Service - Started Check to see if a service is started. Nagios can tell what the status of the service is by reading the exit code of the check. This allows for seamless integration of status information from external applications with Nagios. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. 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. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. Passive service checks are often used to report the results of long lasting tests asynchronously. Does anyone have a working example of a dependencies.cfg file for nagios? Checking if a service is running using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. 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. Follow these steps to install the plugin: Download the plugin. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. Nagios understands the following exit codes: Nagios executes event handlers to handle hard states. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. The basic workings of service checks are described here Services are checked by the Nagios daemon: On-demand checks are performed as part of the predictive service dependency check logic. Connect and share knowledge within a single location that is structured and easy to search. Affordable solution to train a team and make them project ready. 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. Up To: Contents 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. There are also different types of checks including external applications or devices that want to report information directly to Nagios. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Try to put full path in the command line. 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% # 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) . Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. Passive checks require all the logic related to what should be reported and when it should be checked to be put in an external application. 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. Using the definition below, checks on the host will be performed after every 3 minutes. 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. Thank you for any assistance you can provide. Nagioshttpdgccgd. Apply these agent configurations After the NRDP installation, install the NCPA. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! How to tell which packages are held back due to phased updates. Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. NSClient++ includes a service module that can check if a service is running. The example contains partial output. You can check tomcat server, or apache server, or glassfish, or any server that is running on a different port by speficying the port number as shown below. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. Why is there a voltage on my HDMI and coaxial cables? To figure this out I set nagios into debug mode with the configuration like this. does the HTML display xx welcome xx? Nagios will be configured to monitor SMTP and mail queue of the server. TRUST_EXIT_CODE=0 usage () { cat <<EOF notifications_enabled 0 To figure this out I set nagios into debug mode with the configuration like this. 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! There are no attachments for this article. Affordable solution to train a team and make them project ready. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. nagiosrpm. An external application checks the status on hosts/services and writes the result to External Command File. 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. These types of checks are called Passive Checks. The default FQDN used for testing is www.google.com, but it can be changed as needed. 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. 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. host_name Server01 The results are passed to Nagios in the same way as they are passed for hosts. 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. I just used that simple script as an example, any language can be used to write your own custom plugin. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. What is check_http? ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). It is vital to make sure only legitimate networks have access to the database. But today when I am trying to post an XML message to the server, from console it works well but does not work with nrpe. Passive checks are also used when configuring distributed or redundant monitoring installations. 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. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. To identify the status of a monitored service, Nagios runs a check plugin on it. It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. Nagios.cfg is the main configuration file for your Nagios Core. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. After installing nagios and nagios-plugins-all (via yum), I've c. When everything goes smoothly, we should be able to see our new Nagios client on the Nagios website with its new service OS: unread mail for root, as well as the status green OK. Nagios Enterprises makes no claims or warranties as to the fitness of any file or information on this website, for any purpose whatsoever. Nagios will ignore all check results for services that had not been configured before it was last (re)started. 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. Fortra's Intermapper vs Kaseya Traverse: which is better? check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, These checks are useful when you cannot monitor hosts/services on a regular basis. Cached checks will only provide a performance increase if you are making use of service dependencies. 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. 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. First, install the Nagios Core server. The plugin returns a CRITICAL state if the service is not started. This will give an idea on whether the execution will be successful and what the output of the script will look like. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. # These are some example service check commands. 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. 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. See the HTML : 45 great! The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. Get your subscription here. 2. These will come through as an Unconfigured Object initially because Nagios XI has never received a Passive check result for this host/service. 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. In the following example, we are checking whether the website certificate expires in the next 365 days. This feature is only available to subscribers. I've: 5 # provided some comments here, but things may not be so clear without further . These checks are scripts and progams which take input (for example, which host to check, tresholds), do a check and then return an exit code and some performance data. Last updated on September 22, 2020 by Sarmed Rahman. This directive is used to perform scheduled checks of the hosts for the number you set; by default it is in minutes. Method 2. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. How to Write a Custom Nagios Check Plugin, /usr/local/nagios/etc/objects/commands.cfg, /usr/local/nagios/etc/objects/localhost.cfg, /usr/lib/nagios/plugins/check_users -w 5 -c 10, /usr/local/nagios/etc/objects/nrpeclient.cfg, Generic installation on Debian-based Client, Set the NRPE Check on the Server Configuration Files, Develop Network Applications for ESP8266 using Mongoose in Linux, How to Setup IKEv2 IPSec VPN Using strongSwan and Let's Encrypt on Rocky Linux 9, ISPConfig Perfect Multiserver setup on Ubuntu 20.04 and Debian 10, Generating Web Site Statistics With AWStats & JAWStats On Debian Lenny, How to Install Jitsi Video Conference Platform on Debian 11, How to Install LAMP Server Stack on Ubuntu 22.04, How to use grep to search for strings in files on the Linux shell, You have Nagios installed and running (You can follow this. 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. 