Usage cache on MP+

[mfocko]

Usage cache doesn't work on MP+. Suspected reason is preconfigured Hairpin NAT on the auto-prod cluster.

• Trying to access Packit Service API on MP+ yields:

  sh-5.1$ curl -vLk https://stg.packit.dev/api/system
  *   Trying 34.235.66.59:443...
  * Connected to stg.packit.dev (34.235.66.59) port 443 (#0)
  …
  

  API URL resolves to the public IP and hangs

• Trying to access API on auto-prod OTOH yields:

  sh-5.1$ curl -vLk https://prod.packit.dev/api/system
  *   Trying 52.31.82.208:443...
  * Connected to prod.packit.dev (52.31.82.208) port 443 (#0)
  …
  

  API URL again resolves to the public IP, but it doesn't hang.

Trying to use deployment name for DNS results in 403, since we have HTTPD configured to required FQDN.

TODO:

• Ideally configure the httpd to accept packit-service too apart from the FQDN {deployment}.packit.dev

• Adjust the API URL on dashboard

  WARNING
  Only in the API part of the dashboard, don't touch frontend, that's resolved client-side (is not affected by this issue and would break with these changes)

[mfocko]

Fixed in packit/packit-service#2282, packit/packit-service#2283 and packit/packit-service#2284