The linkage is the name of the units, in this case 'example-socket'. It can be overridden, but it is the default.

UPDATE: note that a wrong file name is given by chatGPT - 'example-server@.service' should be 'example-socket@.service'

In reply to Re^2: Systemd socket activated service in perl by tybalt89
in thread Systemd socket activated service in perl by chrestomanci

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