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. It can be used to send results from one Nagios instance to another. Now that the syntax is available, TCP port 80 can be checked as follows. Previous parts of this book often mentioned Nagios performing checks on various software and machines. Unlike active checks, Nagios will not take network topology into consideration by default. More information on how this works can be found here. It has been designed to run . 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. Nagios dependencies.cfg example file. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? To check whether a specific webpage is available, use the -u option as shown below. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. 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). Server Fault is a question and answer site for system and network administrators. Detecting and dealing with state changes is what Nagios is all about. In order to enable passive checks in Nagios, you'll need to do the following: If you want to disable processing of passive checks on a global basis, set the accept_passive_service_checks directive to 0. I am gettinr this error in nagios3. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. 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. In the Select resource macro: section, select USER1. By default, Nagios handles results from active and passive checks differently. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. Nagios provides a sample configuration file, that we will use. Passive checks are performed by external processes and the results are given back to Nagios for processing. 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. Sometimes I find it tricky figuring out exactly what a plugin is doing. NPCA includes a service module that can check if a service is stopped. For example . Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Xmodulo 2021 About Write for Us Feed Powered by DigitalOcean, Creative Commons Attribution-ShareAlike 3.0 Unported License, Monitor whether MySQL is running by checking port, Monitor the availability of certain database. Some methods support checking multiple services at once. Submitting passive host check results to Nagios requires sending a command to the Nagios external command pipe. 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. The script should then post results to the Nagios daemon. More information on cached checks can be found here. A good example of such a test is checking whether there are bad blocks on a disk. How Nagios process handles passive check results can be defined in the main Nagios configuration file. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. Agree i.e: 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. 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. 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. Related Commands. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. 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. You can create a host file inside the server directory of Nagios and mention the host and service definitions. NSCA stands for Nagios Service Check Acceptor. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. It is called NSCA (Nagios Service Check Acceptor). I'd like to use the command line to run that particular check and get the output. 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. This usually calls for some effort. Nagios also offers another way to work with the statuses of hosts and services. 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). 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. All of the scripts are located at /etc/nagios-plugins/config/ with the executable files stored at /usr/lib/nagios/plugins/. Nonetheless, they can be tuned to match the requirements. 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. You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Architect and design WAP data flow using BigData Platform. can nagios adjust its check time based on the status info? Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. And in Puppet agent, I have to define the environment (Dev, Test or Prod). The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. Are there tables of wastage rates for different fruit and veg? will hold the return value of commands between $( ). Or you can create a custom variable to store the port number , with your example: So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Host is just like a computer; it can be a physical device or virtual. Is it possible to check a web page through an authenticated proxy server? Hosts and service configurations are the building blocks of Nagios Core. 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}. 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. 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. 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. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. The plugins can be in any language, Nagios only cares They can be the following: 0: OK The time performed is specified in seconds. So the Nagios Core version is 3.5.1. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. Checking a service using SNMP is not very straight forward, checking a process is the best solution here, please refer to the Process Checks KB article. 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. Otherwise we must rely on parsing the # output from the service management tool. check_command check_http -H MYIP -u http://MYIP/test.php Go to the Nagios interface via a web browser and log in as the nagiosadmin user. 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. From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. 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. . 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). debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. How can I make Status Information for Nagios services easier to read? Start the Nagios again. Expected response string. thank you! 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. 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. How can we prove that the supernatural or paranormal doesn't exist? 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. A good example would be a server that is a part of an application, processing job queues using a database. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. All other servicemarks and trademarks are the property of their respective owner. These plugin states directly translate to service states. This can be done in addition to active checks, to identify critical problems earlier. Now let us add check_interval directive. This user is then granted all permission to all databases and will be used for monitoring. The Nagios Service Check Acceptor (NSCA ) addon has historically been the addon of choice for Nagios administrators that need to establish data feeds or passive check transmission between Nagios installations. NRDP has several benefits over NSCA, including: These checks help ensure that the dependency logic is as accurate as possible. On the client host that you want to use to connect to remote Docker daemon, generate SSH keys from your user account; ssh-keygen. The check logic inside Nagios process starts the Active check. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. In this way, NSCA communication sent over the Internet is more secure. How to use it? The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Even the location of the plugins directory is in there. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . NPCA includes a service module that can check if a service is running. You know the basics on Nagios administration. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. 13. How to install and configure Nagios Core. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Also, depending on your configuration you should add this last file to the main file (/usr/local/nagios/etc/nagios.cfg): Check the configuration and, if no errors or warnings, reload the service: And now you have a new custom check on a host: Nagios has a huge library of plugins available at Nagios Exchange. By using this website, you agree with our Cookies Policy. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. 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. 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. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on.
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