Errors Middleware & ExternalName Service

Traefik Traefik v3 (latest)
1

Just completed an upgrade to v3 in our k8s test cluster and seeing an error message in the pod logs:

ERR Error while reading error page middleware error="externalName services not allowed..."

We have an error middleware which points to an ExternalName service that uses S3 to serve up error pages. This configuration seems to work, even after the v3 migration, so I'm unclear why this error is logged. Is this expected?

There are no errors shown in the traefik dashboard, just in the logs. Is this configuration unsupported?

2

Oops, was missing "allowExternalNameServices: true" in one of our instances. Added this to the values.yaml:

providers:
  kubernetesCRD:
    ingressClass: traefik-external
    allowExternalNameServices: true