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DNS

DNS for subdomains pointed at the GOV.UK PaaS is configured in AWS Route 53. The subdomain is then added via the Cloud Foundry CLI to set it up as an endpoint for the automatically configured CloudFront instance and route it to the relevant app.

Add new subdomain

To add a new subdomain:

  1. Using the Cloud Foundry CLI, log in and choose the relevant space
  2. Run cf service opss-cdn-route - this will return information about the service including a section named "Showing status of last operation" that has a list of already-configured subdomains for the current environment
  3. Run cf update-service opss-cdn-route -c '{"domain": "<domains>", "headers": ["Accept", "Authorization", "Referer", "Host", "User-Agent"]}' where <domains> is a comma-separated list of the domains from the previous step plus the new subdomain you want to add
  4. Run cf service opss-cdn-route again - the "Showing status of last operation" section will now detail the records that are required for the new subdomain - one to point to CloudFront and one for TLS validation
  5. Go to AWS Route 53, select the relevant hosted zone, then add the two CNAME records as detailed in the previous step
  6. Within a few minutes, CloudFoundry will detect the new records, add the subdomain to the CloudFront distribution and provision the TLS certificate