backend_service CDN policy not applying negative_caching and serve_while_stale

[jeremypick-sky]

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request.
• Please do not leave +1 or me too comments, they generate extra noise for issue followers and do not help prioritize the request.
• If you are interested in working on this issue or have submitted a pull request, please leave a comment.
• If an issue is assigned to the modular-magician user, it is either in the process of being autogenerated, or is planned to be autogenerated soon. If an issue is assigned to a user, that user is claiming responsibility for the issue. If an issue is assigned to hashibot, a community member has claimed the issue already.

Terraform Version

Affected Resource(s)

• google_compute_backend_service

Terraform Configuration Files

resource "google_compute_backend_service" "backend-service" {
  provider       = google-beta
  name          = "${var.backend_name}-backend-service"
  enable_cdn    = var.use_cloud_cdn
  cdn_policy {
    cache_mode = "USE_ORIGIN_HEADERS"
    negative_caching = false
    serve_while_stale = 0
    cache_key_policy {
      include_host           = true
      include_protocol       = true
      include_query_string   = true
      query_string_blacklist = []
      query_string_whitelist = []
    }
  }
  health_checks = [google_compute_http_health_check.backend-healthcheck-stats.self_link]
  security_policy = google_compute_security_policy.sds-cloud-armor.self_link
  backend {
    group = google_compute_instance_group.backend-instance-group.self_link
  }
  log_config {
    enable = "true"
    sample_rate = "1.0"
  }
}

Debug Output

https://gist.github.com/jeremypick-sky/d8df738810f7f4e1712108abd51dd0ba

Panic Output

Expected Behavior

Cloud CDN should be provisioned with "Enable Negative Caching" turned off and "Serve While Stale" disabled

Actual Behavior

Cloud CDN provisioned with "Enable Negative Caching" turned on and "Serve While Stale" set to 1 day

Steps to Reproduce

1. terraform apply
2. terraform plan

Output will show

      ~ cdn_policy {
            cache_mode                   = "USE_ORIGIN_HEADERS"
            client_ttl                   = 0
            default_ttl                  = 0
            max_ttl                      = 0
          ~ negative_caching             = true -> false
          ~ serve_while_stale            = 86400 -> 0
            signed_url_cache_max_age_sec = 3600

            cache_key_policy {
                include_host           = true
                include_protocol       = true
                include_query_string   = true
                query_string_blacklist = []
                query_string_whitelist = []
            }
        }

Important Factoids

References

• #0000

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.