PHP implements open source Nagios network monitoring tool

Nagios is an open source network monitoring tool used to monitor the running status of networks, servers and applications. It can detect and report network anomalies, failures and performance issues to help system administrators take timely measures to avoid system crashes.

In this article, we will introduce how to use the PHP language to implement the open source Nagios network monitoring tool, and discuss how to apply it in a practical environment.

1. Install PHP and Nagios

Before you begin, you need to install PHP and Nagios. PHP is a popular web programming language that can be used with Nagios to write plug-ins, views, and other web interfaces. You can download the installation program from the PHP official website (https://www.php.net/) and install it according to the prompts. Nagios is also a popular network monitoring tool. You can download the installation program from the Nagios official website (https://www.nagios.org/) and install it according to the instructions.

2. Writing Nagios plug-ins

Nagios plug-ins are programs used to detect network devices and applications. You can write plugins in PHP and save them in the Nagios plugin directory. The following is a simple PHP plug-in example for detecting HTTP servers:

#!/usr/bin/php
<?php
$host = $argv[1];
$port = $argv[2];

$timeout = 5;

$fp = fsockopen($host, $port, $errno, $errstr, $timeout);
if (!$fp) {
    echo "CRITICAL - Cannot connect to $host:$port
";
    exit(2);
}

$request = "GET / HTTP/1.0

";
fwrite($fp, $request);
$response = fgets($fp, 4096);

fclose($fp);

if (strpos($response, "200 OK") === false) {
    echo "CRITICAL - HTTP server did not respond with 200 OK status
";
    exit(2);
}

echo "OK - HTTP server is responding
";
exit(0);
?>

The above plug-in detects the status of the HTTP server, first tries to connect to the host and port number, if the connection fails, the plug-in returns the "CRITICAL" status . If the connection is successful, an HTTP request is sent to the server. If the server response status code is "200 OK", the plug-in returns the "OK" status. Otherwise, the plugin returns "CRITICAL" status.

3. Configure Nagios

After installing and configuring PHP and Nagios, you need to configure the plug-in into Nagios monitoring. You can add the PHP plug-in by adding the following line to the Nagios configuration file:

define command{
    command_name    check_http_php
    command_line    /usr/local/bin/php /usr/local/nagios/libexec/check_http_php.php $ARG1$ $ARG2$
}

The above defines a command named "check_http_php", which uses the "check_http_php.php" plug-in and the two parameters "$ARG1$" and "$ARG2$".

In order to use this command with Nagios monitoring, you need to associate a service with the command. You can use the following Nagios configuration file to add the following lines:

define service{
    use                generic-service
    host_name          localhost
    service_description HTTP
    check_command      check_http_php!localhost!80
}

The above defines a service named "HTTP", which monitors the HTTP port on the local host and uses the "check_http_php" command to detect it.

4. Test

After completing the above configuration, we can test whether the Nagios network monitoring tool implemented in PHP can work normally. You can check the status of the HTTP server by executing the following command on the command line:

/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_http_php!localhost!80

If everything is OK, a message describing the HTTP status should be returned.

5. Summary

Now, you have learned how to use the PHP language to implement the open source Nagios network monitoring tool. By writing plug-ins and configuration files, you can monitor the status of network devices and applications and take prompt action to resolve any issues. In actual applications, you can customize and expand it according to your needs and scenarios.

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