Nagios provides a sample configuration file, that we will use. First, the servers are defined in Nagios. # Defaults to 0, put to 1 for systemd. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. /usr/nagios/libexec/check_http .. 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. No software installation. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. I wrote a plugin in a bash script to check for current Warnings. The module can only check if the service is started, you could however use the negate plugin to invert the returned result from the plugin (hence making CRITICAL an OK state). 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. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. 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. Does a summoned creature play immediately after being summoned by a ready action? Consider the following script (check_warnings.sh): Based on the information provided by the nagiostats tool, I assume everything is ok if there are five or less services in Warning state.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-medrectangle-4','ezslot_1',108,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-medrectangle-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-medrectangle-4','ezslot_2',108,'0','1'])};__ez_fad_position('div-gpt-ad-howtoforge_com-medrectangle-4-0_1');.medrectangle-4-multi-108{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}. The module defines a "good" service as one that is running and a "bad" service is one that is not running, so you can define critical is when more than 0 "good" services exist. Hosts and service configurations are the building blocks of Nagios Core. Submitting Passive Check Results From Remote Hosts. 2. This usually calls for some effort. I test the command from command line successfull, but when I insert in configuration file (cfg) it gives Error: Service check command check_http -H MYIP -u http://MYIP/test.php specified in service HTTP for host Server01 not defined anywhere! How to handle a hobby that makes income in US. 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. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. First you should define a command in the commands.cfg file. In Nagios, 2 types of checks are performed on hosts and services . Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. It is vital to make sure only legitimate networks have access to the database. In an earlier post, I showed how to . Otherwise we must rely on parsing the # output from the service management tool. Up To: Contents This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. More information on cached checks can be found here. 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). This increases the security of the database. The documentation uses the example of: for . Connect and share knowledge within a single location that is structured and easy to search. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. For example . Cached checks will only provide a performance increase if you are making use of service dependencies. Learn more about Stack Overflow the company, and our products. Affordable solution to train a team and make them project ready. Securely download your document with other editable templates, any time, with PDFfiller. In the following example, we are checking whether the website certificate expires in the next 365 days. Last updated on September 22, 2020 by Sarmed Rahman. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. By default, Nagios handles results from active and passive checks differently. Here is my configuration : In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. So the Nagios Core version is 3.5.1. 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. A major difference between hosts and services is that service checks differentiate between soft and hard states. . The external application writes the results of the check to the. This way, the other applications on your Nagios server can report the status of the hosts. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. It is possible to configure Nagios so that it will receive status information sent over a command pipe. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation Learn more. Is there a more efficient way to do this? 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! mark separates the command from the arguments in the check_command entry. Do not wait for whole document body to download. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. A user [emailprotected] is created in MySQL server. Nagios also offers a tool for sending passive check results for hosts and services over a network. Default is HTTP/1. 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. What is check_http? First, install the Nagios Core server. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. Active checks are most common in the Nagios world. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? great! 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. When Nagios needs to run a scheduled service check, it will initiate the service check and then return to doing other work (running host checks, etc). Are there tables of wastage rates for different fruit and veg? Hi, thanks for your comment. This allows for seamless integration of status information from external applications with Nagios. If you would like to disable passive checks for just a few hosts or services, use the passive_checks_enabled directive in the host and/or service definitions to do so. There are no attachments for this article. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. All other servicemarks and trademarks are the property of their respective owner. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. I just used that simple script as an example, any language can be used to write your own custom plugin. You can create a host file inside the server directory of Nagios and mention the host and service definitions. It will give you all the available options: More information on dependencies can be found here. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). 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. You know the basics on Nagios administration. By default Nagios supports URL monitoring and there is an command check_http, however if you want to monitor URL like SSL certification you can also do by extending the command options. Nagios allows applications and event handlers to send out passive check results for host objects. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. Far better then Nagios documentation. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Add additional tags that should be sent in the HTTP header. NSCA stands for Nagios Service Check Acceptor. The plugin returns a CRITICAL state if the service is not started. To do this: Navigate to Configuration > Command > New. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. Syntax and Options Filters such as firewall and TCP wrappers should be used. command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. For example: After defining the command you can associate that command to a service, and then to a host. On a finishing note, Nagios can monitor many other sectors of a network. Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. Nagios Core is an Open Source system for monitoring hosts, networks and services. 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. vegan) just to try it, does this inconvenience the caterers and staff? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. We make use of First and third party cookies to improve our user experience. If I used the first method, I have to keep separate site.pp for each environment. The default FQDN used for testing is www.google.com, but it can be changed as needed. >Mainly Focus on Kafka and Cloudera services, Cluster . NPCA includes a service module that can check if a service is running. 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. I've: 5 # provided some comments here, but things may not be so clear without further . Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. It says -S is for version. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? In the Select resource macro: section, select USER1. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. 2. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! So if you wanted to run the check_http check from the CLI, you would run ./check_http -I, where the I flag stands for the IP Address (, I struggled to get this to work, not sure what i was doing wrong (noob) but the debug_level trick worked for me :). 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. VS Code extension | 35 comentarios en LinkedIn See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. # 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. The above definitions add a host called ubuntu_host and defines the services which will run on this host. 5 check_http Command Examples 1. Monitor whether the apache server is available. These types of checks are called Active 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. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. 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' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. check_http: command not found. Up To: Contents 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. In this way, NSCA communication sent over the Internet is more secure. 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 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. Here is another example to check CPU: nagios will indicate warning if the % cpu utilized by any process is greater than 70% and will indicate critical alert if the % cpu is greater that 80% Nagios.cfg is the main configuration file for your Nagios Core. you have the flexibility of sending the passive check to Nagios with a different hostname. I will use a simple example. 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. The files and information on this site are the property of their respective owner(s). It only takes a minute to sign up. Thank you for any assistance you can provide. 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. Sometimes I find it tricky figuring out exactly what a plugin is doing. NRDP has several benefits over NSCA, including: In order to use them, the host needs to be configured to accept passive checks results. rev2023.3.3.43278. Nagios also offers another way to work with the statuses of hosts and services. Nagios also supports a way to monitor hosts and services passively instead of actively. They have a lot of advantages and some disadvantages. (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".)
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