Modify /etc/hosts file to add record to shadow an external url to point to a kubernetes service
- HOSTS_FILE (default: /etc/hosts)
- HOSTS_FILE_BACKUP (default: /etc/hosts.backup)
- LOCK_FILE (default: /var/lock/mirror-hostess)
- SERVICE_NAME (default: registry-mirror)
- SERVICE_NAMESPACE (default: default)
- SHADOW_FQDN (default: registry.example.com)