the service definition uses the format as defined in http://man7.org/linux/man-pages/man5/hosts.5.html (IP_address canonical_hostname [aliases...]) This format is the _reverse_ of the format used in the container API. Commit f32869d956eb175f88fd0b16992d2377d8eae79c inadvertently used the incorrect order. This fixes the order, and correctly sets it to; IP-Address hostname Signed-off-by: Sebastiaan van Stijn <github@gone.nl>