These are executed on regular intervals, as defined by check_interval and retry_interval. Syntax and Options A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). Thanks for contributing an answer to Server Fault! You can check whether a SSL certificate of the website expires within the next X number of days as shown below. You might also want to give the 'capture' plugin a try. # yum -y install httpd gcc glibc glibc-common gd gd-devel openssl-devel net-snmp net-snmp-devel net-snmp-utils snmp* bc xinetd make wget (php php-mysql) . I wrote a plugin in a bash script to check for current Warnings. The following is a sample script that will accept the host name, status code, and output from a check and will submit these to Nagios: As an example of the use of this script, the command that is sent to Nagios for host01, status code 2 (UNREACHABLE) and output router 192.168.1.2 down would be as follows: When submitting results, it is worth noting that Nagios might take some time to process them, depending on the intervals between Nagios checks of the external command pipe. Is it possible to check a web page through an authenticated proxy server? Nagios check_udp_ports returning critical: result to scheduled check, runs fine manually, Nagios - check procs and --metric=elapsed on the same service. 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. Nevertheless, in response to your comment, I don't think there's an error in that, as Bash variables are untyped. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. 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. In such cases, Nagios decides when a check is to be performed, runs the check and stores the result. 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. Affordable solution to train a team and make them project ready. Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. 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. 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. Monitoring Website URL Status 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. When Nagios needs to run a scheduled service check, it will initiate the service check and then return to doing other work (running host checks, etc). These plugin states directly translate to service states. 2. With a little tweaking, Nagios can help monitor this application port as well. 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. It is called NSCA (Nagios Service Check Acceptor). Now in your configuration for checks for a host you can create the following service check. Far better then Nagios documentation. 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. For example: nagios@nagiosserver:~/ > $ ssh-keygen -t dsa Generating public/private dsa key pair. Periodically when these checks are processed, notifications or alerts are sent depending on the information in check result. 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. Learn more about Stack Overflow the company, and our products. 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. A good example of such a test is checking whether there are bad blocks on a disk. NSClient++ includes a service module that can check if a service is stopped. /usr/nagios/libexec/check_http .. Architect and design WAP data flow using BigData Platform. Kaydolmak ve ilere teklif vermek cretsizdir. On a finishing note, Nagios can monitor many other sectors of a network. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. How can I manually run a nagios check from the command line? 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. Now let us add check_interval directive. It allows to configure alerts and has different states for them. Nagios provides a sample configuration file, that we will use. 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 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). It is vital to make sure only legitimate networks have access to the database. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. So in this blog post is all about how I used Hiera to manage the Dev,Test, Prod Stratos environments. rev2023.3.3.43278. These are real-time graphs showing things like CPU usage, memory usage, and bandwidth. It is possible to configure Nagios so that it will receive status information sent over a command pipe. The results are passed to Nagios in the same way as they are passed for hosts. Up To: Contents Services are those which are used by Nagios to check something about a host. Can i specify what a valid response is, i.e. This can be done to gather all critical errors to a single, central place. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. First, install the Nagios Core server. 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 . 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. Scheduled service checks are run in parallel. The following figure shows soft states and hard states. 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. The figure shown below shows a passive check . When services change state too frequently they are considered to be "flapping". This user is then granted all permission to all databases and will be used for monitoring. Expected response string. Usually within a few seconds the full check command pops up and I then kill the while loop and run the check command. 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. Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Unlike active checks, Nagios will not take network topology into consideration by default. It only takes a minute to sign up. 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. Nagios' check_ssh (of course) keeps marking the process as critical since it can't connect on that port. When it is an active check result, Nagios takes the fact that switch1 is down into account and maps the child nodes result into an UNREACHABLE state. If I used the first method, I have to keep separate site.pp for each environment. Often, you have situations where other applications can report if a certain service is working properly or not. 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. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. This can cause problems if you are submitting passive checks from a remote host or you have a distributed monitoring setup where the parent/child host relationships are different. Learn more. Note: A service must be defined in Nagios before you can submit passive check results for it! The host or the services will be tested again and again till the time the status is permanent. Select check_cluster from the plugin pop-up menu. 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. 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. Force a check and you will see exactly how the command is being run. If you don't make use of service dependencies, Nagios won't perform any on-demand service checks. How to tell which packages are held back due to phased updates. A user [emailprotected] is created in MySQL server. It has been designed to run . 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 can monitor different mail server components like SMTP, POP, IMAP and mailq. However, applications on remote hosts can't do this so easily. Another example is where an application already processes information such as network bandwidth utilization. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. You'll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. NPCA includes a service module that can check if a service is stopped. It's pretty simple. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation On-demand service checks are also run in parallel if needed. I've # provided some comments here, but things may not be so clear without further # explanation, so make sure to read the HTML documentation! Nagios also offers another way to work with the statuses of hosts and services. When max_check_attempts is executed and status of the host or service is still not OK, then hard state is used. Does anyone have a working example of a dependencies.cfg file for nagios? NSClient++ includes a service module that can check if a service is running. Passive checks are initiated and performed by external applications/processes, Passive check results are submitted to Nagios for processing, Asynchronous in nature and cannot be monitored effectively by polling their status on a regularly scheduled basis, Located behind a firewall and cannot be checked actively from the monitoring host. Use Hiera. 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. These types of checks are called Active Checks. I've provided some comments here, but things may not be so # clear without further explanation. 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, when a web application cannot connect to the database, it will let Nagios know about it immediately. I've deployed a new instance of Nagios on a fresh install of CentOS 7 via the EPEL repository. Previous parts of this book often mentioned Nagios performing checks on various software and machines. Stats Graphs - Live data graphs of CPU, memory, interface bandwidth, and disk usage. Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video. 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 :). As mentioned earlier, server-2 has postfix mail server set up on it. 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 command accepts the host name, service description, status code, and the textual output from a check. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Repeat this procedure for each Ceph plug-in applicable to the node. Asking for help, clarification, or responding to other answers. In fact, we officially. Far better then Nagios documentation. 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. check_http plugin is used to verify the status of HTTP server (or HTTPS) that is running on a remote host. Nagios comes with a wide range of built-in scripts for monitoring services. A good example might be running a check that takes several hours to completein this case, it does not make sense to raise the global service_check_timeout option, but rather to schedule these checks outside of Nagios and only report the results back to it. The plugin returns a CRITICAL state if the service is not started. You can create a host file inside the server directory of Nagios and mention the host and service definitions.
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