How to monitor common services with Nagios - Xmodulo Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Here is my configuration : Service state changes can also trigger on-demand host checks. 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. NRDP Overview - force.com How to Define Nagios Timeperiod Exclude for Maintenance Window Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. For example, if you are bringing down your HTTP server everyday sometime between midnight and 1:59 a.m, you can specify the above "247-except-night-12-2" timeperiod in your service definition for the check_period and notification_period as shown below for your particular service definition. Nagios will ignore all check results for services that had not been configured before it was last (re)started. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Learn more about Stack Overflow the company, and our products. Affordable solution to train a team and make them project ready. 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. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. It will give you all the available options: See Also: Active Checks, Service Checks, Host 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. Format is minimum:maximum, Response time in seconds for warning state, Response time in seconds for critical state, Number of seconds to wait before connection times out. In Nagios, 2 types of checks are performed on hosts and services . You know the basics on Nagios administration. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. How to use check_cluster to monitor service availability of multiple NSClient++ includes a service module that can check if a service is running. Nagios executes event handlers to handle hard states. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. We can also do it at a contact level, by disabling notifications . 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, Scheduled service checks are run in parallel. 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 . The figure shown below shows a passive check . 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. For example . You might also want to give the 'capture' plugin a try. To turn on everything you want to set debug_level=4095. 03-16-2010, 10:31 AM . Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. Nagios will be configured to monitor SMTP and mail queue of the server. On-demand as needed for predictive service dependency checks. In the first case, Nagios takes care of the scheduling, and the command only needs to perform the actual checks and mark the results as OK/WARNING/CRITICAL based on how a check command is configured. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. 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. As mentioned earlier, server-2 has postfix mail server set up on it. 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). If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. 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. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. The default FQDN used for testing is www.google.com, but it can be changed as needed. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. The __HOST__ is a special service name, which represents the host check in Nagios. For example: All other servicemarks and trademarks are the property of their respective owner. 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 If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. By using this website, you agree with our Cookies Policy. In the following example, we are checking whether the website certificate expires in the next 365 days. Nagios can tell what the status of the service is by reading the exit code of the check. use generic-service ; Name of service template to use 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. A user [emailprotected] is created in MySQL server. 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. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. I've provided some comments here, but things may not be so # clear without further explanation. Nagios - Checks and States - tutorialspoint.com It's pretty simple. In this way, NSCA communication sent over the Internet is more secure. 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. 2. The host or the services will be tested again and again till the time the status is permanent. More information on the flap detection logic can be found here. 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. On a finishing note, Nagios can monitor many other sectors of a network. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file Minimum number of days a SSL certiface must be valid. Apply these agent configurations After the NRDP installation, install the NCPA. Hi, thanks for your comment. Host is just like a computer; it can be a physical device or virtual. Linux Check Service - Nagios Exchange Now in your configuration for checks for a host you can create the following service check. 5 Nagios check_http Plugin Examples for HTTP / HTTPS 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. This can be done in addition to active checks, to identify critical problems earlier. First you should define a command in the commands.cfg file. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nagioshttpdgccgd. For this reason, the only way to perform such a check is to schedule them from the systemfor example, using the cron daemon (visit http://man.linuxquestions.org/index.php?query=cron). Method 3. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. Service checks in LibreNMS (http, all other Nagios plugins) NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Otherwise we must rely on parsing the # output from the service management tool. Configure Docker Daemon for Remote Connections - kifarunix.com In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. 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. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Stop once the headers are downloaded. 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. does the HTML display xx welcome xx? Up To: Contents - specific URL support - ssl option - alternative port - fake user agent - proxy as parameter - proxy from environment variable Usage: check_website [OPTIONS] {HOSTNAME} {HOSTNAME} host to check (dns/ip) [OPTIONS]: Are there tables of wastage rates for different fruit and veg? Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. Nagios Core is an Open Source system for monitoring hosts, networks and services. 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. Check WMI Plus includes a service module that can check if a service is running. In such a case, checks are done by other programs, and their results are sent to Nagios. This allows for seamless integration of status information from external applications with Nagios. 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. 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. (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".) The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . 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. The -S option is not working with 2.0 plugins. nagiosrpm. More information on the NSCA addon can be found here. 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 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. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. NSCA stands for Nagios Service Check Acceptor. The plugins can be in any language, Nagios only cares They can be the following: 0: OK