nagios service check example

You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Nagios can tell what the status of the service is by reading the exit code of the check. These plugin states directly translate to service states. can nagios adjust its check time based on the status info? They may or may not work on: 44 # your system, as they must be modified for your plugins. Often, you have situations where other applications can report if a certain service is working properly or not. NSClient++ includes a service module that can check if a service is running. The output indicates that it expires in 300 days. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Active checks are most common in the Nagios world. More information on dependencies can be found here. 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. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Check whether Apache HTTP is running on a remote server using check_http. 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 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. The following directive allows it: Setting up hosts or services for passive checking requires an object to be defined and set up so as not to perform active checks. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. See Also: Active Checks, Service Checks, Host Checks. In fact, we officially. The files and information on this site are the property of their respective owner(s). The object file localhost.cfg allows for parameters to be passed to check_ssh. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. A user [emailprotected] is created in MySQL server. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. Does anyone have a working example of a dependencies.cfg file for nagios? For example . 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! I Have problem with the check_http when I try ur command test , I have the next message : The following figure shows soft states and hard states. this is more along the lines of what i meant. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Nagios dependencies.cfg example file. 2022 Company, Inc. All rights reserved. 2. Note that there are possible security implications of this change, so it's worth mentioning a few words: The following tuning should do the trick. 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}. 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. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. It is called NSCA (Nagios Service Check Acceptor). This command accepts the host name, service description, status code, and the textual output from a check. 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. Complete a blank sample electronically to Is it possible to check a web page through an authenticated proxy server? How to install and configure Nagios Core. If I used the first method, I have to keep separate site.pp for each environment. Is there a proper earth ground point in this switch box? 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. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. 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. 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. 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. 13. # 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. 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. In an earlier post, I showed how to . In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. Otherwise we must rely on parsing the # output from the service management tool. So I decided to use the second method. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). Server Fault is a question and answer site for system and network administrators. 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 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. Nagios allows applications and event handlers to send out passive check results for host objects. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. # SAMPLE HOST CHECK . @sunardo I just ran into this exact same thing. 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. 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. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . thanks! After defining the command you can associate that command to a service, and then to a host. The external application writes the results of the check to the. How can I manually run a nagios check from the command line? There are also different types of checks including external applications or devices that want to report information directly to Nagios. They have a lot of advantages and some disadvantages. I've: 5 # provided some comments here, but things may not be so clear without further . . - specific URL support - ssl option - alternative port - fake user agent - proxy as parameter - proxy from environment variable Usage: check_website [OPTIONS] {HOSTNAME} {HOSTNAME} host to check (dns/ip) [OPTIONS]: (1)Nagios. By using this website, you agree with our Cookies Policy. . More information on cached checks can be found here. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). You know the basics on Nagios administration. NSClient++ includes a service module that can check if a service is stopped. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. These checks can provide useful insight on what is going on within the Nagios server. This is very important in situations where a host behind a router is reported to be down because the router is actually down. First, install the Nagios Core server. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. This plugin uses systemctl is-active command, please check you have systemd. 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. We make use of First and third party cookies to improve our user experience. 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. check_http -H hostname (or) -I ip-address {optional options}. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. How to Write a Custom Nagios Check Plugin, /usr/local/nagios/etc/objects/commands.cfg, /usr/local/nagios/etc/objects/localhost.cfg, /usr/lib/nagios/plugins/check_users -w 5 -c 10, /usr/local/nagios/etc/objects/nrpeclient.cfg, Generic installation on Debian-based Client, Set the NRPE Check on the Server Configuration Files, Develop Network Applications for ESP8266 using Mongoose in Linux, How to Setup IKEv2 IPSec VPN Using strongSwan and Let's Encrypt on Rocky Linux 9, ISPConfig Perfect Multiserver setup on Ubuntu 20.04 and Debian 10, Generating Web Site Statistics With AWStats & JAWStats On Debian Lenny, How to Install Jitsi Video Conference Platform on Debian 11, How to Install LAMP Server Stack on Ubuntu 22.04, How to use grep to search for strings in files on the Linux shell, You have Nagios installed and running (You can follow this. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. can anyone help me out for this problem:-, Check-Website-Response Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. Get your subscription here. Passive Checks and NSCA (Nagios Service Check Acceptor), Technology news, insights and tutorials from Packt, Top 6 Cybersecurity Books from Packt to Accelerate Your Career, Your Quick Introduction to Extended Events in Analysis Services from Blog, Logging the history of my past SQL Saturday presentations from Blog, Storage savings with Table Compression from Blog Posts SQLServerCentral, Daily Coping 31 Dec 2020 from Blog Posts SQLServerCentral, Learning Essential Linux Commands for Navigating the Shell Effectively, Exploring the Strategy Behavioral Design Pattern in Node.js, How to integrate a Medium editor in Angular 8, Implementing memory management with Golangs garbage collector, How to create sales analysis app in Qlik Sense using DAR, http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114, ExploringForms in Angular types, benefits and differences. 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. Up To: Contents Cached checks will only provide a performance increase if you are making use of service dependencies. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, The provided scripts contain help on the syntax. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. It will give you all the available options: Submitting Passive Check Results From Remote Hosts. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Architect and design WAP data flow using BigData Platform. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). 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. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. 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. The above definitions add a host called ubuntu_host and defines the services which will run on this host. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Note: A service must be defined in Nagios before you can submit passive check results for it! Another example is where an application already processes information such as network bandwidth utilization. In order to use them, the host needs to be configured to accept passive checks results. 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. 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% As mentioned earlier, server-2 has postfix mail server set up on it. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. hello.. 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. Stop once the headers are downloaded. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. It has been designed to run . The example contains partial output. 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). How can I get it to work with https with Nagios4 and plugins 2.x? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Passive checks are performed by external processes and the results are given back to Nagios for processing. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Force a check and you will see exactly how the command is being run. Here is how it can be done. This can be done in addition to active checks, to identify critical problems earlier. 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. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. great! A good example of such a test is checking whether there are bad blocks on a disk. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. Check WMI Plus includes a service module that can check if a service is stopped. It says -S is for version. You need to add the full path to it in the check_command. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. Nagios Core is an Open Source system for monitoring hosts, networks and services. Manual tuning is needed to tell MySQL to listen on other interfaces as well. you have the flexibility of sending the passive check to Nagios with a different hostname. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. i.e: service_description check http://MYIP/test.php TRUST_EXIT_CODE=0 usage () { cat <<EOF 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. Detecting and dealing with state changes is what Nagios is all about. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. These checks help ensure that the dependency logic is as accurate as possible. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Nagios server in this example is hosted on 192.168..150 and an example client is hosted on IP 192.168..200 Exit Codes To identify the status of a monitored service, Nagios runs a check nagios.cfg. 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.

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