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. I will leave this script with all the other Nagios plugins inside /usr/local/nagios/libexec/ (This directory may be different depending on your confiugration). 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. You can create a host file inside the server directory of Nagios and mention the host and service definitions. The following screenshot shows a complete overview of all the service checks that have been configured so far. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Connect and share knowledge within a single location that is structured and easy to search. NSClient++ includes a service module that can check if a service is running. 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. Passive service checks are often used to report the results of long lasting tests asynchronously. It's pretty simple. 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. As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Let us assume that the following custom application is also running in the network, listening on a particular port. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? check_command check_http -H MYIP -u http://MYIP/test.php This is how your host definitions look currently . 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. It has been designed to run . A good example would be a server that is a part of an application, processing job queues using a database. I wrote a plugin in a bash script to check for current Warnings. 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. Learn more. How can I get it to work with https with Nagios4 and plugins 2.x? External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. # Defaults to 0, put to 1 for systemd. A good example of such a test is checking whether there are bad blocks on a disk. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. In fact, we officially. Force a check and you will see exactly how the command is being run. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. 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. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Each of these options opens the Manage Service Template screen.The New option will have no pre-selected directive values, Copy lets you create a new template based on an existing templates properties, and Modify enables the editing of an . 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. The following settings are done for all MySQL servers. But if the monitoring application is not running or some other issue prevents it from reporting, Nagios can use active checks to keep the service status upto-date. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. This example is going to restart the crond service as it is unlikely to cause any issues. 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. 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. 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. More information on dependencies can be found here. Services are those which are used by Nagios to check something about a host. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation 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. And in Puppet agent, I have to define the environment (Dev, Test or Prod). These types of checks are called Active Checks. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. Method 2. I will use a simple example. In case you don't have the plugin in the Nagios server, you can install it with: So, summarizing, the NRPE will run a script in a remote host, and return the exit code to the Nagios server. can nagios adjust its check time based on the status info? Nagios can be used to monitor Apache web server as well. Nagioshttpdgccgd. 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. This way, the other applications on your Nagios server can report the status of the hosts. >Mainly Focus on Kafka and Cloudera services, Cluster . 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. The module 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 CRITICAL an OK state). It can report each problem when accessing the database. Note: A host must be defined in Nagios before you can submit passive check results for it! Default is 80, This will use HTTPS using default 443 port. You know the basics on Nagios administration. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. vegan) just to try it, does this inconvenience the caterers and staff? 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. TRUST_EXIT_CODE=0 usage () { cat <<EOF November 2012, by Simon Krenger. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active 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. This is a plugin for Nagios wich you can use to check if a linux service is running. 2022 Company, Inc. All rights reserved. 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. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. These plugin states directly translate to service states. i.e: While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. This can be done to gather all critical errors to a single, central place. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! The __HOST__ is a special service name, which represents the host check in Nagios. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). Here is how it can be done. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. We make use of First and third party cookies to improve our user experience. The following line is commented out to make MySQL listens on all interfaces. 2. # Nagios Exit Codes OK=0 WARNING=1 CRITICAL=2 UNKNOWN=3 # Weather or not we can trust the exit code from the service management tool. 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. Scheduled service checks are run in parallel. On-demand service checks are also run in parallel if needed. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Now send a trap and see how the service appears as in Nagios XI. I've: 5 # provided some comments here, but things may not be so clear without further . The following is a sample script that will accept the host name, status code, and output from a check and will submit these to Nagios: As an example of the use of this script, the command that is sent to Nagios for host01, status code 2 (UNREACHABLE) and output router 192.168.1.2 down would be as follows: When submitting results, it is worth noting that Nagios might take some time to process them, depending on the intervals between Nagios checks of the external command pipe. In this way, NSCA communication sent over the Internet is more secure. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. As mentioned earlier, server-2 has postfix mail server set up on it. 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. Set enable_notifications=0 in nagios.cfg. 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). Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. NRDP has several benefits over NSCA, including: I'd like to use the command line to run that particular check and get the output. 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 first parameter tells Nagios that it should check whether the results from the checks are up-to-date. To allow it to grow bigger before rotating, add more zeroes, for example. # 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) . Try to put full path in the command line. 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. }. $ check_http -H 192.168.1.50 HTTP OK HTTP/1.1 200 OK - 332 bytes in 0.004 seconds |time=0.004144s;;;0.000000 size=332B;;;0 2. Architect and design WAP data flow using BigData Platform. 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. . You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Here is an example set of passive checks that . To figure this out I set nagios into debug mode with the configuration like this. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. The documentation uses the example of: for . 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. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. 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 article assumes you have a working knowledge of Nagios. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. Why is there a voltage on my HDMI and coaxial cables? These checks can provide useful insight on what is going on within the Nagios server. 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. $ vi /usr/local/nagios/etc/servers/devserver.cfg Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. If you preorder a special airline meal (e.g. I Have problem with the check_http when I try ur command test , I have the next message : After defining the command you can associate that command to a service, and then to a host. Is there a more efficient way to do this? 1. 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. The Nagios server is running on Ubuntu. In such a case, checks are done by other programs, and their results are sent to Nagios. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. 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. This is very important in situations where a host behind a router is reported to be down because the router is actually down. Related Commands. The check logic inside Nagios process starts the Active check. The flexibility provided by Nagios is perfect for these case scenarios. Copy the configuration file to the Apache directory: /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.conf Install the Nagios Plugins to have a set of tools to monitor your different services: apt install build-essential libssl-dev gcc Check WMI Plus includes a service module that can check if a service is stopped. Nagios also supports a way to monitor hosts and services passively instead of actively. 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. Monitor whether the apache server is available. The provided scripts contain help on the syntax. Nagios Core is an Open Source system for monitoring hosts, networks and services. does the HTML display xx welcome xx? thanks! Fortra's Intermapper vs Kaseya Traverse: which is better? 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. This setting will expose MySQL to all available interfaces, including WAN. This can be done in addition to active checks, to identify critical problems earlier. 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. To identify the status of a monitored service, Nagios runs a check plugin on it. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. I am gettinr this error in nagios3. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. This feature is only available to subscribers. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Default is 10 seconds. However, applications on remote hosts can't do this so easily. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. 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. On-demand as needed for predictive service dependency checks. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. Check whether a document is older than x seconds. This user is then granted all permission to all databases and will be used for monitoring. Default is HTTP/1. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. notifications_enabled 0 Minimum number of days a SSL certiface must be valid. NPCA includes a service module that can check if a service is stopped. 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. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. I test the command from command line successfull, but when I insert in configuration file (cfg) it gives Error: Service check command check_http -H MYIP -u http://MYIP/test.php specified in service HTTP for host Server01 not defined anywhere! Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. First, the servers are defined in Nagios. Nagios also offers a tool for sending passive check results for hosts and services over a network. How can I make Status Information for Nagios services easier to read? 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. Service - Started Check to see if a service is started. 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 order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. Monitoring Website URL Status To subscribe to this RSS feed, copy and paste this URL into your RSS reader. +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. The following file can be modified to do the job. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. 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. For HTTPS running on a different port, do the following. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. 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 says -S is for version. This cant be done as an active check as reading the device takes a lot of time to completelarger disks might require several hours to complete. Some methods support checking multiple services at once. 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. Nagios will ignore all check results for services that had not been configured before it was last (re)started. awesome. # SAMPLE HOST CHECK . You can create a host file inside the server directory of Nagios and mention the host and service definitions. How to Install Nagios? Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. Does anyone have a working example of a dependencies.cfg file for nagios? This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. 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. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots.