nagios service check example

The following screenshot shows a complete overview of all the service checks that have been configured so far. (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".) To check whether a specific webpage is available, use the -u option as shown below. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. You know the basics on Nagios administration. These types of checks are called Passive Checks. The __HOST__ is a special service name, which represents the host check in Nagios. They may or may not work on: 44 # your system, as they must be modified for your plugins. This command accepts the host name, status code, and the textual output from a check. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. That is superb artile I was looking for! A major difference between hosts and services is that service checks differentiate between soft and hard states. Nagios will ignore all check results for services that had not been configured before it was last (re)started. To figure this out I set nagios into debug mode with the configuration like this. Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Check whether Apache HTTPS is running on a remote server using check_http. Making statements based on opinion; back them up with references or personal experience. Submitting Passive Check Results From Remote Hosts. The above definitions add a host called ubuntu_host and defines the services which will run on this host. The results are passed to Nagios in the same way as they are passed for hosts. In such a case, checks are done by other programs, and their results are sent to Nagios. (1)Nagios. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? The plugin returns a CRITICAL state if the service is not started. The check_init_service plugin does not support checking multiple services. Nagios dependencies.cfg example file. Related Commands. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. . It is vital to make sure only legitimate networks have access to the database. If you want Nagios to treat all passive check results for hosts as if they were soft results, you need to enable the following option in the main Nagios configuration file: Passive service checks are very similar to passive host checks. There are also different types of checks including external applications or devices that want to report information directly to Nagios. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. NPCA includes a service module that can check if a service is running. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. 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. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Select check_cluster from the plugin pop-up menu. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Note: A service must be defined in Nagios before you can submit passive check results for it! Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. does the HTML display xx welcome xx? Is there a more efficient way to do this? The flexibility provided by Nagios is perfect for these case scenarios. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. This is how your host definitions look currently . 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! Learn more. # Plugin commands (service and host check commands) # Arguments are likely to change between different . However, two hours after the last passive or active check result was received, Nagios would perform an active check to keep the results up-to-date. 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. 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. The output indicates that it expires in 300 days. Default is 10 seconds. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. NPCA includes a service module that can check if a service is stopped. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. More information on cached checks can be found here. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Force a check and you will see exactly how the command is being run. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. These checks help ensure that the dependency logic is as accurate as possible. It has been designed to run . command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. The host or the services will be tested again and again till the time the status is permanent. Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. I'd like to use the command line to run that particular check and get the output. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nagioshttpdgccgd. By default Nagios supports URL monitoring and there is an command check_http, however if you want to monitor URL like SSL certification you can also do by extending the command options. You might also want to give the 'capture' plugin a try. Each server runs one or more common services. They are a web interface and command line tool set to work with Nagios config that have decent default templates and "example" files that you can leverage for common checks. For Nagios, many, many Oracle plugins are available for checking database availability and performance. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. mark separates the command from the arguments in the check_command entry. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. The following line is commented out to make MySQL listens on all interfaces. $ 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. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. This can be done in addition to active checks, to identify critical problems earlier. See the HTML : 45 Now send a trap and see how the service appears as in Nagios XI. Passive checks are also used when configuring distributed or redundant monitoring installations. When it is an active check result, Nagios takes the fact that switch1 is down into account and maps the child nodes result into an UNREACHABLE state. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. 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! Passive service checks are often used to report the results of long lasting tests asynchronously. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. 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). . Nagios: Disable notifications from command line on Windows/Linux. 13. Scheduled service checks are run in parallel. Thanks for contributing an answer to Server Fault! Nagios provides a sample configuration file, that we will use. How to Install Nagios? /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: Active checks are initiated by Nagios process and then run on a regular scheduled basis. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Define the checks on /etc/nagios/nrpe_local.cfg. On-demand checks are performed as part of the predictive service dependency check logic. These are executed on regular intervals, as defined by check_interval and retry_interval. 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. can anyone help me out for this problem:-, Check-Website-Response Nagios understands the following exit codes: When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. Server Fault is a question and answer site for system and network administrators. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). How can I make Status Information for Nagios services easier to read? 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. Host is just like a computer; it can be a physical device or virtual. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. 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% 2022 Company, Inc. All rights reserved. To learn more, see our tips on writing great answers. 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. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Let us assume that the following custom application is also running in the network, listening on a particular port. Kaydolmak ve ilere teklif vermek cretsizdir. 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. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. JOB, Try to put full path in the command line. The following figure shows soft states and hard states. In order to use them, the host needs to be configured to accept passive checks results. