The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? 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. Kaydolmak ve ilere teklif vermek cretsizdir. 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). Stop once the headers are downloaded. check_http: command not found. nagiosrpm. The following file can be modified to do the job. 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. So I decided to use the second method. Define the checks on /etc/nagios/nrpe_local.cfg. Affordable solution to train a team and make them project ready. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. Up To: Contents Attributes can be used for both hosts and services. Remember that the $USER1$ variable, is a local Nagios variable set in the resource.cfg file, in my case pointing to /usr/local/nagios/libexec. This way, the other applications on your Nagios server can report the status of the hosts. This setting will expose MySQL to all available interfaces, including WAN. 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. rev2023.3.3.43278. The line should look like: Define the standard checks that you will perform on every client with NRPE. How Nagios process handles passive check results can be defined in the main Nagios configuration file. (1)Nagios. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. By using this website, you agree with our Cookies Policy. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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. 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. There are no attachments for this article. 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. Minimum number of days a SSL certiface must be valid. How to handle a hobby that makes income in US. There are also different types of checks including external applications or devices that want to report information directly to Nagios. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. Or you can create a custom variable to store the port number , with your example: 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. Let us see an example to perform checks on host . You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. 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. 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. Now let us add check_interval directive. 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. The figure shown below shows an active check . It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. NPCA includes a service module that can check if a service is running. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? 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. The application can also periodically let Nagios know if it succeeded in using the database without problems. Nagios also offers a way of combining the benefits of both active and passive checks. 1. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Start the Nagios again. 2022 Company, Inc. All rights reserved. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. The default FQDN used for testing is www.google.com, but it can be changed as needed. By default, Nagios handles results from active and passive checks differently. Method 2. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Check whether a document is older than x seconds. service_description check http://MYIP/test.php Note: A host must be defined in Nagios before you can submit passive check results for it! When services change state too frequently they are considered to be "flapping". It is called NSCA (Nagios Service Check Acceptor). 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. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. 2. (If I were running df -h on the linux CLI, I'm using the "h" flag - in the case of the df command, the h stands for "human readable".) The example contains partial output. How to use it? Nagios Core and Nagios XI has a features to monitoring website URL status. 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. 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. Learn more about Stack Overflow the company, and our products. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. 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. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. In this way, NSCA communication sent over the Internet is more secure. Do not wait for whole document body to download. The module defines a "good" service as one that is running and a "bad" service is one that is not running, so you can define critical is when more than 0 "good" services exist. I am running into the same problem as David The files and information on this site are the property of their respective owner(s). 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. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? This command accepts the host name, status code, and the textual output from a check. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. 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. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. Hosts and service configurations are the building blocks of Nagios Core. Add additional tags that should be sent in the HTTP header. This is a plugin for Nagios wich you can use to check if a linux service is running. These checks are scripts and progams which take input (for example, which host to check, tresholds), do a check and then return an exit code and some performance data. 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. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. To do this: Navigate to Configuration > Command > New. 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. if one of my checked systems goes down, and therefore fails a PING check, I do NOT need to be notified that a file system is unavailable, or that SSH is down, too. Connect and share knowledge within a single location that is structured and easy to search. The same queue that is used for storing results from active checks is also used to store the results from passive checks. Here is my configuration : The results are passed to Nagios in the same way as they are passed for hosts. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. 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. As mentioned earlier, server-2 has postfix mail server set up on it. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. The check_init_service plugin does not support checking multiple services. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. 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. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Host is just like a computer; it can be a physical device or virtual. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. I'd like to use the command line to run that particular check and get the output. Expected response string. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. thank you! Apply these agent configurations After the NRDP installation, install the NCPA. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. In fact, we officially. 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 :). Check whether Apache HTTP is running on a remote server using check_http. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. To learn more, see our tips on writing great answers. 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. Note: A service must be defined in Nagios before you can submit passive check results for it! Repeat this procedure for each Ceph plug-in applicable to the node. I don't know if it's best practice or not , but i would declare count Warnings as an integer variable when doing arithmetic operations. Architect and design WAP data flow using BigData Platform. Depending on the status received on hosts and services, appropriate action is taken. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. If you would like to disable passive checks for just a few hosts or services, use the passive_checks_enabled directive in the host and/or service definitions to do so. awesome. Services are those which are used by Nagios to check something about a host. thanks! define service{ use generic-service host_name web1.onemetric.com.au service_description Uptime check_command snmp_Uptime!-C public } Adjust the commands as required. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. Can i specify what a valid response is, i.e. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. 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. Establish a terminal session to your Nagios XI server and execute the following command: Does a summoned creature play immediately after being summoned by a ready action? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It has been designed to run . These types of checks are called Passive Checks. Thanks for contributing an answer to Server Fault! # SAMPLE HOST CHECK . First you should define a command in the commands.cfg file. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. 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. Nagios can be used to monitor Apache web server as well. Agree It shows what is performed by Nagios in both cases and what needs to be done by the check command or an external application for passive checks. NSClient++ includes a service module that can check if a service is running. This is the main configuration file of Nagios core. does the HTML display xx welcome xx? Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. 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. 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. /usr/nagios/libexec/check_http .. 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. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. check_command check_http -H MYIP -u http://MYIP/test.php Syntax and Options 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 will use a simple example. 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. A user [emailprotected] is created in MySQL server. The flexibility provided by Nagios is perfect for these case scenarios. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. The -S option is not working with 2.0 plugins. Affordable solution to train a team and make them project ready. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. The __HOST__ is a special service name, which represents the host check in Nagios. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. >Mainly Focus on Kafka and Cloudera services, Cluster . This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. For HTTPS running on a different port, do the following. Passive checks are also used when configuring distributed or redundant monitoring installations. Making statements based on opinion; back them up with references or personal experience. Now that the syntax is available, TCP port 80 can be checked as follows. sudo usermod -aG docker kifarunix. Force a check and you will see exactly how the command is being run. See the HTML : 45 An external application checks the status of a host or service. How can we prove that the supernatural or paranormal doesn't exist? will hold the return value of commands between $( ). 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. +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. It's pretty simple. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. 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. Services are those which are used by Nagios to check something about a host. Nagios comes with a wide range of built-in scripts for monitoring services. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I wrote a plugin in a bash script to check for current Warnings. 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. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. It only takes a minute to sign up. On a finishing note, Nagios can monitor many other sectors of a network. . In such a case, checks are done by other programs, and their results are sent to Nagios. The best answers are voted up and rise to the top, Not the answer you're looking for? This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. More information on dependencies can be found here. It also defines Nagios user and group under which Nagios instance is running. Service state changes can also trigger on-demand host checks. Each server runs one or more common services. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. More information on the flap detection logic can be found here. To identify the status of a monitored service, Nagios runs a check plugin on it. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. How to tell which packages are held back due to phased updates. NSClient++ includes a service module that can check if a service is stopped. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. The object file localhost.cfg allows for parameters to be passed to check_ssh. Submitting Passive Check Results From Remote Hosts. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. Nonetheless, they can be tuned to match the requirements. 5 check_http Command Examples 1. 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.
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