nagios service check example

does the HTML display xx welcome xx? These checks are useful when you cannot monitor hosts/services on a regular basis. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. 2022 Company, Inc. All rights reserved. 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. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. 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. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. Get your subscription here. The time performed is specified in seconds. In the following example, we are checking whether the website certificate expires in the next 365 days. 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Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation 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. In order to use them, the host needs to be configured to accept passive checks results. Now let us add check_interval directive. Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: 28. No paper. The default FQDN used for testing is www.google.com, but it can be changed as needed. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. 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. Nagios also offers another way to work with the statuses of hosts and services. $ 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. Add additional tags that should be sent in the HTTP header. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. 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. NSClient++ includes a service module that can check if a service is stopped. On-demand as needed for predictive service dependency checks. 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. 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. By using this website, you agree with our Cookies Policy. 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}. When you restart the Nagios, this host will start getting monitored by Nagios and the specified services will run. The Nagios server is running on Ubuntu. The figure shown below shows an active check . 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. It can be used to send results from one Nagios instance to another. This is a plugin for Nagios wich you can use to check if a linux service is running. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. In other cases, passive checks are the way to go. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. To figure this out I set nagios into debug mode with the configuration like this. 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. It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. Can I tell police to wait and call a lawyer when served with a search warrant? An external application checks the status of a host or service. These checks can provide useful insight on what is going on within the Nagios server. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. It is possible to configure Nagios so that it will receive status information sent over a command pipe. The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . $ vi /usr/local/nagios/etc/servers/devserver.cfg How Nagios process handles passive check results can be defined in the main Nagios configuration file. To learn more, see our tips on writing great answers. Nagios comes with a wide range of built-in scripts for monitoring services. On any device & OS. Nagios allows applications and event handlers to send out passive check results for host objects. The following is a sample script that will accept the host name, status code, and output from a check and will submit these to Nagios: As an example of the use of this script, the command that is sent to Nagios for host01, status code 2 (UNREACHABLE) and output router 192.168.1.2 down would be as follows: When submitting results, it is worth noting that Nagios might take some time to process them, depending on the intervals between Nagios checks of the external command pipe. 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. As mentioned earlier, server-2 has postfix mail server set up on it. # 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) . Please refer tohttp://tldp.org/LDP/abs/html/untyped.html, hi! Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Another example is where an application already processes information such as network bandwidth utilization. I'd like to use the command line to run that particular check and get the output. this is THE MOST comprehensive and straight forward turorial I've seen. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. We want Nagios to monitor this database, and as the application is already using it, we can add a module that reports this to Nagios. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. 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. These types of checks are called Passive Checks. Use Puppet environments. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Pass the specified string as User Agent in HTTP header. 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. (1)Nagios. Sometimes I find it tricky figuring out exactly what a plugin is doing. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. I will use a simple example. The external application writes the results of the check to the. 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. rev2023.3.3.43278. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. The following diagram shows how both active and passive checks are performed by Nagios. 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. Start the Nagios again. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Thanks for contributing an answer to Server Fault! Affordable solution to train a team and make them project ready. 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. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. The following figure shows soft states and hard states. 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). Now that the syntax is available, TCP port 80 can be checked as follows. nagiosrpm. you have the flexibility of sending the passive check to Nagios with a different hostname. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. Define the checks on /etc/nagios/nrpe_local.cfg. 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% Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. Passive checks are also used when configuring distributed or redundant monitoring installations. check_http -H hostname (or) -I ip-address {optional options}. 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. Let us see an example to perform checks on host . will hold the return value of commands between $( ). The figure shown below shows a passive check . Thank you for any assistance you can provide. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. So I decided to use the second method. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. # These are some example service check commands. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. What is check_http? 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. >Mainly Focus on Kafka and Cloudera services, Cluster . ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. 5 check_http examples 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 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. 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. This can be done in addition to active checks, to identify critical problems earlier. If I used the first method, I have to keep separate site.pp for each environment. These are executed on regular intervals, as defined by check_interval and retry_interval.

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