Installing nagios plugin problems

I am having the problem of installing a plump plugin on the centos operating system I tried all the possibilities and did not find any correct tutorial to help me.

You need to install the nagios-plugins-all package and edit your config.php adding this:

$config['show_services']  = 1;
$config['nagios_plugins'] = "/usr/lib64/nagios/plugins";

Also, ensure all the plugins are executable with:
chmod +x /usr/lib64/nagios/plugins/*

And you should be done with that.

All I said comes from the docs:

The only change is the directory, as in centos is different from the documentation.

thanks I solved, I want to ask one more thing what function it has? where it should be installed or not installed as we have seen it has several monitoring functions

In LibreNMS, none.

I didnt even know about that site.

I managed to add http service but I do not understand where I can add alert if the status of the service changes.

In Alerts->Alert Rules

Create rule from collection and search for service

how can I change the alert to be much faster to be a 30 second check for services

Last Changed Description Message
31 minutes 8 seconds HTTPS CRITICAL - Cannot make SSL connection.
139991931291568:error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure:s23_clnt.c:769:

how could I use the service description messages and Last Changed information in the message.

If you are using cronjob, just change the check-services.php one to the desired time

Create a template and attach to your alert rule