nagios service check example

So I decided to use the second method. The plugins can be in any language, Nagios only cares They can be the following: 0: OK (In this example, the script will print All ok and it will exit with 0, the OK . All other servicemarks and trademarks are the property of their respective owner. To allow it to grow bigger before rotating, add more zeroes, for example. You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. Nagios executes event handlers to handle hard states. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Connect and share knowledge within a single location that is structured and easy to search. 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. Repeat this procedure for each Ceph plug-in applicable to the node. Use Puppet environments. command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. Previous parts of this book often mentioned Nagios performing checks on various software and machines. In order to be able to submit passive check results, we need to configure Nagios to allow the sending of passive check results, and set the host objects to accept them. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. Nagios: Disable notifications from command line on Windows/Linux. A good example might be running a check that takes several hours to completein this case, it does not make sense to raise the global service_check_timeout option, but rather to schedule these checks outside of Nagios and only report the results back to it. Agree The following line is commented out to make MySQL listens on all interfaces. The Nagios server is running on Ubuntu. use generic-service ; Name of service template to use service_description check http://MYIP/test.php What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. 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. The figure shown below shows an active check . /usr/nagios/libexec/check_http .. Pass the specified string as User Agent in HTTP header. This plugin uses systemctl is-active command, please check you have systemd. nagiosrpm. thanks! this is more along the lines of what i meant. You can create a host file inside the server directory of Nagios and mention the host and service definitions. How can I manually run a nagios check from the command line? In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. These checks are useful when you cannot monitor hosts/services on a regular basis. We make use of First and third party cookies to improve our user experience. NPCA includes a service module that can check if a service is running. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. Nagios also supports a way to monitor hosts and services passively instead of actively. Nagios also offers a tool for sending passive check results for hosts and services over a network. Nagios: Simple Oracle Check. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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. See the HTML : 45 It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Nagios can tell what the status of the service is by reading the exit code of the check. 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). This example is going to restart the crond service as it is unlikely to cause any issues. To turn on everything you want to set debug_level=4095. Installing the Nagios Remote Plugin Executor In this lab, we will install the Nagios Remote Plugin Executor on the Nagios Core Host as well as any remote hosts on which we haven't already installed it. This usually calls for some effort. After installing nagios and nagios-plugins-all (via yum), I've c. Nagios understands the following exit codes: When it is an active check result, Nagios takes the fact that switch1 is down into account and maps the child nodes result into an UNREACHABLE state. 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. It is possible to configure Nagios so that it will receive status information sent over a command pipe. 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. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. Here is an example set of passive checks that . (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. The plugin returns a CRITICAL state if the service is not started. vegan) just to try it, does this inconvenience the caterers and staff? . A user nagios is created for both localhost and for any host. These checks can provide useful insight on what is going on within the Nagios server. Minimum number of days a SSL certiface must be valid. 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. More information on cached checks can be found here. 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. These types of checks are called Active Checks. 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. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Are there tables of wastage rates for different fruit and veg? Passive service checks are often used to report the results of long lasting tests asynchronously. With a little tweaking, Nagios can help monitor this application port as well. When services change state too frequently they are considered to be "flapping". First, the servers are defined in Nagios. So the Nagios Core version is 3.5.1. It has been designed to run . See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. 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. When everything goes smoothly, we should be able to see our new Nagios client on the Nagios website with its new service OS: unread mail for root, as well as the status green OK. # Defaults to 0, put to 1 for systemd. It's pretty simple. Complete a blank sample electronically to Just cd (or not) into the plugins directory (this directory location varies, depending on how you've installed it, but check /usr/local/nagios, or /usr/lib/nagios). Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Remember to allow the execution of the script: if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-4','ezslot_6',110,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-4-0'); The result is a text message and an exit code: This step will be the same with your own plugins, and if you download a third-party plugin from the internet as well. The sections below provide examples of how to perform these checks using different methods. NSClient++ includes a service module that can check if a service is running. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Here is how it can be done. When Nagios plans and receives results from active checks, it takes the actual network topology into consideration and performs a translation of the states based on this. Thank you for any assistance you can provide. The -S option is not working with 2.0 plugins. - 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]: In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. We can also do it at a contact level, by disabling notifications . Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. Check WMI Plus includes a service module that can check if a service is running. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. This increases the security of the database. Detecting and dealing with state changes is what Nagios is all about. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Note: A service must be defined in Nagios before you can submit passive check results for it! The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. . Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. awesome. Hi, this is a fantastic article, i managed to learn how to make plugins myself. Even the location of the plugins directory is in there. This can be done in addition to active checks, to identify critical problems earlier. The following diagram shows how both active and passive checks are performed by Nagios. 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). Nagios will be configured to monitor SMTP and mail queue of the server. The following screenshot shows a complete overview of all the service checks that have been configured so far. 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 plugin on it. Is there a more efficient way to do this? The flexibility provided by Nagios is perfect for these case scenarios. These plugin states directly translate to service states. Would you please be so kind as to help me? Nagios comes with a wide range of built-in scripts for monitoring services. