Arvados

Presumably when deploying a multi node cluster in AWS with Route53 and LetsEncrypt, there're related credentials that get stashed in /root/.aws/ so that the installer can use DNS based auth to request TLS certs.
When this happens, the dispatcher service cannot launch new compute nodes, probably because of the recent change in AWS SDK version that we're using in Golang code.
When these credentials are removed and a-d-c restarted, everything goes back to normal.

See https://docs.aws.amazon.com/sdkref/latest/guide/settings-reference.html#EVarSettings for potential options to try.