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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044275 by Neo on Monday 17th of February 2020 09:00:11 PM
Old 02-17-2020
Update:

I have confirmed 100% the source of the these spikes were very aggressive, rogue, unidentified bots originating on Chinese networks. After blocking the resident networks of these bots, all spikes have stopped, completely.

This is a "huge success story", going from unknown, uncorrelated performance hits / spikes due to nearly random spikes in performance to cause identification and total resolution. As you can see from the graph over the last 24 hours, there have been zero spikes.

Nearly Random, Uncorrelated Server Load Average Spikes-screen-shot-2020-02-18-84642-amjpg


I will keep the same MQTT and Node-RED instrumentation in place (which I am very pleased with) and will also keep all "spike trapping" instrumentation and DB logging in place, so if other spikes appear, which I am fairly confident more of these "pesky" bots will appear sooner or later, I will trap them, identify the source and block their resident networks.

Success!

MQTT and Node-RED did not "solve the problem". MQTT and Node-RED provided a very powerful and flexible way for me to quickly instrument custom sensors and logging, which helped me identify the problem.

I highly, recommend MQTT and Node-RED. These tools are free. Thank you very much MQTT and Node-RED developers!
This User Gave Thanks to Neo For This Post:
 

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Mojo::IOLoop::Server(3pm)				User Contributed Perl Documentation				 Mojo::IOLoop::Server(3pm)

NAME
Mojo::IOLoop::Server - Non-blocking TCP server SYNOPSIS
use Mojo::IOLoop::Server; # Create listen socket my $server = Mojo::IOLoop::Server->new; $server->on(accept => sub { my ($server, $handle) = @_; ... }); $server->listen(port => 3000); # Start and stop accepting connections $server->start; $server->stop; DESCRIPTION
Mojo::IOLoop::Server accepts TCP connections for Mojo::IOLoop. EVENTS
Mojo::IOLoop::Server can emit the following events. "accept" $server->on(accept => sub { my ($server, $handle) = @_; ... }); Emitted safely for each accepted connection. ATTRIBUTES
Mojo::IOLoop::Server implements the following attributes. "accepts" my $accepts = $server->accepts; $server = $server->accepts(10); Number of connections to accept at once, defaults to 10. "reactor" my $reactor = $server->reactor; $server = $server->reactor(Mojo::Reactor::Poll->new); Low level event reactor, defaults to the "reactor" attribute value of the global Mojo::IOLoop singleton. METHODS
Mojo::IOLoop::Server inherits all methods from Mojo::EventEmitter and implements the following new ones. "listen" $server->listen(port => 3000); Create a new listen socket. Note that TLS support depends on IO::Socket::SSL and IPv6 support on IO::Socket::INET6. These options are currently available: "address" Local address to listen on, defaults to all. "backlog" Maximum backlog size, defaults to "SOMAXCONN". "port" Port to listen on. "tls" Enable TLS. "tls_ca" Path to TLS certificate authority file. "tls_cert" Path to the TLS cert file, defaults to a built-in test certificate. "tls_key" Path to the TLS key file, defaults to a built-in test key. "generate_port" my $port = $server->generate_port; Find a free TCP port, this is a utility function primarily used for tests. "start" $server->start; Start accepting connections. "stop" $server->stop; Stop accepting connections. SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojo::IOLoop::Server(3pm)
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