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Last updated: 13 Sep 2023

govuk-infrastructure: Content Delivery Network (CDN) - Fastly

GOV.UK uses Fastly as its Content Delivery Network (CDN).

Setting-up

To setup Fastly, log into the Fastly web management portal.

TLS certificate

  1. Choose a domain that users will use to reach your GOV.UK environment, e.g. the GOV.UK EKS platform uses domain with format www.eks.<environment>.govuk.digital
  2. Create a Fastly/letsencrypt TLS certificate for your chosen domain and attach it to the "govuk" TLS configuration. Further details are available here
  3. You will be asked to create a CNAME to point to a specific given address, you should use this address as the value of the variable www_dns_validation_rdata in the commons.yaml file of the environment you are deploying, e.g. for integration it is located here

CDN service

  1. In the Fastly portal, create a new CDN service, e.g. <environment> GOV.UK EKS. You should use the same domain that you have chosen above. Make a note of the new service ID.
  2. Create a pull request in the GitHub repo with a new service under www-eks. You can use this previous pull request as example.
  3. See how to deploy Fastly.