Hosting Multiple Wordpress Sites on Ubuntu 18.04+ Linux

To begin with, let's identify the two common methods of hosting multiple Wordpress installs. The first one is individual installs using Apache virtual-hosts or Nginx server blocks. This set-up allows you to install as many Wordpress websites as your server has resources for. Each vhost (virtual-host) or server block can be assigned its own domain and contain a separate working directory from other installs. 

The second method is using what is known as a Wordpress Multisite Network. This allows you to host and maintain multiple Wordpress websites from a single dashboard. This is especially handy if you want to contain multiple Wordpress installations for an organization under one umbrella.

In this guide, we are going to work with individual Apache2 virtual-hosts. 

Please note - This guide assumes that you already have a functional LAMP stack. If you are not already at this point, please see follow this guide until the 'Download Wordpress' section, continue with this current guide when you reach that point -> https://help.skysilk.com/support/solutions/articles/9000173246-how-to-install-wordpress-with-lamp-on-ubuntu 

Once you have a LAMP stack up and running, we're going to set up our hosting environment. Navigate to your www folder.

cd /var/www/

mkdir example.com secondsite.net thirdsite.org

wget https://wordpress.org/latest.tar.gz
tar -xzvf latest.tar.gz

sudo chown www-data:www-data example.com secondsite.net thirdsite.org

sudo chmod 755 example.com secondsite.net thirdsite.org

ls -ln

(Note, we are using root in this example. If you are logged in with a user other than root, you will need to ensure that you use sudo with some of the commands)

Next, we are going to create a MySQL Database as well as a corresponding database user for each site. 

mysql -u root -p

CREATE DATABASE wordpress_db;
GRANT ALL PRIVILEGES ON wordpress_db.* TO 'wordpress_user'@'localhost' IDENTIFIED BY 'wordpress_pw';
FLUSH PRIVILEGES;

CREATE DATABASE wordpress2_db;
GRANT ALL PRIVILEGES ON wordpress2_db.* TO 'wordpress2_user'@'localhost' IDENTIFIED BY 'wordpress2_pw';
FLUSH PRIVILEGES;

CREATE DATABASE wordpress3_db;
GRANT ALL PRIVILEGES ON wordpress3_db.* TO 'wordpress3_user'@'localhost' IDENTIFIED BY 'wordpress3_pw';
FLUSH PRIVILEGES;

EXIT;

sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/example.com.conf

<VirtualHost *:80>
    ServerAdmin admin@example.com
    ServerName example.com
    ServerAlias www.example.com
    DocumentRoot /var/www/example.com/
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

sudo cp /etc/apache2/sites-available/example.com.conf /etc/apache2/sites-available/secondsite.net.conf

<VirtualHost *:80>
    ServerAdmin admin@secondsite.net
    ServerName secondsite.net
    ServerAlias www.secondsite.net
    DocumentRoot /var/www/secondsite.net/
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

sudo cp /etc/apache2/sites-available/example.com.conf /etc/apache2/sites-available/thirdsite.org.conf

<VirtualHost *:80>
    ServerAdmin admin@thirdsite.org
    ServerName thirdsite.org
    ServerAlias www.thirdsite.org
    DocumentRoot /var/www/thirdsite.org
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

sudo a2ensite example.com.conf
sudo a2ensite secondsite.net.conf
sudo a2ensite thirdsite.org.conf

sudo a2dissite 000-default.conf

sudo systemctl restart apache2