(1)Nagios. 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. Are there tables of wastage rates for different fruit and veg? The line should look like: Define the standard checks that you will perform on every client with NRPE. Passive checks are also used when configuring distributed or redundant monitoring installations. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Use Hiera. The first thing that needs to be done in order to use passive checks for your Nagios setup is to make sure that you have the following options in your main Nagios configuration file: It would also be good to enable the logging of incoming passive checksthis makes determining the problem of not processing a passive check much easier. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. For HTTPS running on a different port, do the following. As mentioned earlier, server-2 has postfix mail server set up on it. 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. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. This command accepts the host name, status code, and the textual output from a check. Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". The following file can be modified to do the job. 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. }. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. Nagios understands the following exit codes: 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. These checks help ensure that the dependency logic is as accurate as possible. Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. 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. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Often, you have situations where other applications can report if a certain service is working properly or not. i.e: 1. 5 check_http examples For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. NSClient++ includes a service module that can check if a service is running. # Plugin commands (service and host check commands) # Arguments are likely to change between different . These are executed on regular intervals, as defined by check_interval and retry_interval. How to install and configure nagios on centos 7 step by step ile ilikili ileri arayn ya da 22 milyondan fazla i ieriiyle dnyann en byk serbest alma pazarnda ie alm yapn. # SAMPLE HOST CHECK . This can be done to gather all critical errors to a single, central place. Follow these steps to install the plugin: Download the plugin. Another example is where an application already processes information such as network bandwidth utilization. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. >Mainly Focus on Kafka and Cloudera services, Cluster . Also, MySQL would not let just any host to connect to it. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. Expected response string. The plugin 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 "stopped" have an OK state). Learn more about Stack Overflow the company, and our products. NSCA stands for Nagios Service Check Acceptor. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile The files and information on this site are the property of their respective owner(s). It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. Attributes can be used for both hosts and services. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! To allow it to grow bigger before rotating, add more zeroes, for example. This user is then granted all permission to all databases and will be used for monitoring. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Nagios can tell what the status of the service is by reading the exit code of the check. The processing of active and passive check results is essentially identical. Far better then Nagios documentation. 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 :). To do this: Navigate to Configuration > Command > New. 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. Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. The plugin returns a CRITICAL state if the service is not started. The external application writes the results of the check to the. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. In many cases, the time taken is not enough, as some checks need to be performed over a longer period of time to have satisfactory results. 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. host_name Server01 What is check_http? Check WMI Plus includes a service module that can check if a service is stopped. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. First you should define a command in the commands.cfg file. They have a lot of advantages and some disadvantages. I wrote a plugin in a bash script to check for current Warnings. 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. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. In this tutorial, the following three servers are being used. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. Submitting Passive Check Results From Remote Hosts. Passive service checks are often used to report the results of long lasting tests asynchronously. It can report each problem when accessing the database. # 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. In this way, NSCA communication sent over the Internet is more secure. Another difference is that active checks require much less effort to be set up when compared to passive checks. thanks! Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. The plugin returns a CRITICAL state if the service is not started. Nagios server in this example is hosted on 192.168..150 and an example client is hosted on IP 192.168..200 Exit Codes To identify the status of a monitored service, Nagios runs a check nagios.cfg. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. just because i had already looked in the commands.cfg file to figure out which commands were running, but i wanted to know what flags were being set. In order to be able to submit passive check results, we need to configure Nagios to allow the sending of passive check results, and set the host objects to accept them. 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. Agree Agree Nagios: Simple Oracle Check. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. Architect and design WAP data flow using BigData Platform. I just used that simple script as an example, any language can be used to write your own custom plugin. Monitor whether the apache server is available. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Complete a blank sample electronically to Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. How can I make Status Information for Nagios services easier to read? 13. The sections below provide examples of how to perform these checks using different methods. NSClient++ includes a service module that can check if a service is running. Now let us add check_interval directive. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. And in Puppet agent, I have to define the environment (Dev, Test or Prod). How to handle a hobby that makes income in US. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. 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. 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. Asking for help, clarification, or responding to other answers. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Nagios also offers another way to work with the statuses of hosts and services. 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 HTTP is running on a remote server using check_http. 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. 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. Service state changes can also trigger on-demand host checks. These types of checks are called Active Checks. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! Would you please be so kind as to help me? Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. The check_init_service plugin does not support checking multiple services. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. Note: A service must be defined in Nagios before you can submit passive check results for it! 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. thank you! Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. We make use of First and third party cookies to improve our user experience. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. NRDP has several benefits over NSCA, including: By default you do not need to change any of the lines in this file and . More information on how this works can be found here. Services are those which are used by Nagios to check something about a host. Using the definition below, checks on the host will be performed after every 3 minutes. November 2012, by Simon Krenger. 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. Here is how it can be done. Nagios also offers a tool for sending passive check results for hosts and services over a network. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. Now in your configuration for checks for a host you can create the following service check. Connect and share knowledge within a single location that is structured and easy to search. Nagios's primary mode of "service checking" is called an active check. It's pretty simple. Hi, thanks for your comment. Default is HTTP/1. Select check_cluster from the plugin pop-up menu. It is called NSCA (Nagios Service Check Acceptor). More information on the flap detection logic can be found here. For example . On the next screen: Enter a unique name in the Command Name field (suggest one is check_host_cluster and the other check_service_cluster) Append --host to the Command Line section for host . Learn more. This example is going to restart the crond service as it is unlikely to cause any issues. Nagios also supports a way to monitor hosts and services passively instead of actively. hello.. The host or the services will be tested again and again till the time the status is permanent.
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