nagios service check example

Securely download your document with other editable templates, any time, with PDFfiller. Passive checks are also used when configuring distributed or redundant monitoring installations. And in Puppet agent, I have to define the environment (Dev, Test or Prod). Another difference is that active checks require much less effort to be set up when compared to passive checks. . Note: A service must be defined in Nagios before you can submit passive check results for it! 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. Architect and design WAP data flow using BigData Platform. The figure shown below shows a passive check . Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? A major difference between hosts and services is that service checks differentiate between soft and hard states. 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. The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Check whether Apache HTTP is running on a remote server using check_http. Nagios SNMP checks - The Noc Cave NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Nagios XI - SNMP Trap Tutorial - Nagios Support The performance of on-demand service checks can be significantly improved by implementing the use of cached checks, which allow Nagios to forgo executing a service check if it determines a relatively recent check result will do instead. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. NSCA stands for Nagios Service Check Acceptor. use generic-service ; Name of service template to use Complete a blank sample electronically to Add the command to the NRPE configuration file on the client (/etc/nagios/nrpe_local.cfg): Now we can access the server and test it like any standard plugin. NPCA includes a service module that can check if a service is running. To figure this out I set nagios into debug mode with the configuration like this. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. 2. How Nagios process handles passive check results can be defined in the main Nagios configuration file. The -S option is not working with 2.0 plugins. 1. 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. By default Nagios supports URL monitoring and there is an command check_http, however if you want to monitor URL like SSL certification you can also do by extending the command options. Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. This task is really easy as Nagios has a built-in command for this. Nagios: monitor http service on a different port - Server Fault Allow Nagios server to run commands on the client by adding it to the allowed_hosts entry in /etc/nagios/nrpe.cfg. can anyone help me out for this problem:-, Check-Website-Response The documentation uses the example of: for . host_name Server01 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. For example, a plugin which returns a WARNING state will cause a service to have a WARNING state. 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. Last updated on September 22, 2020 by Sarmed Rahman. Simple invoke the command with -s parameter and the name of the service Example of use ./check_service -s ntpd Thank you! Cached checks will only provide a performance increase if you are making use of service dependencies. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. How to monitor common services with Nagios - Xmodulo 28. To monitor hosts and services running on remote machines, Nagios executes plugins and tells what information to collect. 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). /usr/local/nagios/libexec/check_ping -H 192.168.1.2 -w 100.0,90% -c 200.0,60% .use: 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. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. NSClient++ includes a service module that can check if a service is running. Nonetheless, they can be tuned to match the requirements. 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. That is superb artile I was looking for! 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. This requires trying to read the entire disk directly from the block device (such as /dev/sda1) and checking if the attempt has failed. 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. 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. Active checks are most common in the Nagios world. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? 164060 Nagios HTTP/HTTPS check via wget (with/without Proxy) Check website accessibility by return code and execution time. Nagios provides a sample configuration file, that we will use. Note: A host must be defined in Nagios before you can submit passive check results for it! 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). 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. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. 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 Nagios templates? How exactly do they work? : r/nagios - reddit >Mainly Focus on Kafka and Cloudera services, Cluster . Yeah, it's totally brute-force, but it works for me. 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. In order to do this, we need to enable active checks by setting the active_checks_enabled option to 1 without specifying the normal_check_interval directive. Nagios: Simple Oracle Check - Simon Krenger There are no attachments for this article. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. This article assumes you have a working knowledge of Nagios. Using Python Automation to interact with network devices [Tutorial], OpenCV: Detecting Edges, Lines, and Shapes. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. Pass the specified string as User Agent in HTTP header. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. The following line is commented out to make MySQL listens on all interfaces. The example contains partial output. Fortra's Intermapper vs Kaseya Traverse: which is better? If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. Does anyone have a working example of a dependencies.cfg file for nagios? Attributes can be used for both hosts and services. 5 check_http examples In general, if a check can be done quickly and does not require long running processes, it should definitely be done as an active service. Or you can create a custom variable to store the port number , with your example: 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. For example sudo gedit /usr/local/nagios/etc/servers/ubuntu_host.cfg # Ubuntu Host configuration file My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? check_command check_http -H MYIP -u http://MYIP/test.php 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). From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. 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. The default FQDN used for testing is www.google.com, but it can be changed as needed. Sometimes I find it tricky figuring out exactly what a plugin is doing. will hold the return value of commands between $( ). Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). 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. Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. can nagios adjust its check time based on the status info? The object file localhost.cfg allows for parameters to be passed to check_ssh. Passive Checks with Nagios ADMIN Magazine NSClient++ includes a service module that can check if a service is running. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state.

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