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. Now in your configuration for checks for a host you can create the following service check. Manual tuning is needed to tell MySQL to listen on other interfaces as well. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. 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. All other servicemarks and trademarks are the property of their respective owner. An external application checks the status on hosts/services and writes the result to External Command File. thank you! 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. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. 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. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Establish a terminal session to your Nagios XI server and execute the following command: 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. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Nagios can check whether the server is online by running ping on the IP/name of the server as well as it can be set up to provide warnings in case the round trip time (RTT) to the server increases. 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. $ vi /usr/local/nagios/etc/servers/devserver.cfg For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. I've provided some comments here, but things may not be so # clear without further explanation. This can cause problems if you are submitting passive checks from a remote host or you have a distributed monitoring setup where the parent/child host relationships are different. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. 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. The service check runs in a child process that was fork()ed from the main Nagios daemon. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. 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. Get your subscription here. 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. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. nagiosrpm. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. How can we prove that the supernatural or paranormal doesn't exist? check_command check_http -H MYIP -u http://MYIP/test.php Nagios Core is an Open Source system for monitoring hosts, networks and services. After installing nagios and nagios-plugins-all (via yum), I've c. 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 is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. 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. Note: A host must be defined in Nagios before you can submit passive check results for it! When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. When Nagios needs to run a scheduled service check, it will initiate the service check and then return to doing other work (running host checks, etc). System Monitoring Via Nagios and SNMP< SNMP snmp is an internet protocol that allows you to retrieve management information from a remote device or to set configuration settings on a remote device. Add additional tags that should be sent in the HTTP header. This increases the security of the database. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. host_name Server01 If I used the first method, I have to keep separate site.pp for each environment. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Detecting and dealing with state changes is what Nagios is all about. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Nagios allows applications and event handlers to send out passive check results for host objects. Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. When Nagios checks the status of services, it will be able to detect when a service changes between OK, WARNING, UNKNOWN, and CRITICAL states and take appropriate action. 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. How can I get it to work with https with Nagios4 and plugins 2.x? . This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. Filters such as firewall and TCP wrappers should be used. By using this website, you agree with our Cookies Policy. Services are those which are used by Nagios to check something about a host. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. To allow it to grow bigger before rotating, add more zeroes, for example. Minimum number of days a SSL certiface must be valid. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. This is a plugin for Nagios wich you can use to check if a linux service is running. 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. 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! It can report each problem when accessing the database. I am gettinr this error in nagios3. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. rev2023.3.3.43278. Check WMI Plus includes a service module that can check if a service is running. Attributes can be used for both hosts and services. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. When services change state too frequently they are considered to be "flapping". Is it possible to check a web page through an authenticated proxy server? Active checks can be used to "poll" a device or service for status information every so often. Method 2. A sample definition for a host that runs an active check if there has been no result provided within the last two hours: The following is an illustration showing when Nagios would invoke active checks: Each time there is at least one passive check result that is still valid (i.e., was received within the past two hours), Nagios will not perform any active checks. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. The plugins can be in any language, Nagios only cares They can be the following: 0: OK The files and information on this site are the property of their respective owner(s). How can I manually run a nagios check from the command line? As the Nagios toolsets, including NSCA (Nagios Service Check Acceptor for submitting passive check results to the Nagios core server) and NRPE (Nagios Remote Plugin Executor for accepting active check requests from the Nagios core server and send back the results), were initially only developed for Unix-based and Linux Operating Systems, Nagios's primary mode of "service checking" is called an active check. VS Code extension | 35 comentarios en LinkedIn Agree service_description check http://MYIP/test.php This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. this is THE MOST comprehensive and straight forward turorial I've seen. Let us see an example to perform checks on host . hello.. A user [emailprotected] is created in MySQL server. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. 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 setting is done on all MySQL servers. No paper. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Nagios will be configured to monitor SMTP and mail queue of the server. Nonetheless, they can be tuned to match the requirements. 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. However, applications on remote hosts can't do this so easily. Otherwise we must rely on parsing the # output from the service management tool. I wrote a plugin in a bash script to check for current Warnings. 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). To identify the status of a monitored service, Nagios runs a check plugin on it. Complete a blank sample electronically to See Also: Active Checks, Service Checks, Host Checks. Also, depending on your configuration you should add this last file to the main file (/usr/local/nagios/etc/nagios.cfg): Check the configuration and, if no errors or warnings, reload the service: And now you have a new custom check on a host: Nagios has a huge library of plugins available at Nagios Exchange. 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. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. As this tutorial is based on Debian 9, I will show as an example how to install it, but you can find instructions for any distribution. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. 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. The processing of active and passive check results is essentially identical. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Active checks are most common in the Nagios world.

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