nagios service check example
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. 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. For example . In an earlier post, I showed how to . If you would like to disable passive checks for just a few hosts or services, use the passive_checks_enabled directive in the host and/or service definitions to do so. So I decided to use the second method. To turn on everything you want to set debug_level=4095. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Service status codes are the same as those for active checks0 for OK, 1 for WARNING, 2 for CRITICAL, and 3 for an UNKNOWN state. VS Code extension | 35 comentarios en LinkedIn If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. 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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. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. 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. How to use Nagios to monitor your server and services Let us assume that the following custom application is also running in the network, listening on a particular port. Is there a proper earth ground point in this switch box? 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. Use this Nagios monitoring tutorial for proactive IT monitoring nagios-plugins/check_service.sh at master - GitHub 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). On any device & OS. In the following example, we are checking whether the website certificate expires in the next 365 days. This should enable MySQL to listen on all interfaces, as well as accept incoming connections from user nagios at any host. In Nagios, 2 types of checks are performed on hosts and services . Now that the syntax is available, TCP port 80 can be checked as follows. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. (1)Nagios. Learn more. Check HTTPS Check whether Apache HTTPS is running on a remote server using check_http. Active checks reach out from the Nagios host and test if a service is doing what it's expected to do. Consider that you have put your host definitions inside host1.cfg file in /usr/local/nagios/etc/objects directory. 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. . Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. It says -S is for version. . Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. The documentation uses the example of: for . How to Write a Custom Nagios Check Plugin - HowtoForge Always remember, prior to reloading Nagios, check that there are no errors in the configuration. 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% Nagioshttpdgccgd. Otherwise we must rely on parsing the # output from the service management tool. 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. Passive Checks - Nagios 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. Nagios configuration - How to configure Nagios - GeekPeek.Net Service checks in LibreNMS (http, all other Nagios plugins) The time performed is specified in seconds. Monitoring Website URL Status Using Nagios check_http - ARKIT In order to be able to submit passive check results, we need to configure Nagios to allow the sending of passive check results, and set the host objects to accept them. Do not wait for whole document body to download. Check whether Apache HTTPS is running on a remote server using check_http. Nagios executes event handlers to handle hard states. Apply these agent configurations After the NRDP installation, install the NCPA. An example shell script of how to submit passive service check results to Nagios can be found in the documentation on volatile services. 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 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. How can I make Status Information for Nagios services easier to read? It also defines Nagios user and group under which Nagios instance is running. awesome. Fillable Online Deploying Nagios Monitoring Services on Secured Red Hat Or you can create a custom variable to store the port number , with your example: The following file can be modified to do the job. Another difference is that active checks require much less effort to be set up when compared to passive checks. First, install the Nagios Core server. If you are new to the Nagios network monitoring system, see the resources at the Nagios website. Another example is where an application already processes information such as network bandwidth utilization. To allow it to grow bigger before rotating, add more zeroes, for example. More information on the NSCA addon can be found here. Monitor DNS server with Nagios The module defines a "good" service as one that is running and a "bad" service is one that is not running, so you can define critical is when more than 0 "good" services exist. Nagios can tell what the status of the service is by reading the exit code of the check. 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. 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. They may or may not work on: 44 # your system, as they must be modified for your plugins. More information on how this works can be found here. Detecting and dealing with state changes is what Nagios is all about. Default is HTTP/1. In order to use them, the host needs to be configured to accept passive checks results. [SOLVED] Nagios dependencies.cfg example file Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? 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. Nagios vs Zabbix - What's the Difference ? (Pros and Cons) See Also: Active Checks, Host Checks, Check Scheduling, Predictive Dependency Checks. Passive checks require all the logic related to what should be reported and when it should be checked to be put in an external application. 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. These checks are useful when you cannot monitor hosts/services on a regular basis. 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. (In this example, the script will print All ok and it will exit with 0, the OK . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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! thanks! 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. Nagios Monitoring Hosts with check_ping - Stack Overflow 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. More information on the flap detection logic can be found here. 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. Monitoring Website URL Status Service Checks - Nagios Support 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. 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 increases the security of the database.
