nagios service check example

Are there tables of wastage rates for different fruit and veg? Nagios also offers a tool for sending passive check results for hosts and services over a network. Learn more. 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 . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. Can i specify what a valid response is, i.e. Nagios can tell what the status of the service is by reading the exit code of the check. Repeat this procedure for each Ceph plug-in applicable to the node. Also, MySQL would not let just any host to connect to it. A good example would be a server that is a part of an application, processing job queues using a database. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. Nagios Core is an Open Source system for monitoring hosts, networks and services. 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. Making statements based on opinion; back them up with references or personal experience. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. If you preorder a special airline meal (e.g. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. There are no attachments for this article. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. 1. November 2012, by Simon Krenger. 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. great! Monitor whether the apache server is available. Expected response string. Nagios.cfg is the main configuration file for your Nagios Core. They have a lot of advantages and some disadvantages. 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. The plugin returns a CRITICAL state if the service is not started. This command accepts the host name, status code, and the textual output from a check. 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. 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. Scheduled service checks are run in parallel. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. 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. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. NSCA stands for Nagios Service Check Acceptor. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. I am running into the same problem as David Host is just like a computer; it can be a physical device or virtual. When a passive result check comes in to Nagios, Nagios expects that the result already has a network topology included. 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. Filters such as firewall and TCP wrappers should be used. Each server runs one or more common services. Some of the scripts provided with Nagios are restricted to the local server only. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. 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. What is check_http? Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. I just used that simple script as an example, any language can be used to write your own custom plugin. 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. this is more along the lines of what i meant. 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). 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. I've: 5 # provided some comments here, but things may not be so clear without further . Far better then Nagios documentation. Check WMI Plus includes a service module that can check if a service is running. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Affordable solution to train a team and make them project ready. Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! Monitoring Website URL Status You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile How to use it? Does a summoned creature play immediately after being summoned by a ready action? 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. @sunardo I just ran into this exact same thing. Far better then Nagios documentation. 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. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. Detecting and dealing with state changes is what Nagios is all about. 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. The processing of active and passive check results is essentially identical. 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. 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. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. This command accepts the host name, service description, status code, and the textual output from a check. . ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. Passive service checks are often used to report the results of long lasting tests asynchronously. All other servicemarks and trademarks are the property of their respective owner. In this way, NSCA communication sent over the Internet is more secure. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. These checks can provide useful insight on what is going on within the Nagios server. To allow it to grow bigger before rotating, add more zeroes, for example. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. 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. 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. 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. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. 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. 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. Connect and share knowledge within a single location that is structured and easy to search. . http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. The provided scripts contain help on the syntax. I wrote a plugin in a bash script to check for current Warnings. NSClient++ includes a service module that can check if a service is stopped. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Syntax and Options # Defaults to 0, put to 1 for systemd. 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Nagios executes event handlers to handle hard states. 03-16-2010, 10:31 AM . 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. 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. The following line is commented out to make MySQL listens on all interfaces. This means that if Nagios receives a result indicating that a host is DOWN, it assumes that all child hosts are in an UNREACHABLE state. It is possible to configure Nagios so that it will receive status information sent over a command pipe. How can I manually run a nagios check from the command line? Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. will hold the return value of commands between $( ). Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. Start the Nagios again. 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. vegan) just to try it, does this inconvenience the caterers and staff? The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. 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). Nagios also offers another way to work with the statuses of hosts and services. How to tell which packages are held back due to phased updates. These are executed on regular intervals, as defined by check_interval and retry_interval. Here is an example set of passive checks that . To learn more, see our tips on writing great answers. 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. NPCA includes a service module that can check if a service is running. The following screenshot shows a complete overview of all the service checks that have been configured so far. A good example of such a test is checking whether there are bad blocks on a disk. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. The files and information on this site are the property of their respective owner(s). In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. After defining the command you can associate that command to a service, and then to a host. The best answers are voted up and rise to the top, Not the answer you're looking for? This is the main configuration file of Nagios core. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Active checks are most common in the Nagios world. Test Server 1: custom application (TCP Port. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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 understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. In Nagios, 2 types of checks are performed on hosts and services . First, install the Nagios Core server. hello.. In the following example, we are checking whether the website certificate expires in the next 365 days. can anyone help me out for this problem:-, Check-Website-Response Server Fault is a question and answer site for system and network administrators. Asking for help, clarification, or responding to other answers. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Is it possible to check a web page through an authenticated proxy server? Service - Started Check to see if a service is started. That is superb artile I was looking for! If you are new to the Nagios network monitoring system, see the resources at the Nagios website. More information on cached checks can be found here. 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. However, two hours after the last passive or active check result was received, Nagios would perform an active check to keep the results up-to-date. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Nagios dependencies.cfg example file. Try to put full path in the command line. +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. 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. Even the location of the plugins directory is in there. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Cached checks will only provide a performance increase if you are making use of service dependencies. For example . NPCA includes a service module that can check if a service is stopped. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. 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. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. 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. Check whether Apache HTTPS is running on a remote server using check_http. $ 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 has been designed to run . 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). 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. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. check_http: command not found. 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. notifications_enabled 0 There are also different types of checks including external applications or devices that want to report information directly to Nagios. 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, 5 check_http Command Examples 1. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . (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 am gettinr this error in nagios3. It is generally recommended to run the Nagios service check scripts in CLI before adding them to Nagios. This can be done in addition to active checks, to identify critical problems earlier. 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. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. /usr/nagios/libexec/check_http .. 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. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Save my name, email, and website in this browser for the next time I comment. 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. 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. Would you please be so kind as to help me? It will give you all the available options: 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. See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Nagioshttpdgccgd. Default is 80, This will use HTTPS using default 443 port. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. 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. 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 . 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). The default FQDN used for testing is www.google.com, but it can be changed as needed. To do this: Navigate to Configuration > Command > New. Services are those which are used by Nagios to check something about a host. 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). While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. First you should define a command in the commands.cfg file. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Do not wait for whole document body to download. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. Nagios also offers a way of combining the benefits of both active and passive checks. Pass the specified string as User Agent in HTTP header. By default you do not need to change any of the lines in this file and . Does anyone have a working example of a dependencies.cfg file for nagios? For Nagios, many, many Oracle plugins are available for checking database availability and performance. First, the servers are defined in Nagios. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. The results are passed to Nagios in the same way as they are passed for hosts. We make use of First and third party cookies to improve our user experience. Apply these agent configurations After the NRDP installation, install the NCPA. Submitting Passive Check Results From Remote Hosts. Nagios will be configured to monitor SMTP and mail queue of the server. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Minimum number of days a SSL certiface must be valid. 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. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services.

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