Since we are going to make the url public, it is good practice if we make it non-predictable.
sudo nano /opt/bitnami/apps/phpmyadmin/conf/httpd-prefix.conf
Alias /phpMyAdminZAQWDCFRTdf1236 "/opt/bitnami/apps/phpmyadmin/htdocs"
Now give the privileges to make it public.
sudo nano /opt/bitnami/apps/phpmyadmin/conf/httpd-app.conf
<IfVersion >= 2.3>
Require all granted
</IfVersion>
bitnami mysql passwordcat /home/bitnami/bitnami_application_password
This is wp-admin password / mysql root passwordcat /home/bitnami/bitnami_credentials
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