2. 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. $ vi /usr/local/nagios/etc/servers/devserver.cfg 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. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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, Service - Started Check to see if a service is started. does the HTML display xx welcome xx? Is there a more efficient way to do this? By default, Nagios handles results from active and passive checks differently. In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. Note: A service must be defined in Nagios before you can submit passive check results for it! Learn more about Stack Overflow the company, and our products. This setting will expose MySQL to all available interfaces, including WAN. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. It has been designed to run . In an earlier post, I showed how to . You can create a host file inside the server directory of Nagios and mention the host and service definitions. 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. Nagios can be used to monitor Apache web server as well. I am running into the same problem as David 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. # 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. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. (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".) Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. First you should define a command in the commands.cfg file. 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. Apply these agent configurations After the NRDP installation, install the NCPA. You have entered an incorrect email address! Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. This article assumes you have a working knowledge of Nagios. This is very important in situations where a host behind a router is reported to be down because the router is actually down. 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. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. 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. In fact, we officially. this is more along the lines of what i meant. As this tutorial is based on Debian 9, I will show as an example how to install it, but you can find instructions for any distribution. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . We must install this software there to install the "check_nrpe" plugin that we use to perform active checks using the NRPE. awesome. When it is an active check result, Nagios takes the fact that switch1 is down into account and maps the child nodes result into an UNREACHABLE state. On-demand service checks are also run in parallel if needed. To turn on everything you want to set debug_level=4095. This allows for seamless integration of status information from external applications with Nagios. check_http: command not found. More information on the flap detection logic can be found here. We make use of First and third party cookies to improve our user experience. No paper. Method 2. When services change state too frequently they are considered to be "flapping". Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. 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. # Defaults to 0, put to 1 for systemd. These types of checks are called Active Checks. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. service_description check http://MYIP/test.php In general, if a check can be done quickly and does not require long running processes, it should definitely be done as an active service. 1. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. Copy the configuration file to the Apache directory: /usr/bin/install -c -m 644 sample-config/httpd.conf /etc/apache2/sites-available/nagios.conf Install the Nagios Plugins to have a set of tools to monitor your different services: apt install build-essential libssl-dev gcc The check_init_service plugin does not support checking multiple services. 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}. 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. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. Use Puppet environments. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Depending on the status received on hosts and services, appropriate action is taken. The output indicates that it expires in 300 days. It allows to configure alerts and has different states for them. 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. Host is just like a computer; it can be a physical device or virtual. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: 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. Note that there are possible security implications of this change, so it's worth mentioning a few words: The following tuning should do the trick. You might also want to give the 'capture' plugin a try. 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). The figure shown below shows a passive check . Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. . However, applications on remote hosts can't do this so easily. Now send a trap and see how the service appears as in Nagios XI. 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. These checks help ensure that the dependency logic is as accurate as possible. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. For example: Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. Nagios also offers a tool for sending passive check results for hosts and services over a network. It will give you all the available options: }. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Nagios Core is an Open Source system for monitoring hosts, networks and services. hello.. For Nagios, many, many Oracle plugins are available for checking database availability and performance. 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. NPCA includes a service module that can check if a service is running. Affordable solution to train a team and make them project ready. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. i.e: See the HTML : 45 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. A good example might be running a check that takes several hours to completein this case, it does not make sense to raise the global service_check_timeout option, but rather to schedule these checks outside of Nagios and only report the results back to it. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. 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). Even the location of the plugins directory is in there. This setting is done on all MySQL servers. 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. They have a lot of advantages and some disadvantages. The service check runs in a child process that was fork()ed from the main Nagios daemon. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. host_name Server01 The plugins can be in any language, Nagios only cares They can be the following: 0: OK Nagios dependencies.cfg example file. Monitoring Website URL Status can nagios adjust its check time based on the status info? 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. 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. By default you do not need to change any of the lines in this file and . Nonetheless, they can be tuned to match the requirements. Note: A host must be defined in Nagios before you can submit passive check results for it! 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. 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). rev2023.3.3.43278. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. The same queue that is used for storing results from active checks is also used to store the results from passive checks. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Primary Vendor -- Product Description Published CVSS Score Source & Patch Info; akamai -- cloudtest: Akamai CloudTest before 58.30 allows remote code execution. 