This command accepts the host name, service description, status code, and the textual output from a check. 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. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. To identify the status of a monitored service, Nagios runs a check plugin on it. 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. See the HTML : 45 Architect and design WAP data flow using BigData Platform. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. In the following example, we are checking whether the website certificate expires in the next 365 days. Nagios Core and Nagios XI has a features to monitoring website URL status. The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). Is it possible to check a web page through an authenticated proxy server? Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Use Hiera. Hi, thanks for your comment. To check whether a specific webpage is available, use the -u option as shown below. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. 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. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. By using this website, you agree with our Cookies Policy. Nagios allows applications and event handlers to send out passive check results for host objects. 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. 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. 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. Indicate content type in header for POST request, Regular expression can span to new line (Use this with -r or -R option), Use this regular expression to search for string in the HTTP page, If the site user basic authentication send uid, pwd in the format uid:pwd. check_http -H hostname (or) -I ip-address {optional options}. The service check runs in a child process that was fork()ed from the main Nagios daemon. You need to add the full path to it in the check_command. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. 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). Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? In this way, NSCA communication sent over the Internet is more secure. Nagios executes event handlers to handle hard states. When Nagios plans and receives results from active checks, it takes the actual network topology into consideration and performs a translation of the states based on this. Agree rev2023.3.3.43278. Up To: Contents I wrote a plugin in a bash script to check for current Warnings. 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. Service status codes are the same as those for active checks0 for OK, 1 for WARNING, 2 for CRITICAL, and 3 for an UNKNOWN state. To figure this out I set nagios into debug mode with the configuration like this. JOB, Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Get your subscription here. 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. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. 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. Nagios also offers a tool for sending passive check results for hosts and services over a network. The plugin returns a CRITICAL state if the service is not started. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. /usr/nagios/libexec/check_http .. Nagios also offers another way to work with the statuses of hosts and services. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. Nagios dependencies.cfg example file. Asking for help, clarification, or responding to other answers. Does anyone have a working example of a dependencies.cfg file for nagios? This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Far better then Nagios documentation. NSClient++ includes a service module that can check if a service is running. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. The default FQDN used for testing is www.google.com, but it can be changed as needed. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. This is the main configuration file of Nagios core. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. For example, to set up a very similar service, all we need to do is to use the same parameters as those for the hosts: In this case, Nagios will never perform any active checks on its own and will only rely on the results that are passed to it. Connect and share knowledge within a single location that is structured and easy to search. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. This allows for seamless integration of status information from external applications with Nagios. @sunardo I just ran into this exact same thing. NPCA includes a service module that can check if a service is running. There would be many cases when the failures will happen randomly and they are temporary; hence Nagios uses states to check the current status of a host or service. Would you please be so kind as to help me? 2022 Company, Inc. All rights reserved. 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. nagiosrpm. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. Set enable_notifications=0 in nagios.cfg. November 2012, by Simon Krenger. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. I am running into the same problem as David Check whether Apache HTTPS is running on a remote server using check_http. 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. Last updated on September 22, 2020 by Sarmed Rahman. No software installation. Using the definition below, checks on the host will be performed after every 3 minutes. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. Now that the syntax is available, TCP port 80 can be checked as follows. Nagios can tell what the status of the service is by reading the exit code of the check. 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. Attributes can be used for both hosts and services. The sections below provide examples of how to perform these checks using different methods. mark separates the command from the arguments in the check_command entry. The script should then post results to the Nagios daemon. 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. Active checks are most common in the Nagios world. How to handle a hobby that makes income in US. To learn more, see our tips on writing great answers. Affordable solution to train a team and make them project ready. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). 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. This increases the security of the database. 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. Up To: Contents On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. Copy the configuration file to the Apache directory: /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.conf Install the Nagios Plugins to have a set of tools to monitor your different services: apt install build-essential libssl-dev gcc