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Using MultiTenancy Subdomain issue #12400

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[email protected] created

Hi,

I am setting up a multi-tenant system with ASP.NET Zero using subdomains and have structured my application as follows:

  • Landing Page: mydomain.com (public landing page)
  • Host & Tenant Registration: app.mydomain.com (admin panel & new tenant creation)
  • Tenant Subdomains:
    • tenant1.mydomain.com
    • tenant2.mydomain.com
  • Additional Services:
    • API: api.mydomain.com
    • Reporting Service: report.mydomain.com

Current Configuration

appsettings.production.json

"App": {
  "ServerRootAddress": "https://{TENANCY_NAME}.api.mydomain.com",
  "ClientRootAddress": "https://{TENANCY_NAME}.app.mydomain.com",
  "CorsOrigins": "https://*.mydomain.com"
}

appconfig.json

"remoteServiceBaseUrl": "https://api.mydomain.com",
"appBaseUrl": "https://{TENANCY_NAME}.app.mydomain.com"

My Issues & Questions

  1. Access Issue:

    • Currently, I can only access the app via tenant.app.mydomain.com, but not tenant.mydomain.com.
    • What could be causing this, and what needs to be adjusted for direct subdomain access (e.g., tenant1.mydomain.com)?

  2. DNS Configuration:

    • What type of A or CNAME record is required?
    • I assume I need *.mydomain.com, but do I also need specific entries for app.mydomain.com, api.mydomain.com, and report.mydomain.com?

  3. Additional Setup Requirements:

    • What else needs to be configured in ASP.NET Zero to ensure the described setup works correctly?
    • Are there any required changes in the tenancy resolution, CORS policies, or middleware settings?

Thanks for your help!

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2 Answer(s)
  • User Avatar
    0
    oguzhanagir created
    Support Team

    Hi

    Access Issue (tenant.mydomain.com Not Working)

    Your current setup is configured to use {TENANCY_NAME}.app.mydomain.com, meaning the system expects tenants to be accessed via tenant1.app.mydomain.com, not tenant1.mydomain.com. To enable direct access via tenant1.mydomain.com, you'll need to:

    By default, ASP.NET Zero uses subdomains in the format {TENANCY_NAME}.yourdomain.com, but your configuration suggests it expects {TENANCY_NAME}.app.mydomain.com.

    • Update ClientRootAddress & ServerRootAddress:
      • Modify your appsettings.json to reflect https://{TENANCY_NAME}.mydomain.com instead of https://{TENANCY_NAME}.app.mydomain.com.

    DNS Configuration

    To support wildcard subdomains for your tenants and services, you'll need the following DNS records:

    • Wildcard Subdomain:

      • mydomain.com → A record → Your server's IP (or CNAME if using a load balancer).
      • This ensures that tenant1.mydomain.com, tenant2.mydomain.com, etc., resolve properly.

    • Explicit Entries (if not covered by *.mydomain.com):

      • app.mydomain.com → A record → Your web app server IP.
      • api.mydomain.com → A record → API server IP.
      • report.mydomain.com → A record → Reporting service IP.

    Additional Setup Requirements To ensure everything functions correctly, consider the following adjustments:

    • CORS Configuration:

      • Ensure CorsOrigins in appsettings..json allows https://*.mydomain.com.

    • Wildcard SSL Certificate:

      • Ensure your SSL certificate supports *.mydomain.com to cover all tenant subdomains.
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    sailoper created

    I am using cloudflare and define rules to set tenantId in header for spesific sub/domains, you may also set inbound rules on iis to set tenantId in header

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