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. 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% Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. Now send a trap and see how the service appears as in Nagios XI. (In this example, the script will print All ok and it will exit with 0, the OK . External applications can submit passive service check results to Nagios by writing a PROCESS_SERVICE_CHECK_RESULT external command to the external command file. 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. This way, Nagios can help monitor the accessibility of both MySQL servers and the database stored within the servers. We make use of First and third party cookies to improve our user experience. 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. Some of the scripts provided with Nagios are restricted to the local server only. 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. Nagios: Simple Oracle Check. Thank you for any assistance you can provide. }. 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. In order to make Nagios treat passive host check results in the same way as active check results, we need to enable the following option: By default, Nagios treats host results from passive checks as hard results. check_command /usr/share/nagios/plugins/check_http -H MYIP -u http://MYIP/test.php, Hi, Difficulties with estimation of epsilon-delta limit proof, The difference between the phonemes /p/ and /b/ in Japanese. 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. Treat NRPE connection failures as 'UNKNOWN' service state, and don't notify on UNKNOWN services . 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. The check_init_service plugin does not support checking multiple services. Nagios stores the status of the hosts and services it is monitoring to determine if they are working properly or not. The following screenshot shows a complete overview of all the service checks that have been configured so far. Hosts and service configurations are the building blocks of Nagios Core. 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 object file localhost.cfg allows for parameters to be passed to check_ssh. It is possible to configure Nagios so that it will receive status information sent over a command pipe. By default, Nagios handles results from active and passive checks differently. 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. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. In fact, we officially. When a host or service is down for a very short duration of time and its status is not known or different from previous one, then soft states are used. check_http: command not found. This can be done in addition to active checks, to identify critical problems earlier. 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. 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). Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again. 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. In the following example, we are checking whether the website certificate expires in the next 365 days. The processing of active and passive check results is essentially identical. However, two hours after the last passive or active check result was received, Nagios would perform an active check to keep the results up-to-date. Learn more. Services are those which are used by Nagios to check something about a host. With a little tweaking, Nagios can help monitor this application port as well. 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. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Can i specify what a valid response is, i.e. 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. Like every Nagios plugin, you will want to check from the command line before adding it to the configuration files. Nagios will ignore all check results for hosts that had not been configured before it was last (re)started. 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. 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. As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. Using the definition below, checks on the host will be performed after every 3 minutes. . 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. Detecting and dealing with state changes is what Nagios is all about. NPCA allows you to check multiple services, here is an example that checks for some services that are running and some that are stopped. The Nagios server is running on Ubuntu. You can check tomcat server, or apache server, or glassfish, or any server that is running on a different port by speficying the port number as shown below. To turn on everything you want to set debug_level=4095. In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Note: A service must be defined in Nagios before you can submit passive check results for it! Nagios Plugins Nagios Plugins does not include a service plugin however the linux-nrpe-agent does provide check_init_service. (1 + 2 + + 2048), Also note that your debug file will grow quickly and then rotate itself. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. The first parameter tells Nagios that it should check whether the results from the checks are up-to-date. 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}. Related Commands. The output indicates that it expires in 300 days. The -S option is not working with 2.0 plugins. 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. More information on how this works can be found here. No software installation. 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. Use Puppet environments. debug_level=2048 With nagios in debug mode I simply tail the debug_log file debug_file=/var/log/nagios3/nagios.debug. - 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]: These checks are scripts and progams which take input (for example, which host to check, tresholds), do a check and then return an exit code and some performance data. 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. 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 can be used to monitor Apache web server as well. sudo usermod -aG docker kifarunix. By using this website, you agree with our Cookies Policy. Some methods support checking multiple services at once. