The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. define service{ A good example of such a test is checking whether there are bad blocks on a disk. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. # 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. If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. 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. Some methods support checking multiple services at once. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Is there a more efficient way to do this? In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. Cached checks will only provide a performance increase if you are making use of service dependencies. Some of the scripts provided with Nagios are restricted to the local server only. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, 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. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on 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. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. More information on the flap detection logic can be found here. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Nagios check_by_ssh returns status 3 even though running the command manually works? 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 . 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. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Note: A host must be defined in Nagios before you can submit passive check results for it! 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. . 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. Passive checks are also used when configuring distributed or redundant monitoring installations. Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. 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. Yeah, it's totally brute-force, but it works for me. Does a summoned creature play immediately after being summoned by a ready action? Let us see an example to perform checks on host . 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. notifications_enabled 0 This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. Apply these agent configurations After the NRDP installation, install the NCPA. check_http: command not found. Method 2. November 2012, by Simon Krenger. Nagios also offers a way of combining the benefits of both active and passive checks. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. mark separates the command from the arguments in the check_command entry. To allow it to grow bigger before rotating, add more zeroes, for example. 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. The default FQDN used for testing is www.google.com, but it can be changed as needed. Active checks are most common in the Nagios world. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. i'm very new on that kind of progamming what does this line ", " means i really want to lear some but i need help please helpme. Last updated on September 22, 2020 by Sarmed Rahman. @sunardo I just ran into this exact same thing. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. vegan) just to try it, does this inconvenience the caterers and staff? No software installation. You can create a host file inside the server directory of Nagios and mention the host and service definitions. # Defaults to 0, put to 1 for systemd. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. On any device & OS. Nagios can check whether the server is online by running ping on the IP/name of the server as well as it can be set up to provide warnings in case the round trip time (RTT) to the server increases. On-demand service checks are also run in parallel if needed. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. And in Puppet agent, I have to define the environment (Dev, Test or Prod). Check WMI Plus includes a service module that can check if a service is running. Monitor whether the apache server is available. Nagios: Simple Oracle Check. JOB, This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. 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 Manual tuning is needed to tell MySQL to listen on other interfaces as well. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. This task is really easy as Nagios has a built-in command for this. 2. 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. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. 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. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. The figure shown below shows an active check . 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. Here is how it can be done. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. The best answers are voted up and rise to the top, Not the answer you're looking for? Scheduled service checks are run in parallel. 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. Agree Active checks are initiated by Nagios process and then run on a regular scheduled basis. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Depending on the status received on hosts and services, appropriate action is taken. It can report each problem when accessing the database. As this tutorial is based on Debian 9, I will show as an example how to install it, but you can find instructions for any distribution. 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. How to handle a hobby that makes income in US. Establish a terminal session to your Nagios XI server and execute the following command: Force a check and you will see exactly how the command is being run. Are there tables of wastage rates for different fruit and veg? 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Attributes can be used for both hosts and services. Nagios can tell what the status of the service is by reading the exit code of the check. Sometimes I find it tricky figuring out exactly what a plugin is doing. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. # Plugin commands (service and host check commands) # Arguments are likely to change between different . thank you! The figure shown below shows a passive 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}. 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