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. TRUST_EXIT_CODE=0 usage () { cat <<EOF It is called NSCA (Nagios Service Check Acceptor). NRDP has several benefits over NSCA, including: Nagios provides a sample configuration file, that we will use. Cached checks will only provide a performance increase if you are making use of service dependencies. Passive checks are also used when configuring distributed or redundant monitoring installations. 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. 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. 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. Using the definition below, checks on the host will be performed after every 3 minutes. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. This task is really easy as Nagios has a built-in command for this. In such cases, only reports regarding hard state changes are propagated across Nagios servers. 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. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. More information on dependencies can be found here. Monitor whether the apache server is available. 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). Services are those which are used by Nagios to check something about a host. How Nagios process handles passive check results can be defined in the main Nagios configuration file. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. The service check runs in a child process that was fork()ed from the main Nagios daemon. In this way, NSCA communication sent over the Internet is more secure. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. @sunardo I just ran into this exact same thing. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. Pass the specified string as User Agent in HTTP header. To do this: Navigate to Configuration > Command > New. How can I manually run a nagios check from the command line? Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. 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. In the following example, we are checking whether the website certificate expires in the next 365 days. 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. The following settings are done for all MySQL servers. 2022 Company, Inc. All rights reserved. So if you wanted to run the check_http check from the CLI, you would run ./check_http -I, where the I flag stands for the IP Address (, I struggled to get this to work, not sure what i was doing wrong (noob) but the debug_level trick worked for me :). 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. NPCA includes a service module that can check if a service is running. 5 check_http examples In the Select resource macro: section, select USER1. More information on how this works can be found here. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, Nagios also offers another way to work with the statuses of hosts and services. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. You might also want to give the 'capture' plugin a try. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. The best answers are voted up and rise to the top, Not the answer you're looking for? Check WMI Plus includes a service module that can check if a service is stopped. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Nagios can tell what the status of the service is by reading the exit code of the check. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. The plugin returns a CRITICAL state if the service is not started. 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 you have the flexibility of sending the passive check to Nagios with a different hostname. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? 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. It's pretty simple. 2. 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. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. These are executed on regular intervals, as defined by check_interval and retry_interval. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Last updated on September 22, 2020 by Sarmed Rahman. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Fortra's Intermapper vs Kaseya Traverse: which is better? Stop once the headers are downloaded. This allows for seamless integration of status information from external applications with Nagios. NPCA includes a service module that can check if a service is stopped. Nagios can check whether the server is online by running ping on the IP/name of the server as well as it can be set up to provide warnings in case the round trip time (RTT) to the server increases. There are also different types of checks including external applications or devices that want to report information directly to Nagios. 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). thanks! By default, Nagios handles results from active and passive checks differently. Otherwise we must rely on parsing the # output from the service management tool. 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. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Nagios: Simple Oracle Check. The output indicates that it expires in 300 days. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. By default you do not need to change any of the lines in this file and . This user is then granted all permission to all databases and will be used for monitoring. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. Why is there a voltage on my HDMI and coaxial cables? Nagios.cfg is the main configuration file for your Nagios Core. To keep the article focused on service monitoring, we will not be configuring hostgroups or templates, as they have been covered in the previous tutorial. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. # These are some example service check commands. 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. Here is how it can be done. I don't know if it's best practice or not , but i would declare count Warnings as an integer variable when doing arithmetic operations. This setting will expose MySQL to all available interfaces, including WAN. To turn on everything you want to set debug_level=4095. How to install and configure nagios on centos 7 step by step ile ilikili ileri arayn ya da 22 milyondan fazla i ieriiyle dnyann en byk serbest alma pazarnda ie alm yapn. The default FQDN used for testing is www.google.com, but it can be changed as needed. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. However, applications on remote hosts can't do this so easily. 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. This is a plugin for Nagios wich you can use to check if a linux service is running. 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. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Host is just like a computer; it can be a physical device or virtual. 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! Nagios's primary mode of "service checking" is called an active check. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. Default is 80, This will use HTTPS using default 443 port. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. We make use of First and third party cookies to improve our user experience. Kaydolmak ve ilere teklif vermek cretsizdir. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. 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. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. 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. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. 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. It says -S is for version. Learn more about Stack Overflow the company, and our products. 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. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Yeah, it's totally brute-force, but it works for me. can nagios adjust its check time based on the status info? First, the servers are defined in Nagios. 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. Active checks are most common in the Nagios world. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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. 