Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. you have the flexibility of sending the passive check to Nagios with a different hostname. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. Nagios Core is an Open Source system for monitoring hosts, networks and services. All other servicemarks and trademarks are the property of their respective owner. This can be done in addition to active checks, to identify critical problems earlier. As a Cloudera Administrator and Kafka service owner, leading Kafka/flume/ZK services in WAP (Multi DC Environment), Leading TICK Stack (Influxdb) and Grafana along with Administration of ELK Stack (Elasticsearch, Logstash) and Cloudera Clusters with CI/CD approach, Automation. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. The plugin returns a CRITICAL state if the service is not started. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. No software installation. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. It also defines Nagios user and group under which Nagios instance is running. Some of the scripts provided with Nagios are restricted to the local server only. More information on the NSCA addon can be found here. define service{ So the Nagios Core version is 3.5.1. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. Far better then Nagios documentation. When everything goes smoothly, we should be able to see our new Nagios client on the Nagios website with its new service OS: unread mail for root, as well as the status green OK. Nagios also offers a tool for sending passive check results for hosts and services over a network. Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. The best answers are voted up and rise to the top, Not the answer you're looking for? In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". As mentioned earlier, server-2 has postfix mail server set up on it. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. After installing nagios and nagios-plugins-all (via yum), I've c. 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. >Mainly Focus on Kafka and Cloudera services, Cluster . These checks are useful when you cannot monitor hosts/services on a regular basis. There are also different types of checks including external applications or devices that want to report information directly to Nagios. 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). In this way, NSCA communication sent over the Internet is more secure. We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. 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. great! Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. This command accepts the host name, status code, and the textual output from a check. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Related Commands. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. How can I make Status Information for Nagios services easier to read? 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}. These checks can provide useful insight on what is going on within the Nagios server. We make use of First and third party cookies to improve our user experience. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. Are there tables of wastage rates for different fruit and veg? Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. More information on cached checks can be found here. NPCA includes a service module that can check if a service is running. Does a summoned creature play immediately after being summoned by a ready action? Using the definition below, checks on the host will be performed after every 3 minutes. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. 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! A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). Server Fault is a question and answer site for system and network administrators. rev2023.3.3.43278. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. 5 check_http Command Examples 1. Attributes can be used for both hosts and services. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Check WMI Plus includes a service module that can check if a service is stopped. 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. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. Passive checks are useful for monitoring services that are: Examples of asynchronous services that lend themselves to being monitored passively include SNMP traps and security alerts. 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. How Nagios process handles passive check results can be defined in the main Nagios configuration file. In such a case, checks are done by other programs, and their results are sent to Nagios. The following line is commented out to make MySQL listens on all interfaces. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. 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. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nagios also supports a way to monitor hosts and services passively instead of actively. Nagios will ignore all check results for services that had not been configured before it was last (re)started. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. check_http -H hostname (or) -I ip-address {optional options}. The results are passed to Nagios in the same way as they are passed for hosts. Default is 10 seconds. Default is HTTP/1. By default you do not need to change any of the lines in this file and . Active checks are initiated by Nagios process and then run on a regular scheduled basis. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. To allow it to grow bigger before rotating, add more zeroes, for example. this is more along the lines of what i meant. Up To: Contents This will give an idea on whether the execution will be successful and what the output of the script will look like. Often, you have situations where other applications can report if a certain service is working properly or not. 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, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Apply these agent configurations After the NRDP installation, install the NCPA. Pass the specified string as User Agent in HTTP header. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. The documentation uses the example of: for . 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. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. 5 check_http examples Is it possible to check a web page through an authenticated proxy server? How can I get it to work with https with Nagios4 and plugins 2.x? When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Force a check and you will see exactly how the command is being run. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. 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. Rather, Nagios takes the passive check result to be the actual state the host is in and doesn't try to determine the host's actual state using the reachability logic. