nagios service check example

Nagios executes event handlers to handle hard states. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. Here is how it can be done. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. 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. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. 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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. Hi, thanks for your comment. Service status codes are the same as those for active checks0 for OK, 1 for WARNING, 2 for CRITICAL, and 3 for an UNKNOWN state. 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 such a case, checks are done by other programs, and their results are sent to Nagios. Passive service checks are often used to report the results of long lasting tests asynchronously. Nagios can tell what the status of the service is by reading the exit code of the check. Start the Nagios again. If an application that resides on the same host as Nagios is sending passive host or service check results, it can simply write the results directly to the external command file as outlined above. Securely download your document with other editable templates, any time, with PDFfiller. On a finishing note, Nagios can monitor many other sectors of a network. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. 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. We can also do it at a contact level, by disabling notifications . (1)Nagios. # SAMPLE HOST CHECK . November 2012, by Simon Krenger. Let us assume that the following custom application is also running in the network, listening on a particular port. define service{ Is there a proper earth ground point in this switch box? Go to the Nagios interface via a web browser and log in as the nagiosadmin user. VS Code extension | 35 comentarios en LinkedIn In the following example, we are checking whether the website certificate expires in the next 365 days. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. awesome. We make use of First and third party cookies to improve our user experience. 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. 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 an earlier post, I showed how to . First you should define a command in the commands.cfg file. Services are those which are used by Nagios to check something about a host. Learn more. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. Service - Started Check to see if a service is started. 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. Select check_cluster from the plugin pop-up menu. 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. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Architect and design WAP data flow using BigData Platform. 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. 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. 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. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. This can be done to gather all critical errors to a single, central place. First, the servers are defined in Nagios. Check whether Apache HTTPS is running on a remote server using check_http. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Thank you for any assistance you can provide. 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). For those unfamiliar with Nagios, it is a monitoring system which can execute checks. There are also different types of checks including external applications or devices that want to report information directly to Nagios. 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. The documentation uses the example of: for . The plugin returns a CRITICAL state if the service is not started. Is there a more efficient way to do this? Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again. Nagioshttpdgccgd. However, if there are no jobs to process and the application is not using it, Nagios will not have up-to-date information about the database. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. It will give you all the available options: 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. How to use it? if one of my checked systems goes down, and therefore fails a PING check, I do NOT need to be notified that a file system is unavailable, or that SSH is down, too. 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. this is THE MOST comprehensive and straight forward turorial I've seen. Some methods support checking multiple services at once. Filters such as firewall and TCP wrappers should be used. 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. Get your subscription here. 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). Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Kaydolmak ve ilere teklif vermek cretsizdir. The following file can be modified to do the job. The following illustration shows how results from active and passive checks are treated differently by Nagios: In both the cases, a check result stating that the host is down is received by Nagios. 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. The following file can be modified to do the job. great! 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. Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Default is 80, This will use HTTPS using default 443 port. Nonetheless, they can be tuned to match the requirements. Copyright (c) 1999-2014 Nagios Plugin Development Team <[email protected]> This plugin tests the HTTP service on the specified host. Use Hiera. 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. More information on the flap detection logic can be found here. Agree It also defines Nagios user and group under which Nagios instance is running. How can I get it to work with https with Nagios4 and plugins 2.x? check_command check_http -H MYIP -u http://MYIP/test.php For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file More information on cached checks can be found here. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. 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. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. By default, Nagios handles results from active and passive checks differently. Far better then Nagios documentation. Attributes can be used for both hosts and services. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Unlike active checks, Nagios will not take network topology into consideration by default. 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. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! This setting is done on all MySQL servers. Another example is where an application already processes information such as network bandwidth utilization. Why is there a voltage on my HDMI and coaxial cables? Fortra's Intermapper vs Kaseya Traverse: which is better? This is a plugin for Nagios wich you can use to check if a linux service is running. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. This command accepts the host name, service description, status code, and the textual output from a check. 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. You can create a host file inside the server directory of Nagios and mention the host and service definitions. This yields less output to dig through. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. These checks are scripts and progams which take input (for example, which host to check, tresholds), do a check and then return an exit code and some performance data. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. For Nagios, many, many Oracle plugins are available for checking database availability and performance. Affordable solution to train a team and make them project ready. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. All other servicemarks and trademarks are the property of their respective owner. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Let us see an example to perform checks on host . check_http: command not found. 