You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. 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 Nagios provides a sample configuration file, that we will use. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. Agree . Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. NSClient++ includes a service module that can check if a service is running. The host or the services will be tested again and again till the time the status is permanent. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? The following directive allows it: Setting up hosts or services for passive checking requires an object to be defined and set up so as not to perform active checks. To identify the status of a monitored service, Nagios runs a check plugin on it. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. 5 check_http Command Examples 1. Use Hiera. Up To: Contents First, install the Nagios Core server. 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. 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). Method 3. Stop once the headers are downloaded. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. For HTTPS running on a different port, do the following. Default is HTTP/1. How can I manually run a nagios check from the command line? In such cases, only reports regarding hard state changes are propagated across Nagios servers. Here is how it can be done. # These are some example service check commands. The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). 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. 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. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. i'm very new on that kind of progamming what does this line ", " means i really want to lear some but i need help please helpme. rev2023.3.3.43278. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. For example, you can use the 'check_http' plugin to verify that a web server is running, is returning the right text, or has an up-to-date SSL certificate. The -S option is not working with 2.0 plugins. 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. Some of the scripts provided with Nagios are restricted to the local server only. To turn on everything you want to set debug_level=4095. Next, update the remote Docker daemon DNS details on your hosts file if there is no local DNS; sudo tee -a "192.168.59.48 docker01.kifarunix.com docker01" >> /etc/hosts. Follow these steps to install the plugin: Download the plugin. You do this with nagios -v command as root: Ensure it returns 0 errors and 0 warnings and proceed to reload the service: After reloading the service, you will see the associated check in the localhost. Passive checks are performed by external processes and the results are given back to Nagios for processing. Check whether Apache HTTP is running on a remote server using check_http. This increases the security of the database. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. 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. # 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. 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. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. The same queue that is used for storing results from active checks is also used to store the results from passive checks. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. In the Select resource macro: section, select USER1. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. Nagios check_by_ssh returns status 3 even though running the command manually works? Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. Nagios Core is an Open Source system for monitoring hosts, networks and services. These checks are useful when you cannot monitor hosts/services on a regular basis. In Nagios, 2 types of checks are performed on hosts and services . Let us see an example to perform checks on host . 5 check_http examples Thank you for any assistance you can provide. 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. These checks help ensure that the dependency logic is as accurate as possible. If you preorder a special airline meal (e.g. When services change state too frequently they are considered to be "flapping". 2022 Company, Inc. All rights reserved. Asking for help, clarification, or responding to other answers. The application can also periodically let Nagios know if it succeeded in using the database without problems. These types of checks are called Active Checks. 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. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Last updated on September 22, 2020 by Sarmed Rahman. Is there a proper earth ground point in this switch box? When a host or service is down for a very short duration of time and its status is not known or different from previous one, then soft states are used. 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. Now send a trap and see how the service appears as in Nagios XI. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. nagiosrpm. No software installation. Often, you have situations where other applications can report if a certain service is working properly or not. Nagios will ignore all check results for services that had not been configured before it was last (re)started. An external application checks the status of a host or service. Monitoring Website URL Status In this way, NSCA communication sent over the Internet is more secure. Check whether Apache HTTPS is running on a remote server using check_http. The Nagios server is running on Ubuntu. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. Depending on the status received on hosts and services, appropriate action is taken. Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again. Add additional tags that should be sent in the HTTP header. The output indicates that it expires in 300 days. great! Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. The provided scripts contain help on the syntax. Nagios also offers a tool for sending passive check results for hosts and services over a network. Scheduled service checks are run in parallel. 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. 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. NSClient++ includes a service module that can check if a service is running. Another difference is that active checks require much less effort to be set up when compared to passive checks. Making statements based on opinion; back them up with references or personal experience. Using the definition below, checks on the host will be performed after every 3 minutes. Having managed large Nagios installations for many years, assigning services to hostgroups is an anti pattern and can make things complicated fast if your environment gets big. It only takes a minute to sign up. Check WMI Plus includes a service module that can check if a service is running. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. The plugins can be in any language, Nagios only cares They can be the following: 0: OK Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. 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. 2. The files and information on this site are the property of their respective owner(s). Fortra's Intermapper vs Kaseya Traverse: which is better? Nagios's primary mode of "service checking" is called an active check. 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. hello.. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Nagios can tell what the status of the service is by reading the exit code of the check. 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. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? After installing nagios and nagios-plugins-all (via yum), I've c. See the HTML : 45 Sometimes I find it tricky figuring out exactly what a plugin is doing. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Cached checks will only provide a performance increase if you are making use of service dependencies. (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 is called NSCA (Nagios Service Check Acceptor). 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. 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. We can also configure Nagios so that if no new information has been provided within a certain period of time, it will use active checks to get the current status of the host or service.