CODEWITHSUNDEEP
phpreactjsapacheload-balancing
Krishna Chebrolu
Krishna Chebrolu

Reputation: 145

How to configure AWS ALB for a server hosting multiple subdomains?

I have an AWS EC2 server with a website that is pointing to 5 different sub-domains. 3 subdomains are on CodeIgniter 3.x php. 1 is using Laravel 5.6 php and 1 is using React JS. Wild Card SSL is configured for all these websites.

A couple of these are expected to receive huge traffic for few weeks every 2-3 months, which prompts to configure a Load Balancer by adding additional servers to balance the load.

Let's name them

The traffic is expected on reactapp.example.com which is served in association with lv.example.com.

the httpd.conf entries are like this.

<VirtualHost *:80>
  ServerAdmin [email protected]
  DocumentRoot /var/www/html/ci1/
  ServerName ci1.example.com

  CustomLog "/var/log/httpd/ci1_access.log" combined
  ErrorLog "/var/log/httpd/ci1_error.log"
  RewriteEngine on
  RewriteCond %{SERVER_NAME} =ci1.example.com
  RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>

Similar entries for subdomains ci2, ci3, lv and reactapp exist.

  1. Is it possible to have a load balancer that points to multiple instances with each serving traffic coming into separate subdomain?
  2. How to achieve this?
  3. What changes are to be made in httpd.conf?

BTW, I have tried removing ServerName directive and changed the port to 443. Also, tried keeping only one VirtualHost something like below just to see if I can achieve it at least for one subdomain.

<VirtualHost *:443>
  DocumentRoot /var/www/html/reactapp/
  <Directory /var/www/html/reactapp/>
    Options +Indexes
    AllowOverride All
  </Directory>
  CustomLog "/var/log/httpd/reactapp_access.log" combined
  ErrorLog "/var/log/httpd/reactapp_error.log"
</VirtualHost>

So far, no luck. Always a blank page is displayed with no error log. If ServerName directive is added, the site is coming up. But, httpd access log is getting populated in all servers added to the target group.

Any suggestions would be highly appreciated.

Upvotes: 0

Views: 35

Answers (1)

Juranir Santos
Juranir Santos

Reputation: 429

Assuming all your requests will come from the same address, you can add in your VirtualHost a ServerAlias parameter (you can define multiples for the same virtualhost), so the load balancer will redirect to the same address and the server can answer.

https://httpd.apache.org/docs/2.4/mod/core.html#serveralias

Upvotes: 0

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