nagios service check example nagios service check example

The application can also periodically let Nagios know if it succeeded in using the database without problems. The script should then post results to the Nagios daemon. To turn on everything you want to set debug_level=4095. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. Agree This is the main configuration file of Nagios core. Note: A service must be defined in Nagios before you can submit passive check results for it! For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. 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. 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. Nagios also offers another way to work with the statuses of hosts and services. These types of checks are called Active Checks. can anyone help me out for this problem:-, Check-Website-Response All other servicemarks and trademarks are the property of their respective owner. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. It is vital to make sure only legitimate networks have access to the database. By default you do not need to change any of the lines in this file and . If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Get your subscription here. 1 check_http -p 8083 - user4556274 Jul 29, 2016 at 12:49 Add a comment 3 Answers Sorted by: 3 You can specify the port number directly in the command but you will must create one command per tested port. 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. rev2023.3.3.43278. Nagios.cfg is the main configuration file for your Nagios Core. # 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) . 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. 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. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. Giving material.angular.io a refresh from Angular Blog Medium. Pass the specified string as User Agent in HTTP header. NPCA includes a service module that can check if a service is running. The sections below provide examples of how to perform these checks using different methods. Would you please be so kind as to help me? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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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 The plugin returns a CRITICAL state if the service is not started. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. 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. In this way, NSCA communication sent over the Internet is more secure. 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). Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. This example is going to restart the crond service as it is unlikely to cause any issues. On-demand checks are performed as part of the predictive service dependency check logic. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. $ 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. (If I were running df -h on the linux CLI, I'm using the "h" flag - in the case of the df command, the h stands for "human readable".) They may or may not work on: 44 # your system, as they must be modified for your plugins. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. Services are those which are used by Nagios to check something about a host. 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. 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 this example, the script will print All ok and it will exit with 0, the OK . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You can create a host file inside the server directory of Nagios and mention the host and service definitions. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. Do not wait for whole document body to download. There are several different use cases covered in this KB article: The sections below provide examples of how to perform these checks using different methods. define service{ Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. 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. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. 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. 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 processing of active and passive check results is essentially identical. 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. Nagios Core and Nagios XI has a features to monitoring website URL status. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. In order to use them, the host needs to be configured to accept passive checks results. In the following example, we are checking whether the website certificate expires in the next 365 days. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. 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. 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. On-demand service checks are also run in parallel if needed. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. 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. To figure this out I set nagios into debug mode with the configuration like this. Nagios check_by_ssh returns status 3 even though running the command manually works? Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. Learn more. Here is an example set of passive checks that . 5 check_http Command Examples 1. By using this website, you agree with our Cookies Policy. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. It is called NSCA (Nagios Service Check Acceptor). What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. JOB, It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! I am running into the same problem as David 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. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Force a check and you will see exactly how the command is being run. Apply these agent configurations After the NRDP installation, install the NCPA. The figure shown below shows an active check . 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}. 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). Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Add additional tags that should be sent in the HTTP header. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. How to Install Nagios? For those unfamiliar with Nagios, it is a monitoring system which can execute checks. 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. 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. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. The files and information on this site are the property of their respective owner(s). How can I manually run a nagios check from the command line? No paper. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. There are also different types of checks including external applications or devices that want to report information directly to Nagios. Check WMI Plus includes a service module that can check if a service is stopped. 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. sudo usermod -aG docker kifarunix. 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. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. More information on the flap detection logic can be found here. Often, you have situations where other applications can report if a certain service is working properly or not. This plugin uses systemctl is-active command, please check you have systemd. These are executed on regular intervals, as defined by check_interval and retry_interval. 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 following file can be modified to do the job. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. Start the Nagios again. In other cases, passive checks are the way to go. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Learn more about Stack Overflow the company, and our products. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. can nagios adjust its check time based on the status info? Thank you for any assistance you can provide. Active checks are most common in the Nagios world. 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. We can also configure Nagios so that if no new information has been provided within a certain period of time, it will use active checks to get the current status of the host or service. Yeah, it's totally brute-force, but it works for me. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. First you should define a command in the commands.cfg file. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. 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 default FQDN used for testing is www.google.com, but it can be changed as needed. +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . Another difference is that active checks require much less effort to be set up when compared to passive checks. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Check whether a document is older than x seconds. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. Expected response string. The documentation uses the example of: for . Passive checks are also used when configuring distributed or redundant monitoring installations. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Nagios understands the following exit codes: Is it possible to check a web page through an authenticated proxy server? 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. 28. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. We make use of First and third party cookies to improve our user experience. 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. Active checks are initiated by Nagios process and then run on a regular scheduled basis. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. In such a case, checks are done by other programs, and their results are sent to Nagios. This can be done in addition to active checks, to identify critical problems earlier. As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. 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. The method for using any of these "plugins" from the command line is the same as any other Linux script: Just run "./plugin-name" with the appropriate flags you want to check, and voila! The -S option is not working with 2.0 plugins. I just used that simple script as an example, any language can be used to write your own custom plugin. How to tell which packages are held back due to phased updates. Check WMI Plus includes a service module that can check if a service is running. Asking for help, clarification, or responding to other answers. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Method 2. check_command check_http -H MYIP -u http://MYIP/test.php Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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. On-demand as needed for predictive service dependency checks. Previous parts of this book often mentioned Nagios performing checks on various software and machines. Repeat this procedure for each Ceph plug-in applicable to the node. These plugin states directly translate to service states. This user is then granted all permission to all databases and will be used for monitoring. More information on cached checks can be found here. To do this: Navigate to Configuration > Command > New. Default is 10 seconds. 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. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). 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. Default is 80, This will use HTTPS using default 443 port. 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. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. I Have problem with the check_http when I try ur command test , I have the next message : The above definitions add a host called ubuntu_host and defines the services which will run on this host. 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. You can create a host file inside the server directory of Nagios and mention the host and service definitions. 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. 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. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. Last updated on September 22, 2020 by Sarmed Rahman. Hi, thanks for your comment. For Nagios to perform active checks when there is no up-to-date result from passive checks, you need to set the check_freshness directive to 1 and set freshness_threshold to the time period after which a check should be performed. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. awesome. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. 1. Select check_cluster from the plugin pop-up menu. For Nagios, many, many Oracle plugins are available for checking database availability and performance. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. So the Nagios Core version is 3.5.1. Kaydolmak ve ilere teklif vermek cretsizdir. It can be used to send results from one Nagios instance to another. Affordable solution to train a team and make them project ready. Minimum number of days a SSL certiface must be valid. More information on how this works can be found here. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Architect and design WAP data flow using BigData Platform. They are a web interface and command line tool set to work with Nagios config that have decent default templates and "example" files that you can leverage for common checks. The module can only check if the service is started, you could however use the negate plugin to invert the returned result from the plugin (hence making CRITICAL an OK state). I've provided some comments here, but things may not be so # clear without further explanation.