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. 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. 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. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . System Monitoring Via Nagios and SNMP< SNMP snmp is an internet protocol that allows you to retrieve management information from a remote device or to set configuration settings on a remote device. That is superb artile I was looking for! External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. You have entered an incorrect email address! Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. rev2023.3.3.43278. 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% Active checks can be used to "poll" a device or service for status information every so often. I will use a simple example. This article assumes you have a working knowledge of Nagios. can anyone help me out for this problem:-, Check-Website-Response The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. The plugins can be in any language, Nagios only cares They can be the following: 0: OK A major difference between hosts and services is that service checks differentiate between soft and hard states. 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. Passive checks are initiated and performed by external applications/processes, Passive check results are submitted to Nagios for processing, Asynchronous in nature and cannot be monitored effectively by polling their status on a regularly scheduled basis, Located behind a firewall and cannot be checked actively from the monitoring host. Now send a trap and see how the service appears as in Nagios XI. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. 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. Monitor whether the apache server is available. The above definitions add a host called ubuntu_host and defines the services which will run on this host. Giving material.angular.io a refresh from Angular Blog Medium. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. 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). 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. Or you can create a custom variable to store the port number , with your example: 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. These checks can provide useful insight on what is going on within the Nagios server. It's pretty simple. 2. Cached checks will only provide a performance increase if you are making use of service dependencies. sudo usermod -aG docker kifarunix. After defining the command you can associate that command to a service, and then to a host. Nagios Core is an Open Source system for monitoring hosts, networks and services. Pass the specified string as User Agent in HTTP header. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. On any device & OS. Here is an example set of passive checks that . Also, depending on your configuration you should add this last file to the main file (/usr/local/nagios/etc/nagios.cfg): Check the configuration and, if no errors or warnings, reload the service: And now you have a new custom check on a host: Nagios has a huge library of plugins available at Nagios Exchange. This task is really easy as Nagios has a built-in command for this. 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 Core and Nagios XI has a features to monitoring website URL status. If you preorder a special airline meal (e.g. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. How can I manually run a nagios check from the command line? Furthermore , Nagios can also check whether TCP port 80 (web server) is reachable e.g., the server is online but Apache/IIS is not responding. 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). Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation (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".) 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! Thanks for contributing an answer to Server Fault! It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. This command accepts the host name, status code, and the textual output from a check. Can i specify what a valid response is, i.e. Nagios check_by_ssh returns status 3 even though running the command manually works? The external application writes the results of the check to the. Passive checks are performed by external processes and the results are given back to Nagios for processing. Check whether a document is older than x seconds. In the Select resource macro: section, select USER1. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. 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. In other cases, passive checks are the way to go. 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 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. Note: A host must be defined in Nagios before you can submit passive check results for it! Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. 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. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. Asking for help, clarification, or responding to other answers. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. Expected response string. i.e: This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. The application can also periodically let Nagios know if it succeeded in using the database without problems. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. After installing nagios and nagios-plugins-all (via yum), I've c. Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Is it possible to check a web page through an authenticated proxy server? Nagios also offers another way to work with the statuses of hosts and services. Nagios: Simple Oracle Check. 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. Active checks are initiated by Nagios process and then run on a regular scheduled basis. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. Here is my configuration : This is very important in situations where a host behind a router is reported to be down because the router is actually down. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. The same queue that is used for storing results from active checks is also used to store the results from passive checks. This way, the other applications on your Nagios server can report the status of the hosts. How to tell which packages are held back due to phased updates. 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. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. Nagios will ignore all check results for services that had not been configured before it was last (re)started. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It allows to configure alerts and has different states for them. mark separates the command from the arguments in the check_command entry. 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. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. It says Unknown option specified in config file , check_http -I 10.0.0.76 -p 8192 url=/MYServiceBus/ post= eregi=.Status_Code.0./Status_Code. This plugin uses systemctl is-active command, please check you have systemd. More information on how this works can be found here. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Nagios also offers a tool for sending passive check results for hosts and services over a network. This example is going to restart the crond service as it is unlikely to cause any issues. The processing of active and passive check results is essentially identical. 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 following screenshot shows a complete overview of all the service checks that have been configured so far. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. An external application checks the status of a host or service. 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. What is check_http? You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile

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