Using Amazon AWS Route 53 & Apache 2.4 web server
Create a Canonical name with wild card to route all the sub domains traffic to the root web server located.
Now add sub domains details along with root domain routings like below.
# -----------------------------------
# GS - Virtual Host Configurations
# -----------------------------------
<VirtualHost *:80>
ServerName www.gajen.com
ServerAlias gajen.com
DocumentRoot "/var/www/html"
</VirtualHost>
# Stagings
# --------
# Discovery
<VirtualHost *:80>
ServerName discovery.gajen.com
DocumentRoot "/var/www/html/discovery"
</VirtualHost>
# Alpha
<VirtualHost *:80>
ServerName alpha.gajen.com
DocumentRoot "/var/www/html/alpha"
</VirtualHost>
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