We are going to use Let's Encrypt Certificate Authority to create and install a free SSL certificate.

Step 1 - Log In

ssh -i /path/to/file.pem bitnami@xx.xxx.xxx.xxx

Step 2 - Install Git

Update your package manager.

sudo apt-get update

Install Git.

sudo apt-get install git

Step 3 - Download and install Certbot

Certbot is the client tool that will allow you to request and install an SSL certificate from Let's Encrypt.

cd /tmp

Download Certbot.

git clone https://github.com/certbot/certbot

Install Certbot.

cd certbot && ./certbot-auto

Step 4 - Request and install an SSL certificate

Generate And Install A Let's Encrypt Certificate using Certbot.

./certbot-auto certonly --webroot -w /opt/bitnami/apps/wordpress/htdocs/ -d SUBDOMAIN.MYDOMAIN.COM

Step 5 - Configure Apache

Link your SSL certificate and certificate key file to the correct locations.

sudo ln -s /etc/letsencrypt/live/SUBDOMAIN.MYDOMAIN.COM/fullchain.pem /opt/bitnami/apache2/conf/server.crt
sudo ln -s /etc/letsencrypt/live/SUBDOMAIN.MYDOMAIN.COM/privkey.pem /opt/bitnami/apache2/conf/server.key

Step 6 - Restart Apache

sudo /opt/bitnami/ctlscript.sh restart apache

Step 7 - Renew your Cert

How To Renew A Let's Encrypt Certificate For Your Domain Using The Certbot Client?

./certbot-auto renew

Access my app from only one domain

To redirect all these domains to your own domain, add the following configuration.

nano /opt/bitnami/apache2/conf/bitnami/bitnami.conf  
<VirtualHost _default_:80>
RewriteEngine On
RewriteCond %{HTTP_HOST} !^example.com$
RewriteCond %{HTTP_HOST} !^(localhost|
RewriteRule ^(.*)$ http://example.com$1 [R=permanent,L]

<VirtualHost _default_:443>
RewriteEngine On
RewriteCond %{HTTP_HOST} !^example.com$
RewriteCond %{HTTP_HOST} !^(localhost|
RewriteRule ^(.*)$ https://example.com$1 [R=permanent,L]


Installing Plugins

If at any point you struggle to install plug-ins, try this.

Change ownership.

sudo chown -R bitnami:daemon [installdir]/apps/wordpress/htdocs/wp-content

Change directory permissions.

sudo chmod -R g+w [installdir]/apps/wordpress/htdocs/wp-content