Let us see an example to perform checks on host Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. 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. How to handle a hobby that makes income in US. See the HTML : 45 Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Furthermore , Nagios can also check whether TCP port 80 (web server) is reachable e.g., the server is online but Apache/IIS is not responding. 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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. 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. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. 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. # Defaults to 0, put to 1 for systemd. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. Thanks for contributing an answer to Server Fault! It can be used to send results from one Nagios instance to another. 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. Some of the scripts provided with Nagios are restricted to the local server only. 6 Nagios Command Line Options Explained with Examples - The Geek Stuff Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. Otherwise we must rely on parsing the # output from the service management tool. 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. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. 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. The application can also periodically let Nagios know if it succeeded in using the database without problems. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Does a summoned creature play immediately after being summoned by a ready action? # SAMPLE HOST CHECK . To allow it to grow bigger before rotating, add more zeroes, for example. They may or may not work on: 44 # your system, as they must be modified for your plugins. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. does the HTML display xx welcome xx? (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".) One of the problems is that such checks can take only a couple of seconds to completea typical timeout for an active check to complete is 10 or 30 seconds. The sections below provide examples of how to perform these checks using different methods. 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. Hi, thanks for your comment. The following line is commented out to make MySQL listens on all interfaces. 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. 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. Detecting and dealing with state changes is what Nagios is all about. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. The same queue that is used for storing results from active checks is also used to store the results from passive checks. Nagios check_dns / check_ip Example - Nagios Exchange You can create a host file inside the server directory of Nagios and mention the host and service definitions. Service Checks - Nagios My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? vegan) just to try it, does this inconvenience the caterers and staff? In other cases, passive checks are the way to go. Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. A user [emailprotected] is created in MySQL server. Nagios can be used to monitor Apache web server as well. This way, the other applications on your Nagios server can report the status of the hosts. check_command check_http -H MYIP -u http://MYIP/test.php All other servicemarks and trademarks are the property of their respective owner. The results are passed to Nagios in the same way as they are passed for hosts. In order to use them, the host needs to be configured to accept passive checks results. . How to monitor common services with Nagios - Xmodulo debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. 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. 2022 Company, Inc. All rights reserved. Submitting Passive Check Results From Remote Hosts. 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. 1 check_http -p 8083 - user4556274 Jul 29, 2016 at 12:49 Add a comment 3 Answers Sorted by: 3 You can specify the port number directly in the command but you will must create one command per tested port. Passive checks are useful for monitoring services that are: Examples of asynchronous services that lend themselves to being monitored passively include SNMP traps and security alerts. 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}. 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. To learn more, see our tips on writing great answers. Check WMI Plus includes a service module that can check if a service is stopped. 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). 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. Establish a terminal session to your Nagios XI server and execute the following command: In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. 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. Use Puppet environments. In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. Check whether Apache HTTPS is running on a remote server using check_http. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. These plugin states directly translate to service states. The external application writes the results of the check to the. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. 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. The line should look like: Define the standard checks that you will perform on every client with NRPE. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. The documentation uses the example of: for . 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. It says -S is for version. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file Passive Checks - Nagios Here is how it can be done. When services change state too frequently they are considered to be "flapping". This setting will expose MySQL to all available interfaces, including WAN. Up To: Contents Services are those which are used by Nagios to check something about a host. They have a lot of advantages and some disadvantages. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. hello.. 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). First, install the Nagios Core server. The figure shown below shows a passive check . Are there tables of wastage rates for different fruit and veg? 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. NSClient++ includes a service module that can check if a service is running. It is possible to configure Nagios so that it will receive status information sent over a command pipe. For example . Define the checks on /etc/nagios/nrpe_local.cfg. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. By using this website, you agree with our Cookies Policy. 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 the Select resource macro: section, select USER1. It will give you all the available options: External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Far better then Nagios documentation. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. rev2023.3.3.43278. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that Far better then Nagios documentation. 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 HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Here is an example set of passive checks that . To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. The following diagram shows how both active and passive checks are performed by Nagios. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Nagios check_by_ssh returns status 3 even though running the command manually works? Force a check and you will see exactly how the command is being run. To figure this out I set nagios into debug mode with the configuration like this. Often, there are situations where active checks obviously fit better. This can be done in addition to active checks, to identify critical problems earlier.
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