NSCA stands for Nagios Service Check Acceptor. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. This can be done in addition to active checks, to identify critical problems earlier. This way, the other applications on your Nagios server can report the status of the hosts. Nagios dependencies.cfg example file. Even the location of the plugins directory is in there. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. Sometimes I find it tricky figuring out exactly what a plugin is doing. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. Nagios can tell what the status of the service is by reading the exit code of the check. The check_init_service plugin does not support checking multiple services. 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. The same queue that is used for storing results from active checks is also used to store the results from passive checks. However, applications on remote hosts can't do this so easily. This allows for seamless integration of status information from external applications with Nagios. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. I am gettinr this error in nagios3. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. This user is then granted all permission to all databases and will be used for monitoring. It is vital to make sure only legitimate networks have access to the database. More information on the flap detection logic can be found here. 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. This is a plugin for Nagios wich you can use to check if a linux service is running. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. 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. Manual tuning is needed to tell MySQL to listen on other interfaces as well. 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 external application writes the results of the check to the. The following screenshot shows a complete overview of all the service checks that have been configured so far. Nagios also offers another way to work with the statuses of hosts and services. Hi, this is a fantastic article, i managed to learn how to make plugins myself. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. Define the checks on /etc/nagios/nrpe_local.cfg. VS Code extension | 35 comentarios en LinkedIn The following is a script that runs the dd system command (visit http://man.linuxquestions.org/index.php?query=dd) to read an entire block device. Expected response string. The check logic inside Nagios process starts the Active check. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Last updated on September 22, 2020 by Sarmed Rahman. 5 check_http Command Examples 1. Learn more. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Go to the Nagios interface via a web browser and log in as the nagiosadmin user. check_http -H hostname (or) -I ip-address {optional options}. 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% Check HTTP Check whether Apache HTTP is running on a remote server using check_http. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. 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. It is possible to configure Nagios so that it will receive status information sent over a command pipe. # 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. 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. 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 . 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 Core is an Open Source system for monitoring hosts, networks and services. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Fortra's Intermapper vs Kaseya Traverse: which is better? Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. . Nagios allows applications and event handlers to send out passive check results for host objects. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Passive service checks are often used to report the results of long lasting tests asynchronously. On-demand as needed for predictive service dependency checks. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. (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".) Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. Is it possible to check a web page through an authenticated proxy server? 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. Hi, thanks for your comment. use generic-service ; Name of service template to use Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. Passive checks are performed by external processes and the results are given back to Nagios for processing. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. Select check_cluster from the plugin pop-up menu. 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. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. What is check_http? To check whether a specific webpage is available, use the -u option as shown below. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, More information on cached checks can be found here. 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. For example: 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. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. Start the Nagios again. does the HTML display xx welcome xx? 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. Default is 80, This will use HTTPS using default 443 port. Making statements based on opinion; back them up with references or personal experience. can nagios adjust its check time based on the status info? Unlike active checks, Nagios will not take network topology into consideration by default. Would you please be so kind as to help me? Active checks can be used to "poll" a device or service for status information every so often. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). More information on dependencies can be found here. 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. Submitting Passive Check Results From Remote Hosts. These checks help ensure that the dependency logic is as accurate as possible. In an earlier post, I showed how to . 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. 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. By default, Nagios handles results from active and passive checks differently. 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. The sections below provide examples of how to perform these checks using different methods. Minimum number of days a SSL certiface must be valid. This increases the security of the database. The object file localhost.cfg allows for parameters to be passed to check_ssh. 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. Force a check and you will see exactly how the command is being run. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Kaydolmak ve ilere teklif vermek cretsizdir. Using the definition below, checks on the host will be performed after every 3 minutes. The files and information on this site are the property of their respective owner(s). (In this example, the script will print All ok and it will exit with 0, the OK . check_http: command not found. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. 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. Passive checks are also used when configuring distributed or redundant monitoring installations. It will give you all the available options: See the HTML : 45 The Nagios server is running on Ubuntu. How to handle a hobby that makes income in US. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. I've: 5 # provided some comments here, but things may not be so clear without further . 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. 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. 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. