NSClient++ includes a service module that can check if a service is running. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. Add additional tags that should be sent in the HTTP header. Nagios dependencies.cfg example file. How can I make Status Information for Nagios services easier to read? By default you do not need to change any of the lines in this file and . Always remember, prior to reloading Nagios, check that there are no errors in the configuration. Service - Started Check to see if a service is started. I Have problem with the check_http when I try ur command test , I have the next message : When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. When everything goes smoothly, we should be able to see our new Nagios client on the Nagios website with its new service OS: unread mail for root, as well as the status green OK. Nagios will ignore all check results for services that had not been configured before it was last (re)started. The best answers are voted up and rise to the top, Not the answer you're looking for? Check WMI Plus includes a service module that can check if a service is stopped. Passive checks are initiated and performed by external applications/processes, Passive check results are submitted to Nagios for processing, Asynchronous in nature and cannot be monitored effectively by polling their status on a regularly scheduled basis, Located behind a firewall and cannot be checked actively from the monitoring host. hello.. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. Hi, this is a fantastic article, i managed to learn how to make plugins myself. Agree 03-16-2010, 10:31 AM . Manual tuning is needed to tell MySQL to listen on other interfaces as well. Let us see an example to perform checks on host . 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. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. Remember that the $USER1$ variable, is a local Nagios variable set in the resource.cfg file, in my case pointing to /usr/local/nagios/libexec. This way, the other applications on your Nagios server can report the status of the hosts. The module defines a "good" service as one that is running and a "bad" service is one that is not running, so you can define critical is when more than 0 "good" services exist. . NRDP has several benefits over NSCA, including: Often, there are situations where active checks obviously fit better. Related Commands. First, the servers are defined in Nagios. Let us assume that the following custom application is also running in the network, listening on a particular port. 2. . Select check_cluster from the plugin pop-up menu. This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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. The time performed is specified in seconds. Nagios can be used to monitor Apache web server as well. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Check whether a document is older than x seconds. Pass the specified string as User Agent in HTTP header. Use Puppet environments. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. We make use of First and third party cookies to improve our user experience. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. 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. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. Nagios: Disable notifications from command line on Windows/Linux. # 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. 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. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. 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). debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. i.e: 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. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. However, applications on remote hosts can't do this so easily. This is the main configuration file of Nagios core. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". How can I manually run a nagios check from the command line? This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. 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! In this tutorial, the following three servers are being used. The figure shown below shows a passive check . (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".) It says Unknown option specified in config file , check_http -I 10.0.0.76 -p 8192 url=/MYServiceBus/ post= eregi=.Status_Code.0./Status_Code. }. VS Code extension | 35 comentarios en LinkedIn External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. The following screenshot shows a complete overview of all the service checks that have been configured so far. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. On a finishing note, Nagios can monitor many other sectors of a network. Set enable_notifications=0 in nagios.cfg. The check_init_service plugin does not support checking multiple services. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. More information on cached checks can be found here. With a little tweaking, Nagios can help monitor this application port as well. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. More information on dependencies can be found here. Complete a blank sample electronically to Does a summoned creature play immediately after being summoned by a ready action? This task is really easy as Nagios has a built-in command for this. The following file can be modified to do the job. Unlike active checks, Nagios will not take network topology into consideration by default. But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. nagiosrpm. 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. Nagios.cfg is the main configuration file for your Nagios Core. Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. >Mainly Focus on Kafka and Cloudera services, Cluster . While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. To do this: Navigate to Configuration > Command > New. 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. 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. Thanks for contributing an answer to Server Fault! Services are those which are used by Nagios to check something about a host. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Is it possible to check a web page through an authenticated proxy server? Securely download your document with other editable templates, any time, with PDFfiller. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: This allows for seamless integration of status information from external applications with Nagios. Affordable solution to train a team and make them project ready. How to Install Nagios? What is check_http? Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. 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). 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. 13. Cached checks will only provide a performance increase if you are making use of service dependencies. Far better then Nagios documentation. It has been designed to run . 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. 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. This usually calls for some effort. A good example of such a test is checking whether there are bad blocks on a disk. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. 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. This plugin uses systemctl is-active command, please check you have systemd. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. As with passive checks of hosts, all that is needed is to enable the global Nagios option to accept passive check results, and also enable this option for each service that should allow the passing of passive check results. The files and information on this site are the property of their respective owner(s). No software installation. How to install and configure Nagios Core. It will give you all the available options: By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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, use generic-service ; Name of service template to use

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