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). 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. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. 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). If I used the first method, I have to keep separate site.pp for each environment. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! will hold the return value of commands between $( ). It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. These plugin states directly translate to service states. NPCA includes a service module that can check if a service is stopped. It is called NSCA (Nagios Service Check Acceptor). 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. 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. For example . service_description check http://MYIP/test.php 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. System Monitoring Via Nagios and SNMP - Department of Mathematics On-demand service checks are also run in parallel if needed. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. Manula's Blog: Monitoring a HTTPS URL with Nagios Monitoring Website URL Status define service{ Do not wait for whole document body to download. You know the basics on Nagios administration. check_http: command not found. Agree Can i specify what a valid response is, i.e. Does a summoned creature play immediately after being summoned by a ready action? Affordable solution to train a team and make them project ready. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? A good example of such a test is checking whether there are bad blocks on a disk. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. They have a lot of advantages and some disadvantages. 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, 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. 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. . This website is made possible by minimal ads and your gracious donation via PayPal or credit card. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . The external application writes the results of the check to the. Nagios allows applications and event handlers to send out passive check results for host objects. They may or may not work on: 44 # your system, as they must be modified for your plugins. Now that the syntax is available, TCP port 80 can be checked as follows. Add additional tags that should be sent in the HTTP header. The following screenshot shows a complete overview of all the service checks that have been configured so far. The default FQDN used for testing is www.google.com, but it can be changed as needed. Latest Insight on DNS Monitoring Tool Market Outlook 2023 to 2030 With 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 Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. 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. On-demand checks are performed as part of the predictive service dependency check logic. Nagios: monitor http service on a different port - Server Fault 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. 1. Find the plugin you want to run (if you're not sure, compare what you see in your plugins directory on your Linux box with the plugins located here: http://exchange.nagios.org/directory/Plugins, or try running "./plugin-name -h" to get the help info about the plugin). To figure this out I set nagios into debug mode with the configuration like this. After defining the command you can associate that command to a service, and then to a host. awesome. It will give you all the available options: Why is there a voltage on my HDMI and coaxial cables? Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. Now in your configuration for checks for a host you can create the following service check. can nagios adjust its check time based on the status info? Nagios - Checks and States - tutorialspoint.com Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. sudo usermod -aG docker kifarunix. There are no attachments for this article. $ check_http -H 192.168.1.50 HTTP OK HTTP/1.1 200 OK - 332 bytes in 0.004 seconds |time=0.004144s;;;0.000000 size=332B;;;0 2. b-b.mit.edu These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. Does anyone have a working example of a dependencies.cfg file for nagios? It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. This usually calls for some effort. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. 2. - specific URL support - ssl option - alternative port - fake user agent - proxy as parameter - proxy from environment variable Usage: check_website [OPTIONS] {HOSTNAME} {HOSTNAME} host to check (dns/ip) [OPTIONS]: 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. Force a check and you will see exactly how the command is being run. $ vi /usr/local/nagios/etc/servers/devserver.cfg Often, there are situations where active checks obviously fit better. To learn more, see our tips on writing great answers. # Defaults to 0, put to 1 for systemd. It can report each problem when accessing the database. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. How to configure service templates - GroundWork Support On-demand as needed for predictive service dependency checks. As mentioned earlier, server-2 has postfix mail server set up on it. ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. First, the servers are defined in Nagios. Format is minimum:maximum, Response time in seconds for warning state, Response time in seconds for critical state, Number of seconds to wait before connection times out. Install And Configure Nagios On Linux - LogicWeb Nagios will be configured to monitor SMTP and mail queue of the server. use generic-service ; Name of service template to use # SAMPLE HOST CHECK . Passive Checks and NSCA (Nagios Service Check Acceptor) ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. Learn more. Passive service checks are often used to report the results of long lasting tests asynchronously. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Ali Sabry en LinkedIn: Code-GPT is an extension for VS Code that Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Depending on the status received on hosts and services, appropriate action is taken. To figure this out I set nagios into debug mode with the configuration like this. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Set enable_notifications=0 in nagios.cfg. To check whether a specific webpage is available, use the -u option as shown below. Syntax and Options Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! 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. 