nagios service check example
Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Why is there a voltage on my HDMI and coaxial cables? mark separates the command from the arguments in the check_command entry. 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. In the following example, we are checking whether the website certificate expires in the next 365 days. To figure this out I set nagios into debug mode with the configuration like this. After defining the command you can associate that command to a service, and then to a host. Repeat this procedure for each Ceph plug-in applicable to the node. In such a case, checks are done by other programs, and their results are sent to Nagios. I Have problem with the check_http when I try ur command test , I have the next message : Nagios.cfg is the main configuration file for your Nagios Core. Nonetheless, they can be tuned to match the requirements. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. NSClient++ includes a service module that can check if a service is running. Last updated on September 22, 2020 by Sarmed Rahman. NSClient++ includes a service module that can check if a service is running. Stop once the headers are downloaded. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. thank you! # 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. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. 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. Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. 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. When services change state too frequently they are considered to be "flapping". 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. This way, the other applications on your Nagios server can report the status of the hosts. Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat Vulnerability Summary for the Week of June 17, 2019 | CISA NRDP has several benefits over NSCA, including: Checking NRPE Status In Linux: A Guide To Troubleshooting Issues With For example, you can use the 'check_http' plugin to verify that a web server is running, is returning the right text, or has an up-to-date SSL certificate. The plugins can be in any language, Nagios only cares They can be the following: 0: OK 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. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. 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, 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. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. How to Monitor PostgreSQL using Nagios | Severalnines Note that all the configuration in this section is done on the client to be checked, not in the nagios server. In order to make Nagios treat passive host check results in the same way as active check results, we need to enable the following option: By default, Nagios treats host results from passive checks as hard results. Securely download your document with other editable templates, any time, with PDFfiller. It is called NSCA (Nagios Service Check Acceptor). Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. busy-beaver.mit.edu Tanuj Bansal - Data Analyst - Kafka Service Owner and Cloudera These types of checks are called Passive Checks. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. The above definitions add a host called ubuntu_host and defines the services which will run on this host. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Try to put full path in the command line. For instance, a model for the file could be: The idea of having that generic file is so that you can check the same on every client. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. I'd like to use the command line to run that particular check and get the output. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. Nagios also offers a way of combining the benefits of both active and passive checks. 13. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Is there a proper earth ground point in this switch box? To do this: Navigate to Configuration > Command > New. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. 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. Affordable solution to train a team and make them project ready. On any device & OS. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. If you preorder a special airline meal (e.g. 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. Nagios will ignore all check results for services that had not been configured before it was last (re)started. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. The plugin returns a CRITICAL state if the service is not started. An external application checks the status of a host or service. 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. On a finishing note, Nagios can monitor many other sectors of a network. Passive checks are performed by external processes and the results are given back to Nagios for processing. Establish a terminal session to your Nagios XI server and execute the following command: 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. These are executed on regular intervals, as defined by check_interval and retry_interval. /usr/nagios/libexec/check_http .. Passive Checks and NSCA (Nagios Service Check Acceptor) 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. 5 Nagios check_http Plugin Examples for HTTP / HTTPS ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . Use Puppet environments. 2. Latest Insight on DNS Monitoring Tool Market Outlook 2023 to 2030 With Nagios dependencies.cfg example file. When new information regarding a service gets passed to Nagios via the external commands pipe, Nagios treats it the same way as if it had been received by an active check. $ 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. How to Write a Custom Nagios Check Plugin - HowtoForge Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. I wrote a plugin in a bash script to check for current Warnings. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. 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. Service Checks - Nagios Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. Nagios Turn Off All Notifications | 6 Methods Revealed Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. will hold the return value of commands between $( ). In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. This user is then granted all permission to all databases and will be used for monitoring. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. 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. 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. Use this Nagios monitoring tutorial for proactive IT monitoring The figure shown below shows a passive check . How To Write Nagios Plugin - Bash Script - github.com 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 . Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. Nagios check_by_ssh returns status 3 even though running the command manually works? The same queue that is used for storing results from active checks is also used to store the results from passive checks. To allow it to grow bigger before rotating, add more zeroes, for example. This feature is only available to subscribers. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. Agree Up To: Contents Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. The plugin returns a CRITICAL state if the service is not started. All other servicemarks and trademarks are the property of their respective owner. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that However, applications on remote hosts can't do this so easily. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 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. It has been designed to run . A major difference between hosts and services is that service checks differentiate between soft and hard states. Go to the /usr/local/nagios/libexec dir (assuming you have installed nagios from source, if you have used a package from your distribution, check the docs of your package): $ cd /usr/local/nagios/libexec execute the check_dns plugin with the --help switch. 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. First, install the Nagios Core server. How can we prove that the supernatural or paranormal doesn't exist? More information on the NSCA addon can be found here. Giving material.angular.io a refresh from Angular Blog Medium. The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. The example contains partial output. Service checks in LibreNMS (http, all other Nagios plugins) 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. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Default is HTTP/1. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. this is more along the lines of what i meant. Syntax and Options thanks! Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Method 2. # SAMPLE HOST CHECK . The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. check_http: command not found. 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. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. This command accepts the host name, service description, status code, and the textual output from a check. Set enable_notifications=0 in nagios.cfg. # Defaults to 0, put to 1 for systemd. The plugin 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 "stopped" have an OK state). 5 check_http examples It is vital to make sure only legitimate networks have access to the database. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. Let us assume that the following custom application is also running in the network, listening on a particular port. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Some methods support checking multiple services at once. The service check runs in a child process that was fork()ed from the main Nagios daemon. For example, to set up a very similar service, all we need to do is to use the same parameters as those for the hosts: In this case, Nagios will never perform any active checks on its own and will only rely on the results that are passed to it. Filters such as firewall and TCP wrappers should be used. How can I make Status Information for Nagios services easier to read? The default FQDN used for testing is www.google.com, but it can be changed as needed. 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. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. I just used that simple script as an example, any language can be used to write your own custom plugin. Sometimes I find it tricky figuring out exactly what a plugin is doing. Copy the configuration file to the Apache directory: /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.conf Install the Nagios Plugins to have a set of tools to monitor your different services: apt install build-essential libssl-dev gcc The best answers are voted up and rise to the top, Not the answer you're looking for? Here is how it can be done. These plugin states directly translate to service states. Restarting Linux Services with NRPE - force.com Active checks are initiated by Nagios process and then run on a regular scheduled basis. In other cases, passive checks are the way to go. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. 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. Monitoring Windows hosts with NSClient++: Service and system checks Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Configure Docker Daemon for Remote Connections - kifarunix.com service_description check http://MYIP/test.php On the next screen: Enter a unique name in the Command Name field (suggest one is check_host_cluster and the other check_service_cluster) Append --host to the Command Line section for host . Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. In this way, NSCA communication sent over the Internet is more secure. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Format is minimum:maximum, Response time in seconds for warning state, Response time in seconds for critical state, Number of seconds to wait before connection times out. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. This yields less output to dig through. Does anyone have a working example of a dependencies.cfg file for nagios? Default is 10 seconds. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Nagioshttpdgccgd. 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. 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. This is a plugin for Nagios wich you can use to check if a linux service is running. Passive service checks are often used to report the results of long lasting tests asynchronously. This is very important in situations where a host behind a router is reported to be down because the router is actually down. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. 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. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. If you want know more, just read and play with: I'm new to shell and would like to understand and adapt your script would you comment on why this particular adaptation wont work (results unknown - 0 regardless of input parameter sent by the user), countWarnings=$(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5), echo "example: plugin.sh minimal_counter_for_warning_alert counter_for_critical_alert", if (($warn<=$countWarnings ||$countWarnings==0)); then, echo "OK - $countWarnings services in Warning state", elif (($warn<$countWarnings && $countWarnings<=$crit)); then, echo "WARNING - $countWarnings services in Warning state", echo "CRITICAL - $countWarnings services in Warning state", [emailprotected]:/usr/local/nagios/libexec$ echo $(/usr/local/nagios/bin/nagiostats | grep "Ok/Warn/Unk/Crit:" | sed 's/[[:space:]]//g' | cut -d"/" -f5). Start the Nagios again. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Now in your configuration for checks for a host you can create the following service check. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled.