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If an application that resides on the same host as Nagios is sending passive host or service check results, it can simply write the results directly to the external command file as outlined above. Nagios understands the following exit codes: Another example is where an application already processes information such as network bandwidth utilization. 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. sudo usermod -aG docker kifarunix. On-demand service checks are also run in parallel if needed. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Or you can create a custom variable to store the port number , with your example: The application can also periodically let Nagios know if it succeeded in using the database without problems. 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. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. It says Unknown option specified in config file , check_http -I 10.0.0.76 -p 8192 url=/MYServiceBus/ post= eregi=.Status_Code.0./Status_Code. 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. More information on dependencies can be found here. # SAMPLE HOST CHECK . Nagios will be configured to monitor SMTP and mail queue of the server. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Active checks can be used to "poll" a device or service for status information every so often. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. define service{ 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. I wrote a plugin in a bash script to check for current Warnings. We can also configure Nagios so that if no new information has been provided within a certain period of time, it will use active checks to get the current status of the host or service. Method 2. Up To: Contents This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. 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. They may or may not work on: 44 # your system, as they must be modified for your plugins. It can be used to send results from one Nagios instance to another. 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. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. 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. As mentioned earlier, Nagios can forgo the actual execution of an on-demand service check if it can use the cached results from a relatively recent service check. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. More information on the flap detection logic can be found here. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Just cd (or not) into the plugins directory (this directory location varies, depending on how you've installed it, but check /usr/local/nagios, or /usr/lib/nagios). I Have problem with the check_http when I try ur command test , I have the next message : You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. The following line is commented out to make MySQL listens on all interfaces. Apply these agent configurations After the NRDP installation, install the NCPA. 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. 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 about Stack Overflow the company, and our products. First, the servers are defined in Nagios. Nagios also offers a way of combining the benefits of both active and passive checks. 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. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Fortra's Intermapper vs Kaseya Traverse: which is better? To keep the article focused on service monitoring, we will not be configuring hostgroups or templates, as they have been covered in the previous tutorial. - 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]: Monitoring Website URL Status The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . 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. Monitor whether the apache server is available. 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. There are also different types of checks including external applications or devices that want to report information directly to Nagios. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. In fact, we officially. See the HTML : 45 First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). In order to use them, the host needs to be configured to accept passive checks results. We can also do it at a contact level, by disabling notifications . . The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. thanks! Now send a trap and see how the service appears as in Nagios XI. Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. These are executed on regular intervals, as defined by check_interval and retry_interval. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. Active checks are most common in the Nagios world. To learn more, see our tips on writing great answers. 2022 Company, Inc. All rights reserved. Force a check and you will see exactly how the command is being run. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. Attributes can be used for both hosts and services. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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. We make use of First and third party cookies to improve our user experience. Nagios can tell what the status of the service is by reading the exit code of the check. command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. 03-16-2010, 10:31 AM . 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. This is very important in situations where a host behind a router is reported to be down because the router is actually down. By default Nagios supports URL monitoring and there is an command check_http, however if you want to monitor URL like SSL certification you can also do by extending the command options. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. 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. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". The processing of active and passive check results is essentially identical. check_command check_http -H MYIP -u http://MYIP/test.php 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 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. Making statements based on opinion; back them up with references or personal experience. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. 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. Check whether Apache HTTPS is running on a remote server using check_http. I'd like to use the command line to run that particular check and get the output. First, install the Nagios Core server. 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 :). While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. 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. The time performed is specified in seconds. The documentation uses the example of: for . If you want Nagios to treat all passive check results for hosts as if they were soft results, you need to enable the following option in the main Nagios configuration file: Passive service checks are very similar to passive host checks. Affordable solution to train a team and make them project ready. 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. 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). (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. And in Puppet agent, I have to define the environment (Dev, Test or Prod). An external application checks the status of a host or service. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. When Nagios plans and receives results from active checks, it takes the actual network topology into consideration and performs a translation of the states based on this. Some of the scripts provided with Nagios are restricted to the local server only. Securely download your document with other editable templates, any time, with PDFfiller. Nagios also offers a tool for sending passive check results for hosts and services over a network. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. This will give an idea on whether the execution will be successful and what the output of the script will look like. Up To: Contents 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. Define the checks on /etc/nagios/nrpe_local.cfg. 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. How can I make Status Information for Nagios services easier to read? To use a custom script as a plugin to run remotely through NRPE, you should first write the script on the server, for instance in /usr/local/scripts/check_root_home_du.sh: The previous script is a very simple example, checking the disk usage of the directory /root and setting a threshold for considering it OK, Warning or Critical. Yeah, it's totally brute-force, but
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nagios service check example