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. Detecting and dealing with state changes is what Nagios is all about. 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. This can be done in addition to active checks, to identify critical problems earlier. More information on the NSCA addon can be found here. 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. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. This example is going to restart the crond service as it is unlikely to cause any issues. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. This way, the other applications on your Nagios server can report the status of the hosts. Let us assume that the following custom application is also running in the network, listening on a particular port. It has been designed to run . 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. This usually calls for some effort. check_command check_http -H MYIP -u http://MYIP/test.php Now in your configuration for checks for a host you can create the following service check. Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. To allow it to grow bigger before rotating, add more zeroes, for example. just because i had already looked in the commands.cfg file to figure out which commands were running, but i wanted to know what flags were being set. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. Nagios comes with a wide range of built-in scripts for monitoring services. Passive checks are performed by external processes and the results are given back to Nagios for processing. Nagios check_by_ssh returns status 3 even though running the command manually works? Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Check whether Apache HTTPS is running on a remote server using check_http. mark separates the command from the arguments in the check_command entry. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Related Commands. 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 . No software installation. Check whether Apache HTTP is running on a remote server using check_http. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Active checks are initiated by Nagios process and then run on a regular scheduled basis. 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. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. In order to use them, the host needs to be configured to accept passive checks results. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. It allows to configure alerts and has different states for them. 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. When a host or service is down for a very short duration of time and its status is not known or different from previous one, then soft states are used. Let us see an example to perform checks on host . In other cases, passive checks are the way to go. To identify the status of a monitored service, Nagios runs a check plugin on it. By using this website, you agree with our Cookies Policy. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. Method 2. notifications_enabled 0 In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". To check whether a specific webpage is available, use the -u option as shown below. Nagios can tell what the status of the service is by reading the exit code of the check. NSCA stands for Nagios Service Check Acceptor. If you preorder a special airline meal (e.g. The following line is commented out to make MySQL listens on all interfaces. 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. $ vi /usr/local/nagios/etc/servers/devserver.cfg Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. use generic-service ; Name of service template to use On-demand checks are performed as part of the predictive service dependency check logic. thank you! Even the location of the plugins directory is in there. Expected response string. Establish a terminal session to your Nagios XI server and execute the following command: For Nagios, many, many Oracle plugins are available for checking database availability and performance. No paper. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. UNKNOWN 2013-04-25 18:11:24 0d 0h 55m 37s 4/4 RESPONSE: UNKNOWN ERROR: /usr/bin/nc does does not exist, i am really getting frustrate from this nagios error, nitin: you need to install the netcat package for your distribution which will provide /usr/bin/nc, I had been using this plugin for a while. host_name Server01 When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. This cant be done as an active check as reading the device takes a lot of time to completelarger disks might require several hours to complete. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? The files and information on this site are the property of their respective owner(s). The first thing that needs to be done in order to use passive checks for your Nagios setup is to make sure that you have the following options in your main Nagios configuration file: It would also be good to enable the logging of incoming passive checksthis makes determining the problem of not processing a passive check much easier. Check whether a document is older than x seconds. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. Up To: Contents Nagios also offers a tool for sending passive check results for hosts and services over a network. 1. When services change state too frequently they are considered to be "flapping". 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. Are there tables of wastage rates for different fruit and veg? Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. I'd like to use the command line to run that particular check and get the output. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. The provided scripts contain help on the syntax. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. 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. Nagios will ignore all check results for services that had not been configured before it was last (re)started. How to install and configure Nagios Core. 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). The flexibility provided by Nagios is perfect for these case scenarios. As mentioned earlier, server-2 has postfix mail server set up on it. So I will add at the end of the file the following block:Advertisement.banner-1{text-align:center;padding-top:20px!important;padding-bottom:20px!important;padding-left:0!important;padding-right:0!important;background-color:#eee!important;outline:1px solid #dfdfdf;min-height:335px!important}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-banner-1','ezslot_4',111,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-banner-1-0');.banner-1{text-align:center;padding-top:20px!important;padding-bottom:20px!important;padding-left:0!important;padding-right:0!important;background-color:#eee!important;outline:1px solid #dfdfdf;min-height:335px!important}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-banner-1','ezslot_5',111,'0','1'])};__ez_fad_position('div-gpt-ad-howtoforge_com-banner-1-0_1');.banner-1-multi-111{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 object file localhost.cfg allows for parameters to be passed to check_ssh. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. The line should look like: Define the standard checks that you will perform on every client with NRPE. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. 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. The external application writes the results of the check to the. 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. . 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. JOB, You know the basics on Nagios administration. The following diagram shows how both active and passive checks are performed by Nagios. Hi, this is a fantastic article, i managed to learn how to make plugins myself. You need to add the full path to it in the check_command. hello.. . External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. rev2023.3.3.43278. 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. Repeat this procedure for each Ceph plug-in applicable to the node. Here is my configuration : 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).