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1. requirements 
Apache >= 2.2
PHP >= 5.5
MySQL/MariaDB >= 5.5

Step 1 – Enable Remi Repository
### CentOS/RHEL 7 ###
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

### CentOS/RHEL 6 ###

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vim /etc/httpd/conf.d/expire.conf

<IfModule mod_expires.c>
# Turn on the module.
ExpiresActive on
# Set the default expiry times.
ExpiresDefault "access plus 2 days"
ExpiresByType image/jpg "access plus 1 month"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"

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sync; echo 1 > /proc/sys/vm/drop_caches
sync; echo 2 > /proc/sys/vm/drop_caches
sync; echo 3 > /proc/sys/vm/drop_caches

crontab -l
0 * * *  * sync; echo 3 > /proc/sys/vm/drop_caches

free -m

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<VirtualHost *:80>
    ServerName www.domain.org
    DocumentRoot /var/www/html/domain
    ServerAlias domain.org
    <Directory />
    	Options FollowSymLinks
    	AllowOverride All
    </Directory>
  RewriteEngine on
  RewriteCond %{SERVER_NAME} = www.domain.org.org [OR]

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- The default will restrict you to a max 2 MB upload file size.
- upload_max_filesize – The maximum size of an uploaded file.
- memory_limit – This sets the maximum amount of memory in bytes that a script is allowed to allocate. This helps prevent poorly written - scripts for eating up all available memory on a server. Note that to have no memory limit, set this directive to -1.
post_max_size – Sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than upload_max_filesize. If memory limit is enabled by your configure script, memory_limit also affects file uploading. Generally speaking, memory_limit should be larger than post_max_size.
---------------------------------------

- There are two methods two fix this problem.

* 1: Edit php.ini 
Edit your php.ini file (usually stored in /etc/php.ini or /etc/php.d/cgi/php.ini or /usr/local/etc/php.ini):

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iptables -I INPUT -p tcp -m tcp --dport 3000 -j ACCEPT
service iptables save
service iptables restart
iptables -L -n

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sudo yum install -y gcc-c++ make
curl -sL https://rpm.nodesource.com/setup_11.x | sudo -E bash -
sudo yum install -y nodejs
node -v
npm -v

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import axios from "axios";

const open_download_file = async (url, file_name) => {
	return await axios({
		url: url,
		method: 'GET',
		responseType: 'blob', // important
		onDownloadProgress: (progressEvent) => {
			const percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total);
			console.log(`download ${percentCompleted}%`);

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When a Node.js process is launched, it runs:

One process
One thread
One event loop
One JS Engine Instance
One Node.js Instance
One process: a process is a global object that can be accessed anywhere and has information about what’s being executed at a time.

One thread: being single-threaded means that only one set of instructions is executed at a time in a given process.

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Every Layout will teach you how to better harness the built-in algorithms that power browsers and CSS.

The Stack
The Box
The Center
The Cluster
The Sidebar
The Switcher
The Cover
The Grid