Syntax and Options command line output while running with -S is check_http: Invalid option SSL is not available, Next post: UNIX / Linux whatis Command Examples, Previous post: UNIX / Linux split Command Examples, Home | Linux 101 Hacks Table of Contents | Contact | Email | RSS | Copyright 20092022 Ramesh Natarajan All rights reserved | Terms of Service, host name of the server where HTTP (or HTTPS) daemon is running, Port number where HTTP server runs. 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. Detecting and dealing with state changes is what Nagios is all about. The -S option is not working with 2.0 plugins. On any device & OS. Related Commands. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! You can check whether a SSL certificate of the website expires within the next X number of days as shown below. This setting will expose MySQL to all available interfaces, including WAN. 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 . Nagios comes with a wide range of built-in scripts for monitoring services. Another difference is that active checks require much less effort to be set up when compared to passive checks. You might also want to give the 'capture' plugin a try. Use Puppet environments. Select check_cluster from the plugin pop-up menu. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. 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. You have entered an incorrect email address! 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. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. thank you! 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. How to install and configure nagios on centos 7 step by step ile ilikili ileri arayn ya da 22 milyondan fazla i ieriiyle dnyann en byk serbest alma pazarnda ie alm yapn. Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. The check logic inside Nagios process starts the Active check. This plugin uses systemctl is-active command, please check you have systemd. No paper. check_http -H hostname (or) -I ip-address {optional options}. All other servicemarks and trademarks are the property of their respective owner. To figure this out I set nagios into debug mode with the configuration like this. The sections below provide examples of how to perform these checks using different methods. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Last updated on September 22, 2020 by Sarmed Rahman. 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. 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. 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. }. The results are passed to Nagios in the same way as they are passed for hosts. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. check_command check_http -H MYIP -u http://MYIP/test.php $ vi /usr/local/nagios/etc/servers/devserver.cfg Nagios: Disable notifications from command line on Windows/Linux. The output indicates that it expires in 300 days. 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. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. NPCA includes a service module that can check if a service is stopped. The following settings are done for all MySQL servers. See the HTML : 45 In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Yeah, it's totally brute-force, but
it works for me. 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 nagios.cfg. use generic-service ; Name of service template to use @sunardo I just ran into this exact same thing. To allow it to grow bigger before rotating, add more zeroes, for example. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. How to tell which packages are held back due to phased updates. 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. 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. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. How to handle a hobby that makes income in US. 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. Test Server 1: custom application (TCP Port. 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. Nagios Core is an Open Source system for monitoring hosts, networks and services. Otherwise we must rely on parsing the # output from the service management tool. As mentioned earlier, server-2 has postfix mail server set up on it. More information on how this works can be found here. How Nagios process handles passive check results can be defined in the main Nagios configuration file. 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. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. So I decided to use the second method. The files and information on this site are the property of their respective owner(s). NRDP has several benefits over NSCA, including: If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. It allows to configure alerts and has different states for them. 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). It is called NSCA (Nagios Service Check Acceptor). The following line is commented out to make MySQL listens on all interfaces. Using the definition below, checks on the host will be performed after every 3 minutes. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Stop once the headers are downloaded. Expected response string. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. (In this example, the script will print All ok and it will exit with 0, the OK . Up To: Contents Passive checks are also used when configuring distributed or redundant monitoring installations. Is there a more efficient way to do this? For HTTPS running on a different port, do the following. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. . In an earlier post, I showed how to . Default is 80, This will use HTTPS using default 443 port. . Unlike active checks, Nagios will not take network topology into consideration by default. In order to use them, the host needs to be configured to accept passive checks results. Nagioshttpdgccgd. 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. 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. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Scheduled service checks are run in parallel. Services are those which are used by Nagios to check something about a host. To check whether a specific webpage is available, use the -u option as shown below. hello.. Active checks can be used to "poll" a device or service for status information every so often. 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. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. Once the host and services are configured on Nagios, checks are used to see if the hosts and services are working as they are supposed to or not. 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. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. Also, MySQL would not let just any host to connect to it. How can I make Status Information for Nagios services easier to read? In the Select resource macro: section, select USER1. These plugin states directly translate to service states. +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. