This article assumes you have a working knowledge of Nagios. This is a plugin for Nagios wich you can use to check if a linux service is running. Each of these options opens the Manage Service Template screen.The New option will have no pre-selected directive values, Copy lets you create a new template based on an existing templates properties, and Modify enables the editing of an . Often, you have situations where other applications can report if a certain service is working properly or not. Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Would you please be so kind as to help me? November 2012, by Simon Krenger. check_http: command not found. . Affordable solution to train a team and make them project ready. And in Puppet agent, I have to define the environment (Dev, Test or Prod). Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. We make use of First and third party cookies to improve our user experience. 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. So I will add at the end of the file the following block:Advertisement.banner-1{text-align:center;padding-top:20px!important;padding-bottom:20px!important;padding-left:0!important;padding-right:0!important;background-color:#eee!important;outline:1px solid #dfdfdf;min-height:335px!important}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-banner-1','ezslot_4',111,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-banner-1-0');.banner-1{text-align:center;padding-top:20px!important;padding-bottom:20px!important;padding-left:0!important;padding-right:0!important;background-color:#eee!important;outline:1px solid #dfdfdf;min-height:335px!important}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-banner-1','ezslot_5',111,'0','1'])};__ez_fad_position('div-gpt-ad-howtoforge_com-banner-1-0_1');.banner-1-multi-111{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. Now let us add check_interval directive. 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. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. No software installation. 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. 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. It is possible to configure Nagios so that it will receive status information sent over a command pipe. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. The check logic inside Nagios process starts the Active check. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Hi, thanks for your comment. I will use a simple example. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, I just used that simple script as an example, any language can be used to write your own custom plugin. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. The best answers are voted up and rise to the top, Not the answer you're looking for? It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. This example is going to restart the crond service as it is unlikely to cause any issues. 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. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. How to Write a Custom Nagios Check Plugin, /usr/local/nagios/etc/objects/commands.cfg, /usr/local/nagios/etc/objects/localhost.cfg, /usr/lib/nagios/plugins/check_users -w 5 -c 10, /usr/local/nagios/etc/objects/nrpeclient.cfg, Generic installation on Debian-based Client, Set the NRPE Check on the Server Configuration Files, Develop Network Applications for ESP8266 using Mongoose in Linux, How to Setup IKEv2 IPSec VPN Using strongSwan and Let's Encrypt on Rocky Linux 9, ISPConfig Perfect Multiserver setup on Ubuntu 20.04 and Debian 10, Generating Web Site Statistics With AWStats & JAWStats On Debian Lenny, How to Install Jitsi Video Conference Platform on Debian 11, How to Install LAMP Server Stack on Ubuntu 22.04, How to use grep to search for strings in files on the Linux shell, You have Nagios installed and running (You can follow this. You know the basics on Nagios administration. this is THE MOST comprehensive and straight forward turorial I've seen. A good example might be running a check that takes several hours to completein this case, it does not make sense to raise the global service_check_timeout option, but rather to schedule these checks outside of Nagios and only report the results back to it. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: Learn more. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. 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). # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nagioshttpdgccgd. 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. In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. It only takes a minute to sign up. 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. Passive checks are performed by external processes and the results are given back to Nagios for processing. 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). You need to add the full path to it in the check_command. Filters such as firewall and TCP wrappers should be used. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Repeat this procedure for each Ceph plug-in applicable to the node. This way, the other applications on your Nagios server can report the status of the hosts. 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. It allows to configure alerts and has different states for them. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Start the Nagios again. The line should look like: Define the standard checks that you will perform on every client with NRPE. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Manual tuning is needed to tell MySQL to listen on other interfaces as well. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. 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. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. To turn on everything you want to set debug_level=4095. This feature is only available to subscribers. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. VS Code extension | 35 comentarios en LinkedIn To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. # SAMPLE HOST CHECK . It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Check WMI Plus includes a service module that can check if a service is running. More information on the NSCA addon can be found here. NSClient++ includes a service module that can check if a service is stopped. Default is 80, This will use HTTPS using default 443 port. Passive checks are also used when configuring distributed or redundant monitoring installations. We make use of First and third party cookies to improve our user experience.
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