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How To Use Nmap to Scan for Open Ports on your VPS

Introduction

Networking is an expansive and overwhelming topic for many budding system administrators. There are various layers, protocols, and interfaces, and many tools and utilities that must be mastered to understand them.

Source

Nmap Cheat Sheet and Pro Tips

Nmap has a multitude of options and when you first start playing with this excellent tool it can be a bit daunting. In this cheat sheet you will find a series of practical example commands for running Nmap and getting the most of this powerful tool.

Keep in mind that this cheat sheet merely touches the surface of the available options. The [Nmap Documentation portal][1] is your reference for digging deeper into the options available.

![][2]

Golang Workers / Job Queue

A running example of the code from:

This gist creates a working example from blog post, and a alternate example using simple worker pool.

TLDR: if you want simple and controlled concurrency use a worker pool.

	user web;

	# One worker process per CPU core.
	worker_processes 8;

	# Also set
	# /etc/security/limits.conf
	# web soft nofile 65535
	# web hard nofile 65535
	# /etc/default/nginx

	# Install tmux on rhel/centos 7

	# install deps
	yum install gcc kernel-devel make ncurses-devel

	# DOWNLOAD SOURCES FOR LIBEVENT AND MAKE AND INSTALL
	curl -OL https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz
	tar -xvzf libevent-2.0.22-stable.tar.gz
	cd libevent-2.0.22-stable
	./configure --prefix=/usr/local

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8" />
	<title>Add React in One Minute</title>
	</head>
	<body>

	<h2>Add React in One Minute</h2>
	<p>This page demonstrates using React with no build tooling.</p>

	# Advanced config for NGINX
	server_tokens off;
	add_header X-XSS-Protection "1; mode=block";
	add_header X-Content-Type-Options nosniff;

	# Redirect all HTTP traffic to HTTPS
	server {
	listen 80;
	server_name www.domain.com domain.com;
	return 301 https://$host$request_uri;

	#!/bin/bash

	echo "\n\n--- Killing Stupid Adobe Auto Load Crap ---\n\n"

	launchctl unload -w /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist
	launchctl unload -w /Library/LaunchAgents/com.adobe.AAM.Updater-1.0.plist

	echo "\n\n--- Done! ---\n\n"

	package main

	const MaxLength = 1 << 20

	var (
	addr = flag.String("listen", ":8000", "listen for requests")
	numprocs = flag.Int("p", runtime.NumCPU(), "number of workers to start")
	maxqueue = flag.Int("q", runtime.NumCPU()*2, "largest queue size")

	jobs chan Job