It also defines Nagios user and group under which Nagios instance is running. The default FQDN used for testing is www.google.com, but it can be changed as needed. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. The flexibility provided by Nagios is perfect for these case scenarios. . You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile This will give an idea on whether the execution will be successful and what the output of the script will look like. 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. . This command accepts the host name, service description, status code, and the textual output from a check. The files and information on this site are the property of their respective owner(s). The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. . For example, to set up a very similar service, all we need to do is to use the same parameters as those for the hosts: In this case, Nagios will never perform any active checks on its own and will only rely on the results that are passed to it. Note: A service must be defined in Nagios before you can submit passive check results for it! In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. You can check tomcat server, or apache server, or glassfish, or any server that is running on a different port by speficying the port number as shown below. Another difference is that active checks require much less effort to be set up when compared to passive checks. This way, the other applications on your Nagios server can report the status of the hosts. will hold the return value of commands between $( ). These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Now that the syntax is available, TCP port 80 can be checked as follows. For HTTPS running on a different port, do the following. Nagios.cfg is the main configuration file for your Nagios Core. Find the plugin you want to run (if you're not sure, compare what you see in your plugins directory on your Linux box with the plugins located here: http://exchange.nagios.org/directory/Plugins, or try running "./plugin-name -h" to get the help info about the plugin). TRUST_EXIT_CODE=0 usage () { cat <<EOF Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. Repeat this procedure for each Ceph plug-in applicable to the node. This can be done in addition to active checks, to identify critical problems earlier. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. Why is there a voltage on my HDMI and coaxial cables? this is THE MOST comprehensive and straight forward turorial I've seen. nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. It is called NSCA (Nagios Service Check Acceptor). In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. Testing the Commands from Nagios XI Server Now we will test from the Nagios XI server that the command you just added to the NRPE client on the Linux server is working. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. In such cases, only reports regarding hard state changes are propagated across Nagios servers. In Nagios, 2 types of checks are performed on hosts and services . Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. 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. These checks can provide useful insight on what is going on within the Nagios server. Here is how it can be done. To figure this out I set nagios into debug mode with the configuration like this. The host or the services will be tested again and again till the time the status is permanent. Nagios can tell what the status of the service is by reading the exit code of the check. 28. The script should then post results to the Nagios daemon. In the Select resource macro: section, select USER1. Check whether Apache HTTPS is running on a remote server using check_http. The default FQDN used for testing is www.google.com, but it can be changed as needed. . Nagios will ignore all check results for services that had not been configured before it was last (re)started. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. In this tutorial, the following three servers are being used. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. 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. 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. This article assumes you have a working knowledge of Nagios. Architect and design WAP data flow using BigData Platform. This increases the security of the database. Nagios Core is an Open Source system for monitoring hosts, networks and services. In other cases, passive checks are the way to go. By default, Nagios handles results from active and passive checks differently. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. To do this: Navigate to Configuration > Command > New. I Have problem with the check_http when I try ur command test , I have the next message : Is there a proper earth ground point in this switch box? Thanks for contributing an answer to Server Fault! 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. 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. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. How to use it? 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. To check whether a specific webpage is available, use the -u option as shown below. 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. 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. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). >Mainly Focus on Kafka and Cloudera services, Cluster . Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Stop once the headers are downloaded. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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% can anyone help me out for this problem:-, Check-Website-Response Note that all the configuration in this section is done on the client to be checked, not in the nagios server. 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. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation Test Server 1: custom application (TCP Port. It is vital to make sure only legitimate networks have access to the database. Some methods support checking multiple services at once. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. 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. notifications_enabled 0 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. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Even the location of the plugins directory is in there. When services change state too frequently they are considered to be "flapping".
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