AWS Apache2 reverse proxy with godaddy not working - amazon-web-services

Question

I have purchased a godaddy domain and AWS EC2 instance with elastic ip. In godaddy I created following entries
A-name entry ( mydomain.com ) pointing to elastic ip
And a C-name entry (app2.mydomain.com) pointing to same elastic ip
Inside amazon EC2 instance , I am running two applications
app1 - running on localhost:3000
app2 - running on localhost:4000
Now, I am trying to achieve below
mydomain.com should point to app1 running on localhost:3000
app2.mydomain.com should point to app2 running on localhost:4000
I have installed apache2 on EC2 and followed below links to configure reverse proxy
link1
I created myproxy.conf under apache2/sites-available as below
<VirtualHost mydomain.com:80>
ServerName mydomain.com
ProxyPreserveHost On
ProxyPass / http://localhost:3000/
ProxyPassReverse / http://localhost:3000/
</VirtualHost>
<VirtualHost app2.mydomain.com:80>
ServerName app2.mydomain.com
ProxyPreserveHost On
ProxyPass / http://localhost:4000/
ProxyPassReverse / http://localhost:4000/
</VirtualHost>
But I can't get it working. But when I change the conf as below
<VirtualHost *:80>
ServerName app2.mydomain.com
ServerAdmin admin#mydomain.com
ProxyPreserveHost On
ProxyPass / http://localhost:4000/
ProxyPassReverse / http://localhost:4000/
</VirtualHost>
Both mydoamin.com and app2.mydomain.com launch same app2 application.
I could not figure out what I am missing.
Edit
Soon after I post this, I tried something which seems to work. I added *.80 instead of app2.mydomain.com
<VirtualHost *:80>
ServerName app2.mydomain.com
ServerAdmin admin#mydomain.com
ProxyPreserveHost On
ProxyPass / http://localhost:4000/
ProxyPassReverse / http://localhost:4000/
</VirtualHost>
<VirtualHost *:80>
ServerName mydomain.com
ServerAdmin admin#mydomain.com
ProxyPreserveHost On
ProxyPass / http://localhost:3000/
ProxyPassReverse / http://localhost:3000/
</VirtualHost>

Answer 1

Currently you are trying to run code on apache2 default port 80.
You need to run both application on diff port.Try running code on different port
<VirtualHost *:8081>
Listen 8081
ServerName mydomain.com
ServerAdmin admin#mydomain.com
ProxyPreserveHost On
ProxyPass / http://localhost:3000/
</VirtualHost>
Don't forget to open port in listen mode by LISTEN port_no