nagios service check examplenagios service check example

The -S option is not working with 2.0 plugins. Far better then Nagios documentation. . Nagios - Checks and States - tutorialspoint.com We can also do it at a contact level, by disabling notifications . NSClient++ includes a service module that can check if a service is running. Fortra's Intermapper vs Kaseya Traverse vs Nagios XI comparison checkcommands.cfg in branches/locker-dev/noc/nagios - scripts.mit.edu I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. (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".) Restarting Linux Services with NRPE - force.com Using the definition below, checks on the host will be performed after every 3 minutes. Remember that the $USER1$ variable, is a local Nagios variable set in the resource.cfg file, in my case pointing to /usr/local/nagios/libexec. This command accepts the host name, service description, status code, and the textual output from a check. 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. 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. 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. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. 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. 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. First, the servers are defined in Nagios. 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. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Also, MySQL would not let just any host to connect to it. 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. thanks! 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. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on Passive Checks with Nagios ADMIN Magazine 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. The application can also periodically let Nagios know if it succeeded in using the database without problems. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. nagiosrpm. Nagios allows applications and event handlers to send out passive check results for host objects. In order to use them, the host needs to be configured to accept passive checks results. A sample definition for a host that runs an active check if there has been no result provided within the last two hours: The following is an illustration showing when Nagios would invoke active checks: Each time there is at least one passive check result that is still valid (i.e., was received within the past two hours), Nagios will not perform any active checks. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. On-demand as needed for predictive service dependency checks. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. The files and information on this site are the property of their respective owner(s). 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. In general, if a check can be done quickly and does not require long running processes, it should definitely be done as an active service. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. 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}. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Let us see an example to perform checks on host . This article assumes you have a working knowledge of Nagios. 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. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. 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. First, install the Nagios Core server. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. How to Write a Custom Nagios Check Plugin, /usr/local/nagios/etc/objects/commands.cfg, /usr/local/nagios/etc/objects/localhost.cfg, /usr/lib/nagios/plugins/check_users -w 5 -c 10, /usr/local/nagios/etc/objects/nrpeclient.cfg, Generic installation on Debian-based Client, Set the NRPE Check on the Server Configuration Files, Develop Network Applications for ESP8266 using Mongoose in Linux, How to Setup IKEv2 IPSec VPN Using strongSwan and Let's Encrypt on Rocky Linux 9, ISPConfig Perfect Multiserver setup on Ubuntu 20.04 and Debian 10, Generating Web Site Statistics With AWStats & JAWStats On Debian Lenny, How to Install Jitsi Video Conference Platform on Debian 11, How to Install LAMP Server Stack on Ubuntu 22.04, How to use grep to search for strings in files on the Linux shell, You have Nagios installed and running (You can follow this. It is vital to make sure only legitimate networks have access to the database. On a finishing note, Nagios can monitor many other sectors of a network. Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. Affordable solution to train a team and make them project ready. 1. It also defines Nagios user and group under which Nagios instance is running. this is THE MOST comprehensive and straight forward turorial I've seen. Perform these steps to monitor Windows Server with Nagios Core The performance of on-demand service checks can be significantly improved by implementing the use of cached checks, which allow Nagios to forgo executing a service check if it determines a relatively recent check result will do instead. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 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. 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 host or the services will be tested again and again till the time the status is permanent. A user [emailprotected] is created in MySQL server. will hold the return value of commands between $( ). When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. Learn more. When a URL is redirected, use this to either follow the URL, or send ok, warning, or critical notification, Specify the minimum and maximum page size expected in bytes. 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). The following line is commented out to make MySQL listens on all interfaces. On any device & OS. Nagios can tell what the status of the service is by reading the exit code of the check. This is a plugin for Nagios wich you can use to check if a linux service is running. First you should define a command in the commands.cfg file. These types of checks are called Passive Checks. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. Syntax and Options Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Apply these agent configurations After the NRDP installation, install the NCPA. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. NRDP has several benefits over NSCA, including: 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. This setting is done on all MySQL servers. Select check_cluster from the plugin pop-up menu. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. /usr/nagios/libexec/check_http .. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. # Plugin commands (service and host check commands) # Arguments are likely to change between different . }. Repeat this procedure for each Ceph plug-in applicable to the node. Let us assume that the following custom application is also running in the network, listening on a particular port. Depending on the status received on hosts and services, appropriate action is taken. 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. you have the flexibility of sending the passive check to Nagios with a different hostname. The documentation uses the example of: for . 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. Are there tables of wastage rates for different fruit and veg? 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. That is superb artile I was looking for! They may or may not work on: 44 # your system, as they must be modified for your plugins. Is there a more efficient way to do this? Nagios provides a sample configuration file, that we will use. (1)Nagios. How to install and configure Nagios Core. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that These types of checks are called Active Checks. Use Hiera. Services are those which are used by Nagios to check something about a host. More information on the NSCA addon can be found here. For Nagios, many, many Oracle plugins are available for checking database availability and performance. Learn more. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Note: A service must be defined in Nagios before you can submit passive check results for it! 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 using this website, you agree with our Cookies Policy. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file b-b.mit.edu The __HOST__ is a special service name, which represents the host check in Nagios. Hi, this is a fantastic article, i managed to learn how to make plugins myself. How to use Nagios to monitor your server and services 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. The Nagios server is running on Ubuntu. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. This example is going to restart the crond service as it is unlikely to cause any issues. This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. This can be done to gather all critical errors to a single, central place. Or you can create a custom variable to store the port number , with your example: Related Commands. In this way, NSCA communication sent over the Internet is more secure. 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 . Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. It's pretty simple. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? We can also configure Nagios so that if no new information has been provided within a certain period of time, it will use active checks to get the current status of the host or service. Service Checks - Nagios So the Nagios Core version is 3.5.1. 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. Monitoring Website URL Status Using Nagios check_http - ARKIT +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. 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. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. These checks can provide useful insight on what is going on within the Nagios server. 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). The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. If I used the first method, I have to keep separate site.pp for each environment. mark separates the command from the arguments in the check_command entry. Kaydolmak ve ilere teklif vermek cretsizdir. # 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. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. 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. This way, the other applications on your Nagios server can report the status of the hosts. You need to add the full path to it in the check_command. How Nagios process handles passive check results can be defined in the main Nagios configuration file. You might also want to give the 'capture' plugin a try. check_command check_http -H MYIP -u http://MYIP/test.php The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. # Defaults to 0, put to 1 for systemd. Nagios Monitoring Hosts with check_ping - Stack Overflow 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. More information on cached checks can be found here. It can be used to send results from one Nagios instance to another. VS Code extension | 35 comentarios en LinkedIn Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. 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For HTTPS running on a different port, do the following. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. How to monitor common services with Nagios - Xmodulo Does anyone have a working example of a dependencies.cfg file for nagios? A user nagios is created for both localhost and for any host. I just used that simple script as an example, any language can be used to write your own custom plugin. 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. Tanuj Bansal - Data Analyst - Kafka Service Owner and Cloudera Nagios configuration - How to configure Nagios - GeekPeek.Net Nagios can tell what the status of the service is by reading the exit code of the check. Use this Nagios monitoring tutorial for proactive IT monitoring # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Define the checks on /etc/nagios/nrpe_local.cfg. 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. Service checks in LibreNMS (http, all other Nagios plugins) # These are some example service check commands. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. 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. The following diagram shows how both active and passive checks are performed by Nagios. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. 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.
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