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`INSTANCE_PREFIX` environment variable is being overwritten by `KUBE_AWS_INSTANCE_PREFIX` environment variable or defaulting to `kubernetes`, see https://github.com/kubernetes/kubernetes/blob/59628744141bb6debd4ac042882ffa6855d846ce/cluster/aws/config-default.sh#L66 ```bash INSTANCE_PREFIX="${KUBE_AWS_INSTANCE_PREFIX:-kubernetes}" ```