When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. Previous parts of this book often mentioned Nagios performing checks on various software and machines. There would be many cases when the failures will happen randomly and they are temporary; hence Nagios uses states to check the current status of a host or service. Does a summoned creature play immediately after being summoned by a ready action? Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? These checks can provide useful insight on what is going on within the Nagios server. Nagios dependencies.cfg example file. Using the definition below, checks on the host will be performed after every 3 minutes. It will give you all the available options: Far better then Nagios documentation. Check whether Apache HTTP is running on a remote server using check_http. Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. How to monitor common services with Nagios - Xmodulo If you would like to use the whole or any part of this article, you need to cite this web page at Xmodulo.com as the original source. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. 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. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Attributes can be used for both hosts and services. Passive Checks and NSCA (Nagios Service Check Acceptor) Nagios allows applications and event handlers to send out passive check results for host objects. 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. The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. The default FQDN used for testing is www.google.com, but it can be changed as needed. NPCA includes a service module that can check if a service is stopped. Affordable solution to train a team and make them project ready. Thank you for any assistance you can provide. Or you can create a custom variable to store the port number , with your example: Unlike active checks, Nagios will not take network topology into consideration by default. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. 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. check_http: command not found. How can I get it to work with https with Nagios4 and plugins 2.x? 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. 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. NPCA includes a service module that can check if a service is running. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. Check WMI Plus includes a service module that can check if a service is running. . The flexibility provided by Nagios is perfect for these case scenarios. First you should define a command in the commands.cfg file. It is called NSCA (Nagios Service Check Acceptor). 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. 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. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. Server Fault is a question and answer site for system and network administrators. Nagios ()_DevilRex119_51CTO ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. this is THE MOST comprehensive and straight forward turorial I've seen. 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. Passive Checks Documentation NCPA - Nagios Nagios: Disable notifications from command line on Windows/Linux. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. 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 -S option is not working with 2.0 plugins. Note: A host must be defined in Nagios before you can submit passive check results for it! Learn more. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. you have the flexibility of sending the passive check to Nagios with a different hostname. 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. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. $ 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. Set enable_notifications=0 in nagios.cfg. Nagios Core is an Open Source system for monitoring hosts, networks and services. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. Often, you have situations where other applications can report if a certain service is working properly or not. 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. 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. Nagios Core and Nagios XI has a features to monitoring website URL status. How to Define Nagios Timeperiod Exclude for Maintenance Window 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). 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. Nagios.cfg is the main configuration file for your Nagios Core. 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. Here is an example set of passive checks that . An external application checks the status on hosts/services and writes the result to External Command File. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. How to Write a Custom Nagios Check Plugin - HowtoForge 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. can anyone help me out for this problem:-, Check-Website-Response The plugin 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 "stopped" have an OK state). Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. 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. Are there tables of wastage rates for different fruit and veg? Here is how it can be done. These checks help ensure that the dependency logic is as accurate as possible. Would you please be so kind as to help me? The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. This feature is only available to subscribers. TRUST_EXIT_CODE=0 usage () { cat <<EOF An external application checks the status of a host or service. 13. I'd like to use the command line to run that particular check and get the output. 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. Scheduled service checks are run in parallel. 2. I've: 5 # provided some comments here, but things may not be so clear without further . @sunardo I just ran into this exact same thing. In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. 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. Service state changes can also trigger on-demand host checks. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. Passive checks are useful for monitoring services that are: Examples of asynchronous services that lend themselves to being monitored passively include SNMP traps and security alerts. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. 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. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Nagios also offers a way of combining the benefits of both active and passive checks. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. The check_init_service plugin does not support checking multiple services. 1 check_http -p 8083 - user4556274 Jul 29, 2016 at 12:49 Add a comment 3 Answers Sorted by: 3 You can specify the port number directly in the command but you will must create one command per tested port. If I used the first method, I have to keep separate site.pp for each environment. 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. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. No software installation. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Default is 80, This will use HTTPS using default 443 port. 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. The plugins can be in any language, Nagios only cares They can be the following: 0: OK The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). On-demand as needed for predictive service dependency checks. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . Each server runs one or more common services. Can i specify what a valid response is, i.e. 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. 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). +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. 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. Fortra's Intermapper vs Kaseya Traverse: which is better? 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. 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}. Passive checks are performed by external processes and the results are given back to Nagios for processing. nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. This example is going to restart the crond service as it is unlikely to cause any issues. Another difference is that active checks require much less effort to be set up when compared to passive checks. This usually calls for some effort. This will give an idea on whether the execution will be successful and what the output of the script will look like. How can I manually run a nagios check from the command line? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to use check_cluster to monitor service availability of multiple Far better then Nagios documentation. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. I am running into the same problem as David /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. Expected response string. Giving material.angular.io a refresh from Angular Blog Medium. How can I manually run a nagios check from the command line? I will use a simple example. The files and information on this site are the property of their respective owner(s). In the following example, we are checking whether the website certificate expires in the next 365 days. Here is the output when the RemoteAccess service was started: Checking if a service is stopped using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. Remotely monitor servers with the Nagios check_by_ssh plugin Host is just like a computer; it can be a physical device or virtual. 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. 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).
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