Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. This task is really easy as Nagios has a built-in command for this. Here is an example set of passive checks that . 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. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Check whether Apache HTTP is running on a remote server using check_http. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. Hi, this is a fantastic article, i managed to learn how to make plugins myself. Can I tell police to wait and call a lawyer when served with a search warrant? That is superb artile I was looking for! The module defines a "good" service as one that is running and a "bad" service is one that is not running, so you can define critical is when more than 0 "good" services exist. This feature is only available to subscribers. Attributes can be used for both hosts and services. thanks! Securely download your document with other editable templates, any time, with PDFfiller. 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 is a protocol that is used in reverse of the other common Nagios protocol NRPE. Passive Checks and NSCA (Nagios Service Check Acceptor) A good example of such a test is checking whether there are bad blocks on a disk. How can I manually run a nagios check from the command line? Pass the specified string as User Agent in HTTP header. 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. Default is 80, This will use HTTPS using default 443 port. To identify the status of a monitored service, Nagios runs a check plugin on it. It allows to configure alerts and has different states for them. They are a web interface and command line tool set to work with Nagios config that have decent default templates and "example" files that you can leverage for common checks. Up To: Contents 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. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). So I decided to use the second method. 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. The Nagios server is running on Ubuntu. # SAMPLE HOST CHECK . Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Passive Checks Documentation NCPA - Nagios To use a custom script as a plugin to run remotely through NRPE, you should first write the script on the server, for instance in /usr/local/scripts/check_root_home_du.sh: The previous script is a very simple example, checking the disk usage of the directory /root and setting a threshold for considering it OK, Warning or Critical. Each server runs one or more common services. The example contains partial output. Thank you for any assistance you can provide. does the HTML display xx welcome xx? notifications_enabled 0 However, applications on remote hosts can't do this so easily. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Repeat this procedure for each Ceph plug-in applicable to the node. check_http -H hostname (or) -I ip-address {optional options}. Agree November 2012, by Simon Krenger. Check WMI Plus includes a service module that can check if a service is running. 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. 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. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? As mentioned earlier, Nagios can forgo the actual execution of an on-demand service check if it can use the cached results from a relatively recent service check. 2. Set enable_notifications=0 in nagios.cfg. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. For HTTPS running on a different port, do the following. 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. These plugin states directly translate to service states. 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. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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). 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 script should then post results to the Nagios daemon. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. 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. 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 monitor machine metrics, such as disk usage, CPU use, and so on. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. NSClient++ includes a service module that can check if a service is running. These are executed on regular intervals, as defined by check_interval and retry_interval. Define the checks on /etc/nagios/nrpe_local.cfg. The following file can be modified to do the job. 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. VS Code extension | 35 comentarios en LinkedIn There are no attachments for this article. You can check whether a SSL certificate of the website expires within the next X number of days as shown below. While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. It can report each problem when accessing the database. How to monitor common services with Nagios - Xmodulo Passive Checks with Nagios ADMIN Magazine How to tell which packages are held back due to phased updates. # Plugin commands (service and host check commands) # Arguments are likely to change between different . As mentioned earlier, server-2 has postfix mail server set up on it. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. 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. 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. can anyone help me out for this problem:-, Check-Website-Response Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Configure Docker Daemon for Remote Connections - kifarunix.com Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. Note: A host must be defined in Nagios before you can submit passive check results for it! After defining the command you can associate that command to a service, and then to a host. 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. Tanuj Bansal - Data Analyst - Kafka Service Owner and Cloudera NSClient++ includes a service module that can check if a service is stopped. The documentation uses the example of: for . NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. nagios-check-website - Nagios Exchange you have the flexibility of sending the passive check to Nagios with a different hostname. See the HTML : 45 Service status codes are the same as those for active checks0 for OK, 1 for WARNING, 2 for CRITICAL, and 3 for an UNKNOWN state. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. After installing nagios and nagios-plugins-all (via yum), I've c. To do this: Navigate to Configuration > Command > New. 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. Far better then Nagios documentation. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. If I used the first method, I have to keep separate site.pp for each environment. Agree In case you don't have the plugin in the Nagios server, you can install it with: So, summarizing, the NRPE will run a script in a remote host, and return the exit code to the Nagios server. NPCA includes a service module that can check if a service is running. One of the problems is that such checks can take only a couple of seconds to completea typical timeout for an active check to complete is 10 or 30 seconds. will hold the return value of commands between $( ). For example, you can use the 'check_http' plugin to verify that a web server is running, is returning the right text, or has an up-to-date SSL certificate. In this tutorial, the following three servers are being used. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Service state changes can also trigger on-demand host checks. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. Does anyone have a working example of a dependencies.cfg file for nagios? Active checks can be used to "poll" a device or service for status information every so often. They may or may not work on: 44 # your system, as they must be modified for your plugins. Nagios understands the following exit codes: On any device & OS. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file The files and information on this site are the property of their respective owner(s). I am running into the same problem as David mark separates the command from the arguments in the check_command entry. Also, MySQL would not let just any host to connect to it. 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. 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. The default FQDN used for testing is www.google.com, but it can be changed as needed. Stop once the headers are downloaded. host_name Server01 In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. 1. Get your subscription here. The plugins can be in any language, Nagios only cares They can be the following: 0: OK 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. How to configure service templates - GroundWork Support You need to add the full path to it in the check_command. In the first case, Nagios takes care of the scheduling, and the command only needs to perform the actual checks and mark the results as OK/WARNING/CRITICAL based on how a check command is configured. Syntax and Options Note that all the configuration in this section is done on the client to be checked, not in the nagios server. Do not wait for whole document body to download. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. The results are passed to Nagios in the same way as they are passed for hosts. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. checkcommands.cfg in branches/locker-dev/noc/nagios - scripts.mit.edu Nagios provides a sample configuration file, that we will use. /usr/nagios/libexec/check_http .. Service checks in LibreNMS (http, all other Nagios plugins) service_description check http://MYIP/test.php The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. 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. 5 check_http Command Examples 1. In such cases, only reports regarding hard state changes are propagated across Nagios servers. You can create a host file inside the server directory of Nagios and mention the host and service definitions. In the Select resource macro: section, select USER1. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Are there tables of wastage rates for different fruit and veg? Nagios also offers a way of combining the benefits of both active and passive checks. 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. Or you can create a custom variable to store the port number , with your example: This usually calls for some effort. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. By using this website, you agree with our Cookies Policy. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. The output indicates that it expires in 300 days. Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat Nagios server in this example is hosted on 192.168..150 and an example client is hosted on IP 192.168..200 Exit Codes To identify the status of a monitored service, Nagios runs a check plugin on it. We can also do it at a contact level, by disabling notifications . Nagios: Simple Oracle Check. Services are those which are used by Nagios to check something about a host. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. The provided scripts contain help on the syntax. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. To check whether a specific webpage is available, use the -u option as shown below. More information on cached checks can be found here. How to install and configure Nagios Core. Nagios check_http Plugin - Nagios Plugins 28. Otherwise we must rely on parsing the # output from the service management tool. When it comes to checking MySQL, it should be kept in mind that MySQL, by default, listens on only the loopback interface 127.0.0.1. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. A major difference between hosts and services is that service checks differentiate between soft and hard states. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. 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. I am gettinr this error in nagios3. 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 . 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.
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