systemd.socket

Socket units automatically gain a Before= dependency on sockets.target. Socket units automatically gain a pair of After= and Requires= dependency on sysinit.target, and a pair of Before= and Conflicts= dependencies on shutdown.target. These dependencies ensure that the socket unit is started before normal services at boot, and is stopped on shutdown. Only sockets involved with early boot or late s

[iww]

『If the address string is a single number, it is read as port number to listen on via IPv6.』 やっぱそうなのか。 もっとでっかく書いといてくれよ