost and for any host. They have a lot of advantages and some disadvantages. define service{ 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 default FQDN used for testing is www.google.com, but it can be changed as needed. 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. Up To: Contents 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. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. By default, Nagios handles results from active and passive checks differently. This is a plugin for Nagios wich you can use to check if a linux service is running. can nagios adjust its check time based on the status info? The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. How Nagios process handles passive check results can be defined in the main Nagios configuration file. 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. 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). For this reason, the only way to perform such a check is to schedule them from the systemfor example, using the cron daemon (visit http://man.linuxquestions.org/index.php?query=cron). 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. thank you! If I used the first method, I have to keep separate site.pp for each environment. Active checks can be used to "poll" a device or service for status information every so often. As the Nagios toolsets, including NSCA (Nagios Service Check Acceptor for submitting passive check results to the Nagios core server) and NRPE (Nagios Remote Plugin Executor for accepting active check requests from the Nagios core server and send back the results), were initially only developed for Unix-based and Linux Operating Systems, Complete a blank sample electronically to Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. 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. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Nagios also offers another way to work with the statuses of hosts and services. Also, MySQL would not let just any host to connect to it. The results are passed to Nagios in the same way as they are passed for hosts. 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. 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 :). Go to the /usr/local/nagios/libexec dir (assuming you have installed nagios from source, if you have used a package from your distribution, check the docs of your package): $ cd /usr/local/nagios/libexec execute the check_dns plugin with the --help switch. I just used that simple script as an example, any language can be used to write your own custom plugin. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. Unlike active checks, Nagios will not take network topology into consideration by default. 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. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. The files and information on this site are the property of their respective owner(s). It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Here is an example set of passive checks that . Nagios also supports a way to monitor hosts and services passively instead of actively. 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. 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. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Do not wait for whole document body to download. Here is how it can be done. Learn more. NPCA includes a service module that can check if a service is stopped. It also defines Nagios user and group under which Nagios instance is running. More information on the NSCA addon can be found here. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. You can create a host file inside the server directory of Nagios and mention the host and service definitions. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Try to put full path in the command line. When it is an active check result, Nagios takes the fact that switch1 is down into account and maps the child nodes result into an UNREACHABLE state. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Can i specify what a valid response is, i.e. 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. There are also different types of checks including external applications or devices that want to report information directly to Nagios. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . Add the command to the NRPE configuration file on the client (/etc/nagios/nrpe_local.cfg): Now we can access the server and test it like any standard plugin. 13. Learn more. Submitting Passive Check Results From Remote Hosts. On-demand as needed for predictive service dependency checks. The example contains partial output. Force a check and you will see exactly how the command is being run. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. 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 checks help ensure that the dependency logic is as accurate as possible. i'm very new on that kind of progamming what does this line ", " means i really want to lear some but i need help please helpme. These plugin states directly translate to service states. It's pretty simple. This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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. (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".) Nagios also offers a way of combining the benefits of both active and passive checks. 5 check_http Command Examples 1. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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. The -S option is not working with 2.0 plugins. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. Would you please be so kind as to help me? 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 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. 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. How can I manually run a nagios check from the command line? 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. Attributes can be used for both hosts and services. It only takes a minute to sign up. . Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. The best answers are voted up and rise to the top, Not the answer you're looking for? Far better then Nagios documentation. # These are some example service check commands. It says -S is for version. # Plugin commands (service and host check commands) # Arguments are likely to change between different . 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. You know the basics on Nagios administration. host_name Server01 . Nagios: Disable notifications from command line on Windows/Linux. 2. For example: A major difference between hosts and services is that service checks differentiate between soft and hard states. You have entered an incorrect email address! Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. It is possible to configure Nagios so that it will receive status information sent over a command pipe. 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. This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario.