Host is just like a computer; it can be a physical device or virtual. The default FQDN used for testing is www.google.com, but it can be changed as needed. 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. Why is there a voltage on my HDMI and coaxial cables? Go to the Nagios interface via a web browser and log in as the nagiosadmin user. They may or may not work on: 44 # your system, as they must be modified for your plugins. This can be done in addition to active checks, to identify critical problems earlier. VS Code extension | 35 comentarios en LinkedIn The check_init_service plugin does not support checking multiple services. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. It only takes a minute to sign up. How can I get it to work with https with Nagios4 and plugins 2.x? Even the location of the plugins directory is in there. Force a check and you will see exactly how the command is being run. Nagios: Disable notifications from command line on Windows/Linux. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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. Check whether Apache HTTPS is running on a remote server using check_http. The plugins can be in any language, Nagios only cares They can be the following: 0: OK You might also want to give the 'capture' plugin a try. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. does the HTML display xx welcome xx? Nagios's primary mode of "service checking" is called an active check. Pass the specified string as User Agent in HTTP header. 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. Passive checks are also used when configuring distributed or redundant monitoring installations. NSClient++ includes a service module that can check if a service is running. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. 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). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. Learn more. This command accepts the host name, status code, and the textual output from a check. Is there a proper earth ground point in this switch box? Hello, ask a question, check_http detect page size, page size detection value changes again, the alarm. Note that all the configuration in this section is done on the client to be checked, not in the nagios server. this is more along the lines of what i meant. vegan) just to try it, does this inconvenience the caterers and staff? . 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. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. This website is made possible by minimal ads and your gracious donation via PayPal or credit card. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it possible to check a web page through an authenticated proxy server? Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Giving material.angular.io a refresh from Angular Blog Medium. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. And in Puppet agent, I have to define the environment (Dev, Test or Prod). For this reason, the only way to perform such a check is to schedule them from the systemfor example, using the cron daemon (visit http://man.linuxquestions.org/index.php?query=cron). 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. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. Each server runs one or more common services. Service state changes can also trigger on-demand host checks. 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. 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. 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. thank you! This can be done to gather all critical errors to a single, central place. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . This yields less output to dig through. 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. 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. Last updated on September 22, 2020 by Sarmed Rahman. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. 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. To allow it to grow bigger before rotating, add more zeroes, for example. If you preorder a special airline meal (e.g. 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. Nagios also supports a way to monitor hosts and services passively instead of actively. When Nagios daemon reads external command file, it reads and sends all the passive checks in the queue to process them later. 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. /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: It can also send reports after a database recovery, or periodically, even if connectivity to the database has been consistently available, so that Nagios has an up-to-date status. . Nagios Core and Nagios XI has a features to monitoring website URL status. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. Affordable solution to train a team and make them project ready. 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. This increases the security of the database. I am running into the same problem as David http://www.waggy.at/nagios/capture_plugin.htm, Go to your plugin directory - in my example it is, Type you plugin name - in my example it is, now run the full command - (plugin name) -H (hostname) -p (port number), However in this example port number is optional, in your config file which is look something like below (myserver.cfg) and you want to run check_cpu from command line, to check instantly (without GUI green or red), Try this - (plugin full path) - H (servername) -c (checkname). The files and information on this site are the property of their respective owner(s). NSCA stands for Nagios Service Check Acceptor. NRDP has several benefits over NSCA, including: Active checks are most common in the Nagios world. Fortra's Intermapper vs Kaseya Traverse: which is better? You can create a host file inside the server directory of Nagios and mention the host and service definitions. 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. Apply these agent configurations After the NRDP installation, install the NCPA. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Manual tuning is needed to tell MySQL to listen on other interfaces as well. 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. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. First as pending: To run a script on a remote client, you will need to set up the Nagios Remote Plugin Executor (NRPE). An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. You can create a host file inside the server directory of Nagios and mention the host and service definitions. 1. The best answers are voted up and rise to the top, Not the answer you're looking for? Services are those which are used by Nagios to check something about a host. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. For example . this is THE MOST comprehensive and straight forward turorial I've seen. When the service check has completed, the child process will inform the main Nagios process (its parent) of the check results. It has been designed to run . Test Server 1: custom application (TCP Port. Try to put full path in the command line. To figure this out I set nagios into debug mode with the configuration like this. 13. After installing nagios and nagios-plugins-all (via yum), I've c. To identify the status of a monitored service, Nagios runs a check plugin on it. # Plugin commands (service and host check commands) # Arguments are likely to change between different . The following diagram shows how both active and passive checks are performed by Nagios. To figure this out I set nagios into debug mode with the configuration like this. A good example would be a server that is a part of an application, processing job queues using a database. Examples include server load, number of concurrent processes, number of logged in users via NRPE extension. JOB, Nagios Core is an Open Source system for monitoring hosts, networks and services. More information on cached checks can be found here. Can i specify what a valid response is, i.e. 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 :). These plugin states directly translate to service states. Filters such as firewall and TCP wrappers should be used. 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. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file Submitting Passive Check Results From Remote Hosts. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. The plugin returns a CRITICAL state if the service is not started. Indicate content type in header for POST request, Regular expression can span to new line (Use this with -r or -R option), Use this regular expression to search for string in the HTTP page, If the site user basic authentication send uid, pwd in the format uid:pwd. Can I tell police to wait and call a lawyer when served with a search warrant? It can be used to send results from one Nagios instance to another. Nagios server in this example is hosted on 192.168.0.150 and an example client is hosted on IP 192.168.0.200. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Let us see an example to perform checks on host . First you should define a command in the commands.cfg file. As mentioned earlier, server-2 has postfix mail server set up on it. I've: 5 # provided some comments here, but things may not be so clear without further . Method 3. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. 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. 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. Nagios.cfg is the main configuration file for your Nagios Core. In cases where the checks require the deployment of long-running processes or monitoring information constantly, this should be done as a passive service. It will give you all the available options: 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. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. Cached checks will only provide a performance increase if you are making use of service dependencies. For example: We can also do it at a contact level, by disabling notifications . 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. /usr/lib/nagios/plugins/check_nrpe -H 3.6.123.156 -c check_root_home_du. Note that there are possible security implications of this change, so it's worth mentioning a few words: The following tuning should do the trick. @sunardo I just ran into this exact same thing. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. # Defaults to 0, put to 1 for systemd. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. In the left navigation pane, select "Process Info" and then "Disable Notifications" and "Commit.". Passive checks are performed by external processes and the results are given back to Nagios for processing. It essentially does the same thing as a debug level of 2048, but can be used on a per-plugin basis. This usually calls for some effort. You know the basics on Nagios administration. Now in your configuration for checks for a host you can create the following service check. Also, depending on your configuration you should add this last file to the main file (/usr/local/nagios/etc/nagios.cfg): Check the configuration and, if no errors or warnings, reload the service: And now you have a new custom check on a host: Nagios has a huge library of plugins available at Nagios Exchange. For any support related questions please visit the Nagios Support Forums at: Article Number: 775 | Rating: Unrated | Last Updated by. 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. I test the command from command line successfull, but when I insert in configuration file (cfg) it gives Error: Service check command check_http -H MYIP -u http://MYIP/test.php specified in service HTTP for host Server01 not defined anywhere! While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. To learn more, see our tips on writing great answers. define service{ Nagios can tell what the status of the service is by reading the exit code of the check. 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. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. We want Nagios to monitor this database, and as the application is already using it, we can add a module that reports this to Nagios. Check whether Apache HTTP is running on a remote server using check_http. 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. 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. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. check_command check_http -H MYIP -u http://MYIP/test.php This example is going to restart the crond service as it is unlikely to cause any issues. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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. Let us assume that the following custom application is also running in the network, listening on a particular port. Check whether a document is older than x seconds. Hi, this is a fantastic article, i managed to learn how to make plugins myself. mark separates the command from the arguments in the check_command entry. If you want Nagios to treat all passive check results for hosts as if they were soft results, you need to enable the following option in the main Nagios configuration file: Passive service checks are very similar to passive host checks. There would be many cases when the failures will happen randomly and they are temporary; hence Nagios uses states to check the current status of a host or service. Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. We make use of First and third party cookies to improve our user experience. Monitor whether the apache server is available. This is the main configuration file of Nagios core. This tutorial will cover the process of using some of these scripts for checking common services, such as MySQL, Apache web server, DNS, etc. Is there a more efficient way to do this? These types of checks are called Active Checks. Check WMI Plus includes a service module that can check if a service is stopped. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. 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. I've provided some comments here, but things may not be so # clear without further explanation. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. The results are passed to Nagios in the same way as they are passed for hosts. I will use a simple example. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. Nagios allows applications and event handlers to send out passive check results for host objects. Learn more. The following file can be modified to do the job. First, install the Nagios Core server. The plugin returns a CRITICAL state if the service is not started. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. The first thing that needs to be done in order to use passive checks for your Nagios setup is to make sure that you have the following options in your main Nagios configuration file: It would also be good to enable the logging of incoming passive checksthis makes determining the problem of not processing a passive check much easier. Nagios also offers a way of combining the benefits of both active and passive checks. 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. It is vital to make sure only legitimate networks have access to the database. If the situation involves reporting problems from other applications or machines, it is definitely a use case for a passive check. service_description check http://MYIP/test.php Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. 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. Would you please be so kind as to help me? For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. Save my name, email, and website in this browser for the next time I comment. Repeat this procedure for each Ceph plug-in applicable to the node. The default FQDN used for testing is www.google.com, but it can be changed as needed. A major difference between hosts and services is that service checks differentiate between soft and hard states. After defining the command you can associate that command to a service, and then to a host. 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. The __HOST__ is a special service name, which represents the host check in Nagios. It is called NSCA (Nagios Service Check Acceptor). A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). Establish a terminal session to your Nagios XI server and execute the following command: For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Services that are checked can be in one of four different states: Service checks are performed by plugins, which can return a state of OK, WARNING, UNKNOWN, or CRITICAL. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. This is a plugin for Nagios wich you can use to check if a linux service is running. Securely download your document with other editable templates, any time, with PDFfiller. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! 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. Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. Note: A service must be defined in Nagios before you can submit passive check results for it! This article assumes you have a working knowledge of Nagios. can anyone help me out for this problem:-, Check-Website-Response You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. This plugin uses systemctl is-active command, please check you have systemd.

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