Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Hi, thanks for your comment. It is called NSCA (Nagios Service Check Acceptor). nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. Use Puppet environments. For example . notifications_enabled 0 Nagios allows applications and event handlers to send out passive check results for host objects. Services are those which are used by Nagios to check something about a host. Nagios provides a sample configuration file, that we will use. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . 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. First you should define a command in the commands.cfg file. you have the flexibility of sending the passive check to Nagios with a different hostname. This yields less output to dig through. 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. 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. On-demand as needed for predictive service dependency checks. An external application checks the status on hosts/services and writes the result to External Command File. Nagios Turn Off All Notifications | 6 Methods Revealed Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Scheduled service checks are run in parallel. Passive Checks with Nagios ADMIN Magazine vegan) just to try it, does this inconvenience the caterers and staff? If I used the first method, I have to keep separate site.pp for each environment. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. The __HOST__ is a special service name, which represents the host check in Nagios. $ vi /usr/local/nagios/etc/servers/devserver.cfg The following file can be modified to do the job. Another example is where an application already processes information such as network bandwidth utilization. The check logic inside Nagios process starts the Active check. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Nagioshttpdgccgd. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. In an earlier post, I showed how to . Check HTTP Check whether Apache HTTP is running on a remote server using check_http. It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. This setting is done on all MySQL servers. The following figure shows soft states and hard states. So I decided to use the second method. Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. More information on dependencies can be found here. How can I manually run a nagios check from the command line? We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. The files and information on this site are the property of their respective owner(s). Service Checks - Nagios 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. Can i specify what a valid response is, i.e. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. How can we prove that the supernatural or paranormal doesn't exist? This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. On any device & OS. 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. Let us assume that the following custom application is also running in the network, listening on a particular port. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. In other cases, passive checks are the way to go. check_http -H hostname (or) -I ip-address {optional options}. It is vital to make sure only legitimate networks have access to the database. Is there a proper earth ground point in this switch box? Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that 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. Here is how it can be done. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Nagios can be used to monitor Apache web server as well. 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 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. For example: 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). . Add additional tags that should be sent in the HTTP header. The host or the services will be tested again and again till the time the status is permanent. 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. Linux Check Service - Nagios Exchange Monitor DNS server with Nagios Examen Nagios - Volume: 94 Questions + 7Labs Question: 1 Escalations 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. This command accepts the host name, status code, and the textual output from a check. Hosts and service configurations are the building blocks of Nagios Core. NSClient++ includes a service module that can check if a service is running. Cached checks will only provide a performance increase if you are making use of service dependencies. 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. To figure this out I set nagios into debug mode with the configuration like this. Nagios can tell what the status of the service is by reading the exit code of the check. 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. No software installation. thanks! Check WMI Plus includes a service module that can check if a service is running. This user is then granted all permission to all databases and will be used for monitoring. It also defines Nagios user and group under which Nagios instance is running. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Using the definition below, checks on the host will be performed after every 3 minutes. 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. 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. Let us see an example to perform checks on host Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. Establish a terminal session to your Nagios XI server and execute the following 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. Do not wait for whole document body to download. The line should look like: Define the standard checks that you will perform on every client with NRPE. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. Nagios dependencies.cfg example file. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Monitor whether the apache server is available. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. To turn on everything you want to set debug_level=4095. 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. Nagios will ignore all check results for services that had not been configured before it was last (re)started. 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).
Alec Gores Family, Articles N