nagios service check example

In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. VS Code extension | 35 comentarios en LinkedIn Check WMI Plus includes a service module that can check if a service is stopped. 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 nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. . These checks can provide useful insight on what is going on within the Nagios server. 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. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. Another difference is that active checks require much less effort to be set up when compared to passive checks. The following line is commented out to make MySQL listens on all interfaces. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. This setting will expose MySQL to all available interfaces, including WAN. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. 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. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. The script should then post results to the Nagios daemon. 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. 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. Note: A service must be defined in Nagios before you can submit passive check results for it! The following file can be modified to do the job. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Establish a terminal session to your Nagios XI server and execute the following command: What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. It has been designed to run . Here is an example set of passive checks that . In the first case, Nagios takes care of the scheduling, and the command only needs to perform the actual checks and mark the results as OK/WARNING/CRITICAL based on how a check command is configured. 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. 03-16-2010, 10:31 AM . Service state changes can also trigger on-demand host checks. Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again. 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}. 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. Up To: Contents Nagios can be used to monitor Apache web server as well. Often, there are situations where active checks obviously fit better. Often, you have situations where other applications can report if a certain service is working properly or not. They are a web interface and command line tool set to work with Nagios config that have decent default templates and "example" files that you can leverage for common checks. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. 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. It's pretty simple. Minimum number of days a SSL certiface must be valid. UNKNOWN 2013-04-25 18:11:24 0d 0h 55m 37s 4/4 RESPONSE: UNKNOWN ERROR: /usr/bin/nc does does not exist, i am really getting frustrate from this nagios error, nitin: you need to install the netcat package for your distribution which will provide /usr/bin/nc, I had been using this plugin for a while. The application can also periodically let Nagios know if it succeeded in using the database without problems. . Note that there are possible security implications of this change, so it's worth mentioning a few words: The following tuning should do the trick. 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. Hosts and service configurations are the building blocks of Nagios Core. See Also: Active Checks, Service Checks, Host Checks. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. A good example would be a server that is a part of an application, processing job queues using a database. 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. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. In such a case, checks are done by other programs, and their results are sent to Nagios. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. 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. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. You need to add the full path to it in the check_command. The basic workings of service checks are described here Services are checked by the Nagios daemon: On-demand checks are performed as part of the predictive service dependency check logic. To check whether a specific webpage is available, use the -u option as shown below. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. Add additional tags that should be sent in the HTTP header. Check whether a document is older than x seconds. 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. Passive Checks and NSCA (Nagios Service Check Acceptor), Technology news, insights and tutorials from Packt, Top 6 Cybersecurity Books from Packt to Accelerate Your Career, Your Quick Introduction to Extended Events in Analysis Services from Blog, Logging the history of my past SQL Saturday presentations from Blog, Storage savings with Table Compression from Blog Posts SQLServerCentral, Daily Coping 31 Dec 2020 from Blog Posts SQLServerCentral, Learning Essential Linux Commands for Navigating the Shell Effectively, Exploring the Strategy Behavioral Design Pattern in Node.js, How to integrate a Medium editor in Angular 8, Implementing memory management with Golangs garbage collector, How to create sales analysis app in Qlik Sense using DAR, http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114, ExploringForms in Angular types, benefits and differences. Nagios provides a sample configuration file, that we will use. . A good example might be running a check that takes several hours to completein this case, it does not make sense to raise the global service_check_timeout option, but rather to schedule these checks outside of Nagios and only report the results back to it. Follow these steps to install the plugin: Download the plugin. This setting is done on all MySQL servers. Method 2. Last updated on September 22, 2020 by Sarmed Rahman. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Services are those which are used by Nagios to check something about a host. Nagioshttpdgccgd. hello.. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Related Commands. Is there a more efficient way to do this? 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. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Test Server 1: custom application (TCP Port. To turn on everything you want to set debug_level=4095. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . 28. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. Set enable_notifications=0 in nagios.cfg. >Mainly Focus on Kafka and Cloudera services, Cluster . Submitting Passive Check Results From Remote Hosts. mark separates the command from the arguments in the check_command entry. 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 such cases, only reports regarding hard state changes are propagated across Nagios servers. To identify the status of a monitored service, Nagios runs a check plugin on it. Nagios also offers a way of combining the benefits of both active and passive checks. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. 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. It can be used to send results from one Nagios instance to another. 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. The sections below provide examples of how to perform these checks using different methods. We make use of First and third party cookies to improve our user experience. Save my name, email, and website in this browser for the next time I comment. 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. Can I tell police to wait and call a lawyer when served with a search warrant? For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. To do this: Navigate to Configuration > Command > New. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. 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. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. 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. 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. use generic-service ; Name of service template to use These are executed on regular intervals, as defined by check_interval and retry_interval. It is vital to make sure only legitimate networks have access to the database. And in Puppet agent, I have to define the environment (Dev, Test or Prod). # Defaults to 0, put to 1 for systemd. By default, Nagios handles results from active and passive checks differently.

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