Nagios dependencies.cfg example file. thank you! For example: In this tutorial, the following three servers are being used. It allows to configure alerts and has different states for them. Nagios: Disable notifications from command line on Windows/Linux. The service check runs in a child process that was fork()ed from the main Nagios daemon. This yields less output to dig through. 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. This usually calls for some effort. Nagios: Simple Oracle Check. Rather, Nagios takes the passive check result to be the actual state the host is in and doesn't try to determine the host's actual state using the reachability logic. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. hello.. All other servicemarks and trademarks are the property of their respective owner. 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. See Also: Active Checks, Service Checks, Host Checks. You can create a host file inside the server directory of Nagios and mention the host and service definitions. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. 2. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. So the Nagios Core version is 3.5.1. 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. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. 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. Up To: Contents On any device & OS. 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. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Default is 80, This will use HTTPS using default 443 port. In fact, we officially. 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. Find the plugin you want to run (if you're not sure, compare what you see in your plugins directory on your Linux box with the plugins located here: http://exchange.nagios.org/directory/Plugins, or try running "./plugin-name -h" to get the help info about the plugin). Check whether Apache HTTP is running on a remote server using check_http. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: The script should then post results to the Nagios daemon. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. You need to add the full path to it in the check_command. As mentioned earlier, Nagios can forgo the actual execution of an on-demand service check if it can use the cached results from a relatively recent service check. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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. The files and information on this site are the property of their respective owner(s). Another difference is that active checks require much less effort to be set up when compared to passive checks. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? You know the basics on Nagios administration. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. These are executed on regular intervals, as defined by check_interval and retry_interval. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. 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. The Nagios server is running on Ubuntu. 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. Nagios understands the following exit codes: Last updated on September 22, 2020 by Sarmed Rahman. These types of checks are called Passive Checks. Connect and share knowledge within a single location that is structured and easy to search. 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. Now that the syntax is available, TCP port 80 can be checked as follows. Nagios will ignore all check results for services that had not been configured before it was last (re)started. 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. Check whether Apache HTTPS is running on a remote server using check_http. 1. This can be done in addition to active checks, to identify critical problems earlier. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. 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. 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% Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. More information on dependencies can be found here. Nagios will be configured to monitor SMTP and mail queue of the server. 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}. The following line is commented out to make MySQL listens on all interfaces. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. Get your subscription here. Asking for help, clarification, or responding to other answers. 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. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. It has been designed to run . Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Monitor whether the apache server is available. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Submitting Passive Check Results From Remote Hosts. Does anyone have a working example of a dependencies.cfg file for nagios? Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. 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. Apply these agent configurations After the NRDP installation, install the NCPA. The files and information on this site are the property of their respective owner(s). The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. The following diagram shows how both active and passive checks are performed by Nagios. Nagios can tell what the status of the service is by reading the exit code of the check. This example is going to restart the crond service as it is unlikely to cause any issues. 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. We make use of First and third party cookies to improve our user experience. Save my name, email, and website in this browser for the next time I comment. define service{ VS Code extension | 35 comentarios en LinkedIn Nonetheless, they can be tuned to match the requirements. 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). Passive checks are performed by external processes and the results are given back to Nagios for processing. The following file can be modified to do the job. 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. 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. This plugin uses systemctl is-active command, please check you have systemd. On-demand as needed for predictive service dependency checks. 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. 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. Or you can create a custom variable to store the port number , with your example: check_http: command not found. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. In Nagios, 2 types of checks are performed on hosts and services . 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 . Is it possible to check a web page through an authenticated proxy server? When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Nagios Core and Nagios XI has a features to monitoring website URL status. Passive checks are also used when configuring distributed or redundant monitoring installations. 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. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . 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. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. Let us assume that the following custom application is also running in the network, listening on a particular port. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. How to Install Nagios? 13. Complete a blank sample electronically to This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Nagios's primary mode of "service checking" is called an active check. The plugin returns a CRITICAL state if the service is not started. 