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Monitor whether the apache server is available. Check whether Apache HTTP is running on a remote server using check_http. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. Nagios also offers a way of combining the benefits of both active and passive checks. The flexibility provided by Nagios is perfect for these case scenarios. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. Agree You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. Apply these agent configurations After the NRDP installation, install the NCPA. If I used the first method, I have to keep separate site.pp for each environment. 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. 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. 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. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. The same queue that is used for storing results from active checks is also used to store the results from passive checks. Securely download your document with other editable templates, any time, with PDFfiller. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Hi, this is a fantastic article, i managed to learn how to make plugins myself. In this tutorial, the following three servers are being used. 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. Method 2. Note: A host must be defined in Nagios before you can submit passive check results for it! Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. Now let us add check_interval directive. This example is going to restart the crond service as it is unlikely to cause any issues. So the Nagios Core version is 3.5.1. You need to add the full path to it in the check_command. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. On-demand as needed for predictive service dependency checks. Host is just like a computer; it can be a physical device or virtual. This can be done to gather all critical errors to a single, central place. 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). External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Services are those which are used by Nagios to check something about a host. Hi, thanks for your comment. Check WMI Plus includes a service module that can check if a service is stopped. 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. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. 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. Nagios will ignore all check results for services that had not been configured before it was last (re)started. 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. define service{ 5 check_http Command Examples 1. To do this: Navigate to Configuration > Command > New. 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. JOB, 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). (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. A good example would be a server that is a part of an application, processing job queues using a database. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). By default you do not need to change any of the lines in this file and . Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". These checks help ensure that the dependency logic is as accurate as possible. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. Why is there a voltage on my HDMI and coaxial cables? The line should look like: Define the standard checks that you will perform on every client with NRPE. The NRDP addon allows administrators to migrate from using NSCA to NRDP fairly easily. Here is how it can be done. Check WMI Plus includes a service module that can check if a service is running. 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! The following figure shows soft states and hard states. >Mainly Focus on Kafka and Cloudera services, Cluster . Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. More information on dependencies can be found here. 13. Is it possible to check a web page through an authenticated proxy server? NSClient++ includes a service module that can check if a service is running. Service - Started Check to see if a service is started. 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. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. These are executed on regular intervals, as defined by check_interval and retry_interval. does the HTML display xx welcome xx? check_http: command not found. Each server runs one or more common services. can nagios adjust its check time based on the status info? Viewed 12725 times since Tue, Nov 14, 2017, Viewed 18667 times since Tue, Nov 28, 2017, Viewed 70502 times since Thu, Nov 9, 2017, Viewed 9709 times since Tue, Nov 14, 2017, Viewed 12197 times since Wed, Nov 29, 2017, Viewed 47389 times since Thu, Nov 9, 2017, Viewed 14647 times since Sun, Nov 26, 2017, Viewed 42173 times since Mon, Nov 13, 2017, Viewed 18034 times since Wed, Nov 15, 2017, Viewed 22586 times since Sun, Nov 26, 2017. 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. 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. To identify the status of a monitored service, Nagios runs a check plugin on it. NSClient++ includes a service module that can check if a service is stopped. Learn more. Making statements based on opinion; back them up with references or personal experience. i.e: Here is my configuration : 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. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. 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. You know the basics on Nagios administration. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. 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. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. This is a plugin for Nagios wich you can use to check if a linux service is running. This command accepts the host name, status code, and the textual output from a check. Asking for help, clarification, or responding to other answers. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Nagios also offers another way to work with the statuses of hosts and services. Does a summoned creature play immediately after being summoned by a ready action? mark separates the command from the arguments in the check_command entry. 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. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Filters such as firewall and TCP wrappers should be used. Nagios provides a sample configuration file, that we will use. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. # 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. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. Add additional tags that should be sent in the HTTP header. For instance, a model for the file could be: The idea of having that generic file is so that you can check the same on every client. 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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