nagios service check example
By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. hello.. Submitting Passive Check Results From Remote Hosts. Getting Started NCPA - Nagios 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. The results are passed to Nagios in the same way as they are passed for hosts. 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. Nagios check_dns / check_ip Example - Nagios Exchange Use this Nagios monitoring tutorial for proactive IT monitoring Service state changes can also trigger on-demand host checks. It is vital to make sure only legitimate networks have access to the database. Default is 80, This will use HTTPS using default 443 port. Making statements based on opinion; back them up with references or personal experience. In Nagios, 2 types of checks are performed on hosts and services . Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. can nagios adjust its check time based on the status info? 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 with Nagios ADMIN Magazine The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Is there a proper earth ground point in this switch box? 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. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. TRUST_EXIT_CODE=0 usage () { cat <<EOF The host or the services will be tested again and again till the time the status is permanent. Can I tell police to wait and call a lawyer when served with a search warrant? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Service Checks - Nagios The above definitions add a host called ubuntu_host and defines the services which will run on this host. Manula's Blog: Monitoring a HTTPS URL with Nagios To identify the status of a monitored service, Nagios runs a check plugin on it. Architect and design WAP data flow using BigData Platform. The provided scripts contain help on the syntax. Scheduled service checks are run in parallel. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. These plugin states directly translate to service states. Learn more. sudo usermod -aG docker kifarunix. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file http://www.waggy.at/nagios/capture_plugin.htm, Go to your plugin directory - in my example it is, Type you plugin name - in my example it is, now run the full command - (plugin name) -H (hostname) -p (port number), However in this example port number is optional, in your config file which is look something like below (myserver.cfg) and you want to run check_cpu from command line, to check instantly (without GUI green or red), Try this - (plugin full path) - H (servername) -c (checkname). Nagios will be configured to monitor SMTP and mail queue of the server. The method for using any of these "plugins" from the command line is the same as any other Linux script: Just run "./plugin-name" with the appropriate flags you want to check, and voila! Current status from nagios Web interface: Thank you article really help a beginer like me ;-). 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 . The service check runs in a child process that was fork()ed from the main Nagios daemon. Unlike active checks, Nagios will not take network topology into consideration by default. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. The -S option is not working with 2.0 plugins. The documentation uses the example of: for . VS Code extension | 35 comentarios en LinkedIn Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Passive Checks and NSCA (Nagios Service Check Acceptor) Hosts and service configurations are the building blocks of Nagios Core. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. NPCA includes a service module that can check if a service is stopped. I've: 5 # provided some comments here, but things may not be so clear without further . Check whether a document is older than x seconds. (In this example, the script will print All ok and it will exit with 0, the OK . By default you do not need to change any of the lines in this file and . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. # 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. Fortra's Intermapper vs Kaseya Traverse vs Nagios XI comparison 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. Host is just like a computer; it can be a physical device or virtual. With a little tweaking, Nagios can help monitor this application port as well. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. will hold the return value of commands between $( ). 2. And in Puppet agent, I have to define the environment (Dev, Test or Prod). $ 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. 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. After installing nagios and nagios-plugins-all (via yum), I've c. It can be used to send results from one Nagios instance to another. The Nagios Service Check Acceptor (NSCA ) addon has historically been the addon of choice for Nagios administrators that need to establish data feeds or passive check transmission between Nagios installations. You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. The files and information on this site are the property of their respective owner(s). Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. A good example would be a server that is a part of an application, processing job queues using a database. 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. # SAMPLE HOST CHECK . By using this website, you agree with our Cookies Policy. checkcommands.cfg in branches/locker-dev/noc/nagios - scripts.mit.edu 13. 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. Monitor whether the apache server is available. A user nagios is created for both localhost and for any host. Nagios check_http Plugin - Nagios Plugins 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). This yields less output to dig through. We can also do it at a contact level, by disabling notifications . Passive Checks - Nagios If I used the first method, I have to keep separate site.pp for each environment. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. Configure Docker Daemon for Remote Connections - kifarunix.com 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. 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 :). Nagios's primary mode of "service checking" is called an active check. 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. 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. NPCA includes a service module that can check if a service is running. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, 1 check_http -p 8083 - user4556274 Jul 29, 2016 at 12:49 Add a comment 3 Answers Sorted by: 3 You can specify the port number directly in the command but you will must create one command per tested port. Nagios executes event handlers to handle hard states. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. It only takes a minute to sign up. For example: This usually calls for some effort. Does a summoned creature play immediately after being summoned by a ready action? can anyone help me out for this problem:-, Check-Website-Response Nagios allows applications and event handlers to send out passive check results for host objects. (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".) Nagios Turn Off All Notifications | 6 Methods Revealed Test Server 1: custom application (TCP Port. How to Monitor PostgreSQL using Nagios | Severalnines Hi, thanks for your comment. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that Submitting Passive Host Check Results External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. In other cases, passive checks are the way to go. 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. Syntax and Options The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: define host { use generic-host host_name linuxbox01 address 10.0.2.1 In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. vegan) just to try it, does this inconvenience the caterers and staff? Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Nagios also offers another way to work with the statuses of hosts and services. Puppet nagios check disk example - United States Tutorials Step-by-step 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. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. For HTTPS running on a different port, do the following. To do this: Navigate to Configuration > Command > New. 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. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. Service Checks - Nagios Support It will give you all the available options: Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. 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 plugin on it. Here is my configuration : debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Let us see an example to perform checks on host . Tanuj Bansal - Data Analyst - Kafka Service Owner and Cloudera 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. November 2012, by Simon Krenger. Nagioshttpdgccgd. Cached checks will only provide a performance increase if you are making use of service dependencies. 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. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. 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. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. No software installation. How to tell which packages are held back due to phased updates. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. How To Write Nagios Plugin - Bash Script - github.com I Have problem with the check_http when I try ur command test , I have the next message : The example contains partial output. NRDP has several benefits over NSCA, including: The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. JOB, I take a slightly more brute-force direction than @Zoredache, I login to the nagios server and do "while true; do ps awwlx | grep NAGIOS_CHECK_NAME; done", while I force a re-check of the service, where NAGIOS_CHECK_NAME is either part of the check name or the IP of the server I am looking for. It also defines Nagios user and group under which Nagios instance is running. Nagios - Hosts and Services - tutorialspoint.com thanks! Use Hiera. 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. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. Agree Minimum number of days a SSL certiface must be valid. Format is minimum:maximum, Response time in seconds for warning state, Response time in seconds for critical state, Number of seconds to wait before connection times out. Check WMI Plus includes a service module that can check if a service is running. 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. Yeah, it's totally brute-force, but
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