Setup custom DNS at application gateway for multi-tenant solution at a sub-domain level

Question

• In AKS we have UI running in a pod which is exposed by ingress controller on port 80, this is common for all tenants.
• In a VM which is multi-tenant, we have two applications running on port 8180 and 8230.
• Our requirement is http://example.com should route to AKS ingress controller for all tenants.
• Client1 which is http://client1.example.com should route it to 8230 port of the VM.
• Client2 which is http://client2.example.com should route it to 8180 port of the VM.

Our current configuration of application gateway is as follows -

• Three listeners on port 443 L_UI, L_CLIENT1 and L_CLIENT2
  For L_UI host type is configured as Single
  For L_CLIENT1 host type is configured as Single
  For L_CLIENT2 host type is configured as Single

For L_UI host name is configured as http://example.com
For L_CLIENT1 host name is configured as http://client1.example.com
For L_CLIENT2 host name is configured as http://client2.exmple.com

• Three backend pools pool_ui, pool_client1 and pool_client2
• Three rules rule_ui, rule_client1 and rule_client2 which is attached to respective backend target and backend settings
• Three backend settings as mentioned below:

backendsetting_ui on port 80

backendsetting_client1 on 8180

backendsetting_client2 on 8230

• One front end configurations with type public and associated listeners are L_UI, L_CLIENT1 and L_CLIENT2

Above is our requirement and approaches for multi-tenant solution by sub-domain, as we don't have domain and sub-domain like example.com.

Configuring the host name at application gateway listener will not work as there is no domain and sub-domain.

Do we need to create domain and sub-domain?

Answer 1

@Pranab Karmakar

Thank you for reaching out.

Based on my understanding, of you question above.

I wonder if you have considered configuring a multi-site listener for your application GAteway here for example like *.contoso.com and this way you can host multiple subdomains of the same parent domain on the same application gateway deployment. For example, you can host http://blog.contoso.com and http://app.contoso.com on a single application gateway deployment. Then use request routing rules to direct traffic to appropriate backend pool and port number. You can find more details here .

Please let me know if you have any additional question here. Thank you!