With a little tweaking, Nagios can help monitor this application port as well. Method 3. 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. Unlike active checks, Nagios will not take network topology into consideration by default. The example contains partial output. i.e: This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. Up To: Contents Nagios will be configured to monitor SMTP and mail queue of the server. All other servicemarks and trademarks are the property of their respective owner. One of the problems is that such checks can take only a couple of seconds to completea typical timeout for an active check to complete is 10 or 30 seconds. Far better then Nagios documentation. host_name Server01 Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Use Hiera. . Even if its parent host is currently DOWN, the child host state is also stored as DOWN. The object file localhost.cfg allows for parameters to be passed to check_ssh. However, applications on remote hosts can't do this so easily. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. To do this: Navigate to Configuration > Command > New. Method 2. thank you! On any device & OS. This increases the security of the database. It can report each problem when accessing the database. Often, you have situations where other applications can report if a certain service is working properly or not. 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. See Also: Active Checks, Service Checks, Host Checks. 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. First, the servers are defined in Nagios. 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. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. . While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. This is how your host definitions look currently . This setting will expose MySQL to all available interfaces, including WAN. Some methods support checking multiple services at once. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. Nagioshttpdgccgd. 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 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. 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). Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. Is there a proper earth ground point in this switch box? This can be done to gather all critical errors to a single, central place. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? It is a protocol that is used in reverse of the other common Nagios protocol NRPE. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. This task is really easy as Nagios has a built-in command for this. 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. An external application checks the status on hosts/services and writes the result to External Command File. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. 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 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. In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. A user nagios is created for both localhost and for any host. check_command check_http -H MYIP -u http://MYIP/test.php By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. This is the main configuration file of Nagios core. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Would you please be so kind as to help me? Hosts and service configurations are the building blocks of Nagios Core. Try to put full path in the command line. Here is how it can be done. Learn more. If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. Passive service checks are often used to report the results of long lasting tests asynchronously. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. vegan) just to try it, does this inconvenience the caterers and staff? 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, Default is 10 seconds. But today when I am trying to post an XML message to the server, from console it works well but does not work with nrpe. Does a summoned creature play immediately after being summoned by a ready action? Services that are checked can be in one of four different states: Service checks are performed by plugins, which can return a state of OK, WARNING, UNKNOWN, or CRITICAL. The following figure shows soft states and hard states. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. service_description check http://MYIP/test.php This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. 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. 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. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. In order to make Nagios treat passive host check results in the same way as active check results, we need to enable the following option: By default, Nagios treats host results from passive checks as hard results. In such a case, checks are done by other programs, and their results are sent to Nagios. The following screenshot shows a complete overview of all the service checks that have been configured so far. To identify the status of a monitored service, Nagios runs a check plugin on it. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. 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. VS Code extension | 35 comentarios en LinkedIn Nagios can tell what the status of the service is by reading the exit code of the check. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. 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. And in Puppet agent, I have to define the environment (Dev, Test or Prod). An external application checks the status of a host or service. For example: 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. notifications_enabled 0 Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Nagios executes event handlers to handle hard states. 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. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . Active checks can be used to "poll" a device or service for status information every so often. A good example would be a server that is a part of an application, processing job queues using a database. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? To learn more, see our tips on writing great answers. You need to add the full path to it in the check_command. 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. The default FQDN used for testing is www.google.com, but it can be changed as needed. Pass the specified string as User Agent in HTTP header. 13. Nagios comes with a wide range of built-in scripts for monitoring services. The -S option is not working with 2.0 plugins. 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. Architect and design WAP data flow using BigData Platform. Detecting and dealing with state changes is what Nagios is all about. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. 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. In fact, we officially. Another difference is that active checks require much less effort to be set up when compared to passive checks. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. 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). 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. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Are there tables of wastage rates for different fruit and veg? As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. does the HTML display xx welcome xx? Now in your configuration for checks for a host you can create the following service check. Nagios.cfg is the main configuration file for your Nagios Core. How to install and configure Nagios Core. Add additional tags that should be sent in the HTTP header. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. It is vital to make sure only legitimate networks have access to the database. Far better then Nagios documentation. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. On-demand as needed for predictive service dependency checks. Nagios's primary mode of "service checking" is called an active check. In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. 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. Sometimes I find it tricky figuring out exactly what a plugin is doing. 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. 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). NPCA includes a service module that can check if a service is stopped. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. The time performed is specified in seconds. This example is going to restart the crond service as it is unlikely to cause any issues. Nagios check_by_ssh returns status 3 even though running the command manually works? To turn on everything you want to set debug_level=4095. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. How can I manually run a nagios check from the command line? 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. 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). Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. # Plugin commands (service and host check commands) # Arguments are likely to change between different . The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. 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. We make use of First and third party cookies to improve our user experience. In such cases, only reports regarding hard state changes are propagated across Nagios servers. 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. /usr/nagios/libexec/check_http .. This is a plugin for Nagios wich you can use to check if a linux service is running. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. When a URL is redirected, use this to either follow the URL, or send ok, warning, or critical notification, Specify the minimum and maximum page size expected in bytes. It only takes a minute to sign up. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? In many cases, the time taken is not enough, as some checks need to be performed over a longer period of time to have satisfactory results. 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. To figure this out I set nagios into debug mode with the configuration like this. More information on the NSCA addon can be found here. 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 See the HTML : 45 Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 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. I'd like to use the command line to run that particular check and get the output. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. you have the flexibility of sending the passive check to Nagios with a different hostname. Agree In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. This setting is done on all MySQL servers. Learn more about Stack Overflow the company, and our products. The documentation uses the example of: for . Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. How to handle a hobby that makes income in US. 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. Nagios allows applications and event handlers to send out passive check results for host objects. Service - Started Check to see if a service is started. Active checks are most common in the Nagios world.