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. 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 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. Filters such as firewall and TCP wrappers should be used. 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! Check whether Apache HTTP is running on a remote server using check_http. This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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. This can be done to gather all critical errors to a single, central place. This is a plugin for Nagios wich you can use to check if a linux service is running. Once the host and services are configured on Nagios, checks are used to see if the hosts and services are working as they are supposed to or not. The output indicates that it expires in 300 days. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. 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 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). Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. This setting will expose MySQL to all available interfaces, including WAN. +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. Method 3. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Nagios provides a sample configuration file, that we will use. Save my name, email, and website in this browser for the next time I comment. Nagios also offers another way to work with the statuses of hosts and services. A major difference between hosts and services is that service checks differentiate between soft and hard states. Learn more. Let us see an example to perform checks on host . And in Puppet agent, I have to define the environment (Dev, Test or Prod). How to use it? ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. # Plugin commands (service and host check commands) # Arguments are likely to change between different . # 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) . On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. The documentation uses the example of: for . Also, MySQL would not let just any host to connect to it. 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. Active checks are initiated by Nagios process and then run on a regular scheduled basis. 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). this is THE MOST comprehensive and straight forward turorial I've seen. Nagios check_by_ssh returns status 3 even though running the command manually works? hello.. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. 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. The Nagios Service Check Acceptor (NSCA ) addon has historically been the addon of choice for Nagios administrators that need to establish data feeds or passive check transmission between Nagios installations. . Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. To figure this out I set nagios into debug mode with the configuration like this. I've: 5 # provided some comments here, but things may not be so clear without further . # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. You never know how many (if any) traps or alerts you'll receive in a given time frame, so it's not feasible to just monitor their status every few minutes. 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. Cached checks will only provide a performance increase if you are making use of service dependencies. The same queue that is used for storing results from active checks is also used to store the results from passive checks. See Also: Active Checks, Service Checks, Host Checks. Now that the syntax is available, TCP port 80 can be checked as follows. 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. Start the Nagios again. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. Hi, thanks for your comment. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. Default is 10 seconds. How to install and configure Nagios Core. 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. 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. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. On a finishing note, Nagios can monitor many other sectors of a network. If you would like to disable passive checks for just a few hosts or services, use the passive_checks_enabled directive in the host and/or service definitions to do so. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. By default, Nagios handles results from active and passive checks differently. The object file localhost.cfg allows for parameters to be passed to check_ssh. Check whether Apache HTTPS is running on a remote server using check_http. 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. The application can also periodically let Nagios know if it succeeded in using the database without problems. mark separates the command from the arguments in the check_command entry. How can I make Status Information for Nagios services easier to read? Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Hosts and service configurations are the building blocks of Nagios Core. Otherwise we must rely on parsing the # output from the service management tool. Get your subscription here. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. That is superb artile I was looking for! Nagios can be used to monitor Apache web server as well. 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. 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). The host or the services will be tested again and again till the time the status is permanent. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Some of the scripts provided with Nagios are restricted to the local server only. More information on the flap detection logic can be found here. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . 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. Monitor whether the apache server is available. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! In an earlier post, I showed how to . It is a protocol that is used in reverse of the other common Nagios protocol NRPE. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. 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. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Now send a trap and see how the service appears as in Nagios XI. It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. This is the main configuration file of Nagios core. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. Scheduled service checks are run in parallel. However, applications on remote hosts can't do this so easily. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. This means that if Nagios receives a result indicating that a host is DOWN, it assumes that all child hosts are in an UNREACHABLE state. To check whether a specific webpage is available, use the -u option as shown below. Let's consider I have the Nagios server configured to alert only on critical status, so I want an alert if I have too many services on a Warning status. NSClient++ includes a service module that can check if a service is running. can anyone help me out for this problem:-, Check-Website-Response Affordable solution to train a team and make them project ready. In this way, NSCA communication sent over the Internet is more secure. 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. Far better then Nagios documentation. 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. When Nagios checks the status of services, it will be able to detect when a service changes between OK, WARNING, UNKNOWN, and CRITICAL states and take appropriate action. 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. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Learn more about Stack Overflow the company, and our products. This command accepts the host name, status code, and the textual output from a check. This setting is done on all MySQL servers. Sometimes I find it tricky figuring out exactly what a plugin is doing. In the following example, we are checking whether the website certificate expires in the next 365 days. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. 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. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. I am running into the same problem as David It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. 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.

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