nagios service check example

The check_ncpa.py plugin enables Nagios to monitor the installed NCPAs on the hosts. 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 It can also be used by third-party applications running on different machines to send passive check results to a central Nagios server. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Nagios will ignore all check results for services that had not been configured before it was last (re)started. These checks are useful when you cannot monitor hosts/services on a regular basis. Service state changes can also trigger on-demand host checks. The host or the services will be tested again and again till the time the status is permanent. In this way, NSCA communication sent over the Internet is more secure. When services change state too frequently they are considered to be "flapping". Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. Nagios executes event handlers to handle hard states. 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. Affordable solution to train a team and make them project ready. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Yeah, it's totally brute-force, but it works for me. 28. 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 figure shown below shows an active check . http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. 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. 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. 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. They may or may not work on: 44 # your system, as they must be modified for your plugins. VS Code extension | 35 comentarios en LinkedIn The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. It is possible to configure Nagios so that it will receive status information sent over a command pipe. 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. In Nagios, 2 types of checks are performed on hosts and services . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. The best answers are voted up and rise to the top, Not the answer you're looking for? For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Base your decision on 2 verified in-depth peer reviews and ratings, pros & cons, pricing, support and more. Active checks are most common in the Nagios world. 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. 5 check_http examples Do not wait for whole document body to download. # Plugin commands (service and host check commands) # Arguments are likely to change between different . In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. rev2023.3.3.43278. Default is 10 seconds. +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. Connect and share knowledge within a single location that is structured and easy to search. . # 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. I've: 5 # provided some comments here, but things may not be so clear without further . this is more along the lines of what i meant. A good example of such a test is checking whether there are bad blocks on a disk. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. 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. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. Passive checks are performed by external processes and the results are given back to Nagios for processing. 5 check_http Command Examples 1. }. Establish a terminal session to your Nagios XI server and execute the following command: In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. They have a lot of advantages and some disadvantages. Let us see an example to perform checks on host . Unlike with active host checks, Nagios does not (by default) attempt to determine whether or host is DOWN or UNREACHABLE with passive checks. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. can anyone help me out for this problem:-, Check-Website-Response A good example would be a server that is a part of an application, processing job queues using a database. 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. It is possible to monitor machine metrics, such as disk usage, CPU use, and so on. Repeat this procedure for each Ceph plug-in applicable to the node. awesome. The check_init_service plugin does not support checking multiple services. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. Nagios also offers another way to work with the statuses of hosts and services. check_http: command not found. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). . The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Select check_cluster from the plugin pop-up menu. The following line is commented out to make MySQL listens on all interfaces. $ vi /usr/local/nagios/etc/servers/devserver.cfg For Nagios, many, many Oracle plugins are available for checking database availability and performance. The example contains partial output. Nagios dependencies.cfg example file. The following settings are done for all MySQL servers. 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. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. This task is really easy as Nagios has a built-in command for this. The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). The method for using any of these "plugins" from the command line is the same as any other Linux script: Just run "./plugin-name" with the appropriate flags you want to check, and voila! If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. 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). hello.. can nagios adjust its check time based on the status info? This will give an idea on whether the execution will be successful and what the output of the script will look like. Mar 01, 2023 (Heraldkeepers) -- United States, New Jersey- The most recent analysis of the DNS Monitoring Tool market by Infinity Business Insights offers a. - 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]: It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Nagioshttpdgccgd. (In this example, the script will print All ok and it will exit with 0, the OK . 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}. How to tell which packages are held back due to phased updates. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). All other servicemarks and trademarks are the property of their respective owner. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Are there tables of wastage rates for different fruit and veg? Nagios allows applications and event handlers to send out passive check results for host objects. Nagios.cfg is the main configuration file for your Nagios Core. 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. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. Default is HTTP/1. It says -S is for version. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Pass the specified string as User Agent in HTTP header. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. This setting will expose MySQL to all available interfaces, including WAN. If you would like to use the whole or any part of this article, you need to cite this web page at Xmodulo.com as the original source. As mentioned earlier, server-2 has postfix mail server set up on it. 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. There are no attachments for this article. These checks can provide useful insight on what is going on within the Nagios server. Learn more about Stack Overflow the company, and our products. Sometimes I find it tricky figuring out exactly what a plugin is doing. Is there a more efficient way to do this? Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. If I used the first method, I have to keep separate site.pp for each environment. To allow it to grow bigger before rotating, add more zeroes, for example. Now that the syntax is available, TCP port 80 can be checked as follows. Services are those which are used by Nagios to check something about a host. Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. A user nagios is created for both localhost and for any host. How can I get it to work with https with Nagios4 and plugins 2.x? will hold the return value of commands between $( ). No paper. vegan) just to try it, does this inconvenience the caterers and staff? Affordable solution to train a team and make them project ready. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? This means that if Nagios receives a result indicating that a host is DOWN, it assumes that all child hosts are in an UNREACHABLE state. Force a check and you will see exactly how the command is being run. In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. How to install and configure Nagios Core. Services are those which are used by Nagios to check something about a host. The following is a script that runs the dd system command (visit http://man.linuxquestions.org/index.php?query=dd) to read an entire block device. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. Now let us add check_interval directive. If you want know more, just read and play with: I'm new to shell and would like to understand and adapt your script would you comment on why this particular adaptation wont work (results unknown - 0 regardless of input parameter sent by the user), countWarnings=$(/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). NPCA includes a service module that can check if a service is stopped. So if you wanted to run the check_http check from the CLI, you would run ./check_http -I, where the I flag stands for the IP Address (, I struggled to get this to work, not sure what i was doing wrong (noob) but the debug_level trick worked for me :). Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. 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. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file 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. NPCA includes a service module that can check if a service is running. On-demand as needed for predictive service dependency checks. But if the monitoring application is not running or some other issue prevents it from reporting, Nagios can use active checks to keep the service status upto-date. After defining the command you can associate that command to a service, and then to a host. This is very important in situations where a host behind a router is reported to be down because the router is actually down. These checks help ensure that the dependency logic is as accurate as possible. 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. Next, update the remote Docker daemon DNS details on your hosts file if there is no local DNS; sudo tee -a "192.168.59.48 docker01.kifarunix.com docker01" >> /etc/hosts. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. Force a check and you will see exactly how the command is being run. levett funeral home obituaries decatur, ga, brevard county fence rules,

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