While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. Now in your configuration for checks for a host you can create the following service check. Sometimes I find it tricky figuring out exactly what a plugin is doing. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. In Nagios, 2 types of checks are performed on hosts and services . The following diagram shows how both active and passive checks are performed by Nagios. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. I wouldn't leave this setting on normally though, it is very verbose and fills your log file at a rapid rate. The following figure shows soft states and hard states. 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. Up To: Contents These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. More information on how this works can be found here. Monitor whether the apache server is available. The check_init_service plugin does not support checking multiple services. I Have problem with the check_http when I try ur command test , I have the next message : From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. The next parameter specifies the number of seconds after which Nagios should consider the results to be out of date. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. NSCA stands for Nagios Service Check Acceptor. This yields less output to dig through. To do this: Navigate to Configuration > Command > New. service_description check http://MYIP/test.php The __HOST__ is a special service name, which represents the host check in Nagios. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Let's consider I have the Nagios server configured to alert only on critical status, so I want an alert if I have too many services on a Warning status. Nagios will be configured to monitor SMTP and mail queue of the server. 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. This task is really easy as Nagios has a built-in command for this. 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. Force a check and you will see exactly how the command is being run. You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. It will give you all the available options: 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. TRUST_EXIT_CODE=0 usage () { cat <<EOF Kaydolmak ve ilere teklif vermek cretsizdir. In the following example, we are checking whether the website certificate expires in the next 365 days. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. We can also do it at a contact level, by disabling notifications . 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. 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. Affordable solution to train a team and make them project ready. Thank you for any assistance you can provide. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. The example contains partial output. use generic-service ; Name of service template to use Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. >Mainly Focus on Kafka and Cloudera services, Cluster . 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. More information on cached checks can be found here. I take a slightly more brute-force direction than @Zoredache, I login to the nagios server and do "while true; do ps awwlx | grep NAGIOS_CHECK_NAME; done", while I force a re-check of the service, where NAGIOS_CHECK_NAME is either part of the check name or the IP of the server I am looking for. First you should define a command in the commands.cfg file. Learn more. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. In addition, it is run on the Linux operating system, precisely for the purpose of monitoring devices that are executed on Windows, Unix and Linux operating systems.Its main task is to constantly check key server resources, applications, networks and tasks. The flexibility provided by Nagios is perfect for these case scenarios. 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. VS Code extension | 35 comentarios en LinkedIn 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. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. 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. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. This plugin uses systemctl is-active command, please check you have systemd. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. By using this website, you agree with our Cookies Policy. 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. does the HTML display xx welcome xx? Check WMI Plus includes a service module that can check if a service is stopped. Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. These checks are useful when you cannot monitor hosts/services on a regular basis. The default FQDN used for testing is www.google.com, but it can be changed as needed. 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. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. The time performed is specified in seconds. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. The check logic inside Nagios process starts the Active check. 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. ##### # # 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. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . Related Commands. Default is 10 seconds. You know the basics on Nagios administration. This will give an idea on whether the execution will be successful and what the output of the script will look like. The service check runs in a child process that was fork()ed from the main Nagios daemon. Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. 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. 03-16-2010, 10:31 AM . How can we prove that the supernatural or paranormal doesn't exist? Define the checks on /etc/nagios/nrpe_local.cfg. 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 check_by_ssh returns status 3 even though running the command manually works? Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. 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. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. Check WMI Plus allows you to check multiple services, here is an example that checks for two services that are running. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. With a little tweaking, Nagios can help monitor this application port as well. 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. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. Set enable_notifications=0 in nagios.cfg. JOB, Once again, we are dealing with open source software, and Nagios purpose is aimed at monitoring computer systems. NSClient++ includes a service module that can check if a service is running. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Connect and share knowledge within a single location that is structured and easy to search. Expected response string. I will leave this script with all the other Nagios plugins inside /usr/local/nagios/libexec/ (This directory may be different depending on your confiugration). # 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. 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. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Using the definition below, checks on the host will be performed after every 3 minutes. The Nagios server is running on Ubuntu. How to tell which packages are held back due to phased updates. 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. Add additional tags that should be sent in the HTTP header. 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. Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again. Attributes can be used for both hosts and services.
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