nagios service check example

Agree Examen Nagios - Volume: 94 Questions + 7Labs Question: 1 Escalations Host is just like a computer; it can be a physical device or virtual. To allow it to grow bigger before rotating, add more zeroes, for example. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. 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 . 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. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Nagios: Simple Oracle Check. With a little tweaking, Nagios can help monitor this application port as well. 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. 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. just because i had already looked in the commands.cfg file to figure out which commands were running, but i wanted to know what flags were being set. 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. Check whether Apache HTTP is running on a remote server using check_http. NSClient++ includes a service module that can check if a service is running. Hi, this is a fantastic article, i managed to learn how to make plugins myself. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. Configuring a Nagios Monitoring System | Scaleway Documentation Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. This is a plugin for Nagios wich you can use to check if a linux service is running. sudo usermod -aG docker kifarunix. If the remote server runs only HTTP and not HTTPS, youll get HTTP CRITICAL Unable to open TCP socket message as shown below. 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. Try to put full path in the command line. Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. 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). 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. 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 are executed on regular intervals, as defined by check_interval and retry_interval. Check whether Apache HTTPS is running on a remote server using check_http. I wrote a plugin in a bash script to check for current Warnings. We make use of First and third party cookies to improve our user experience. All other servicemarks and trademarks are the property of their respective owner. Hi, thanks for your comment. Default is HTTP/1. Installing the Nagios Remote Plugin Executor In this lab, we will install the Nagios Remote Plugin Executor on the Nagios Core Host as well as any remote hosts on which we haven't already installed it. These checks can provide useful insight on what is going on within the Nagios server. Perform these steps to monitor Windows Server with Nagios Core November 2012, by Simon Krenger. An external application checks the status of a host or service. @sunardo I just ran into this exact same thing. 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). great! 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. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. 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. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. To identify the status of a monitored service, Nagios runs a check plugin on it. 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. It looks like that with the default install, theres no configuration set up to tell Icinga where to look for the check_http executable. Here is how it can be done. These plugin states directly translate to service states. 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}. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. The following diagram shows how both active and passive checks are performed by Nagios. Nagios dependencies.cfg example file. Get your subscription here. The files and information on this site are the property of their respective owner(s). More information on the flap detection logic can be found here. 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). For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. How Nagios process handles passive check results can be defined in the main Nagios configuration file. 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. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. 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. This defines that check_nrpe is the command and check_root_home_du is the value of $ARG1$. +1 and if that seems like too much trouble you could always look at the Nagios config files to see what command and parameters need to be run. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. So the Nagios Core version is 3.5.1. How To Write Nagios Plugin - Bash Script - github.com The host or the services will be tested again and again till the time the status is permanent. Method 3. $ 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. This will give an idea on whether the execution will be successful and what the output of the script will look like. Nagios ()_DevilRex119_51CTO Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. Use Hiera. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. 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. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. Active checks are most common in the Nagios world. You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. When services change state too frequently they are considered to be "flapping". Pass the specified string as User Agent in HTTP header. External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. How to configure service templates - GroundWork Support NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. As an example of the use of this script, the command that is sent to Nagios for host01, service PING, status code 0 (OK) and output RTT=57 ms is as follows: A very common scenario for using passive checks is a check that takes a very long time to complete. NRDP Overview - force.com . The service check runs in a child process that was fork()ed from the main Nagios daemon. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Puppet nagios check disk example - United States Tutorials Step-by-step Affordable solution to train a team and make them project ready. 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. 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. 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. It is vital to make sure only legitimate networks have access to the database. How can I manually run a nagios check from the command line? # These are some example service check commands. In this tutorial, the following three servers are being used. 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% Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. There are also different types of checks including external applications or devices that want to report information directly to Nagios. How to Monitor PostgreSQL using Nagios | Severalnines # 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) . NRDP has several benefits over NSCA, including: 1. Save my name, email, and website in this browser for the next time I comment. checkcommands.cfg in noc/nagios - scripts.mit.edu The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Passive checks are performed by external processes and the results are given back to Nagios for processing. It shows what is performed by Nagios in both cases and what needs to be done by the check command or an external application for passive checks. . Latest Insight on DNS Monitoring Tool Market Outlook 2023 to 2030 With 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 This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. This is how your host definitions look currently . Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. For Nagios to perform active checks when there is no up-to-date result from passive checks, you need to set the check_freshness directive to 1 and set freshness_threshold to the time period after which a check should be performed. Another example is where an application already processes information such as network bandwidth utilization. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. can anyone help me out for this problem:-, Check-Website-Response Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. Architect and design WAP data flow using BigData Platform. Nagioshttpdgccgd. Active checks can be used to "poll" a device or service for status information every so often. I Have problem with the check_http when I try ur command test , I have the next message : Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. In the following example, we are checking whether the website certificate expires in the next 365 days. 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. The object file localhost.cfg allows for parameters to be passed to check_ssh. 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. In an earlier post, I showed how to . By default you do not need to change any of the lines in this file and . 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. 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. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. For example, if you are bringing down your HTTP server everyday sometime between midnight and 1:59 a.m, you can specify the above "247-except-night-12-2" timeperiod in your service definition for the check_period and notification_period as shown below for your particular service definition. can nagios adjust its check time based on the status info? 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. 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. 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. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. b-b.mit.edu ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. 2. 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. 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. this is more along the lines of what i meant. Far better then Nagios documentation. First you should define a command in the commands.cfg file. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. These types of checks are called Active Checks. You might also want to give the 'capture' plugin a try. 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. This increases the security of the database. 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. 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, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation 03-16-2010, 10:31 AM . Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 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. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. These types of checks are called Passive Checks. Default is 10 seconds. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Cached checks will only provide a performance increase if you are making use of service dependencies. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. 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.