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). Is there a proper earth ground point in this switch box? Making statements based on opinion; back them up with references or personal experience. Can i specify what a valid response is, i.e. Minimum number of days a SSL certiface must be valid. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Related Commands. Now in your configuration for checks for a host you can create the following service check. Cached checks will only provide a performance increase if you are making use of service dependencies. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). I just used that simple script as an example, any language can be used to write your own custom plugin. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. NRDP has several benefits over NSCA, including: Often, you have situations where other applications can report if a certain service is working properly or not. 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. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file 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. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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. . 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. This article assumes you have a working knowledge of Nagios. How can I get it to work with https with Nagios4 and plugins 2.x? They have a lot of advantages and some disadvantages. I am gettinr this error in nagios3. 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. A good example would be a server that is a part of an application, processing job queues using a database. Services are those which are used by Nagios to check something about a host. Up To: Contents # Defaults to 0, put to 1 for systemd. Far better then Nagios documentation. 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. Nagios also offers a way of combining the benefits of both active and passive checks. The processing of active and passive check results is essentially identical. Otherwise we must rely on parsing the # output from the service management tool. NSClient++ includes a service module that can check if a service is running. 03-16-2010, 10:31 AM . ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. There are no attachments for this article. By default you do not need to change any of the lines in this file and . Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. 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. Is there a more efficient way to do this? Repeat this procedure for each Ceph plug-in applicable to the node. 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. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, It is possible to configure Nagios so that it will receive status information sent over a command pipe. Using the definition below, checks on the host will be performed after every 3 minutes. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Use Hiera. use generic-service ; Name of service template to use 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. After defining the command you can associate that command to a service, and then to a host. However, in a big environment it is very likely to need some custom checks for specific uses, for instance: Checking on a certain task result, monitoring an in-house developed application, among others. Yeah, it's totally brute-force, but it works for me. Would you please be so kind as to help me? You can check tomcat server, or apache server, or glassfish, or any server that is running on a different port by speficying the port number as shown below. Far better then Nagios documentation. 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. 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). This website is made possible by minimal ads and your gracious donation via PayPal or credit card. An external application checks the status of a host or service. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. $ vi /usr/local/nagios/etc/servers/devserver.cfg More information on how this works can be found here. 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. 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. $ 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. It will give you all the available options: Previous parts of this book often mentioned Nagios performing checks on various software and machines. Default is HTTP/1. Kaydolmak ve ilere teklif vermek cretsizdir. These checks are useful when you cannot monitor hosts/services on a regular basis. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Detecting and dealing with state changes is what Nagios is all about. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. Use Puppet environments. 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! The figure shown below shows an active check . # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. This setting will expose MySQL to all available interfaces, including WAN. How can I manually run a nagios check from the command line? will hold the return value of commands between $( ). 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. This is a plugin for Nagios wich you can use to check if a linux service is running. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Set enable_notifications=0 in nagios.cfg. . Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. Check WMI Plus includes a service module that can check if a service is running. Can I tell police to wait and call a lawyer when served with a search warrant? I've provided some comments here, but things may not be so # clear without further explanation. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. (In this example, the script will print All ok and it will exit with 0, the OK . First, install the Nagios Core server. Scheduled service checks are run in parallel. By default, Nagios handles results from active and passive checks differently. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. To do this: Navigate to Configuration > Command > New. I will use a simple example. 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 . . 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. Host is just like a computer; it can be a physical device or virtual. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. this is more along the lines of what i meant. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Thanks for contributing an answer to Server Fault! Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. 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, Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. 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. 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. >Mainly Focus on Kafka and Cloudera services, Cluster . Some of the scripts provided with Nagios are restricted to the local server only. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Learn more about Stack Overflow the company, and our products. The default FQDN used for testing is www.google.com, but it can be changed as needed. 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. Affordable solution to train a team and make them project ready. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. Check whether a document is older than x seconds. With a little tweaking, Nagios can help monitor this application port as well.