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. The line should look like: Define the standard checks that you will perform on every client with NRPE. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. Follow these steps to install the plugin: Download the plugin. Check whether Apache HTTPS is running on a remote server using check_http. After installing nagios and nagios-plugins-all (via yum), I've c. This increases the security of the database. 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. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. you have the flexibility of sending the passive check to Nagios with a different hostname. The files and information on this site are the property of their respective owner(s). NRDP Overview - force.com 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. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on 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. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. The example contains partial output. The plugins can be in any language, Nagios only cares They can be the following: 0: OK Configuring a Nagios Monitoring System | Scaleway Documentation This file location depends on the configuration you've done, in my case it is in /usr/local/nagios/etc/objects/commands.cfg. No paper. Puppet nagios check disk example - United States Tutorials Step-by-step Note that all the configuration in this section is done on the client to be checked, not in the nagios server. 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. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. Manual tuning is needed to tell MySQL to listen on other interfaces as well. System Monitoring Via Nagios and SNMP< SNMP snmp is an internet protocol that allows you to retrieve management information from a remote device or to set configuration settings on a remote device. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. check_http -H hostname (or) -I ip-address {optional options}. nagiostats provides statistics of which only the part `Services Ok/Warn/Unk/Crit: 8 / 0 / 0 / 0` are interesting to us, so we are using grep to extract this line. @sunardo I just ran into this exact same thing. NSCA stands for Nagios Service Check Acceptor. Nagios Turn Off All Notifications | 6 Methods Revealed Giving material.angular.io a refresh from Angular Blog Medium. nagios-plugins/check_service.sh at master - GitHub The output indicates that it expires in 300 days. Monitoring Website URL Status Using Nagios check_http - ARKIT Yup, just like any other linux flag, the "-" with whatever flags you use will load the flag. Nagios: Simple Oracle Check - Simon Krenger Examen Nagios - Volume: 94 Questions + 7Labs Question: 1 Escalations First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). 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. Unlike active checks, Nagios will not take network topology into consideration by default. Method 2. I just used that simple script as an example, any language can be used to write your own custom plugin. Nagios understands the following exit codes: Select check_cluster from the plugin pop-up menu. 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. 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. 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. You can create a host file inside the server directory of Nagios and mention the host and service definitions. You need to add the full path to it in the check_command. Submitting Passive Check Results From Remote Hosts. This is very important in situations where a host behind a router is reported to be down because the router is actually down. See the HTML : 45 This feature is only available to subscribers. I Have problem with the check_http when I try ur command test , I have the next message : . 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. The sections below provide examples of how to perform these checks using different methods. The following file can be modified to do the job. 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. 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. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. The script should then post results to the Nagios daemon. Monitoring Windows hosts with NSClient++: Service and system checks Nagios also offers another way to work with the statuses of hosts and services. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. 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. 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. With a little tweaking, Nagios can help monitor this application port as well. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. 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. Nagios provides a sample configuration file, that we will use. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. vegan) just to try it, does this inconvenience the caterers and staff? Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. 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. 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. How to monitor common services with Nagios - Xmodulo Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Try to put full path in the command line. To do this: Navigate to Configuration > Command > New. 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. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. 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. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Configure Docker Daemon for Remote Connections - kifarunix.com great! Tanuj Bansal - Data Analyst - Kafka Service Owner and Cloudera This way, the other applications on your Nagios server can report the status of the hosts. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. How to Monitor PostgreSQL using Nagios | Severalnines 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 this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. These checks are useful when you cannot monitor hosts/services on a regular basis. So I decided to use the second method. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. Establish a terminal session to your Nagios XI server and execute the following command: When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. 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. Linux Check Service - Nagios Exchange Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Thanks for contributing an answer to Server Fault! What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 2022 Company, Inc. All rights reserved.

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