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Agree check_command check_http -H MYIP -u http://MYIP/test.php Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation 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. 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. This setting will expose MySQL to all available interfaces, including WAN. 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). Another difference is that active checks require much less effort to be set up when compared to passive 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. Up To: Contents rev2023.3.3.43278. /usr/nagios/libexec/check_http .. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile An external application checks the status on hosts/services and writes the result to External Command File. Service state changes can also trigger on-demand host checks. 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. To use a custom script as a plugin to run remotely through NRPE, you should first write the script on the server, for instance in /usr/local/scripts/check_root_home_du.sh: The previous script is a very simple example, checking the disk usage of the directory /root and setting a threshold for considering it OK, Warning or Critical. For Nagios, many, many Oracle plugins are available for checking database availability and performance. The plugins can be in any language, Nagios only cares They can be the following: 0: OK Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. The following figure shows soft states and hard states. The example contains partial output. You have entered an incorrect email address! This feature is only available to subscribers. 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. Nonetheless, they can be tuned to match the requirements. NPCA includes a service module that can check if a service is running. The output indicates that it expires in 300 days. Nagios's primary mode of "service checking" is called an active check. Previous parts of this book often mentioned Nagios performing checks on various software and machines. The processing of active and passive check results is essentially identical. In such a case, checks are done by other programs, and their results are sent to Nagios. A good example would be a server that is a part of an application, processing job queues using a database. mark separates the command from the arguments in the check_command entry. . Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. In the following example, we are checking whether the website certificate expires in the next 365 days. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. . 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. Related Commands. 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. 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. 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. In other cases, passive checks are the way to go. Nagios comes with a wide range of built-in scripts for monitoring services. Get your subscription here. A major difference between hosts and services is that service checks differentiate between soft and hard states. The host or the services will be tested again and again till the time the status is permanent. 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. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. Nagios provides a sample configuration file, that we will use. you have the flexibility of sending the passive check to Nagios with a different hostname. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. It only takes a minute to sign up. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. See Also: Active Checks, Service Checks, Host Checks. How to Install Nagios? It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. The __HOST__ is a special service name, which represents the host check in Nagios. Nagios will ignore all check results for services that had not been configured before it was last (re)started. The documentation uses the example of: for . 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. 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. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Test Server 1: custom application (TCP Port. Why is there a voltage on my HDMI and coaxial cables? Services are those which are used by Nagios to check something about a host. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. The line should look like: Define the standard checks that you will perform on every client with NRPE. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. 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. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. 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 is because, very often, passive checks are used to report host and service statuses from other Nagios instances. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Note: A host must be defined in Nagios before you can submit passive check results for it! # SAMPLE HOST CHECK . We can also do it at a contact level, by disabling notifications . 2. Method 3. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". Current status from nagios Web interface: Thank you article really help a beginer like me ;-). i.e: 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. 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). To do this: Navigate to Configuration > Command > New. You need to add the full path to it in the check_command. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. 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. This is very important in situations where a host behind a router is reported to be down because the router is actually down. There are several different use cases covered in this KB article: The sections below provide examples of how to perform these checks using different methods. The flexibility provided by Nagios is perfect for these case scenarios. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. The following file can be modified to do the job. Note: A service must be defined in Nagios before you can submit passive check results for it! The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This command accepts the host name, service description, status code, and the textual output from a check. Server Fault is a question and answer site for system and network administrators. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. This plugin uses systemctl is-active command, please check you have systemd. Here is an example set of passive checks that . This can be done to gather all critical errors to a single, central place. More information on how this works can be found here. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. 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. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. can anyone help me out for this problem:-, Check-Website-Response Always remember, prior to reloading Nagios, check that there are no errors in the configuration. How can I get it to work with https with Nagios4 and plugins 2.x? 13. 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, In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. NSClient++ includes a service module that can check if a service is stopped. To allow it to grow bigger before rotating, add more zeroes, for example. Depending on the status received on hosts and services, appropriate action is taken. Nagios can be used to monitor Apache web server as well. 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). 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.

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