To identify the status of a monitored service, Nagios runs a check plugin on it. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! More information on how this works can be found here. This usually calls for some effort. How can I make Status Information for Nagios services easier to read? Agree For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Complete a blank sample electronically to Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. 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 . 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. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Syntax and Options Apply these agent configurations After the NRDP installation, install the NCPA. NSClient++ includes a service module that can check if a service is stopped. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . 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. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. 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. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. Go to the /usr/local/nagios/libexec dir (assuming you have installed nagios from source, if you have used a package from your distribution, check the docs of your package): $ cd /usr/local/nagios/libexec execute the check_dns plugin with the --help switch. Learn more about Stack Overflow the company, and our products. You have entered an incorrect email address! . Passive checks are also used when configuring distributed or redundant monitoring installations. They may or may not work on: 44 # your system, as they must be modified for your plugins. Nagios executes event handlers to handle hard states. # Plugin commands (service and host check commands) # Arguments are likely to change between different . Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. It can report each problem when accessing the database. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: define host { use generic-host host_name linuxbox01 address 10.0.2.1 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. Define the checks on /etc/nagios/nrpe_local.cfg. Method 2. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Are there tables of wastage rates for different fruit and veg? Related Commands. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Default is 80, This will use HTTPS using default 443 port. mark separates the command from the arguments in the check_command entry. How can I manually run a nagios check from the command line? Can i specify what a valid response is, i.e. awesome. We can also do it at a contact level, by disabling notifications . You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. The __HOST__ is a special service name, which represents the host check in Nagios. They have a lot of advantages and some disadvantages. The plugins can be in any language, Nagios only cares They can be the following: 0: OK Check WMI Plus includes a service module that can check if a service is stopped. However, if there are no jobs to process and the application is not using it, Nagios will not have up-to-date information about the database. If an application that resides on the same host as Nagios is sending passive host or service check results, it can simply write the results directly to the external command file as outlined above. In the Select resource macro: section, select USER1. The above definitions add a host called ubuntu_host and defines the services which will run on this host. A sample definition for a host that runs an active check if there has been no result provided within the last two hours: The following is an illustration showing when Nagios would invoke active checks: Each time there is at least one passive check result that is still valid (i.e., was received within the past two hours), Nagios will not perform any active checks. This way, the other applications on your Nagios server can report the status of the hosts. 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. One of the problems is that such checks can take only a couple of seconds to completea typical timeout for an active check to complete is 10 or 30 seconds. The processing of active and passive check results is essentially identical. It is called NSCA (Nagios Service Check Acceptor). Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! I've: 5 # provided some comments here, but things may not be so clear without further . The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. Kaydolmak ve ilere teklif vermek cretsizdir. 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. The script should then post results to the Nagios daemon. In other cases, passive checks are the way to go. Passive checks are performed by external processes and the results are given back to Nagios for processing. $ 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. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. Hosts and service configurations are the building blocks of Nagios Core. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Would you please be so kind as to help me? For example, you can use the 'check_http' plugin to verify that a web server is running, is returning the right text, or has an up-to-date SSL certificate. The example contains partial output. First, the servers are defined in Nagios. All other servicemarks and trademarks are the property of their respective owner. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. How to handle a hobby that makes income in US. These checks are useful when you cannot monitor hosts/services on a regular basis. 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. The following screenshot shows a complete overview of all the service checks that have been configured so far. 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. This example is going to restart the crond service as it is unlikely to cause any issues. Let us assume that the following custom application is also running in the network, listening on a particular port. Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. 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. define service{ This task is really easy as Nagios has a built-in command for this. But today when I am trying to post an XML message to the server, from console it works well but does not work with nrpe. Often, there are situations where active checks obviously fit better. Check whether Apache HTTPS is running on a remote server using check_http. nagiosrpm. It is vital to make sure only legitimate networks have access to the database. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Check whether a document is older than x seconds. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. 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! Monitoring Website URL Status The application can also periodically let Nagios know if it succeeded in using the database without problems. You need to add the full path to it in the check_command. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. The files and information on this site are the property of their respective owner(s). 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). When services change state too frequently they are considered to be "flapping". All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. The object file localhost.cfg allows for parameters to be passed to check_ssh. The line should look like: Define the standard checks that you will perform on every client with NRPE. It's pretty simple. In an earlier post, I showed how to . Let us see an example to perform checks on host Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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. Method 3. Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Default is HTTP/1. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. In general, if a check can be done quickly and does not require long running processes, it should definitely be done as an active service. The following file can be modified to do the job. The flexibility provided by Nagios is perfect for these case scenarios. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Nagios can be used to monitor Apache web server as well. You can create a host file inside the server directory of Nagios and mention the host and service definitions. As an example of the use of this script, the command that is sent to Nagios for host01, service PING, status code 0 (OK) and output RTT=57 ms is as follows: A very common scenario for using passive checks is a check that takes a very long time to complete. Start the Nagios again. How Nagios process handles passive check results can be defined in the main Nagios configuration file. Far better then Nagios documentation. 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 As with passive checks of hosts, all that is needed is to enable the global Nagios option to accept passive check results, and also enable this option for each service that should allow the passing of passive check results. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. And in Puppet agent, I have to define the environment (Dev, Test or Prod). Passive checks require all the logic related to what should be reported and when it should be checked to be put in an external application. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. 13. Minimum number of days a SSL certiface must be valid. This plugin uses systemctl is-active command, please check you have systemd. 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). Check whether Apache HTTP is running on a remote server using check_http. Now let us add check_interval directive. check_http: command not found. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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.
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