The files and information on this site are the property of their respective owner(s). 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. The check_init_service plugin does not support checking multiple services. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. The results are passed to Nagios in the same way as they are passed for hosts. 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. i.e: For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. 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. To allow it to grow bigger before rotating, add more zeroes, for example. Also, MySQL would not let just any host to connect to it. mark separates the command from the arguments in the check_command entry. The application can also periodically let Nagios know if it succeeded in using the database without problems. If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. 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. Force a check and you will see exactly how the command is being run. To turn on everything you want to set debug_level=4095. 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. Asking for help, clarification, or responding to other answers. First, the servers are defined in Nagios. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. # 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. 5 check_http Command Examples 1. This yields less output to dig through. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Or you can create a custom variable to store the port number , with your example: Is there a more efficient way to do this? Check whether Apache HTTP is running on a remote server using check_http. Expected response string. can anyone help me out for this problem:-, Check-Website-Response Passive checks are also used when configuring distributed or redundant monitoring installations. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. The provided scripts contain help on the syntax. 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. (If I were running df -h on the linux CLI, I'm using the "h" flag - in the case of the df command, the h stands for "human readable".) Use 5 for 5 seconds, 5m for 5 minutes, 5h for 5 hours, 5d for 5 days. In order to use them, the host needs to be configured to accept passive checks results. For example . You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile 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. Check WMI Plus includes a service module that can check if a service is running. However, in a big environment it is very likely to need some custom checks for specific uses, for instance: Checking on a certain task result, monitoring an in-house developed application, among others. 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. These checks help ensure that the dependency logic is as accurate as possible. Syntax and Options 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. I will use a simple example. Complete a blank sample electronically to The plugin returns a CRITICAL state if the service is not started. And in Puppet agent, I have to define the environment (Dev, Test or Prod). thanks! Contribute to vishalsingh17/GitiPedia development by creating an account on GitHub. $ 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. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: define host { use generic-host host_name linuxbox01 address 10.0.2.1 How can I manually run a nagios check from the command line? Nagios also supports a way to monitor hosts and services passively instead of actively. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. 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. Unlike active checks, Nagios will not take network topology into consideration by default. 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. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. On the next screen: Enter a unique name in the Command Name field (suggest one is check_host_cluster and the other check_service_cluster) Append --host to the Command Line section for host . 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. Passive service checks are often used to report the results of long lasting tests asynchronously. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. Detecting and dealing with state changes is what Nagios is all about. Go to the Nagios interface via a web browser and log in as the nagiosadmin user. The flexibility provided by Nagios is perfect for these case scenarios. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. 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. Why is there a voltage on my HDMI and coaxial cables? Learn more about Stack Overflow the company, and our products. Nagios: Disable notifications from command line on Windows/Linux. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. Minimum number of days a SSL certiface must be valid. If you preorder a special airline meal (e.g. The plugin returns a CRITICAL state if the service is not started. Check whether a document is older than x seconds. The object file localhost.cfg allows for parameters to be passed to check_ssh. 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. Even the location of the plugins directory is in there. Note: A host must be defined in Nagios before you can submit passive check results for it! The above definitions add a host called ubuntu_host and defines the services which will run on this host. 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. 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. 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. The figure shown below shows a passive check . The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. Thanks for contributing an answer to Server Fault! Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. When a host is reported to be DOWN as a passive check result, Nagios does not perform a translation from DOWN to UNREACHABLE. On any device & OS. 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. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. 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 example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file The -S option is not working with 2.0 plugins. These are executed on regular intervals, as defined by check_interval and retry_interval. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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. To check whether a specific webpage is available, use the -u option as shown below. 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. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. 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. 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. First, install the Nagios Core server. Method 3. Some methods support checking multiple services at once. Often, there are situations where active checks obviously fit better. # SAMPLE HOST CHECK . How to use it? Nagios: Simple Oracle Check. Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. The Nagios server is running on Ubuntu. Nagios will be configured to monitor SMTP and mail queue of the server. More information on how this works can be found here. Monitor whether the apache server is available. Manual tuning is needed to tell MySQL to listen on other interfaces as well. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. This example is going to restart the crond service as it is unlikely to cause any issues. After installing nagios and nagios-plugins-all (via yum), I've c. 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 also offers a tool for sending passive check results for hosts and services over a network. Nagios Core and Nagios XI has a features to monitoring website URL status. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). Submitting Passive Check Results From Remote Hosts. Do not wait for whole document body to download. There are many more services in Nagios which can be used to monitor pretty much anything on the running host. Learn more. 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. To figure this out I set nagios into debug mode with the configuration like this. 5 check_http examples Fortra's Intermapper vs Kaseya Traverse: which is better? Far better then Nagios documentation. This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. 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. :), I will also menton for new users that using, The debug_levels are binary - 2048 only turns on messages from macros. Check HTTP Check whether Apache HTTP is running on a remote server using check_http. This will give an idea on whether the execution will be successful and what the output of the script will look like. Here is an example set of passive checks that . Hosts and service configurations are the building blocks of Nagios Core. See the HTML : 45 I just used that simple script as an example, any language can be used to write your own custom plugin. 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. Pass the specified string as User Agent in HTTP header. Stop once the headers are downloaded. What is check_http? Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Method 2. In fact, we officially. 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. Add additional tags that should be sent in the HTTP header. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. 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' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. These checks are useful when you cannot monitor hosts/services on a regular basis. 28. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Establish a terminal session to your Nagios XI server and execute the following command: check_command check_http -H MYIP -u http://MYIP/test.php An external application checks the status of a host or service. $ vi /usr/local/nagios/etc/servers/devserver.cfg To learn more, see our tips on writing great answers. By using this website, you agree with our Cookies Policy. vegan) just to try it, does this inconvenience the caterers and staff? Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. The default FQDN used for testing is www.google.com, but it can be changed as needed. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. How can I make Status Information for Nagios services easier to read? Here is my configuration : great! If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. First you should define a command in the commands.cfg file. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. # Plugin commands (service and host check commands) # Arguments are likely to change between different . 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. Start the Nagios again. This is the main configuration file of Nagios core. So the Nagios Core version is 3.5.1. Nagios allows applications and event handlers to send out passive check results for host objects. 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. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Define the checks on /etc/nagios/nrpe_local.cfg. 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).
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