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. I've: 5 # provided some comments here, but things may not be so clear without further . This is how your host definitions look currently . Note that all the configuration in this section is done on the client to be checked, not in the nagios server. For HTTPS running on a different port, do the following. Syntax and Options Passive checks are performed by external processes and the results are given back to Nagios for processing. In the Select resource macro: section, select USER1. This feature is only available to subscribers. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. November 2012, by Simon Krenger. Define the checks on /etc/nagios/nrpe_local.cfg. Filters such as firewall and TCP wrappers should be used. The Nagios passive check technique described in this article uses Nagios Service Check Acceptor (NSCA) . Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. Check WMI Plus includes a service module that can check if a service is stopped. 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. Line 1 ##### 2 # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. Viewed 12725 times since Tue, Nov 14, 2017, Viewed 18667 times since Tue, Nov 28, 2017, Viewed 70502 times since Thu, Nov 9, 2017, Viewed 9709 times since Tue, Nov 14, 2017, Viewed 12197 times since Wed, Nov 29, 2017, Viewed 47389 times since Thu, Nov 9, 2017, Viewed 14647 times since Sun, Nov 26, 2017, Viewed 42173 times since Mon, Nov 13, 2017, Viewed 18034 times since Wed, Nov 15, 2017, Viewed 22586 times since Sun, Nov 26, 2017. 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. The example contains partial output. Minimum number of days a SSL certiface must be valid. 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. Agree Nagios check service frequency based on service status, how can execute nagios commands from command line in linux. In Nagios, 2 types of checks are performed on hosts and services . Note: Passive host checks are normally treated as HARD states, unless the passive_host_checks_are_soft option is enabled. Hi, this is a fantastic article, i managed to learn how to make plugins myself. 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. Always remember, prior to reloading Nagios, check that there are no errors in the configuration. Check whether Apache HTTPS is running on a remote server using check_http. It is vital to make sure only legitimate networks have access to the database. I am gettinr this error in nagios3. The main Nagios process then handles the check results and takes appropriate action (running event handlers, sending notifications, etc.). Complete a blank sample electronically to Affordable solution to train a team and make them project ready. Or you can create a custom variable to store the port number , with your example: Nagios provides a sample configuration file, that we will use. This yields less output to dig through. Passive checks are also used when configuring distributed or redundant monitoring installations. 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). Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. I've provided some comments here, but things may not be so # clear without further explanation. On a finishing note, Nagios can monitor many other sectors of a network. Host is just like a computer; it can be a physical device or virtual. The script should then post results to the Nagios daemon. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Even if its parent host is currently DOWN, the child host state is also stored as DOWN. The command to submit passive checks is PROCESS_HOST_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=115). Server Fault is a question and answer site for system and network administrators. 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. For Nagios, many, many Oracle plugins are available for checking database availability and performance. notifications_enabled 0 It only takes a minute to sign up. can nagios adjust its check time based on the status info? If up-to-date information has been provided by a passive check during this period, then it will not perform active checks. 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). 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. The figure shown below shows an active check . This will give an idea on whether the execution will be successful and what the output of the script will look like. How Nagios process handles passive check results can be defined in the main Nagios configuration file. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. 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). Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. JOB, 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. The best answers are voted up and rise to the top, Not the answer you're looking for? To use a custom script as a plugin to run remotely through NRPE, you should first write the script on the server, for instance in /usr/local/scripts/check_root_home_du.sh: The previous script is a very simple example, checking the disk usage of the directory /root and setting a threshold for considering it OK, Warning or Critical. Nagios will ignore all check results for services that had not been configured before it was last (re)started. Now we know that the custom plugin is working on the client and on the server, and that the NRPE is communicating correctly, we can go ahead and configure Nagios files for checking the remote device. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. This allows for seamless integration of status information from external applications with Nagios. But if you just want to check if the instance is up and running (and not add more complexity), you can use the simple script provided here. The host status code should be 0 for an UP state, 1 for DOWN and 2 for an UNREACHABLE state. 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. Now in your configuration for checks for a host you can create the following service check. Service state changes can also trigger on-demand host checks. You can create a host file inside the server directory of Nagios and mention the host and service definitions. To identify the status of a monitored service, Nagios runs a check plugin on it. ##### # # NAGIOS.CFG - Sample Main Config File for Nagios # # Read the documentation for more information on this configuration # file. You might also want to give the 'capture' plugin a try. # 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.
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