Custom domain names and bring your own certificates in Azure Container Apps

Azure Container Apps allows you to bind one or more custom domains to a container app.

• Every domain name must be associated with a TLS/SSL certificate. You can upload your own certificate or use a free managed certificate.
• Certificates are applied to the container app environment and are bound to individual container apps. You must have role-based access to the environment to add certificates.
• SNI (Server Name Identification) domain certificates are required.
• Ingress must be enabled for the container app.

Note

If you configure a custom environment DNS (Domain Name System) suffix, you cannot add a custom domain that contains this suffix to your Container App.

Add a custom domain and certificate

Important

If you are using a new certificate, you must have an existing SNI domain certificate file available to upload to Azure.

1. Navigate to your container app in the Azure portal

2. Verify that your app has ingress enabled by selecting Ingress in the Settings section. If ingress isn't enabled, enable it with these steps:

   1. Set HTTP Ingress to Enabled.
   2. Select the desired Ingress traffic setting.
   3. Enter the Target port.
   4. Select Save.

3. Under the Settings section, select Custom domains.

4. Select the Add custom domain button.

5. In the Add custom domain and certificate window, in TLS/SSL certificate, select Bring your own certificate.

6. In domain, enter the domain you want to add.

7. Select Add a certificate.

8. In the Add certificate window, in Certificate name, enter a name for this certificate.

9. In Certificate file section, browse for the certificate file you want to upload.

10. Select Validate.

11. Once validation succeeds, select Add.

12. In the Add custom domain and certificate window, in Certificate, select the certificate you just added.

13. Select the Hostname record type based on the type of your domain.

    Domain type	Record type	Notes
    Apex domain	A record	An apex domain is a domain at the root level of your domain. For example, if your DNS (Domain Name System) zone is contoso.com, then contoso.com is the apex domain.
    Subdomain	CNAME	A subdomain is a domain that is part of another domain. For example, if your DNS zone is contoso.com, then www.contoso.com is an example of a subdomain that can be configured in the zone.

14. Using the DNS provider that is hosting your domain, create DNS records based on the Hostname record type you selected using the values shown in the Domain validation section. The records point the domain to your container app and verify that you own it. The setup depends on whether you are using custom domains with the private endpoint (preview) feature:

    General

    • If you selected A record, create the following DNS records:

      Record type	Host	Value
      A	@	The IP address of your Container Apps environment.
      TXT	asuid	The domain verification code.

    • If you selected CNAME, create the following DNS records:

      Record type	Host	Value
      CNAME	The subdomain (for example, www)	The generated domain of your container app.
      TXT	asuid. followed by the subdomain (for example, asuid.www)	The domain verification code.

    Private endpoint

    • If you selected A record, you need to have a private DNS zone which has the same DNS zone name as your public DNS. Create the following DNS record on your private DNS zone:

      Record type	Host	Value
      A	@	The Private IP of your private endpoint on your container apps environment.

      In addition, you will need to add the following record to your public DNS zone.

      Record type	Host	Value
      TXT	asuid	The domain verification code.

    • If you selected CNAME, create the following DNS records on your public DNS zone:

      Record type	Host	Value
      CNAME	The subdomain (for example, www)	The generated domain of your container app.
      TXT	asuid. followed by the subdomain (for example, asuid.www)	The domain verification code.

15. Select the Validate button.

16. Once validation succeeds, select the Add button.

17. Once the operation is complete, you see your domain name in the list of custom domains with a status of Secured. Navigate to your domain to verify that it's accessible.

Note

For container apps in internal Container Apps environments, additional configuration is required to use custom domains with VNET-scope ingress.

Managing certificates

You can manage certificates via the Container Apps environment or through an individual container app.

Environment

The Certificates window of the Container Apps environment presents a table of all the certificates associated with the environment.

You can manage your certificates through the following actions:

Action	Description
Add	Select the Add certificate link to add a new certificate.
Delete	Select the trash can icon to remove a certificate.
Renew	The Health status field of the table indicates that a certificate is expiring soon within 60 days of the expiration date. To renew a certificate, select the Renew certificate link to upload a new certificate.

Container app

The Custom domains window of the container app presents a list of custom domains associated with the container app.

You can manage your certificates for an individual domain name by selecting the ellipsis (...) button, which opens the certificate binding window. From the following window, you can select a certificate to bind to the selected domain name.

Next steps

Authentication in Azure Container Apps