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 can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. This task is really easy as Nagios has a built-in command for this. The check logic inside Nagios process starts the Active check. Nagios check_by_ssh returns status 3 even though running the command manually works? This means that if Nagios receives a result indicating that a host is DOWN, it assumes that all child hosts are in an UNREACHABLE state. 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. Last updated on September 22, 2020 by Sarmed Rahman. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Does a summoned creature play immediately after being summoned by a ready action? How to install and configure Nagios Core. 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. 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! 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. NSClient++ includes a service module that can check if a service is running. Is there a more efficient way to do this? You can create a host file inside the server directory of Nagios and mention the host and service definitions. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . Apply these agent configurations After the NRDP installation, install the NCPA. sudo usermod -aG docker kifarunix. 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. @sunardo I just ran into this exact same thing. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. You never know how many (if any) traps or alerts you'll receive in a given time frame, so it's not feasible to just monitor their status every few minutes. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. November 2012, by Simon Krenger. We make use of First and third party cookies to improve our user experience. 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. Often, there are situations where active checks obviously fit better. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. vegan) just to try it, does this inconvenience the caterers and staff? if one of my checked systems goes down, and therefore fails a PING check, I do NOT need to be notified that a file system is unavailable, or that SSH is down, too. The following file can be modified to do the job. Here is my configuration : It is a protocol that is used in reverse of the other common Nagios protocol NRPE. host_name Server01 Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. . On a finishing note, Nagios can monitor many other sectors of a network. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. 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. Does anyone have a working example of a dependencies.cfg file for nagios? 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. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Here is how it can be done. Is there a proper earth ground point in this switch box? The following line is commented out to make MySQL listens on all interfaces. 28. 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. Just cd (or not) into the plugins directory (this directory location varies, depending on how you've installed it, but check /usr/local/nagios, or /usr/lib/nagios). 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. I'd like to use the command line to run that particular check and get the output. 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. A major difference between hosts and services is that service checks differentiate between soft and hard states. 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. Use Hiera. Nagios dependencies.cfg example file. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. An external application checks the status on hosts/services and writes the result to External Command File. How to use it? The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. 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. This usually calls for some effort. 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, For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. All other servicemarks and trademarks are the property of their respective owner. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. 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. A user [emailprotected] is created in MySQL server. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. For example . Note that all the configuration in this section is done on the client to be checked, not in the nagios server. The above definitions add a host called ubuntu_host and defines the services which will run on this host. This is a plugin for Nagios wich you can use to check if a linux service is running. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . Would you please be so kind as to help me? They have a lot of advantages and some disadvantages. Note: A host must be defined in Nagios before you can submit passive check results for it! Nagios can be used to monitor Apache web server as well. Save my name, email, and website in this browser for the next time I comment. The flexibility provided by Nagios is perfect for these case scenarios. Another difference is that active checks require much less effort to be set up when compared to 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. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. For Nagios to perform active checks when there is no up-to-date result from passive checks, you need to set the check_freshness directive to 1 and set freshness_threshold to the time period after which a check should be performed. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. I've: 5 # provided some comments here, but things may not be so clear without further . Get your subscription here. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? More information on cached checks can be found here. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, More information on the flap detection logic can be found here. The files and information on this site are the property of their respective owner(s). Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Yeah, it's totally brute-force, but
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