nagios service check example

In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. Hosts and service configurations are the building blocks of Nagios Core. Filters such as firewall and TCP wrappers should be used. Last updated on September 22, 2020 by Sarmed Rahman. vegan) just to try it, does this inconvenience the caterers and staff? Add additional tags that should be sent in the HTTP header. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Here is an example set of passive checks that . Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. In this way, NSCA communication sent over the Internet is more secure. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. 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. . 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 following figure shows soft states and hard states. 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. This way, the other applications on your Nagios server can report the status of the hosts. 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. Testing the Commands from Nagios XI Server Now we will test from the Nagios XI server that the command you just added to the NRPE client on the Linux server is working. $ 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. Host is just like a computer; it can be a physical device or virtual. See Also: Active Checks, Service Checks, Host Checks. 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. To keep the article focused on service monitoring, we will not be configuring hostgroups or templates, as they have been covered in the previous tutorial. What is check_http? I Have problem with the check_http when I try ur command test , I have the next message : 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. As the Nagios toolsets, including NSCA (Nagios Service Check Acceptor for submitting passive check results to the Nagios core server) and NRPE (Nagios Remote Plugin Executor for accepting active check requests from the Nagios core server and send back the results), were initially only developed for Unix-based and Linux Operating Systems, This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. This user is then granted all permission to all databases and will be used for monitoring. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. On-demand as needed for predictive service dependency checks. 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. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. use generic-service ; Name of service template to use For those unfamiliar with Nagios, it is a monitoring system which can execute checks. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. In such cases, only reports regarding hard state changes are propagated across Nagios servers. In an earlier post, I showed how to . Note: A host must be defined in Nagios before you can submit passive check results for it! Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. And in Puppet agent, I have to define the environment (Dev, Test or Prod). Use Puppet environments. # Defaults to 0, put to 1 for systemd. This can be done in addition to active checks, to identify critical problems earlier. 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. 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. . For example: 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. The figure shown below shows a passive check . Why is there a voltage on my HDMI and coaxial cables? The same queue that is used for storing results from active checks is also used to store the results from passive checks. How Nagios process handles passive check results can be defined in the main Nagios configuration file. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile You can check whether a SSL certificate of the website expires within the next X number of days as shown below. 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). The time performed is specified in seconds. The following is a script that runs the dd system command (visit http://man.linuxquestions.org/index.php?query=dd) to read an entire block device. To figure this out I set nagios into debug mode with the configuration like this. We make use of First and third party cookies to improve our user experience. Services are those which are used by Nagios to check something about a host. 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. The output indicates that it expires in 300 days. Nagios check_by_ssh returns status 3 even though running the command manually works? 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. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. So the Nagios Core version is 3.5.1. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. NPCA includes a service module that can check if a service is running. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. In other cases, passive checks are the way to go. 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. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. The service check runs in a child process that was fork()ed from the main Nagios daemon. You have entered an incorrect email address! NSClient++ includes a service module that can check if a service is running. A good example of such a test is checking whether there are bad blocks on a disk. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file this is more along the lines of what i meant. To do this: Navigate to Configuration > Command > New. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 28. 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 following screenshot shows a complete overview of all the service checks that have been configured so far. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nonetheless, they can be tuned to match the requirements. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. The default FQDN used for testing is www.google.com, but it can be changed as needed. hello.. 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! It shows what is performed by Nagios in both cases and what needs to be done by the check command or an external application for passive checks. Does a summoned creature play immediately after being summoned by a ready action? I don't know if it's best practice or not , but i would declare count Warnings as an integer variable when doing arithmetic operations. These checks can provide useful insight on what is going on within the Nagios server. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. This usually calls for some effort. How to install and configure nagios on centos 7 step by step ile ilikili ileri arayn ya da 22 milyondan fazla i ieriiyle dnyann en byk serbest alma pazarnda ie alm yapn. Nagios Core and Nagios XI has a features to monitoring website URL status. Try to put full path in the command line. If you would like to use the whole or any part of this article, you need to cite this web page at Xmodulo.com as the original source. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. In such a case, checks are done by other programs, and their results are sent to Nagios. Check WMI Plus includes a service module that can check if a service is stopped. I will use a simple example. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. 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 Check WMI Plus includes a service module that can check if a service is running. Check whether Apache HTTPS is running on a remote server using check_http. nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The following settings are done for all MySQL servers. The results are passed to Nagios in the same way as they are passed for hosts. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. Nagios also offers a tool for sending passive check results for hosts and services over a network. You need to add the full path to it in the check_command. It says -S is for version. 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. Kaydolmak ve ilere teklif vermek cretsizdir. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. It can report each problem when accessing the database. More information on how this works can be found here. Default is HTTP/1. thank you! The best answers are voted up and rise to the top, Not the answer you're looking for? This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. On-demand checks are performed as part of the predictive service dependency check logic. 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. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. It only takes a minute to sign up. 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). 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. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Manual tuning is needed to tell MySQL to listen on other interfaces as well. 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. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Service - Started Check to see if a service is started. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. Minimum number of days a SSL certiface must be valid. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. The check logic inside Nagios process starts the Active check. Nagios will be configured to monitor SMTP and mail queue of the server. 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Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. 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. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . To allow it to grow bigger before rotating, add more zeroes, for example. Stop once the headers are downloaded. 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 provided scripts contain help on the syntax. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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. . This increases the security of the database. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. An external application checks the status of a host or service. Save my name, email, and website in this browser for the next time I comment. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. Now send a trap and see how the service appears as in Nagios XI. 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. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. Apply these agent configurations After the NRDP installation, install the NCPA. Agree How can I get it to work with https with Nagios4 and plugins 2.x? Passive service checks are often used to report the results of long lasting tests asynchronously. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. 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. 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 sections below provide examples of how to perform these checks using different methods. VS Code extension | 35 comentarios en LinkedIn 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. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. The following diagram shows how both active and passive checks are performed by Nagios. Nagios allows applications and event handlers to send out passive check results for host objects. Far better then Nagios documentation. 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 . will hold the return value of commands between $( ). On-demand service checks are also run in parallel if needed. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Use Hiera. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down.