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. The Nagios server is running on Ubuntu. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Having managed large Nagios installations for many years, assigning services to hostgroups is an anti pattern and can make things complicated fast if your environment gets big. host_name Server01 28. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. 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. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Cached checks will only provide a performance increase if you are making use of service dependencies. 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. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, 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. November 2012, by Simon Krenger. # 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. All other servicemarks and trademarks are the property of their respective owner. In this tutorial, the following three servers are being used. Kaydolmak ve ilere teklif vermek cretsizdir. Syntax and Options Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Asking for help, clarification, or responding to other answers. The same queue that is used for storing results from active checks is also used to store the results from passive checks. I just used that simple script as an example, any language can be used to write your own custom plugin. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile # Defaults to 0, put to 1 for systemd. How to install and configure Nagios Core. i.e: Affordable solution to train a team and make them project ready. Get your subscription here. }. Nagios Core and Nagios XI has a features to monitoring website URL status. Host is just like a computer; it can be a physical device or virtual. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. It has been designed to run . 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. use generic-service ; Name of service template to use The following is a sample script that will accept the host name, status code, and output from a check and will submit these to Nagios: As an example of the use of this script, the command that is sent to Nagios for host01, status code 2 (UNREACHABLE) and output router 192.168.1.2 down would be as follows: When submitting results, it is worth noting that Nagios might take some time to process them, depending on the intervals between Nagios checks of the external command pipe. 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 Is there a proper earth ground point in this switch box? Monitoring Website URL Status The processing of active and passive check results is essentially identical. 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 . Method 3. The check logic inside Nagios process starts the Active check. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. This command accepts the host name, service description, status code, and the textual output from a check. To check whether a specific webpage is available, use the -u option as shown below. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! 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. this is THE MOST comprehensive and straight forward turorial I've seen. 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. Securely download your document with other editable templates, any time, with PDFfiller. This is how your host definitions look currently . Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. 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. In the following example, we are checking whether the website certificate expires in the next 365 days. Another difference is that active checks require much less effort to be set up when compared to passive checks. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. They may or may not work on: 44 # your system, as they must be modified for your plugins. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. $ check_http -H 192.168.1.50 HTTP OK HTTP/1.1 200 OK - 332 bytes in 0.004 seconds |time=0.004144s;;;0.000000 size=332B;;;0 2. Check whether a document is older than x seconds. The following file can be modified to do the job. An external application checks the status on hosts/services and writes the result to External Command File. I Have problem with the check_http when I try ur command test , I have the next message : The plugins can be in any language, Nagios only cares They can be the following: 0: OK 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. vegan) just to try it, does this inconvenience the caterers and staff? You can create a host file inside the server directory of Nagios and mention the host and service definitions. check_command check_http -H MYIP -u http://MYIP/test.php You can check whether a SSL certificate of the website expires within the next X number of days as shown below. We want Nagios to monitor this database, and as the application is already using it, we can add a module that reports this to Nagios. A user [emailprotected] is created in MySQL server. This is the main configuration file of Nagios core. Viewed 12725 times since Tue, Nov 14, 2017, Viewed 18667 times since Tue, Nov 28, 2017, Viewed 70502 times since Thu, Nov 9, 2017, Viewed 9709 times since Tue, Nov 14, 2017, Viewed 12197 times since Wed, Nov 29, 2017, Viewed 47389 times since Thu, Nov 9, 2017, Viewed 14647 times since Sun, Nov 26, 2017, Viewed 42173 times since Mon, Nov 13, 2017, Viewed 18034 times since Wed, Nov 15, 2017, Viewed 22586 times since Sun, Nov 26, 2017. I am running into the same problem as David 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. It's pretty simple. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. 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. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. In an earlier post, I showed how to . Nonetheless, they can be tuned to match the requirements. These are executed on regular intervals, as defined by check_interval and retry_interval. You know the basics on Nagios administration. If I used the first method, I have to keep separate site.pp for each environment. Try to put full path in the command line. This article assumes you have a working knowledge of Nagios. In the Select resource macro: section, select USER1. 2. Here is my configuration : 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). In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. Indicate content type in header for POST request, Regular expression can span to new line (Use this with -r or -R option), Use this regular expression to search for string in the HTTP page, If the site user basic authentication send uid, pwd in the format uid:pwd. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. The figure shown below shows a passive check . Also, MySQL would not let just any host to connect to it.
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nagios service check example