quay.io in registries.conf can yield misleading errors #301
Description
The current containers registries.conf (installed as /etc/containers/registries.conf.d/crio.conf) leads in combination with the docker hub rate-limit to hard to interpret error messages.
The content of the configuration:
unqualified-search-registries = ["docker.io", "quay.io"]will for example resolve an image debian:stable first to docker.io/debian:stable (which then again gets normalized to docker.io/library/debian:stable by the containers libs) and second to quay.io/debian:stable which simply does not exist.
Therefore a fully qualified container image which can't be pulled due to the rate-limit will yield an error message giving hints about the actual cause to the operator:
Failed to pull image "docker.io/library/debian:stable": initializing source
docker://debian:stable: reading manifest stable in docker.io/library/debian:
toomanyrequests: You have reached your unauthenticated pull rate limit.
https://www.docker.com/increase-rate-limit
With an unqualified container image the error message can be quite misleading:
Failed to pull image "debian:stable": initializing source
docker://quay.io/debian:stable: reading manifest stable in quay.io/debian:
StatusCode: 404, "<!doctype html>\n<html lang=en>\n<title>404 Not Foun..."