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. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. 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. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. /usr/nagios/libexec/check_http .. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. 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 sections below provide examples of how to perform these checks using different methods. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. In Nagios, 2 types of checks are performed on hosts and services . Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Here is an example set of passive checks that . Default is HTTP/1. Affordable solution to train a team and make them project ready. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. It can be used to send results from one Nagios instance to another. you have the flexibility of sending the passive check to Nagios with a different hostname. By default Nagios supports URL monitoring and there is an command check_http, however if you want to monitor URL like SSL certification you can also do by extending the command options. This can be done in addition to active checks, to identify critical problems earlier. The documentation uses the example of: for . Nagios: Simple Oracle Check. 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 Nagios? 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. 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. 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. Follow these steps to install the plugin: Download the plugin. 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. On-demand as needed for predictive service dependency checks. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. Now that the syntax is available, TCP port 80 can be checked as follows. What is check_http? Learn more. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. This plugin uses systemctl is-active command, please check you have systemd. 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. 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). If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). We make use of First and third party cookies to improve our user experience. 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. In other cases, passive checks are the way to go. Complete a blank sample electronically to It also defines Nagios user and group under which Nagios instance is running. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. The following figure shows soft states and hard states. How can I make Status Information for Nagios services easier to read? This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Syntax and Options Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. As a Cloudera Administrator and Kafka service owner, leading Kafka/flume/ZK services in WAP (Multi DC Environment), Leading TICK Stack (Influxdb) and Grafana along with Administration of ELK Stack (Elasticsearch, Logstash) and Cloudera Clusters with CI/CD approach, Automation. For HTTPS running on a different port, do the following. Nagios's primary mode of "service checking" is called an active check. This usually calls for some effort. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive 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. Securely download your document with other editable templates, any time, with PDFfiller. Let us see an example to perform checks on host . This yields less output to dig through. Let us assume that the following custom application is also running in the network, listening on a particular port. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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. >Mainly Focus on Kafka and Cloudera services, Cluster . (In this example, the script will print All ok and it will exit with 0, the OK . Is it possible to check a web page through an authenticated proxy server? In this tutorial, the following three servers are being used. 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. sudo usermod -aG docker kifarunix. 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 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. NSClient++ includes a service module that can check if a service is running. This is how your host definitions look currently . Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. 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. To learn more, see our tips on writing great answers. Each server runs one or more common services. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. I am gettinr this error in nagios3. 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. 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. Does a summoned creature play immediately after being summoned by a ready action? 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. This is a plugin for Nagios wich you can use to check if a linux service is running. The following line is commented out to make MySQL listens on all interfaces. 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 . thanks! The following file can be modified to do the job. 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! These checks are useful when you cannot monitor hosts/services on a regular basis. How Nagios process handles passive check results can be defined in the main Nagios configuration file. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. On-demand checks are performed as part of the predictive service dependency check logic. 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). 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). These plugin states directly translate to service states. These types of checks are called Passive Checks. In this way, NSCA communication sent over the Internet is more secure. This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. Establish a terminal session to your Nagios XI server and execute the following command: 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. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! Select check_cluster from the plugin pop-up menu. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. 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. Up To: Contents Get your subscription here. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file NSClient++ includes a service module that can check if a service is running. Another example is where an application already processes information such as network bandwidth utilization. Check WMI Plus includes a service module that can check if a service is stopped. Force a check and you will see exactly how the command is being run. Nagios comes with a wide range of built-in scripts for monitoring services. Nagios: Disable notifications from command line on Windows/Linux. The example contains partial output. Last updated on September 22, 2020 by Sarmed Rahman. 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. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. 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. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. # SAMPLE HOST CHECK . 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. 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. Add additional tags that should be sent in the HTTP header. . Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. The flexibility provided by Nagios is perfect for these case scenarios. It is vital to make sure only legitimate networks have access to the database. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. The provided scripts contain help on the syntax. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc.
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