Hardware Requirements

We suggest using servers with Xeon CPU. Depending on the nature of the application, if the application requires analyzing user's input in real time, e.g., running lengthy R-scripts, Homer or other 3rd party tools, then a faster CPU or cluster setup (multiple servers) is preferred.

For standard applications that does not require using 3rd party tools in the backend in real time, a single server setup is sufficient.

As of December, 2021, the machine we use is: Intel Xeon E5 2.6GHz, 8 cores and 64GB of memory for hosting simple web applications that have less than 500 of concurrent users.

Software Requirements

Operating System: Linux. Prefer RHEL, CentOS
Database Requirement:
Minimum: MySQL 5.5; Preferred: MariaDB 10.6(Performance Reason)
If you are using MySQL 8.0+, please see the notes below.
Database Server Location: Can be local or remote with low latency.
Memory Database: Redis, prefer local because of low latency.
Webserver Requirement: Apache 2.4+, PHP 7.4

Package Installation

The following tutorial is designed for use in RHEL/CentOS 7. If your system is different, please contact us for details.


sudo rpm -Uvh https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
sudo rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
#sudo nano /etc/yum.repos.d/remi.repo


#sudo nano /etc/yum.repos.d/remi-php74.repo

#sudo nano /etc/yum.repos.d/CentOS-Base.repo

#sudo nano /etc/yum.repos.d/elrepo.repo



#sudo nano /etc/yum.repos.d/CentOS-fasttrack.repo

#sudo nano /etc/yum.repos.d/CentOS-CR.repo

Apache 2.4

sudo yum install httpd mod_ssl -y
sudo nano /etc/httpd/conf/httpd.conf

Options FollowSymLinks
AllowOverride All

PHP 7.4

We recommand the following packages:

yum install php php-common php-cli php-gd php-mbstring php-xml php-session php-json php-bcmath php-mcrypt php-dba php-tidy php-ldap php-intl php-gmp php-imap php-odbc php-enchant php-pdo_pgsql php-pgsql php-snmp php-soap php-pspell php-recode php-xmlrpc php-mysqlnd php-redis php-zip php-lz4 ph-sappy php-redis redis

Edit /etc/php.ini:

max_execution_time  = 600
max_input_time      = 600
memory_limit        = 8192M
max_input_vars      = 1000000
expose_php          = Off
error_reporting     = E_ALL & ~E_DEPRECATED & ~E_STRICT & ~E_NOTICE & ~E_WARNING
post_max_size       = 1024M
upload_max_filesize = 1024M
short_open_tag      = On
upload_tmp_dir      = /tmp
max_file_uploads    = 100;

Run the following commands to activate the new settings:

sudo systemctl restart httpd.service

MySQL / MariaDB 10.6

By default, RHEL / CentOS includes the MariaDB 5.5 in the repository. You will need to include the 10.6 repository. Please follow this guide to include it in your system.

sudo yum install mariadb-server mariadb -y

Edit /etc/my.cnf:

max_allowed_packet = 512M
max_connections = 3000

max_allowed_packet = 512M

Depending on the nature of your hosting environment, if it is a shared server with many databases, you may need to raise the limit of the number of tables (one MySQL table uses three files) used by the system concurrently :

sudo mkdir -p /etc/systemd/system/mariadb.service.d/
sudo nano /etc/systemd/system/mariadb.service.d/limits.conf

Run the following commands to activate the new settings:

#If you are using MySQL
sudo systemctl restart mysql.service

#If you are using MariaDB
sudo systemctl restart mariadb.service

Make sure that the MySQL user has full access to the database. Here is an example of creating a database user:

CREATE USER mysql_username@php_application_server_address IDENTIFIED BY 'database_password';
GRANT ALL ON *.* TO 'mysql_username'@'php_application_server_address';

MySQL 8+

By default, MySQL 8.0+ has changed the authentication method, also the default SQL mode will prevent the application from inserting data in some situations. We will need to modify the database settings.

Edit /etc/my.cnf:

default_authentication_plugin= mysql_native_password

Run the following commands to activate the new settings:

sudo systemctl restart mysql.service

Update your MySQL user such that it will use the native authentication method:

mysql -u root -p -h mysql_server_address

#Please modify the highlighted values to match your own server settings.
ALTER USER 'mysql_username'@'php_application_server_address' IDENTIFIED WITH mysql_native_password BY 'mysql_password';



sudo yum install php-redis redis -y

sudo systemctl start redis
sudo systemctl enable redis

Performance Testing

Create a script in any directory, e.g., /tmp:

nano test.php

$before = microtime(true);

for ($i=0 ; $i<10000 ; $i++) {

for ($j = 0; $j <= 10000; $j++){
	$list[$j] = $j*$j;

$temp = json_encode($list);

$after = microtime(true);
echo ($after-$before)/$i . " sec/action\n";


Run the test script:

php test.php

It will output something like the following:

0.00029415340423584 sec/action

The smaller the number, the better the performance. In general, we are looking for 0.0004 or below.